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HomeMy WebLinkAboutWPO201500055 Calculations WPO VSMP 2017-12-12 BRANCHLANDS MEMORY CARE & ASSISTED LIVING COUNTY OF ALBEMARLE, VIRGINIA VSMP AMENDMENT DESIGN CALCULATIONS & NARRATIVE DECEMBER 12, 2017 • • TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Craig Kotarski, PE Timmons Group 608 Preston Ave STE 200 Charlottesville, VA 22903 434.327.1688 t��yY -Tripp 0 U CRAIG W 1.KO FARSKI 5 Lic.No.0402048507 is/la/17 4(Y APPROVED s1ONAL by the Ale arie County Community Devflopmerst Department Date 111.a0 __e_.__._ Fileot_���._r_� Table of Contents Section Title 1 Project Narrative 2 Stormwater Quantity Calculations 3 Pre-Developed HydroCAD Calculations 4 Post-Developed HydroCAD Calculations Project Narrative: This project includes the construction of an assisted living facility and associated site work. Limits of disturbance are 1.36 acres. Water Quantity (Original Narrative): The site consists of two drainage areas, one to the south and one to the west. Currently both areas enter a manmade storm sewer system, that discharges into an existing creek northwest of the site. This will be maintained in the post developed condition. However two underground storage systems are being installed to control the additional flow due to the increase in impervious area in the proposed condition. The post developed 2 year and 10 year flows are being reduced to be equal or less than the current 2 and 10 year flows. The drainage area of the existing creek upstream of this project it 768 acres, therefore channel and flood protection are adequate. Proposed Amendments: During the construction process the architect has directed the contractor to add additional downspouts to the west building elevation. These downs spouts are piped directly to the new proposed storm system on that side of the site. The addition of these downspouts has slightly changed the water quantity areas (Post Development) from the approved plans. While this has resulted in a slight increase of flow leaving the site, due to less area draining to the detention system, the plan is still in compliance with the general logic presented in the original approved plan. Stormwater Quantity Summary: Pre Developed Area to the South Area= 0.55 acres Q2 = 1.74cfs Qio= 3.22 cfs Qioo = 6.08cfs Pre Developed Area to the West Area= 1.17 acres Q2 = 1.86 cfs Qio=4.33 cfs Qtoo = 9.67cfs Post Developed Area to the South: Total Area=0.78 acres Q2=1.45 cfs Qio =3.01 cfs Qioo = 8.97cfs Post Developed Area to the West: Total Area= 0.94 acres Q2= 1.81 cfs Qio = 3.85 cfs Qioo = 8.91 cfs ( 2S ) Pre - Developed Are a to South Subcat on• Routing Diagram for Pre-South Prepared by Timmons Group, Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ®2015 HydroCAD Software Solutions LLC Pre-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.250 61 >75% Grass cover, Good, HSG B (2S) 0.300 98 Paved parking, HSG A (2S) 0.550 81 TOTAL AREA Pre-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.300 HSG A 2S 0.250 HSG B 2S 0.000 HSG C 0.000 HSG D 0.000 Other 0.550 TOTAL AREA Pre-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.250 0.000 0.000 0.000 0.250 >75% Grass cover, Good 2S 0.300 0.000 0.000 0.000 0.000 0.300 Paved parking 2S 0.300 0.250 0.000 0.000 0.000 0.550 TOTAL AREA Pre-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 5 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Pre- Developed Area to Runoff Area=0.550 ac 54.55% Impervious Runoff Depth>1.69" Tc=6.0 min CN=81 Runoff=1.74 cfs 0.078 of Total Runoff Area= 0.550 ac Runoff Volume=0.078 of Average Runoff Depth = 1.69" 45.45%Pervious=0.250 ac 54.55%Impervious=0.300 ac Pre-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 2S: Pre - Developed Area to South Runoff = 1.74 cfs @ 11.97 hrs, Volume= 0.078 af, Depth> 1.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.66" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.250 61 >75% Grass cover, Good, HSG B 0.550 81 Weighted Average 0.250 45.45% Pervious Area 0.300 54.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre - Developed Area to South Hydrograph 7 ■Runoff limas Type II 24-hr 2-Year Rainfall=3.66" Runoff Area=0.550 ac Runoff Volume=0.078 af Runoff Depth>1.69" LL Tc=6.0 min CN=81 0 , r.. . . . . . . . . . . . . ... . . „ , . . . . . .. . ._. . . , , . , 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 7 Hydrograph for Subcatchment 2S: Pre- Developed Area to South Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) lhours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 18.00 3.37 1.60 0.03 5.25 0.25 0.00 0.00 18.25 3.39 1.62 0.03 5.50 0.26 0.00 0.00 18.50 3.40 1.63 0.03 5.75 0.28 0.00 0.00 18.75 3.42 1.64 0.03 6.00 0.29 0.00 0.00 19.00 3.43 1.65 0.03 6.25 0.31 0.00 0.00 19.25 3.45 1.66 0.02 6.50 0.33 0.00 0.00 19.50 3.46 1.68 0.02 6.75 0.34 0.00 0.00 19.75 3.47 1.69 0.02 7.00 0.36 0.00 0.00 20.00 3.48 1.70 0.02 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.00 9.50 0.60 0.01 0.01 9.75 0.63 0.01 0.01 10.00 0.66 0.01 0.01 10.25 0.70 0.02 0.01 10.50 0.75 0.03 0.02 10.75 0.80 0.04 0.03 11.00 0.86 0.06 0.04 11.25 0.94 0.08 0.05 11.50 1.04 0.11 0.08 11.75 1.42 0.27 0.43 12.00 2.43 0.89 1.67 12.25 2.58 1.00 0.25 12.50 2.69 1.08 0.16 12.75 2.76 1.13 0.12 13.00 2.83 1.18 0.10 13.25 2.88 1.22 0.09 13.50 2.92 1.26 0.08 13.75 2.97 1.29 0.07 14.00 3.00 1.31 0.06 14.25 3.03 1.34 0.06 14.50 3.07 1.36 0.05 14.75 3.10 1.39 0.05 15.00 3.12 1.41 0.05 15.25 3.15 1.43 0.05 15.50 3.18 1.45 0.04 15.75 3.20 1.47 0.04 16.00 3.22 1.49 0.04 16.25 3.24 1.50 0.04 16.50 3.26 1.52 0.04 16.75 3.28 1.53 0.03 17.00 3.30 1.55 0.03 17.25 3.32 1.56 0.03 17.50 3.34 1.58 0.03 17.75 3.35 1.59 0.03 Pre-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 8 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Pre- Developed Area to Runoff Area=0.550 ac 54.55% Impervious Runoff Depth>3.22" Tc=6.0 min CN=81 Runoff=3.22 cfs 0.147 of Total Runoff Area=0.550 ac Runoff Volume=0.147 of Average Runoff Depth =3.22" 45.45% Pervious=0.250 ac 54.55%Impervious=0.300 ac Pre-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 2S: Pre - Developed Area to South Runoff = 3.22 cfs @ 11.97 hrs, Volume= 0.147 af, Depth> 3.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.53" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.250 61 >75% Grass cover, Good, HSG B 0.550 81 Weighted Average 0.250 45.45% Pervious Area 0.300 54.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre - Developed Area to South Hydrograph 7 ■Runoff 13.22 de I Type 1124-hr 3- 10-Year Rainfall=5.53" Runoff Area=0.550 ac Runoff Volume=0.147 af 2 Runoff Depth>3.22" Tc=6.0 min mnmiiniimmmir CN=81 0 , . . . . ,-, , . ._, . ,.- , , . , , , , . .- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 10 Hydrograph for Subcatchment 2S: Pre - Developed Area to South Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 18.00 5.09 3.07 0.05 5.25 0.37 0.00 0.00 18.25 5.12 3.09 0.05 5.50 0.39 0.00 0.00 18.50 5.14 3.11 0.05 5.75 0.42 0.00 0.00 18.75 5.16 3.13 0.04 6.00 0.44 0.00 0.00 19.00 5.19 3.15 0.04 6.25 0.47 0.00 0.00 19.25 5.21 3.17 0.04 6.50 0.49 0.00 0.00 19.50 5.23 3.19 0.04 6.75 0.52 0.00 0.00 19.75 5.25 3.20 0.04 7.00 0.55 0.00 0.00 20.00 5.26 3.22 0.04 7.25 0.58 0.00 0.00 7.50 0.60 0.01 0.01 7.75 0.63 0.01 0.01 8.00 0.66 0.01 0.01 8.25 0.70 0.02 0.01 8.50 0.73 0.03 0.01 8.75 0.77 0.03 0.02 9.00 0.81 0.04 0.02 9.25 0.86 0.06 0.03 9.50 0.90 0.07 0.03 9.75 0.95 0.08 0.03 10.00 1.00 0.10 0.04 10.25 1.06 0.12 0.05 10.50 1.13 0.14 0.06 10.75 1.21 0.18 0.07 11.00 1.30 0.22 0.09 11.25 1.42 0.27 0.13 11.50 1.56 0.35 0.18 11.75 2.14 0.70 0.92 12.00 3.67 1.84 3.04 12.25 3.90 2.04 0.43 12.50 4.06 2.18 0.28 12.75 4.18 2.27 0.21 13.00 4.27 2.35 0.17 13.25 4.35 2.42 0.15 13.50 4.42 2.48 0.13 13.75 4.48 2.53 0.12 14.00 4.53 2.58 0.10 14.25 4.58 2.62 0.10 14.50 4.63 2.66 0.09 14.75 4.68 2.70 0.09 15.00 4.72 2.74 0.08 15.25 4.76 2.77 0.08 15.50 4.80 2.81 0.07 15.75 4.83 2.84 0.07 16.00 4.87 2.87 0.06 16.25 4.90 2.90 0.06 16.50 4.93 2.92 0.06 16.75 4.96 2.95 0.06 17.00 4.99 2.97 0.06 17.25 5.01 3.00 0.05 17.50 5.04 3.02 0.05 17.75 5.07 3.05 0.05 Pre-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 11 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Pre- Developed Area to Runoff Area=0.550 ac 54.55% Impervious Runoff Depth>6.34" Tc=6.0 min CN=81 Runoff=6.08 cfs 0.291 af Total Runoff Area= 0.550 ac Runoff Volume=0.291 af Average Runoff Depth =6.34" 45.45% Pervious=0.250 ac 54.55%Impervious=0.300 ac Pre-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 2S: Pre - Developed Area to South Runoff = 6.08 cfs @ 11.97 hrs, Volume= 0.291 af, Depth> 6.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=9.08" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.250 61 >75% Grass cover, Good, HSG B 0.550 81 Weighted Average 0.250 45.45% Pervious Area 0.300 54.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre - Developed Area to South Hydrograph •Runoff 16.0ea+,t 6- Type II 24-hr 100-Year Rainfall=9.08" 5-Runoff Area=0.550 ac 4- Runoff Volume=0.291 af Runoff Depth>6.34" tr. 3- Tc=6.0 min CN=81 2- 1- 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 13 Hydrograph for Subcatchment 2S: Pre- Developed Area to South Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.57 0.00 0.01 18.00 8.36 6.09 0.09 5.25 0.61 0.01 0.01 18.25 8.40 6.12 0.08 5.50 0.65 0.01 0.01 18.50 8.44 6.16 0.08 5.75 0.69 0.02 0.01 18.75 8.48 6.20 0.08 6.00 0.73 0.03 0.02 19.00 8.51 6.23 0.08 6.25 0.77 0.03 0.02 19.25 8.55 6.26 0.07 6.50 0.81 0.04 0.02 19.50 8.58 6.29 0.07 6.75 0.85 0.05 0.02 19.75 8.61 6.32 0.07 7.00 0.90 0.07 0.03 20.00 8.64 6.35 0.06 7.25 0.94 0.08 0.03 7.50 0.99 0.10 0.03 7.75 1.04 0.11 0.04 8.00 1.09 0.13 0.04 8.25 1.14 0.15 0.05 8.50 1.20 0.17 0.05 8.75 1.26 0.20 0.06 9.00 1.33 0.23 0.07 9.25 1.41 0.27 0.08 9.50 1.48 0.30 0.08 9.75 1.56 0.34 0.09 10.00 1.64 0.39 0.11 10.25 1.74 0.45 0.13 10.50 1.85 0.51 0.15 10.75 1.98 0.59 0.18 11.00 2.13 0.69 0.22 11.25 2.32 0.82 0.30 11.50 2.57 0.99 0.40 11.75 3.51 1.72 1.92 12.00 6.02 3.90 5.69 12.25 6.41 4.26 0.78 12.50 6.67 4.50 0.50 12.75 6.86 4.67 0.37 13.00 7.01 4.81 0.31 13.25 7.14 4.94 0.27 13.50 7.25 5.04 0.23 13.75 7.36 5.14 0.21 14.00 7.45 5.22 0.18 14.25 7.53 5.30 0.17 14.50 7.61 5.37 0.16 14.75 7.68 5.44 0.15 15.00 7.75 5.51 0.15 15.25 7.82 5.57 0.14 15.50 7.88 5.63 0.13 15.75 7.94 5.68 0.12 16.00 7.99 5.73 0.11 16.25 8.04 5.78 0.11 16.50 8.09 5.83 0.10 16.75 8.14 5.88 0.10 17.00 8.19 5.92 0.10 17.25 8.23 5.96 0.10 17.50 8.28 6.01 0.09 17.75 8.32 6.05 0.09 K2S ) Pre - Developed Area to South <Subca) on. Link Routing Diagram for Pre-South Prepared by Timmons Group, Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 C 2015 HydroCAD Software Solutions LLC Pre-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.250 61 >75% Grass cover, Good, HSG B (2S) 0.300 98 Paved parking, HSG A (2S) 0.550 81 TOTAL AREA Pre-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.300 HSG A 2S 0.250 HSG B 2S 0.000 HSG C 0.000 HSG D 0.000 Other 0.550 TOTAL AREA Pre-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.250 0.000 0.000 0.000 0.250 >75% Grass cover, Good 2S 0.300 0.000 0.000 0.000 0.000 0.300 Paved parking 2S 0.300 0.250 0.000 0.000 0.000 0.550 TOTAL AREA Pre-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Pape 5 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Pre- Developed Area to Runoff Area=0.550 ac 54.55% Impervious Runoff Depth>1.69" Tc=6.0 min CN=81 Runoff=1.74 cfs 0.078 of Total Runoff Area=0.550 ac Runoff Volume=0.078 of Average Runoff Depth = 1.69" 45.45% Pervious= 0.250 ac 54.55%Impervious=0.300 ac Pre-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 2S: Pre - Developed Area to South Runoff = 1.74 cfs @ 11.97 hrs, Volume= 0.078 af, Depth> 1.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.66" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.250 61 >75% Grass cover, Good, HSG B 0.550 81 Weighted Average 0.250 45.45% Pervious Area 0.300 54.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre - Developed Area to South Hydrograph ■Runoff ►1.»ds l Type II 24-hr 2-Year Rainfall=3.66" Runoff Area=0.550 ac Runoff Volume=0.078 af w Runoff Depth>1.69" g Tc=6.0 min CN=81 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 7 Hydrograph for Subcatchment 2S: Pre- Developed Area to South Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 18.00 3.37 1.60 0.03 5.25 0.25 0.00 0.00 18.25 3.39 1.62 0.03 5.50 0.26 0.00 0.00 18.50 3.40 1.63 0.03 5.75 0.28 0.00 0.00 18.75 3.42 1.64 0.03 6.00 0.29 0.00 0.00 19.00 3.43 1.65 0.03 6.25 0.31 0.00 0.00 19.25 3.45 1.66 0.02 6.50 0.33 0.00 0.00 19.50 3.46 1.68 0.02 6.75 0.34 0.00 0.00 19.75 3.47 1.69 0.02 7.00 0.36 0.00 0.00 20.00 3.48 1.70 0.02 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.00 9.50 0.60 0.01 0.01 9.75 0.63 0.01 0.01 10.00 0.66 0.01 0.01 10.25 0.70 0.02 0.01 10.50 0.75 0.03 0.02 10.75 0.80 0.04 0.03 11.00 0.86 0.06 0.04 11.25 0.94 0.08 0.05 11.50 1.04 0.11 0.08 11.75 1.42 0.27 0.43 12.00 2.43 0.89 1.67 12.25 2.58 1.00 0.25 12.50 2.69 1.08 0.16 12.75 2.76 1.13 0.12 13.00 2.83 1.18 0.10 13.25 2.88 1.22 0.09 13.50 2.92 1.26 0.08 13.75 2.97 1.29 0.07 14.00 3.00 1.31 0.06 14.25 3.03 1.34 0.06 14.50 3.07 1.36 0.05 14.75 3.10 1.39 0.05 15.00 3.12 1.41 0.05 15.25 3.15 1.43 0.05 15.50 3.18 1.45 0.04 15.75 3.20 1.47 0.04 16.00 3.22 1.49 0.04 16.25 3.24 1.50 0.04 16.50 3.26 1.52 0.04 16.75 3.28 1.53 0.03 17.00 3.30 1.55 0.03 17.25 3.32 1.56 0.03 17.50 3.34 1.58 0.03 17.75 3.35 1.59 0.03 Pre-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 8 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Pre- Developed Area to Runoff Area=0.550 ac 54.55% Impervious Runoff Depth>3.22" Tc=6.0 min CN=81 Runoff=3.22 cfs 0.147 of Total Runoff Area=0.550 ac Runoff Volume=0.147 of Average Runoff Depth =3.22" 45.45%Pervious=0.250 ac 54.55%Impervious=0.300 ac Pre-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 2S: Pre - Developed Area to South Runoff = 3.22 cfs @ 11.97 hrs, Volume= 0.147 af, Depth> 3.22" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.53" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.250 61 >75% Grass cover, Good, HSG B 0.550 81 Weighted Average 0.250 45.45% Pervious Area 0.300 54.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre - Developed Area to South Hydrograph ■Runoff 1 3.22 cfs i 3- L10-Year r _444.......i' 10-Year Rainfall=5.53" Runoff Area=0.550 ac Runoff Volume=0.147 of 2J Runoff Depth>3.22" LL • Tc=6.0 min CN=81 1 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 10 Hydrograph for Subcatchment 2S: Pre - Developed Area to South Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 18.00 5.09 3.07 0.05 5.25 0.37 0.00 0.00 18.25 5.12 3.09 0.05 5.50 0.39 0.00 0.00 18.50 5.14 3.11 0.05 5.75 0.42 0.00 0.00 18.75 5.16 3.13 0.04 6.00 0.44 0.00 0.00 19.00 5.19 3.15 0.04 6.25 0.47 0.00 0.00 19.25 5.21 3.17 0.04 6.50 0.49 0.00 0.00 19.50 5.23 3.19 0.04 6.75 0.52 0.00 0.00 19.75 5.25 3.20 0.04 7.00 0.55 0.00 0.00 20.00 5.26 3.22 0.04 7.25 0.58 0.00 0.00 7.50 0.60 0.01 0.01 7.75 0.63 0.01 0.01 8.00 0.66 0.01 0.01 8.25 0.70 0.02 0.01 8.50 0.73 0.03 0.01 8.75 0.77 0.03 0.02 9.00 0.81 0.04 0.02 9.25 0.86 0.06 0.03 9.50 0.90 0.07 0.03 9.75 0.95 0.08 0.03 10.00 1.00 0.10 0.04 10.25 1.06 0.12 0.05 10.50 1.13 0.14 0.06 10.75 1.21 0.18 0.07 11.00 1.30 0.22 0.09 11.25 1.42 0.27 0.13 11.50 1.56 0.35 0.18 11.75 2.14 0.70 0.92 12.00 3.67 1.84 3.04 12.25 3.90 2.04 0.43 12.50 4.06 2.18 0.28 12.75 4.18 2.27 0.21 13.00 4.27 2.35 0.17 13.25 4.35 2.42 0.15 13.50 4.42 2.48 0.13 13.75 4.48 2.53 0.12 14.00 4.53 2.58 0.10 14.25 4.58 2.62 0.10 14.50 4.63 2.66 0.09 14.75 4.68 2.70 0.09 15.00 4.72 2.74 0.08 15.25 4.76 2.77 0.08 15.50 4.80 2.81 0.07 15.75 4.83 2.84 0.07 16.00 4.87 2.87 0.06 16.25 4.90 2.90 0.06 16.50 4.93 2.92 0.06 16.75 4.96 2.95 0.06 17.00 4.99 2.97 0.06 17.25 5.01 3.00 0.05 17.50 5.04 3.02 0.05 17.75 5.07 3.05 0.05 Pre-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Pape 11 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 2S: Pre-Developed Area to Runoff Area=0.550 ac 54.55% Impervious Runoff Depth>6.34" Tc=6.0 min CN=81 Runoff=6.08 cfs 0.291 af Total Runoff Area=0.550 ac Runoff Volume=0.291 af Average Runoff Depth =6.34" 45.45%Pervious=0.250 ac 54.55%Impervious=0.300 ac Pre-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 2S: Pre - Developed Area to South Runoff = 6.08 cfs @ 11.97 hrs, Volume= 0.291 af, Depth> 6.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=9.08" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.250 61 >75% Grass cover, Good, HSG B 0.550 81 Weighted Average 0.250 45.45% Pervious Area 0.300 54.55% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre - Developed Area to South Hydrograph ■Runoff !C.ae as 6- Type II 24-hr 100-Year Rainfall=9.08" Runoff Area=0.550 ac 4- Runoff Volume=0.291 af Runoff Depth>6.34" LL 3- Tc=6.0 min CN=81 2- 1- 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18„ 19 20 Time (hours) Pre-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 13 Hydrograph for Subcatchment 2S: Pre - Developed Area to South Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.57 0.00 0.01 18.00 8.36 6.09 0.09 5.25 0.61 0.01 0.01 18.25 8.40 6.12 0.08 5.50 0.65 0.01 0.01 18.50 8.44 6.16 0.08 5.75 0.69 0.02 0.01 18.75 8.48 6.20 0.08 6.00 0.73 0.03 0.02 19.00 8.51 6.23 0.08 6.25 0.77 0.03 0.02 19.25 8.55 6.26 0.07 6.50 0.81 0.04 0.02 19.50 8.58 6.29 0.07 6.75 0.85 0.05 0.02 19.75 8.61 6.32 0.07 7.00 0.90 0.07 0.03 20.00 8.64 6.35 0.06 7.25 0.94 0.08 0.03 7.50 0.99 0.10 0.03 7.75 1.04 0.11 0.04 8.00 1.09 0.13 0.04 8.25 1.14 0.15 0.05 8.50 1.20 0.17 0.05 8.75 1.26 0.20 0.06 9.00 1.33 0.23 0.07 9.25 1.41 0.27 0.08 9.50 1.48 0.30 0.08 9.75 1.56 0.34 0.09 10.00 1.64 0.39 0.11 10.25 1.74 0.45 0.13 10.50 1.85 0.51 0.15 10.75 1.98 0.59 0.18 11.00 2.13 0.69 0.22 11.25 2.32 0.82 0.30 11.50 2.57 0.99 0.40 11.75 3.51 1.72 1.92 12.00 6.02 3.90 5.69 12.25 6.41 4.26 0.78 12.50 6.67 4.50 0.50 12.75 6.86 4.67 0.37 13.00 7.01 4.81 0.31 13.25 7.14 4.94 0.27 13.50 7.25 5.04 0.23 13.75 7.36 5.14 0.21 14.00 7.45 5.22 0.18 14.25 7.53 5.30 0.17 14.50 7.61 5.37 0.16 14.75 7.68 5.44 0.15 15.00 7.75 5.51 0.15 15.25 7.82 5.57 0.14 15.50 7.88 5.63 0.13 15.75 7.94 5.68 0.12 16.00 7.99 5.73 0.11 16.25 8.04 5.78 0.11 16.50 8.09 5.83 0.10 16.75 8.14 5.88 0.10 17.00 8.19 5.92 0.10 17.25 8.23 5.96 0.10 17.50 8.28 6.01 0.09 17.75 8.32 6.05 0.09 Pre - Developed Are a to the West Subcat Reach -on• Routing Diagram for Pre-West Prepared by Timmons Group, Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ®2015 HydroCAD Software Solutions LLC Pre-West Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.520 61 >75% Grass cover, Good, HSG B (1S) 0.300 98 Paved parking, HSG A (1S) 0.350 55 Woods, Good, HSG B (1S) 1.170 69 TOTAL AREA Pre-West Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Pale 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.300 HSG A 1S 0.870 HSG B 1S 0.000 HSG C 0.000 HSG D 0.000 Other 1.170 TOTAL AREA Pre-West Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.520 0.000 0.000 0.000 0.520 >75% Grass cover, Good 1S 0.300 0.000 0.000 0.000 0.000 0.300 Paved parking 1S 0.000 0.350 0.000 0.000 0.000 0.350 Woods, Good 1S 0.300 0.870 0.000 0.000 0.000 1.170 TOTAL AREA Pre-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 5 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Pre- Developed Area to Runoff Area=1.170 ac 25.64% Impervious Runoff Depth>0.94" Flow Length=238' Tc=9.0 min CN=69 Runoff=1.86 cfs 0.092 af Total Runoff Area= 1.170 ac Runoff Volume=0.092 af Average Runoff Depth =0.94" 74.36% Pervious = 0.870 ac 25.64%Impervious=0.300 ac Pre-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 6 Summary for Subcatchment 1S: Pre - Developed Area to the West Runoff = 1.86 cfs @ 12.01 hrs, Volume= 0.092 af, Depth> 0.94" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.66" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.520 61 >75% Grass cover, Good, HSG B 0.350 55 Woods, Good, HSG B 1.170 69 Weighted Average 0.870 74.36% Pervious Area 0.300 25.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.2 78 0.0830 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 3.66" 2.8 160 0.0180 0.94 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.0 238 Total Subcatchment 1S: Pre - Developed Area to the West Hydrograph z 2 ■Runoff I186asj Type II 24-hr 2-Year Rainfall=3.66" Runoff Area=1.170 ac Runoff Volume=0.092 af Runoff Depth>0.94" 1- o Flow Length=238' Tc=9.0 m i n CN=69 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 7 Hydrograph for Subcatchment 1S: Pre- Developed Area to the West Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.23 0.00 0.00 18.00 3.37 0.88 0.05 5.25 0.25 0.00 0.00 18.25 3.39 0.89 0.04 5.50 0.26 0.00 0.00 18.50 3.40 0.90 0.04 5.75 0.28 0.00 0.00 18.75 3.42 0.91 0.04 6.00 0.29 0.00 0.00 19.00 3.43 0.91 0.04 6.25 0.31 0.00 0.00 19.25 3.45 0.92 0.04 6.50 0.33 0.00 0.00 19.50 3.46 0.93 0.04 6.75 0.34 0.00 0.00 19.75 3.47 0.94 0.04 7.00 0.36 0.00 0.00 20.00 3.48 0.94 0.03 7.25 0.38 0.00 0.00 7.50 0.40 0.00 0.00 7.75 0.42 0.00 0.00 8.00 0.44 0.00 0.00 8.25 0.46 0.00 0.00 8.50 0.48 0.00 0.00 8.75 0.51 0.00 0.00 9.00 0.54 0.00 0.00 9.25 0.57 0.00 0.00 9.50 0.60 0.00 0.00 9.75 0.63 0.00 0.00 10.00 0.66 0.00 0.00 10.25 0.70 0.00 0.00 10.50 0.75 0.00 0.00 10.75 0.80 0.00 0.00 11.00 0.86 0.00 0.00 11.25 0.94 0.00 0.00 11.50 1.04 0.00 0.02 11.75 1.42 0.05 0.20 12.00 2.43 0.39 1.84 12.25 2.58 0.46 0.42 12.50 2.69 0.51 0.25 12.75 2.76 0.55 0.17 13.00 2.83 0.58 0.15 13.25 2.88 0.61 0.13 13.50 2.92 0.63 0.11 13.75 2.97 0.65 0.10 14.00 3.00 0.67 0.09 14.25 3.03 0.69 0.08 14.50 3.07 0.71 0.08 14.75 3.10 0.72 0.08 15.00 3.12 0.74 0.07 15.25 3.15 0.75 0.07 15.50 3.18 0.77 0.07 15.75 3.20 0.78 0.06 16.00 3.22 0.79 0.06 16.25 3.24 0.80 0.06 16.50 3.26 0.81 0.05 16.75 3.28 0.83 0.05 17.00 3.30 0.84 0.05 17.25 3.32 0.85 0.05 17.50 3.34 0.86 0.05 17.75 3.35 0.87 0.05 Pre-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 8 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Pre- Developed Area to Runoff Area=1.170 ac 25.64% Impervious Runoff Depth>2.15" Flow Length=238' Tc=9.0 min CN=69 Runoff=4.33 cfs 0.209 af Total Runoff Area= 1.170 ac Runoff Volume=0.209 af Average Runoff Depth =2.15" 74.36%Pervious=0.870 ac 25.64%Impervious=0.300 ac Pre-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 1S: Pre - Developed Area to the West Runoff = 4.33 cfs @ 12.01 hrs, Volume= 0.209 af, Depth> 2.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.53" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.520 61 >75% Grass cover, Good, HSG B 0.350 55 Woods, Good, HSG B 1.170 69 Weighted Average 0.870 74.36% Pervious Area 0.300 25.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.2 78 0.0830 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 3.66" 2.8 160 0.0180 0.94 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.0 238 Total Subcatchment 1S: Pre - Developed Area to the West Hydrograph ■Runoff 14.33 d8 I 4: Type 1124-h r 10-Year Rainfall=5.53" Runoff Area=1.170 ac 3- Runoff Volume=0.209 af Runoff Depth>2.15" LL 2- Flow Length-=238' Tc=9.0 min CN=69 1- 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 10 Hydrograph for Subcatchment 1S: Pre- Developed Area to the West Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 18.00 5.09 2.03 0.09 5.25 0.37 0.00 0.00 18.25 5.12 2.04 0.08 5.50 0.39 0.00 0.00 18.50 5.14 2.06 0.08 5.75 0.42 0.00 0.00 18.75 5.16 2.08 0.08 6.00 0.44 0.00 0.00 19.00 5.19 2.09 0.08 6.25 0.47 0.00 0.00 19.25 5.21 2.11 0.07 6.50 0.49 0.00 0.00 19.50 5.23 2.12 0.07 6.75 0.52 0.00 0.00 19.75 5.25 2.14 0.07 7.00 0.55 0.00 0.00 20.00 5.26 2.15 0.06 7.25 0.58 0.00 0.00 7.50 0.60 0.00 0.00 7.75 0.63 0.00 0.00 8.00 0.66 0.00 0.00 8.25 0.70 0.00 0.00 8.50 0.73 0.00 0.00 8.75 0.77 0.00 0.00 9.00 0.81 0.00 0.00 9.25 0.86 0.00 0.00 9.50 0.90 0.00 0.00 9.75 0.95 0.00 0.00 10.00 1.00 0.00 0.01 10.25 1.06 0.01 0.02 10.50 1.13 0.01 0.03 10.75 1.21 0.02 0.04 11.00 1.30 0.03 0.06 11.25 1.42 0.05 0.09 11.50 1.56 0.09 0.15 11.75 2.14 0.27 0.77 12.00 3.67 1.06 4.31 12.25 3.90 1.21 0.88 12.50 4.06 1.31 0.50 12.75 4.18 1.38 0.35 13.00 4.27 1.44 0.30 13.25 4.35 1.50 0.26 13.50 4.42 1.55 0.23 13.75 4.48 1.59 0.20 14.00 4.53 1.63 0.18 14.25 4.58 1.66 0.16 14.50 4.63 1.69 0.16 14.75 4.68 1.73 0.15 15.00 4.72 1.76 0.14 15.25 4.76 1.78 0.14 15.50 4.80 1.81 0.13 15.75 4.83 1.84 0.12 16.00 4.87 1.86 0.11 16.25 4.90 1.88 0.11 16.50 4.93 1.91 0.10 16.75 4.96 1.93 0.10 17.00 4.99 1.95 0.10 17.25 5.01 1.97 0.10 17.50 5.04 1.99 0.09 17.75 5.07 2.01 0.09 Pre-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 11 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Pre- Developed Area to Runoff Area=1.170 ac 25.64% Impervious Runoff Depth>4.89" Flow Length=238' Tc=9.0 min CN=69 Runoff=9.67 cfs 0.477 af Total Runoff Area= 1.170 ac Runoff Volume=0.477 af Average Runoff Depth =4.89" 74.36%Pervious =0.870 ac 25.64%Impervious=0.300 ac Pre-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 1S: Pre - Developed Area to the West Runoff = 9.67 cfs @ 12.00 hrs, Volume= 0.477 af, Depth> 4.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=9.08" Area (ac) CN Description 0.300 98 Paved parking, HSG A 0.520 61 >75% Grass cover, Good, HSG B 0.350 55 Woods, Good, HSG B 1.170 69 Weighted Average 0.870 74.36% Pervious Area 0.300 25.64% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.2 78 0.0830 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 3.66" 2.8 160 0.0180 0.94 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 9.0 238 Total Subcatchment 1S: Pre - Developed Area to the West Hydrograph 10- ■Runoff (9.67 a.J 9- Type II 24-hr 100-Year Rainfall=9.08" 8- Runoff Area=1.170 ac 7- Runoff Volume=0.477 of 6-:, Runoff Depth>4.89" 5 Flow Length=238' 4H Tc=9.0 m i n 3- CN=69 2- 1- 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Pre-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 13 Hydrograph for Subcatchment 1S: Pre - Developed Area to the West Time Precip. Excess Runoff Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) hours) (inches) (inches) (cfs) 5.00 0.57 0.00 0.00 18.00 8.36 4.66 0.17 5.25 0.61 0.00 0.00 18.25 8.40 4.69 0.16 5.50 0.65 0.00 0.00 18.50 8.44 4.73 0.16 5.75 0.69 0.00 0.00 18.75 8.48 4.76 0.15 6.00 0.73 0.00 0.00 19.00 8.51 4.79 0.15 6.25 0.77 0.00 0.00 19.25 8.55 4.82 0.14 6.50 0.81 0.00 0.00 19.50 8.58 4.85 0.14 6.75 0.85 0.00 0.00 19.75 8.61 4.88 0.13 7.00 0.90 0.00 0.00 20.00 8.64 4.90 0.12 7.25 0.94 0.00 0.00 7.50 0.99 0.00 0.01 7.75 1.04 0.00 0.01 8.00 1.09 0.01 0.02 8.25 1.14 0.01 0.02 8.50 1.20 0.02 0.03 8.75 1.26 0.03 0.04 9.00 1.33 0.04 0.05 9.25 1.41 0.05 0.06 9.50 1.48 0.07 0.07 9.75 1.56 0.08 0.08 10.00 1.64 0.11 0.10 10.25 1.74 0.13 0.13 10.50 1.85 0.17 0.16 10.75 1.98 0.21 0.20 11.00 2.13 0.27 0.26 11.25 2.32 0.34 0.36 11.50 2.57 0.45 0.51 11.75 3.51 0.96 2.21 12.00 6.02 2.73 9.66 12.25 6.41 3.04 1.84 12.50 6.67 3.25 1.02 12.75 6.86 3.40 0.71 13.00 7.01 3.52 0.60 13.25 7.14 3.63 0.51 13.50 7.25 3.72 0.45 13.75 7.36 3.81 0.40 14.00 7.45 3.88 0.35 14.25 7.53 3.95 0.32 14.50 7.61 4.02 0.31 14.75 7.68 4.08 0.29 15.00 7.75 4.14 0.28 15.25 7.82 4.19 0.26 15.50 7.88 4.25 0.25 15.75 7.94 4.30 0.23 16.00 7.99 4.34 0.22 16.25 8.04 4.39 0.21 16.50 8.09 4.43 0.20 16.75 8.14 4.47 0.20 17.00 8.19 4.51 0.19 17.25 8.23 4.55 0.19 17.50 8.28 4.59 0.18 17.75 8.32 4.62 0.17 • Post-Devel4ped Area to S uth ,, , AP Pipe Storage South SubcBt ibili -on• Routing Diagram for Post-South Prepared by Timmons Group, Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Post-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.330 61 >75% Grass cover, Good, HSG B (1S) 0.450 98 Paved parking, HSG B (1S) 0.780 82 TOTAL AREA Post-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.780 HSG B 1S 0.000 HSG C 0.000 HSG D 0.000 Other 0.780 TOTAL AREA Post-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground acres (acres) (acres) (acres) Subcatchment (acres) (acres) (acres) Cover Numbers 0.000 0.330 0.000 0.000 0.000 0.330 >75% Grass cover, Good 1S 0.000 0.450 0.000 0.000 0.000 0.450 Paved parking 1S 0.000 0.780 0.000 0.000 0.000 0.780 TOTAL AREA Post-South Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 5 Pipe Listing (all nodes) Line# Node In-Invert Out-Invert Length Slope n Diam/Width Height Inside-Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 3P 431.50 431.00 50.0 0.0100 0.013 15.0 0.0 0.0 Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 6 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Post-Developed Area to Runoff Area=0.780 ac 57.69% Impervious Runoff Depth>1.91" Tc=6.0 min CN=82 Runoff=2.66 cfs 0.124 of Pond 3P: Pipe Storage South Peak Elev=433.49' Storage=0.021 af Inflow=2.66 cfs 0.124 af Outflow=1.45 cfs 0.124 af Total Runoff Area=0.780 ac Runoff Volume=0.124 af Average Runoff Depth = 1.91" 42.31%Pervious=0.330 ac 57.69%Impervious=0.450 ac Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 1S: Post-Developed Area to South Runoff = 2.66 cfs @ 11.97 hrs, Volume= 0.124 af, Depth> 1.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=3.66" Area (ac) CN Description 0.450 98 Paved parking, HSG B 0.330 61 >75% Grass cover, Good, HSG B 0.780 82 Weighted Average 0.330 42.31% Pervious Area 0.450 57.69% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post-Developed Area to South Hydrograph ■Runoff 1266d31 Type II 24-hr 2-Year Rainfall=3.66" 2_ Runoff Area=0.780 ac Runoff Volume=0.124 af Z - Runoff Depth>1.91" LL Tc=6.0 min CN=82 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15' 16 17 '181 19"20 ,21 22 23 24 Time (hours) Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 sin 06538 ©2015 HydroCAD Software Solutions LLC Page 8 Hydrograph for Subcatchment 1S: Post-Developed Area to South Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.10 0.00 0.00 3.00 0.13 0.00 0.00 3.50 0.15 0.00 0.00 4.00 0.18 0.00 0.00 4.50 0.20 0.00 0.00 5.00 0.23 0.00 0.00 5.50 0.26 0.00 0.00 6.00 0.29 0.00 0.00 6.50 0.33 0.00 0.00 7.00 0.36 0.00 0.00 7.50 0.40 0.00 0.00 8.00 0.44 0.00 0.00 8.50 0.48 0.00 0.00 9.00 0.54 0.00 0.01 9.50 0.60 0.01 0.01 10.00 0.66 0.02 0.02 10.50 0.75 0.04 0.03 11.00 0.86 0.07 0.06 11.50 1.04 0.13 0.12 12.00 2.43 0.94 2.50 12.50 2.69 1.14 0.23 13.00 2.83 1.24 0.15 13.50 2.92 1.32 0.11 14.00 3.00 1.38 0.09 14.50 3.07 1.43 0.08 15.00 3.12 1.48 0.07 15.50 3.18 1.52 0.06 16.00 3.22 1.55 0.05 16.50 3.26 1.59 0.05 17.00 3.30 1.62 0.05 17.50 3.34 1.65 0.05 18.00 3.37 1.68 0.04 18.50 3.40 1.70 0.04 19.00 3.43 1.73 0.04 19.50 3.46 1.75 0.03 20.00 3.48 1.77 0.03 20.50 3.51 1.79 0.03 21.00 3.53 1.81 0.03 21.50 3.55 1.83 0.03 22.00 3.58 1.85 0.03 22.50 3.60 1.86 0.03 23.00 3.62 1.88 0.03 23.50 3.64 1.90 0.03 24.00 3.66 1.92 0.03 Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 sin 06538 ©2015 HydroCAD Software Solutions LLC Pape 9 Summary for Pond 3P: Pipe Storage South Inflow Area = 0.780 ac, 57.69% Impervious, Inflow Depth > 1.91" for 2-Year event Inflow = 2.66 cfs @ 11.97 hrs, Volume= 0.124 of Outflow = 1.45 cfs @ 12.06 hrs, Volume= 0.124 af, Atten= 45%, Lag= 4.9 min Primary = 1.45 cfs @ 12.06 hrs, Volume= 0.124 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 433.49' @ 12.06 hrs Surf.Area= 0.014 ac Storage= 0.021 af Plug-Flow detention time= 6.3 min calculated for 0.124 af(100% of inflow) Center-of-Mass det. time= 5.2 min ( 831.0 -825.8 ) Volume Invert Avail.Storage Storage Description #1 431.50' 0.056 af 60.0" Round Pipe Storage L= 125.0' Device Routing Invert Outlet Devices #1 Primary 431.50' 15.0" Round Culvert L= 50.0' Ke= 0.500 Inlet/Outlet Invert= 431.50'/431.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 431.50' 6.5"Vert. Orifice/Grate C= 0.600 #3 Device 1 433.50' 6.0"Vert. Orifice/Grate C= 0.600 #4 Device 1 435.50' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 335.50 336.50 Width (feet) 4.00 4.00 Primary OutFlow Max=1.45 cfs @ 12.06 hrs HW=433.49' (Free Discharge) 4t-.=Culvert (Passes 1.45 cfs of 6.71 cfs potential flow) 2=Orific e/Grate (Orifice Controls 1.45 cfs @ 6.31 fps) --3=Orifice/Grate ( Controls 0.00 cfs) -,4=Custom Weir/Orifice ( Controls 0.00 cfs) Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Pam 10 Pond 3P: Pipe Storage South Hydrograph ■In I2.66ds I ■Prima Inflow Area=0.780 ac Peak EIev=433.49' 2- Storage=0.021 of N 1.45ds LL 1- 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 3P: Pipe Storage South Stage-Discharge ■Primary 436- i="0011111101111111111111 1111 111111 I 435- 0 434- O - W 433- 432- �wr0 0 1 2 3 4 5 6 7 8 9 10 11 12 Discharge (cfs) Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 11 Pond 3P: Pipe Storage South Stage-Area-Storage z ■Storage 436- 435-- z- - 36-435— 0 434- io m - w 433- 432- 11.1.111. 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.055 Storage(acre-feet) Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 12 Hydrograph for Pond 3P: Pipe Storage South Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 431.50 0.00 0.50 0.00 0.000 431.50 0.00 1.00 0.00 0.000 431.50 0.00 1.50 0.00 0.000 431.50 0.00 2.00 0.00 0.000 431.50 0.00 2.50 0.00 0.000 431.50 0.00 3.00 0.00 0.000 431.50 0.00 3.50 0.00 0.000 431.50 0.00 4.00 0.00 0.000 431.50 0.00 4.50 0.00 0.000 431.50 0.00 5.00 0.00 0.000 431.50 0.00 5.50 0.00 0.000 431.50 0.00 6.00 0.00 0.000 431.50 0.00 6.50 0.00 0.000 431.50 0.00 7.00 0.00 0.000 431.50 0.00 7.50 0.00 0.000 431.50 0.00 8.00 0.00 0.000 431.50 0.00 8.50 0.00 0.000 431.51 0.00 9.00 0.01 0.000 431.53 0.01 9.50 0.01 0.000 431.55 0.01 10.00 0.02 0.000 431.57 0.02 10.50 0.03 0.000 431.59 0.03 11.00 0.06 0.000 431.63 0.05 11.50 0.12 0.001 431.69 0.11 12.00 2.50 0.018 433.30 1.37 12.50 0.23 0.002 431.87 0.34 13.00 0.15 0.001 431.73 0.15 13.50 0.11 0.001 431.70 0.11 14.00 0.09 0.001 431.67 0.09 14.50 0.08 0.001 431.66 0.08 15.00 0.07 0.001 431.65 0.07 15.50 0.06 0.000 431.64 0.06 16.00 0.05 0.000 431.63 0.06 16.50 0.05 0.000 431.63 0.05 17.00 0.05 0.000 431.62 0.05 17.50 0.05 0.000 431.62 0.05 18.00 0.04 0.000 431.62 0.04 18.50 0.04 0.000 431.61 0.04 19.00 0.04 0.000 431.61 0.04 19.50 0.03 0.000 431.60 0.03 20.00 0.03 0.000 431.60 0.03 20.50 0.03 0.000 431.60 0.03 21.00 0.03 0.000 431.60 0.03 21.50 0.03 0.000 431.60 0.03 22.00 0.03 0.000 431.59 0.03 22.50 0.03 0.000 431.59 0.03 23.00 0.03 0.000 431.59 0.03 23.50 0.03 0.000 431.59 0.03 24.00 0.03 0.000 431.59 0.03 Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 13 Stage-Discharge for Pond 3P: Pipe Storage South Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) 431.50 0.00 434.10 2.25 431.55 0.01 434.15 2.31 431.60 0.03 434.20 2.36 431.65 0.07 434.25 2.42 431.70 0.12 434.30 2.47 431.75 0.18 434.35 2.51 431.80 0.24 434.40 2.56 431.85 0.32 434.45 2.61 431.90 0.39 434.50 2.65 431.95 0.47 434.55 2.70 432.00 0.54 434.60 2.74 432.05 0.59 434.65 2.78 432.10 0.64 434.70 2.82 432.15 0.68 434.75 2.86 432.20 0.73 434.80 2.90 432.25 0.77 434.85 2.94 432.30 0.81 434.90 2.98 432.35 0.84 434.95 3.01 432.40 0.88 435.00 3.05 432.45 0.91 435.05 3.09 432.50 0.95 435.10 3.12 432.55 0.98 435.15 3.16 432.60 1.01 435.20 3.19 432.65 1.04 435.25 3.23 432.70 1.07 435.30 3.26 432.75 1.10 435.35 3.29 432.80 1.13 435.40 3.33 432.85 1.15 435.45 3.36 432.90 1.18 435.50 3.39 432.95 1.20 435.55 3.57 433.00 1.23 435.60 3.87 433.05 1.25 435.65 4.25 433.10 1.28 435.70 4.69 433.15 1.30 435.75 5.19 433.20 1.33 435.80 5.73 433.25 1.35 435.85 6.32 433.30 1.37 435.90 6.95 433.35 1.39 435.95 7.63 433.40 1.42 436.00 8.33 433.45 1.44 436.05 9.07 433.50 1.46 436.10 9.85 433.55 1.49 436.15 10.65 433.60 1.53 436.20 11.49 433.65 1.59 436.25 12.00 433.70 1.65 436.30 12.07 433.75 1.73 436.35 12.15 433.80 1.81 436.40 12.22 433.85 1.90 436.45 12.29 433.90 1.98 436.50 12.36 433.95 2.06 434.00 2.13 434.05 2.19 Post-South Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 14 Stage-Area-Storage for Pond 3P: Pipe Storage South Elevation Storage Elevation Storage (feet) (acre-feet) (feet) (acre-feet) 431.50 0.000 434.10 0.030 431.55 0.000 434.15 0.030 431.60 0.000 434.20 0.031 431.65 0.000 434.25 0.032 431.70 0.001 434.30 0.032 431.75 0.001 434.35 0.033 431.80 0.001 434.40 0.034 431.85 0.002 434.45 0.035 431.90 0.002 434.50 0.035 431.95 0.003 434.55 0.036 432.00 0.003 434.60 0.037 432.05 0.003 434.65 0.037 432.10 0.004 434.70 0.038 432.15 0.004 434.75 0.039 432.20 0.005 434.80 0.039 432.25 0.005 434.85 0.040 432.30 0.006 434.90 0.041 432.35 0.006 434.95 0.041 432.40 0.007 435.00 0.042 432.45 0.007 435.05 0.043 432.50 0.008 435.10 0.043 432.55 0.009 435.15 0.044 432.60 0.009 435.20 0.045 432.65 0.010 435.25 0.045 432.70 0.010 435.30 0.046 432.75 0.011 435.35 0.047 432.80 0.012 435.40 0.047 432.85 0.012 435.45 0.048 432.90 0.013 435.50 0.048 432.95 0.014 435.55 0.049 433.00 0.014 435.60 0.049 433.05 0.015 435.65 0.050 433.10 0.016 435.70 0.051 433.15 0.016 435.75 0.051 433.20 0.017 435.80 0.052 433.25 0.018 435.85 0.052 433.30 0.018 435.90 0.053 433.35 0.019 435.95 0.053 433.40 0.020 436.00 0.053 433.45 0.020 436.05 0.054 433.50 0.021 436.10 0.054 433.55 0.022 436.15 0.055 433.60 0.022 436.20 0.055 433.65 0.023 436.25 0.055 433.70 0.024 436.30 0.056 433.75 0.025 436.35 0.056 433.80 0.025 436.40 0.056 433.85 0.026 436.45 0.056 433.90 0.027 436.50 0.056 433.95 0.027 434.00 0.028 434.05 0.029 Post-South Type II 24-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 15 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Post-Developed Area to Runoff Area=0.780 ac 57.69% Impervious Runoff Depth>3.55" Tc=6.0 min CN=82 Runoff=4.83 cfs 0.231 af Pond 3P: Pipe Storage South Peak Elev=434.94' Storage=0.041 af Inflow=4.83 cfs 0.231 af Outflow=3.01 cfs 0.231 af Total Runoff Area=0.780 ac Runoff Volume=0.231 af Average Runoff Depth =3.55" 42.31% Pervious=0.330 ac 57.69%Impervious=0.450 ac Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 1S: Post-Developed Area to South Runoff = 4.83 cfs @ 11.97 hrs, Volume= 0.231 af, Depth> 3.55" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=5.53" Area (ac) CN Description 0.450 98 Paved parking, HSG B 0.330 61 >75% Grass cover, Good, HSG B 0.780 82 Weighted Average 0.330 42.31% Pervious Area 0.450 57.69% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post-Developed Area to South Hydrograph 7 ■Runoff 5- 14.83cts I Type II 24-hr 10-Year Rainfall=5.53" 4- Runoff Area=0.780 ac Runoff Volume=0.231 of x 3 Runoff Depth>3.55" Tc=6.0 m i n 2- CN=82 1- 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16' 17„18 '1�9 2'6.'21„22 23 24 Time (hours) Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 17 Hydrograph for Subcatchment 1S: Post-Developed Area to South Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.06 0.00 0.00 1.50 0.09 0.00 0.00 2.00 0.12 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.19 0.00 0.00 3.50 0.23 0.00 0.00 4.00 0.27 0.00 0.00 4.50 0.31 0.00 0.00 5.00 0.35 0.00 0.00 5.50 0.39 0.00 0.00 6.00 0.44 0.00 0.00 6.50 0.49 0.00 0.00 7.00 0.55 0.01 0.01 7.50 0.60 0.01 0.01 8.00 0.66 0.02 0.02 8.50 0.73 0.03 0.02 9.00 0.81 0.05 0.04 9.50 0.90 0.08 0.04 10.00 1.00 0.11 0.06 10.50 1.13 0.16 0.09 11.00 1.30 0.24 0.14 11.50 1.56 0.38 0.26 12.00 3.67 1.92 4.48 12.50 4.06 2.26 0.40 13.00 4.27 2.43 0.25 13.50 4.42 2.56 0.19 14.00 4.53 2.67 0.15 14.50 4.63 2.75 0.13 15.00 4.72 2.83 0.12 15.50 4.80 2.90 0.10 16.00 4.87 2.96 0.09 16.50 4.93 3.01 0.09 17.00 4.99 3.07 0.08 17.50 5.04 3.12 0.08 18.00 5.09 3.16 0.07 18.50 5.14 3.21 0.07 19.00 5.19 3.25 0.06 19.50 5.23 3.28 0.06 20.00 5.26 3.32 0.05 20.50 5.30 3.35 0.05 21.00 5.34 3.38 0.05 21.50 5.37 3.41 0.05 22.00 5.40 3.44 0.05 22.50 5.44 3.47 0.05 23.00 5.47 3.50 0.05 23.50 5.50 3.53 0.04 24.00 5.53 3.56 0.04 Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 18 Summary for Pond 3P: Pipe Storage South Inflow Area = 0.780 ac, 57.69% Impervious, Inflow Depth > 3.55" for 10-Year event Inflow = 4.83 cfs @ 11.97 hrs, Volume= 0.231 af Outflow = 3.01 cfs @ 12.04 hrs, Volume= 0.231 af, Atten= 38%, Lag= 4.4 min Primary = 3.01 cfs @ 12.04 hrs, Volume= 0.231 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 434.94' @ 12.04 hrs Surf.Area= 0.013 ac Storage= 0.041 af Plug-Flow detention time= 6.8 min calculated for 0.231 af(100% of inflow) Center-of-Mass det. time= 5.9 min ( 814.1 -808.2 ) Volume Invert Avail.Storage Storage Description #1 431.50' 0.056 af 60.0" Round Pipe Storage L= 125.0' Device Routing Invert Outlet Devices #1 Primary 431.50' 15.0" Round Culvert L= 50.0' Ke= 0.500 Inlet/Outlet Invert= 431.50'/431.00' S= 0.0100 'I' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 431.50' 6.5"Vert. Orifice/Grate C= 0.600 #3 Device 1 433.50' 6.0"Vert. Orifice/Grate C= 0.600 #4 Device 1 435.50' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 335.50 336.50 Width (feet) 4.00 4.00 Primary OutFlow Max=3.01 cfs @ 12.04 hrs HW=434.94' (Free Discharge) t-1=Culvert (Passes 3.01 cfs of 9.89 cfs potential flow) 2=Orific e/Grate (Orifice Controls 1.98 cfs @ 8.57 fps) -3=Orifice/Grate (Orifice Controls 1.03 cfs @ 5.25 fps) -4=Custom Weir/Orifice ( Controls 0.00 cfs) Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 19 Pond 3P: Pipe Storage South Hydrograph ■Inflow 4.83 ds 1 ■Primary 5- Inflow Area=0.780 ac Peak Eiev=434.94' 4- Storage=0.041 of 3.01 ds 1- 0 --_—_-/ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 3P: Pipe Storage South Stage-Discharge ®Primary 436- 435- o 36-435-0 434 e111111111111.1, W 433- 432- 1111111111111111111111111111 33-432- , 1 . . . . 2 . . . . 3 , , . . 4 . . . . 5 . 6. • , , .7, . , . 8 9 , , , 10 . , .1,1, . . .12. Discharge (cfs) Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 20 Pond 3P: Pipe Storage South Stage-Area-Storage ■Stora e 436- 435- - I - 0 434— w 433- 432- 1111.11.1 33-432- 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.055 Storage(acre-feet) Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 21 Hydrograph for Pond 3P: Pipe Storage South Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 431.50 0.00 0.50 0.00 0.000 431.50 0.00 1.00 0.00 0.000 431.50 0.00 1.50 0.00 0.000 431.50 0.00 2.00 0.00 0.000 431.50 0.00 2.50 0.00 0.000 431.50 0.00 3.00 0.00 0.000 431.50 0.00 3.50 0.00 0.000 431.50 0.00 4.00 0.00 0.000 431.50 0.00 4.50 0.00 0.000 431.50 0.00 5.00 0.00 0.000 431.50 0.00 5.50 0.00 0.000 431.50 0.00 6.00 0.00 0.000 431.50 0.00 6.50 0.00 0.000 431.51 0.00 7.00 0.01 0.000 431.54 0.01 7.50 0.01 0.000 431.56 0.01 8.00 0.02 0.000 431.57 0.02 8.50 0.02 0.000 431.58 0.02 9.00 0.04 0.000 431.60 0.03 9.50 0.04 0.000 431.61 0.04 10.00 0.06 0.000 431.63 0.06 10.50 0.09 0.001 431.67 0.08 11.00 0.14 0.001 431.71 0.13 11.50 0.26 0.001 431.80 0.25 12.00 4.48 0.038 434.72 2.83 12.50 0.40 0.007 432.44 0.90 13.00 0.25 0.001 431.81 0.26 13.50 0.19 0.001 431.76 0.19 14.00 0.15 0.001 431.73 0.15 14.50 0.13 0.001 431.71 0.13 15.00 0.12 0.001 431.70 0.12 15.50 0.10 0.001 431.69 0.11 16.00 0.09 0.001 431.68 0.09 16.50 0.09 0.001 431.67 0.09 17.00 0.08 0.001 431.66 0.08 17.50 0.08 0.001 431.66 0.08 18.00 0.07 0.001 431.65 0.07 18.50 0.07 0.000 431.65 0.07 19.00 0.06 0.000 431.64 0.06 19.50 0.06 0.000 431.63 0.06 20.00 0.05 0.000 431.63 0.05 20.50 0.05 0.000 431.63 0.05 21.00 0.05 0.000 431.62 0.05 21.50 0.05 0.000 431.62 0.05 22.00 0.05 0.000 431.62 0.05 22.50 0.05 0.000 431.62 0.05 23.00 0.05 0.000 431.62 0.05 23.50 0.04 0.000 431.62 0.04 24.00 0.04 0.000 431.62 0.04 Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 22 Stage-Discharge for Pond 3P: Pipe Storage South Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) 431.50 0.00 434.10 2.25 431.55 0.01 434.15 2.31 431.60 0.03 434.20 2.36 431.65 0.07 434.25 2.42 431.70 0.12 434.30 2.47 431.75 0.18 434.35 2.51 431.80 0.24 434.40 2.56 431.85 0.32 434.45 2.61 431.90 0.39 434.50 2.65 431.95 0.47 434.55 2.70 432.00 0.54 434.60 2.74 432.05 0.59 434.65 2.78 432.10 0.64 434.70 2.82 432.15 0.68 434.75 2.86 432.20 0.73 434.80 2.90 432.25 0.77 434.85 2.94 432.30 0.81 434.90 2.98 432.35 0.84 434.95 3.01 432.40 0.88 435.00 3.05 432.45 0.91 435.05 3.09 432.50 0.95 435.10 3.12 432.55 0.98 435.15 3.16 432.60 1.01 435.20 3.19 432.65 1.04 435.25 3.23 432.70 1.07 435.30 3.26 432.75 1.10 435.35 3.29 432.80 1.13 435.40 3.33 432.85 1.15 435.45 3.36 432.90 1.18 435.50 3.39 432.95 1.20 435.55 3.57 433.00 1.23 435.60 3.87 433.05 1.25 435.65 4.25 433.10 1.28 435.70 4.69 433.15 1.30 435.75 5.19 433.20 1.33 435.80 5.73 433.25 1.35 435.85 6.32 433.30 1.37 435.90 6.95 433.35 1.39 435.95 7.63 433.40 1.42 436.00 8.33 433.45 1.44 436.05 9.07 433.50 1.46 436.10 9.85 433.55 1.49 436.15 10.65 433.60 1.53 436.20 11.49 433.65 1.59 436.25 12.00 433.70 1.65 436.30 12.07 433.75 1.73 436.35 12.15 433.80 1.81 436.40 12.22 433.85 1.90 436.45 12.29 433.90 1.98 436.50 12.36 433.95 2.06 434.00 2.13 434.05 2.19 Post-South Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 23 Stage-Area-Storage for Pond 3P: Pipe Storage South Elevation Storage Elevation Storage (feet) (acre-feet) (feet) (acre-feet) 431.50 0.000 434.10 0.030 431.55 0.000 434.15 0.030 431.60 0.000 434.20 0.031 431.65 0.000 434.25 0.032 431.70 0.001 434.30 0.032 431.75 0.001 434.35 0.033 431.80 0.001 434.40 0.034 431.85 0.002 434.45 0.035 431.90 0.002 434.50 0.035 431.95 0.003 434.55 0.036 432.00 0.003 434.60 0.037 432.05 0.003 434.65 0.037 432.10 0.004 434.70 0.038 432.15 0.004 434.75 0.039 432.20 0.005 434.80 0.039 432.25 0.005 434.85 0.040 432.30 0.006 434.90 0.041 432.35 0.006 434.95 0.041 432.40 0.007 435.00 0.042 432.45 0.007 435.05 0.043 432.50 0.008 435.10 0.043 432.55 0.009 435.15 0.044 432.60 0.009 435.20 0.045 432.65 0.010 435.25 0.045 432.70 0.010 435.30 0.046 432.75 0.011 435.35 0.047 432.80 0.012 435.40 0.047 432.85 0.012 435.45 0.048 432.90 0.013 435.50 0.048 432.95 0.014 435.55 0.049 433.00 0.014 435.60 0.049 433.05 0.015 435.65 0.050 433.10 0.016 435.70 0.051 433.15 0.016 435.75 0.051 433.20 0.017 435.80 0.052 433.25 0.018 435.85 0.052 433.30 0.018 435.90 0.053 433.35 0.019 435.95 0.053 433.40 0.020 436.00 0.053 433.45 0.020 436.05 0.054 433.50 0.021 436.10 0.054 433.55 0.022 436.15 0.055 433.60 0.022 436.20 0.055 433.65 0.023 436.25 0.055 433.70 0.024 436.30 0.056 433.75 0.025 436.35 0.056 433.80 0.025 436.40 0.056 433.85 0.026 436.45 0.056 433.90 0.027 436.50 0.056 433.95 0.027 434.00 0.028 434.05 0.029 Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 24 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Post-Developed Area to Runoff Area=0.780 ac 57.69% Impervious Runoff Depth>6.88" Tc=6.0 min CN=82 Runoff=9.01 cfs 0.447 af Pond 3P: Pipe Storage South Peak Elev=436.04' Storage=0.054 af Inflow=9.01 cfs 0.447 af Outflow=8.97 cfs 0.447 af Total Runoff Area=0.780 ac Runoff Volume=0.447 af Average Runoff Depth =6.88" 42.31%Pervious=0.330 ac 57.69%Impervious=0.450 ac Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchment 1S: Post-Developed Area to South Runoff = 9.01 cfs @ 11.97 hrs, Volume= 0.447 af, Depth> 6.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=9.08" Area (ac) CN Description 0.450 98 Paved parking, HSG B 0.330 61 >75% Grass cover, Good, HSG B 0.780 82 Weighted Average 0.330 42.31% Pervious Area 0.450 57.69% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 1S: Post-Developed Area to South Hydrograph 10-7. ■Runoff !solos' Type II 24-hr 6- 100-Year Rainfall=9.08" 7- Runoff Area=0.780 ac 6- Runoff Volume=0.447 af Runoff Depth>6.88" 5- LL Tc=6.0 min 4- CN=82 3- 2- 1- 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 26 Hydrograph for Subcatchment 1S: Post-Developed Area to South Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.05 0.00 0.00 1.00 0.10 0.00 0.00 1.50 0.15 0.00 0.00 2.00 0.20 0.00 0.00 2.50 0.26 0.00 0.00 3.00 0.31 0.00 0.00 3.50 0.37 0.00 0.00 4.00 0.44 0.00 0.00 4.50 0.50 0.00 0.00 5.00 0.57 0.01 0.01 5.50 0.65 0.02 0.02 6.00 0.73 0.03 0.03 6.50 0.81 0.05 0.03 7.00 0.90 0.08 0.04 7.50 0.99 0.11 0.05 8.00 1.09 0.15 0.06 8.50 1.20 0.20 0.08 9.00 1.33 0.26 0.11 9.50 1.48 0.33 0.12 10.00 1.64 0.43 0.16 10.50 1.85 0.55 0.22 11.00 2.13 0.74 0.33 11.50 2.57 1.05 0.58 12.00 6.02 4.01 8.28 12.50 6.67 4.61 0.72 13.00 7.01 4.93 0.44 13.50 7.25 5.16 0.33 14.00 7.45 5.34 0.26 14.50 7.61 5.49 0.23 15.00 7.75 5.62 0.21 15.50 7.88 5.74 0.18 16.00 7.99 5.85 0.16 16.50 8.09 5.95 0.15 17.00 8.19 6.04 0.14 17.50 8.28 6.12 0.13 18.00 8.36 6.20 0.12 18.50 8.44 6.28 0.12 19.00 8.51 6.35 0.11 19.50 8.58 6.41 0.10 20.00 8.64 6.47 0.09 20.50 8.70 6.53 0.09 21.00 8.76 6.58 0.09 21.50 8.82 6.64 0.08 22.00 8.87 6.69 0.08 22.50 8.93 6.74 0.08 23.00 8.98 6.79 0.08 23.50 9.03 6.84 0.08 24.00 9.08 6.89 0.08 Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 27 Summary for Pond 3P: Pipe Storage South Inflow Area = 0.780 ac, 57.69% Impervious, Inflow Depth > 6.88" for 100-Year event Inflow = 9.01 cfs @ 11.97 hrs, Volume= 0.447 af Outflow = 8.97 cfs @ 11.98 hrs, Volume= 0.447 af, Atten= 0%, Lag= 0.4 min Primary = 8.97 cfs @ 11.98 hrs, Volume= 0.447 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 436.04' @ 11.98 hrs Surf.Area= 0.008 ac Storage= 0.054 af Plug-Flow detention time= 6.1 min calculated for 0.447 af(100% of inflow) Center-of-Mass det. time= 5.3 min ( 795.0 - 789.6 ) Volume Invert Avail.Storage Storage Description #1 431.50' 0.056 af 60.0" Round Pipe Storage L= 125.0' Device Routing Invert Outlet Devices #1 Primary 431.50' 15.0" Round Culvert L= 50.0' Ke= 0.500 Inlet/Outlet Invert= 431.50'/431.00' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 431.50' 6.5"Vert. Orifice/Grate C= 0.600 #3 Device 1 433.50' 6.0"Vert. Orifice/Grate C= 0.600 #4 Device 1 435.50' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 335.50 336.50 Width (feet) 4.00 4.00 Primary OutFlow Max=8.95 cfs @ 11.98 hrs HW=436.04' (Free Discharge) t•==Culvert (Passes 8.95 cfs of 11.69 cfs potential flow) 2=Orifice/Grate (Orifice Controls 2.29 cfs @ 9.95 fps) -3=Orifice/Grate (Orifice Controls 1.43 cfs @ 7.29 fps) -@Custom Weir/Orifice (Weir Controls 5.23 cfs @ 2.41 fps) Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 28 Pond 3P: Pipe Storage South Hydrograph al 10- ■inflow 19.01 cis J ■Prima 817 di Inflow Area=0.780 ac 8- Peak EIev=436.04' Storage=0.054 of 6- - 5 g - LL - 4- 3- 2- 1- 0- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 3P: Pipe Storage South Stage-Discharge ■Primary 436- 435- w - 11 ansimmeas 0 434- w - m - w 433- 432- 0 33-432-0 . . . . 1 2 3 4 5 6 . , . . 7 8 910 11 12 Discharge (cfs) Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 29 Pond 3P: Pipe Storage South Stage-Area-Storage ■Storage 436- 435- « m - 0 434- io - w 433- 432- 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.055 Storage(acre-feet) Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 30 Hydrograph for Pond 3P: Pipe Storage South Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 0.00 0.00 0.000 431.50 0.00 0.50 0.00 0.000 431.50 0.00 1.00 0.00 0.000 431.50 0.00 1.50 0.00 0.000 431.50 0.00 2.00 0.00 0.000 431.50 0.00 2.50 0.00 0.000 431.50 0.00 3.00 0.00 0.000 431.50 0.00 3.50 0.00 0.000 431.50 0.00 4.00 0.00 0.000 431.50 0.00 4.50 0.00 0.000 431.52 0.00 5.00 0.01 0.000 431.55 0.01 5.50 0.02 0.000 431.57 0.02 6.00 0.03 0.000 431.59 0.03 6.50 0.03 0.000 431.60 0.03 7.00 0.04 0.000 431.61 0.04 7.50 0.05 0.000 431.63 0.05 8.00 0.06 0.000 431.64 0.06 8.50 0.08 0.001 431.66 0.08 9.00 0.11 0.001 431.69 0.10 9.50 0.12 0.001 431.70 0.12 10.00 0.16 0.001 431.73 0.15 10.50 0.22 0.001 431.78 0.21 11.00 0.33 0.002 431.85 0.31 11.50 0.58 0.003 432.00 0.54 12.00 8.28 0.054 436.01 8.53 12.50 0.72 0.016 433.13 1.29 13.00 0.44 0.003 431.98 0.51 13.50 0.33 0.002 431.87 0.34 14.00 0.26 0.002 431.82 0.27 14.50 0.23 0.001 431.79 0.23 15.00 0.21 0.001 431.77 0.21 15.50 0.18 0.001 431.76 0.19 16.00 0.16 0.001 431.74 0.16 16.50 0.15 0.001 431.73 0.15 17.00 0.14 0.001 431.72 0.14 17.50 0.13 0.001 431.71 0.13 18.00 0.12 0.001 431.71 0.13 18.50 0.12 0.001 431.70 0.12 19.00 0.11 0.001 431.69 0.11 19.50 0.10 0.001 431.68 0.10 20.00 0.09 0.001 431.67 0.09 20.50 0.09 0.001 431.67 0.09 21.00 0.09 0.001 431.67 0.09 21.50 0.08 0.001 431.67 0.08 22.00 0.08 0.001 431.66 0.08 22.50 0.08 0.001 431.66 0.08 23.00 0.08 0.001 431.66 0.08 23.50 0.08 0.001 431.66 0.08 24.00 0.08 0.001 431.66 0.08 Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 31 Stage-Discharge for Pond 3P: Pipe Storage South Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) 431.50 0.00 434.10 2.25 431.55 0.01 434.15 2.31 431.60 0.03 434.20 2.36 431.65 0.07 434.25 2.42 431.70 0.12 434.30 2.47 431.75 0.18 434.35 2.51 431.80 0.24 434.40 2.56 431.85 0.32 434.45 2.61 431.90 0.39 434.50 2.65 431.95 0.47 434.55 2.70 432.00 0.54 434.60 2.74 432.05 0.59 434.65 2.78 432.10 0.64 434.70 2.82 432.15 0.68 434.75 2.86 432.20 0.73 434.80 2.90 432.25 0.77 434.85 2.94 432.30 0.81 434.90 2.98 432.35 0.84 434.95 3.01 432.40 0.88 435.00 3.05 432.45 0.91 435.05 3.09 432.50 0.95 435.10 3.12 432.55 0.98 435.15 3.16 432.60 1.01 435.20 3.19 432.65 1.04 435.25 3.23 432.70 1.07 435.30 3.26 432.75 1.10 435.35 3.29 432.80 1.13 435.40 3.33 432.85 1.15 435.45 3.36 432.90 1.18 435.50 3.39 432.95 1.20 435.55 3.57 433.00 1.23 435.60 3.87 433.05 1.25 435.65 4.25 433.10 1.28 435.70 4.69 433.15 1.30 435.75 5.19 433.20 1.33 435.80 5.73 433.25 1.35 435.85 6.32 433.30 1.37 435.90 6.95 433.35 1.39 435.95 7.63 433.40 1.42 436.00 8.33 433.45 1.44 436.05 9.07 433.50 1.46 436.10 9.85 433.55 1.49 436.15 10.65 433.60 1.53 436.20 11.49 433.65 1.59 436.25 12.00 433.70 1.65 436.30 12.07 433.75 1.73 436.35 12.15 433.80 1.81 436.40 12.22 433.85 1.90 436.45 12.29 433.90 1.98 436.50 12.36 433.95 2.06 434.00 2.13 434.05 2.19 Post-South Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 32 Stage-Area-Storage for Pond 3P: Pipe Storage South Elevation Storage Elevation Storage (feet) (acre-feet) (feet) (acre-feet) 431.50 0.000 434.10 0.030 431.55 0.000 434.15 0.030 431.60 0.000 434.20 0.031 431.65 0.000 434.25 0.032 431.70 0.001 434.30 0.032 431.75 0.001 434.35 0.033 431.80 0.001 434.40 0.034 431.85 0.002 434.45 0.035 431.90 0.002 434.50 0.035 431.95 0.003 434.55 0.036 432.00 0.003 434.60 0.037 432.05 0.003 434.65 0.037 432.10 0.004 434.70 0.038 432.15 0.004 434.75 0.039 432.20 0.005 434.80 0.039 432.25 0.005 434.85 0.040 432.30 0.006 434.90 0.041 432.35 0.006 434.95 0.041 432.40 0.007 435.00 0.042 432.45 0.007 435.05 0.043 432.50 0.008 435.10 0.043 432.55 0.009 435.15 0.044 432.60 0.009 435.20 0.045 432.65 0.010 435.25 0.045 432.70 0.010 435.30 0.046 432.75 0.011 435.35 0.047 432.80 0.012 435.40 0.047 432.85 0.012 435.45 0.048 432.90 0.013 435.50 0.048 432.95 0.014 435.55 0.049 433.00 0.014 435.60 0.049 433.05 0.015 435.65 0.050 433.10 0.016 435.70 0.051 433.15 0.016 435.75 0.051 433.20 0.017 435.80 0.052 433.25 0.018 435.85 0.052 433.30 0.018 435.90 0.053 433.35 0.019 435.95 0.053 433.40 0.020 436.00 0.053 433.45 0.020 436.05 0.054 433.50 0.021 436.10 0.054 433.55 0.022 436.15 0.055 433.60 0.022 436.20 0.055 433.65 0.023 436.25 0.055 433.70 0.024 436.30 0.056 433.75 0.025 436.35 0.056 433.80 0.025 436.40 0.056 433.85 0.026 436.45 0.056 433.90 0.027 436.50 0.056 433.95 0.027 434.00 0.028 434.05 0.029 <5S > Post-Developed Area to West Routed 7,7 6P Post-Developed A a to West S StormTech 8L (new Link) 4bca> i= -on. Link Routing Diagram for Post-West Prepared by Timmons Group, Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 0 2015 HydroCAD Software Solutions LLC Post-West Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.300 61 >75% Grass cover, Good, HSG B (5S, 7S) 0.640 98 Paved parking, HSG B (5S, 7S) 0.940 86 TOTAL AREA Post-West Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.940 HSG B 5S, 7S 0.000 HSG C 0.000 HSG D 0.000 Other 0.940 TOTAL AREA Post-West Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.300 0.000 0.000 0.000 0.300 >75% Grass cover, Good 5S, 7S 0.000 0.640 0.000 0.000 0.000 0.640 Paved parking 5S, 7S 0.000 0.940 0.000 0.000 0.000 0.940 TOTAL AREA Post-West Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 5 Pipe Listing (all nodes) Line# Node In-Invert Out-Invert Length Slope n Diam/Width Height Inside-Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 6P 421.20 420.70 50.0 0.0100 0.013 15.0 0.0 0.0 Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 6 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 5S: Post-Developed Area to Runoff Area=0.440 ac 90.91% Impervious Runoff Depth>3.09" Tc=6.0 min CN=95 Runoff=2.19 cfs 0.113 of Subcatchment 7S: Post-Developed Area to Runoff Area=0.500 ac 48.00% Impervious Runoff Depth>1.69" Tc=6.0 min CN=79 Runoff=1.52 cfs 0.070 af Pond 6P: ADS StormTech Peak EIev=423.54' Storage=1,939 cf Inflow=2.19 cfs 0.113 af Outflow=0.35 cfs 0.112 of Link 8L: (new Link) Inflow=1.81 cfs 0.182 af Primary=1.81 cfs 0.182 of Total Runoff Area=0.940 ac Runoff Volume=0.184 af Average Runoff Depth =2.35" 31.91%Pervious=0.300 ac 68.09%Impervious=0.640 ac Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 5S: Post-Developed Area to West Routed Runoff = 2.19 cfs @ 11.97 hrs, Volume= 0.113 af, Depth> 3.09" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=3.66" Area (ac) CN Description 0.400 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.440 95 Weighted Average 0.040 9.09% Pervious Area 0.400 90.91% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post-Developed Area to West Routed Hydrograph ■Runoff 12.19cts l 2- Type II 24-hr 2-Year Rainfall=3.66" Runoff Area=0.440 ac Runoff Volume=0.113 af Runoff Depth>3.09" Tc=6.0 min u. CN=95 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 8 Hydrograph for Subcatchment 5S: Post-Developed Area to West Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.10 0.00 0.00 3.00 0.13 0.00 0.00 3.50 0.15 0.00 0.00 4.00 0.18 0.01 0.00 4.50 0.20 0.02 0.01 5.00 0.23 0.02 0.01 5.50 0.26 0.04 0.01 6.00 0.29 0.05 0.01 6.50 0.33 0.07 0.02 7.00 0.36 0.08 0.02 7.50 0.40 0.11 0.02 8.00 0.44 0.13 0.02 8.50 0.48 0.16 0.03 9.00 0.54 0.20 0.03 9.50 0.60 0.24 0.04 10.00 0.66 0.29 0.05 10.50 0.75 0.35 0.06 11.00 0.86 0.44 0.09 11.50 1.04 0.59 0.16 12.00 2.43 1.89 2.00 12.50 2.69 2.15 0.17 13.00 2.83 2.28 0.10 13.50 2.92 2.38 0.08 14.00 3.00 2.45 0.06 14.50 3.07 2.51 0.05 15.00 3.12 2.57 0.05 15.50 3.18 2.62 0.04 16.00 3.22 2.67 0.04 16.50 3.26 2.71 0.03 17.00 3.30 2.74 0.03 17.50 3.34 2.78 0.03 18.00 3.37 2.81 0.03 18.50 3.40 2.84 0.03 19.00 3.43 2.87 0.03 19.50 3.46 2.90 0.02 20.00 3.48 2.92 0.02 20.50 3.51 2.95 0.02 21.00 3.53 2.97 0.02 21.50 3.55 2.99 0.02 22.00 3.58 3.01 0.02 22.50 3.60 3.03 0.02 23.00 3.62 3.06 0.02 23.50 3.64 3.08 0.02 24.00 3.66 3.10 0.02 Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 7S: Post-Developed Area to West Runoff = 1.52 cfs @ 11.98 hrs, Volume= 0.070 af, Depth> 1.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 2-Year Rainfall=3.66" Area (ac) CN Description 0.240 98 Paved parking, HSG B 0.260 61 >75% Grass cover, Good, HSG B 0.500 79 Weighted Average 0.260 52.00% Pervious Area 0.240 48.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Post-Developed Area to West / Hydrograph ■Runoff 1152ctsI Type II 24-hr 2-Year Rainfall=3.66" Runoff Area=0.500 ac Runoff Volume=0.070 af 0 Runoff Depth>1.69" Tc=6.0 min LL CN=79 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14„15 16 17 18"19 20 21 22 23 24 Time (hours) Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 10 Hydrograph for Subcatchment 7S: Post-Developed Area to West Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.02 0.00 0.00 1.00 0.04 0.00 0.00 1.50 0.06 0.00 0.00 2.00 0.08 0.00 0.00 2.50 0.10 0.00 0.00 3.00 0.13 0.00 0.00 3.50 0.15 0.00 0.00 4.00 0.18 0.00 0.00 4.50 0.20 0.00 0.00 5.00 0.23 0.00 0.00 5.50 0.26 0.00 0.00 6.00 0.29 0.00 0.00 6.50 0.33 0.00 0.00 7.00 0.36 0.00 0.00 7.50 0.40 0.00 0.00 8.00 0.44 0.00 0.00 8.50 0.48 0.00 0.00 9.00 0.54 0.00 0.00 9.50 0.60 0.00 0.00 10.00 0.66 0.01 0.01 10.50 0.75 0.02 0.01 11.00 0.86 0.04 0.02 11.50 1.04 0.08 0.06 12.00 2.43 0.79 1.43 12.50 2.69 0.97 0.14 13.00 2.83 1.06 0.09 13.50 2.92 1.13 0.07 14.00 3.00 1.19 0.05 14.50 3.07 1.24 0.05 15.00 3.12 1.28 0.04 15.50 3.18 1.32 0.04 16.00 3.22 1.35 0.03 16.50 3.26 1.38 0.03 17.00 3.30 1.41 0.03 17.50 3.34 1.44 0.03 18.00 3.37 1.47 0.03 18.50 3.40 1.49 0.02 19.00 3.43 1.51 0.02 19.50 3.46 1.53 0.02 20.00 3.48 1.55 0.02 20.50 3.51 1.57 0.02 21.00 3.53 1.59 0.02 21.50 3.55 1.61 0.02 22.00 3.58 1.63 0.02 22.50 3.60 1.64 0.02 23.00 3.62 1.66 0.02 23.50 3.64 1.68 0.02 24.00 3.66 1.69 0.02 Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 11 Summary for Pond 6P: ADS StormTech Inflow Area = 0.440 ac, 90.91% Impervious, Inflow Depth > 3.09" for 2-Year event Inflow = 2.19 cfs @ 11.97 hrs, Volume= 0.113 af Outflow = 0.35 cfs @ 12.16 hrs, Volume= 0.112 af, Atten= 84%, Lag= 11.7 min Primary = 0.35 cfs @ 12.16 hrs, Volume= 0.112 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 423.54' @ 12.16 hrs Surf.Area= 970 sf Storage= 1,939 cf Plug-Flow detention time=67.3 min calculated for 0.112 af(98% of inflow) Center-of-Mass det. time= 56.7 min ( 829.5- 772.7 ) Volume Invert Avail.Storage Storage Description #1 421.20' 1,213 cf Custom Stage Data(Prismatic) Listed below(Recalc) 5,820 cf Overall -2,789 cf Embedded = 3,031 cf x 40.0% Voids #2 421.20' 2,789 cf ADS_StormTech MC-4500+Cap @ 100.00' L Inside#1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 100.00'L = 2,645.7 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 2 Rows of 0 Chambers Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 4,001 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 421.20 970 0 0 427.20 970 5,820 5,820 Device Routing Invert Outlet Devices #1 Primary 421.20' 15.0" Round Culvert L= 50.0' Ke= 0.500 Inlet/Outlet Invert= 421.20'/420.70' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 426.20' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 326.20 326.70 326.70 327.20 Width (feet) 1.00 1.00 4.00 4.00 #3 Device 1 421.20' 3.0"Vert. Orifice/Grate C= 0.600 #4 Device 1 423.80' 8.0"Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=0.35 cfs @ 12.16 hrs HW=423.54' (Free Discharge) '--.=Culvert (Passes 0.35 cfs of 7.60 cfs potential flow) 2=Custom Weir/Orifice ( Controls 0.00 cfs) -3=Orifice/Grate (Orifice Controls 0.35 cfs @ 7.16 fps) - 4=Orifice/Grate ( Controls 0.00 cfs) Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 12 Pond 6P: ADS StormTech Hydrograph zieds I ■Inflow ■Prima Inflow Area=0.440 ac 2- Peak EIev=423.54' Storage=1,939 cf V O LL 1- 0.35ds 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 6P: ADS StormTech Stage-Discharge 427- ■Prima al 426- 425- c o - a 424- 0 w - 423- 422- 0 . , . . 1 2 3 4 5 6 7 8 9 10 Discharge (cfs) Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 13 Pond 6P: ADS StormTech Stage-Area-Storage 427- ■Storage 426- 425- J c a - f, 424- > . •m w 423- 422- 0 500 1000 1,500 2000 2,500 3,000 3,500 4,000 Storage(cubic-feet) Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 14 Hydrograph for Pond 6P: ADS StormTech Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 421.20 0.00 0.50 0.00 0 421.20 0.00 1.00 0.00 0 421.20 0.00 1.50 0.00 0 421.20 0.00 2.00 0.00 0 421.20 0.00 2.50 0.00 0 421.20 0.00 3.00 0.00 1 421.20 0.00 3.50 0.00 4 421.20 0.00 4.00 0.00 9 421.21 0.00 4.50 0.01 16 421.22 0.00 5.00 0.01 25 421.23 0.00 5.50 0.01 34 421.24 0.01 6.00 0.01 45 421.25 0.01 6.50 0.02 57 421.27 0.01 7.00 0.02 67 421.28 0.01 7.50 0.02 75 421.29 0.02 8.00 0.02 82 421.30 0.02 8.50 0.03 90 421.30 0.02 9.00 0.03 103 421.32 0.03 9.50 0.04 114 421.33 0.03 10.00 0.05 126 421.35 0.04 10.50 0.06 146 421.37 0.05 11.00 0.09 180 421.41 0.07 11.50 0.16 252 421.49 0.10 12.00 2.00 1,588 423.09 0.31 12.50 0.17 1,807 423.37 0.34 13.00 0.10 1,461 422.94 0.30 13.50 0.08 1,121 422.52 0.26 14.00 0.06 819 422.16 0.22 14.50 0.05 572 421.87 0.17 15.00 0.05 387 421.65 0.13 15.50 0.04 260 421.50 0.10 16.00 0.04 182 421.41 0.07 16.50 0.03 144 421.37 0.05 17.00 0.03 127 421.35 0.04 17.50 0.03 118 421.34 0.03 18.00 0.03 112 421.33 0.03 18.50 0.03 107 421.32 0.03 19.00 0.03 103 421.32 0.03 19.50 0.02 99 421.31 0.03 20.00 0.02 95 421.31 0.02 20.50 0.02 91 421.31 0.02 21.00 0.02 88 421.30 0.02 21.50 0.02 87 421.30 0.02 22.00 0.02 86 421.30 0.02 22.50 0.02 85 421.30 0.02 23.00 0.02 84 421.30 0.02 23.50 0.02 83 421.30 0.02 24.00 0.02 82 421.29 0.02 Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 15 Stage-Discharge for Pond 6P: ADS StormTech Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) 421.20 0.00 423.28 0.33 425.36 2.34 421.24 0.00 423.32 0.33 425.40 2.37 421.28 0.01 423.36 0.34 425.44 2.40 421.32 0.03 423.40 0.34 425.48 2.43 421.36 0.05 423.44 0.34 425.52 2.46 421.40 0.06 423.48 0.35 425.56 2.49 421.44 0.08 423.52 0.35 425.60 2.52 421.48 0.09 423.56 0.35 425.64 2.55 421.52 0.10 423.60 0.36 425.68 2.58 421.56 0.11 423.64 0.36 425.72 2.61 421.60 0.12 423.68 0.36 425.76 2.64 421.64 0.13 423.72 0.37 425.80 2.67 421.68 0.14 423.76 0.37 425.84 2.70 421.72 0.15 423.80 0.37 425.88 2.73 421.76 0.16 423.84 0.38 425.92 2.75 421.80 0.16 423.88 0.40 425.96 2.78 421.84 0.17 423.92 0.43 426.00 2.81 421.88 0.18 423.96 0.47 426.04 2.83 421.92 0.18 424.00 0.52 426.08 2.86 421.96 0.19 424.04 0.58 426.12 2.89 422.00 0.19 424.08 0.64 426.16 2.91 422.04 0.20 424.12 0.71 426.20 2.94 422.08 0.21 424.16 0.79 426.24 2.99 422.12 0.21 424.20 0.87 426.28 3.06 422.16 0.22 424.24 0.96 426.32 3.15 422.20 0.22 424.28 1.04 426.36 3.25 422.24 0.23 424.32 1.13 426.40 3.36 422.28 0.23 424.36 1.21 426.44 3.47 422.32 0.24 424.40 1.29 426.48 3.60 422.36 0.24 424.44 1.36 426.52 3.73 422.40 0.25 424.48 1.41 426.56 3.87 422.44 0.25 424.52 1.47 426.60 4.01 422.48 0.25 424.56 1.52 426.64 4.16 422.52 0.26 424.60 1.58 426.68 4.32 422.56 0.26 424.64 1.63 426.72 4.51 422.60 0.27 424.68 1.68 426.76 4.79 422.64 0.27 424.72 1.72 426.80 5.13 422.68 0.28 424.76 1.77 426.84 5.51 422.72 0.28 424.80 1.81 426.88 5.93 422.76 0.28 424.84 1.86 426.92 6.38 422.80 0.29 424.88 1.90 426.96 6.86 422.84 0.29 424.92 1.94 427.00 7.37 422.88 0.29 424.96 1.98 427.04 7.90 422.92 0.30 425.00 2.02 427.08 8.46 422.96 0.30 425.04 2.06 427.12 9.04 423.00 0.31 425.08 2.09 427.16 9.64 423.04 0.31 425.12 2.13 427.20 10.26 423.08 0.31 425.16 2.17 423.12 0.32 425.20 2.20 423.16 0.32 425.24 2.24 423.20 0.32 425.28 2.27 423.24 0.33 425.32 2.30 Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 16 Stage-Area-Storage for Pond 6P: ADS StormTech Elevation Storage Elevation Storage Elevation Storage (feet) (cubic-feet) (feet) (cubic-feet) (feet) (cubic-feet) 421.20 0 423.28 1,738 425.36 3,213 421.24 35 423.32 1,769 425.40 3,236 421.28 69 423.36 1,801 425.44 3,259 421.32 104 423.40 1,832 425.48 3,282 421.36 138 423.44 1,864 425.52 3,304 421.40 173 423.48 1,895 425.56 3,326 421.44 207 423.52 1,926 425.60 3,348 421.48 241 423.56 1,957 425.64 3,369 421.52 276 423.60 1,988 425.68 3,389 421.56 310 423.64 2,019 425.72 3,409 421.60 344 423.68 2,050 425.76 3,428 421.64 379 423.72 2,081 425.80 3,446 421.68 413 423.76 2,111 425.84 3,464 421.72 447 423.80 2,142 425.88 3,481 421.76 481 423.84 2,172 425.92 3,498 421.80 515 423.88 2,202 425.96 3,515 421.84 549 423.92 2,232 426.00 3,532 421.88 583 423.96 2,262 426.04 3,549 421.92 617 424.00 2,292 426.08 3,565 421.96 651 424.04 2,322 426.12 3,581 422.00 685 424.08 2,352 426.16 3,597 422.04 719 424.12 2,381 426.20 3,613 422.08 753 424.16 2,410 426.24 3,629 422.12 786 424.20 2,440 426.28 3,644 422.16 820 424.24 2,469 426.32 3,660 422.20 854 424.28 2,498 426.36 3,675 422.24 887 424.32 2,527 426.40 3,691 422.28 921 424.36 2,555 426.44 3,706 422.32 954 424.40 2,584 426.48 3,722 422.36 988 424.44 2,612 426.52 3,737 422.40 1,021 424.48 2,640 426.56 3,753 422.44 1,054 424.52 2,668 426.60 3,768 422.48 1,087 424.56 2,696 426.64 3,784 422.52 1,121 424.60 2,724 426.68 3,799 422.56 1,154 424.64 2,752 426.72 3,815 422.60 1,187 424.68 2,779 426.76 3,830 422.64 1,220 424.72 2,806 426.80 3,846 422.68 1,253 424.76 2,833 426.84 3,861 422.72 1,286 424.80 2,860 426.88 3,877 422.76 1,318 424.84 2,887 426.92 3,892 422.80 1,351 424.88 2,913 426.96 3,908 422.84 1,384 424.92 2,939 427.00 3,924 422.88 1,416 424.96 2,965 427.04 3,939 422.92 1,449 425.00 2,991 427.08 3,955 422.96 1,481 425.04 3,017 427.12 3,970 423.00 1,514 425.08 3,042 427.16 3,986 423.04 1,546 425.12 3,067 427.20 4,001 423.08 1,578 425.16 3,092 423.12 1,610 425.20 3,117 423.16 1,642 425.24 3,141 423.20 1,674 425.28 3,166 423.24 1,706 425.32 3,190 Post-West Type 1124-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Panted 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 17 Summary for Link 8L: (new Link) Inflow Area = 0.940 ac, 68.09% Impervious, Inflow Depth > 2.32" for 2-Year event Inflow = 1.81 cfs @ 11.98 hrs, Volume= 0.182 af Primary = 1.81 cfs @ 11.98 hrs, Volume= 0.182 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Link 8L: (new Link) Hydrograph / 111 Inflow 2- _>»ds ■Prima '181 cis Inflow Area=0.940 ac V 1- o T. �� 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post-West Type II 24-hr 2-Year Rainfall=3.66" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 18 Hydrograph for Link 8L: (new Link) Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.50 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.50 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.50 0.00 0.00 0.00 4.00 0.00 0.00 0.00 4.50 0.00 0.00 0.00 5.00 0.00 0.00 0.00 5.50 0.01 0.00 0.01 6.00 0.01 0.00 0.01 6.50 0.01 0.00 0.01 7.00 0.01 0.00 0.01 7.50 0.02 0.00 0.02 8.00 0.02 0.00 0.02 8.50 0.02 0.00 0.02 9.00 0.03 0.00 0.03 9.50 0.04 0.00 0.04 10.00 0.04 0.00 0.04 10.50 0.06 0.00 0.06 11.00 0.09 0.00 0.09 11.50 0.15 0.00 0.15 12.00 1.74 0.00 1.74 12.50 0.48 0.00 0.48 13.00 0.39 0.00 0.39 13.50 0.32 0.00 0.32 14.00 0.27 0.00 0.27 14.50 0.22 0.00 0.22 15.00 0.18 0.00 0.18 15.50 0.14 0.00 0.14 16.00 0.10 0.00 0.10 16.50 0.08 0.00 0.08 17.00 0.07 0.00 0.07 17.50 0.06 0.00 0.06 18.00 0.06 0.00 0.06 18.50 0.05 0.00 0.05 19.00 0.05 0.00 0.05 19.50 0.05 0.00 0.05 20.00 0.04 0.00 0.04 20.50 0.04 0.00 0.04 21.00 0.04 0.00 0.04 21.50 0.04 0.00 0.04 22.00 0.04 0.00 0.04 22.50 0.04 0.00 0.04 23.00 0.04 0.00 0.04 23.50 0.03 0.00 0.03 24.00 0.03 0.00 0.03 Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 19 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 5S: Post-Developed Area to Runoff Area=0.440 ac 90.91% Impervious Runoff Depth>4.94" Tc=6.0 min CN=95 Runoff=3.40 cfs 0.181 af Subcatchment 7S: Post-Developed Area to Runoff Area=0.500 ac 48.00% Impervious Runoff Depth>3.26" Tc=6.0 min CN=79 Runoff=2.88 cfs 0.136 of Pond 6P: ADS StormTech Peak EIev=424.62' Storage=2,735 cf Inflow=3.40 cfs 0.181 af Outflow=1.60 cfs 0.179 af Link 8L: (new Link) Inflow=3.85 cfs 0.315 af Primary=3.85 cfs 0.315 af Total Runoff Area=0.940 ac Runoff Volume=0.317 af Average Runoff Depth =4.05" 31.91% Pervious=0.300 ac 68.09%Impervious= 0.640 ac Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Pape 20 Summary for Subcatchment 5S: Post-Developed Area to West Routed Runoff = 3.40 cfs @ 11.97 hrs, Volume= 0.181 af, Depth> 4.94" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=5.53" Area (ac) CN Description 0.400 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.440 95 Weighted Average 0.040 9.09% Pervious Area 0.400 90.91% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post-Developed Area to West Routed Hydrograph ■Runoff 3.40 ds Type 1124-hr 3- 10-Year Rainfall=5.53" Runoff Area=0.440 ac Runoff Volume=0.181 af 2 Runoff Depth>4.94" LL Tc=6.0 min CN=95 1- 0 ., ,., ,,,. 0 1 2 3 4 5 6 7 9 80 11 12 13 14 15 16 171 18 19 20 21 „22 23 24 Time (hours) Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 21 Hydrograph for Subcatchment 5S: Post-Developed Area to West Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.06 0.00 0.00 1.50 0.09 0.00 0.00 2.00 0.12 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.19 0.01 0.01 3.50 0.23 0.02 0.01 4.00 0.27 0.04 0.01 4.50 0.31 0.06 0.02 5.00 0.35 0.08 0.02 5.50 0.39 0.10 0.02 6.00 0.44 0.13 0.03 6.50 0.49 0.16 0.03 7.00 0.55 0.20 0.03 7.50 0.60 0.24 0.04 8.00 0.66 0.29 0.04 8.50 0.73 0.34 0.05 9.00 0.81 0.41 0.06 9.50 0.90 0.48 0.07 10.00 1.00 0.56 0.08 10.50 1.13 0.68 0.11 11.00 1.30 0.83 0.15 11.50 1.56 1.07 0.25 12.00 3.67 3.10 3.10 12.50 4.06 3.49 0.26 13.00 4.27 3.70 0.16 13.50 4.42 3.84 0.12 14.00 4.53 3.96 0.09 14.50 4.63 4.06 0.08 15.00 4.72 4.14 0.07 15.50 4.80 4.22 0.07 16.00 4.87 4.29 0.06 16.50 4.93 4.35 0.05 17.00 4.99 4.41 0.05 17.50 5.04 4.46 0.05 18.00 5.09 4.51 0.04 18.50 5.14 4.56 0.04 19.00 5.19 4.60 0.04 19.50 5.23 4.64 0.04 20.00 5.26 4.68 0.03 20.50 5.30 4.72 0.03 21.00 5.34 4.75 0.03 21.50 5.37 4.79 0.03 22.00 5.40 4.82 0.03 22.50 5.44 4.85 0.03 23.00 5.47 4.88 0.03 23.50 5.50 4.91 0.03 24.00 5.53 4.94 0.03 Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 7S: Post-Developed Area to West Runoff = 2.88 cfs @ 11.97 hrs, Volume= 0.136 af, Depth> 3.26" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 10-Year Rainfall=5.53" Area (ac) CN Description 0.240 98 Paved parking, HSG B 0.260 61 >75% Grass cover, Good, HSG B 0.500 79 Weighted Average 0.260 52.00% Pervious Area 0.240 48.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Post-Developed Area to West Hydrograph 3_ II Runoff 12.88 as Type II 24-hr 10-Year Rainfall=5.53" Runoff Area=0.500 ac 2— Runoff Volume=0.136 of Runoff Depth>3.26" Tc=6.0 min CN=79 0 0 1 2 3 4 5 6 7 8 9 10 11 1213 14 15 16 1718 19 20 21 22 23 24 Time (hours) Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 23 Hydrograph for Subcatchment 7S: Post-Developed Area to West Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.03 0.00 0.00 1.00 0.06 0.00 0.00 1.50 0.09 0.00 0.00 2.00 0.12 0.00 0.00 2.50 0.16 0.00 0.00 3.00 0.19 0.00 0.00 3.50 0.23 0.00 0.00 4.00 0.27 0.00 0.00 4.50 0.31 0.00 0.00 5.00 0.35 0.00 0.00 5.50 0.39 0.00 0.00 6.00 0.44 0.00 0.00 6.50 0.49 0.00 0.00 7.00 0.55 0.00 0.00 7.50 0.60 0.00 0.00 8.00 0.66 0.01 0.01 8.50 0.73 0.01 0.01 9.00 0.81 0.03 0.02 9.50 0.90 0.05 0.02 10.00 1.00 0.07 0.03 10.50 1.13 0.11 0.04 11.00 1.30 0.17 0.07 11.50 1.56 0.29 0.14 12.00 3.67 1.70 2.68 12.50 4.06 2.02 0.24 13.00 4.27 2.18 0.15 13.50 4.42 2.31 0.12 14.00 4.53 2.41 0.09 14.50 4.63 2.49 0.08 15.00 4.72 2.56 0.07 15.50 4.80 2.63 0.06 16.00 4.87 2.69 0.06 16.50 4.93 2.74 0.05 17.00 4.99 2.79 0.05 17.50 5.04 2.84 0.05 18.00 5.09 2.88 0.04 18.50 5.14 2.92 0.04 19.00 5.19 2.96 0.04 19.50 5.23 3.00 0.04 20.00 5.26 3.03 0.03 20.50 5.30 3.06 0.03 21.00 5.34 3.09 0.03 21.50 5.37 3.12 0.03 22.00 5.40 3.15 0.03 22.50 5.44 3.18 0.03 23.00 5.47 3.21 0.03 23.50 5.50 3.24 0.03 24.00 5.53 3.26 0.03 Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 24 Summary for Pond 6P: ADS StormTech Inflow Area = 0.440 ac, 90.91% Impervious, Inflow Depth > 4.94" for 10-Year event Inflow = 3.40 cfs @ 11.97 hrs, Volume= 0.181 af Outflow = 1.60 cfs @ 12.06 hrs, Volume= 0.179 af, Atten= 53%, Lag= 5.7 min Primary = 1.60 cfs @ 12.06 hrs, Volume= 0.179 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 424.62' @ 12.06 hrs Surf.Area= 970 sf Storage= 2,735 cf Plug-Flow detention time= 60.8 min calculated for 0.179 af(99% of inflow) Center-of-Mass det. time= 52.2 min ( 813.4- 761.2 ) Volume Invert Avail.Storage Storage Description #1 421.20' 1,213 cf Custom Stage Data(Prismatic) Listed below(Recaic) 5,820 cf Overall -2,789 cf Embedded = 3,031 cf x 40.0% Voids #2 421.20' 2,789 cf ADS_StormTech MC-4500+Cap @ 100.00' L Inside#1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 100.00'L = 2,645.7 cf Overall Size= 100.0"W x 60.0"H x 4.33'L with 0.31' Overlap 2 Rows of 0 Chambers Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 4,001 cf Total Available Storage Elevation Surf.Area Inc.Store Gum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 421.20 970 0 0 427.20 970 5,820 5,820 Device Routing Invert Outlet Devices #1 Primary 421.20' 15.0" Round Culvert L= 50.0' Ke= 0.500 Inlet/Outlet Invert= 421.20'/420.70' S= 0.0100 '/' Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 426.20' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 326.20 326.70 326.70 327.20 Width (feet) 1.00 1.00 4.00 4.00 #3 Device 1 421.20' 3.0"Vert. Oriflce/Grate C= 0.600 #4 Device 1 423.80' 8.0"Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=1.60 cfs @ 12.06 hrs HW=424.61' (Free Discharge) t-1=Culvert (Passes 1.60 cfs of 9.85 cfs potential flow) -2=Custom Weir/Orifice ( Controls 0.00 cfs) -3=Orifice/Grate (Orifice Controls 0.43 cfs @ 8.73 fps) --,4--Orifice/Grate (Orifice Controls 1.17 cfs @ 3.34 fps) Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 25 Pond 6P: ADS StormTech Hydrograph ■Inflow 13.40 ds I ■Primary Inflow Area=0.440 ac 3- Peak EIev=424.62' Storage=2,735 cf 2. 2- 1.60�A{ LL 1- 0 . 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Pond 6P: ADS StormTech Stage-Discharge 427- ■Primary 41111111111111.1111111111 426- 425- o 26-425-0 w 424- atiONIM W ' 423- 422- UNIMMINININK 0 12 3 4 5 6 7 8 9 10 Discharge (cfs) Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 26 Pond 6P: ADS StormTech Stage-Area-Storage 427- ■Storage 426- 425- - c 0 424-* m w 423- 422- 1111111 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 Storage(cubic-feet) Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 27 Hydrograph for Pond 6P: ADS StormTech Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 421.20 0.00 0.50 0.00 0 421.20 0.00 1.00 0.00 0 421.20 0.00 1.50 0.00 0 421.20 0.00 2.00 0.00 0 421.20 0.00 2.50 0.00 5 421.21 0.00 3.00 0.01 14 421.22 0.00 3.50 0.01 25 421.23 0.00 4.00 0.01 39 421.24 0.01 4.50 0.02 54 421.26 0.01 5.00 0.02 68 421.28 0.01 5.50 0.02 80 421.29 0.02 6.00 0.03 90 421.30 0.02 6.50 0.03 99 421.32 0.03 7.00 0.03 108 421.32 0.03 7.50 0.04 115 421.33 0.03 8.00 0.04 122 421.34 0.04 8.50 0.05 132 421.35 0.04 9.00 0.06 149 421.37 0.05 9.50 0.07 165 421.39 0.06 10.00 0.08 182 421.41 0.07 10.50 0.11 215 421.45 0.08 11.00 0.15 277 421.52 0.10 11.50 0.25 414 421.68 0.14 12.00 3.10 2,533 424.33 1.14 12.50 0.26 2,213 423.89 0.41 13.00 0.16 1,904 423.49 0.35 13.50 0.12 1,559 423.06 0.31 14.00 0.09 1,226 422.65 0.27 14.50 0.08 930 422.29 0.23 15.00 0.07 687 422.00 0.19 15.50 0.07 496 421.78 0.16 16.00 0.06 351 421.61 0.13 16.50 0.05 251 421.49 0.10 17.00 0.05 193 421.42 0.07 17.50 0.05 163 421.39 0.06 18.00 0.04 148 421.37 0.05 18.50 0.04 139 421.36 0.05 19.00 0.04 132 421.35 0.04 19.50 0.04 125 421.35 0.04 20.00 0.03 119 421.34 0.04 20.50 0.03 114 421.33 0.03 21.00 0.03 112 421.33 0.03 21.50 0.03 110 421.33 0.03 22.00 0.03 109 421.33 0.03 22.50 0.03 107 421.32 0.03 23.00 0.03 106 421.32 0.03 23.50 0.03 105 421.32 0.03 24.00 0.03 104 421.32 0.03 Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 28 Stage-Discharge for Pond 6P: ADS StormTech Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) 421.20 0.00 423.28 0.33 425.36 2.34 421.24 0.00 423.32 0.33 425.40 2.37 421.28 0.01 423.36 0.34 425.44 2.40 421.32 0.03 423.40 0.34 425.48 2.43 421.36 0.05 423.44 0.34 425.52 2.46 421.40 0.06 423.48 0.35 425.56 2.49 421.44 0.08 423.52 0.35 425.60 2.52 421.48 0.09 423.56 0.35 425.64 2.55 421.52 0.10 423.60 0.36 425.68 2.58 421.56 0.11 423.64 0.36 425.72 2.61 421.60 0.12 423.68 0.36 425.76 2.64 421.64 0.13 423.72 0.37 425.80 2.67 421.68 0.14 423.76 0.37 425.84 2.70 421.72 0.15 423.80 0.37 425.88 2.73 421.76 0.16 423.84 0.38 425.92 2.75 421.80 0.16 423.88 0.40 425.96 2.78 421.84 0.17 423.92 0.43 426.00 2.81 421.88 0.18 423.96 0.47 426.04 2.83 421.92 0.18 424.00 0.52 426.08 2.86 421.96 0.19 424.04 0.58 426.12 2.89 422.00 0.19 424.08 0.64 426.16 2.91 422.04 0.20 424.12 0.71 426.20 2.94 422.08 0.21 424.16 0.79 426.24 2.99 422.12 0.21 424.20 0.87 426.28 3.06 422.16 0.22 424.24 0.96 426.32 3.15 422.20 0.22 424.28 1.04 426.36 3.25 422.24 0.23 424.32 1.13 426.40 3.36 422.28 0.23 424.36 1.21 426.44 3.47 422.32 0.24 424.40 1.29 426.48 3.60 422.36 0.24 424.44 1.36 426.52 3.73 422.40 0.25 424.48 1.41 426.56 3.87 422.44 0.25 424.52 1.47 426.60 4.01 422.48 0.25 424.56 1.52 426.64 4.16 422.52 0.26 424.60 1.58 426.68 4.32 422.56 0.26 424.64 1.63 426.72 4.51 422.60 0.27 424.68 1.68 426.76 4.79 422.64 0.27 424.72 1.72 426.80 5.13 422.68 0.28 424.76 1.77 426.84 5.51 422.72 0.28 424.80 1.81 426.88 5.93 422.76 0.28 424.84 1.86 426.92 6.38 422.80 0.29 424.88 1.90 426.96 6.86 422.84 0.29 424.92 1.94 427.00 7.37 422.88 0.29 424.96 1.98 427.04 7.90 422.92 0.30 425.00 2.02 427.08 8.46 422.96 0.30 425.04 2.06 427.12 9.04 423.00 0.31 425.08 2.09 427.16 9.64 423.04 0.31 425.12 2.13 427.20 10.26 423.08 0.31 425.16 2.17 423.12 0.32 425.20 2.20 423.16 0.32 425.24 2.24 423.20 0.32 425.28 2.27 423.24 0.33 425.32 2.30 Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 29 Stage-Area-Storage for Pond 6P: ADS StormTech Elevation Storage Elevation Storage Elevation Storage (feet) (cubic-feet) (feet) (cubic-feet) (feet) (cubic-feet) 421.20 0 423.28 1,738 425.36 3,213 421.24 35 423.32 1,769 425.40 3,236 421.28 69 423.36 1,801 425.44 3,259 421.32 104 423.40 1,832 425.48 3,282 421.36 138 423.44 1,864 425.52 3,304 421.40 173 423.48 1,895 425.56 3,326 421.44 207 423.52 1,926 425.60 3,348 421.48 241 423.56 1,957 425.64 3,369 421.52 276 423.60 1,988 425.68 3,389 421.56 310 423.64 2,019 425.72 3,409 421.60 344 423.68 2,050 425.76 3,428 421.64 379 423.72 2,081 425.80 3,446 421.68 413 423.76 2,111 425.84 3,464 421.72 447 423.80 2,142 425.88 3,481 421.76 481 423.84 2,172 425.92 3,498 421.80 515 423.88 2,202 425.96 3,515 421.84 549 423.92 2,232 426.00 3,532 421.88 583 423.96 2,262 426.04 3,549 421.92 617 424.00 2,292 426.08 3,565 421.96 651 424.04 2,322 426.12 3,581 422.00 685 424.08 2,352 426.16 3,597 422.04 719 424.12 2,381 426.20 3,613 422.08 753 424.16 2,410 426.24 3,629 422.12 786 424.20 2,440 426.28 3,644 422.16 820 424.24 2,469 426.32 3,660 422.20 854 424.28 2,498 426.36 3,675 422.24 887 424.32 2,527 426.40 3,691 422.28 921 424.36 2,555 426.44 3,706 422.32 954 424.40 2,584 426.48 3,722 422.36 988 424.44 2,612 426.52 3,737 422.40 1,021 424.48 2,640 426.56 3,753 422.44 1,054 424.52 2,668 426.60 3,768 422.48 1,087 424.56 2,696 426.64 3,784 422.52 1,121 424.60 2,724 426.68 3,799 422.56 1,154 424.64 2,752 426.72 3,815 422.60 1,187 424.68 2,779 426.76 3,830 422.64 1,220 424.72 2,806 426.80 3,846 422.68 1,253 424.76 2,833 426.84 3,861 422.72 1,286 424.80 2,860 426.88 3,877 422.76 1,318 424.84 2,887 426.92 3,892 422.80 1,351 424.88 2,913 426.96 3,908 422.84 1,384 424.92 2,939 427.00 3,924 422.88 1,416 424.96 2,965 427.04 3,939 422.92 1,449 425.00 2,991 427.08 3,955 422.96 1,481 425.04 3,017 427.12 3,970 423.00 1,514 425.08 3,042 427.16 3,986 423.04 1,546 425.12 3,067 427.20 4,001 423.08 1,578 425.16 3,092 423.12 1,610 425.20 3,117 423.16 1,642 425.24 3,141 423.20 1,674 425.28 3,166 423.24 1,706 425.32 3,190 Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 30 Summary for Link 8L: (new Link) Inflow Area = 0.940 ac, 68.09% Impervious, Inflow Depth > 4.01" for 10-Year event Inflow = 3.85 cfs @ 12.01 hrs, Volume= 0.315 of Primary = 3.85 cfs @ 12.01 hrs, Volume= 0.315 af, Atten= 0%, Lag=0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Link 8L: (new Link) Hydrograph ■Inflow 388 ■Primary 41 Inflow Area=0.940 3.854' 3- 2- LL 1- 0 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post-West Type 1124-hr 10-Year Rainfall=5.53" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 31 Hydrograph for Link 8L: (new Link) Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.50 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.50 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 3.00 0.00 0.00 0.00 3.50 0.00 0.00 0.00 4.00 0.01 0.00 0.01 4.50 0.01 0.00 0.01 5.00 0.01 0.00 0.01 5.50 0.02 0.00 0.02 6.00 0.02 0.00 0.02 6.50 0.03 0.00 0.03 7.00 0.03 0.00 0.03 7.50 0.04 0.00 0.04 8.00 0.04 0.00 0.04 8.50 0.05 0.00 0.05 9.00 0.07 0.00 0.07 9.50 0.08 0.00 0.08 10.00 0.10 0.00 0.10 10.50 0.13 0.00 0.13 11.00 0.18 0.00 0.18 11.50 0.29 0.00 0.29 12.00 3.82 0.00 3.82 12.50 0.66 0.00 0.66 13.00 0.50 0.00 0.50 13.50 0.43 0.00 0.43 14.00 0.36 0.00 0.36 14.50 0.31 0.00 0.31 15.00 0.27 0.00 0.27 15.50 0.22 0.00 0.22 16.00 0.18 0.00 0.18 16.50 0.15 0.00 0.15 17.00 0.12 0.00 0.12 17.50 0.11 0.00 0.11 18.00 0.09 0.00 0.09 18.50 0.09 0.00 0.09 19.00 0.08 0.00 0.08 19.50 0.07 0.00 0.07 20.00 0.07 0.00 0.07 20.50 0.06 0.00 0.06 21.00 0.06 0.00 0.06 21.50 0.06 0.00 0.06 22.00 0.06 0.00 0.06 22.50 0.06 0.00 0.06 23.00 0.06 0.00 0.06 23.50 0.06 0.00 0.06 24.00 0.05 0.00 0.05 Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 32 Time span=0.00-24.00 hrs, dt=0.01 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 5S: Post-Developed Area to Runoff Area=0.440 ac 90.91% Impervious Runoff Depth>8.47" Tc=6.0 min CN=95 Runoff=5.66 cfs 0.311 af Subcatchment 7S: Post-Developed Area to Runoff Area=0.500 ac 48.00% Impervious Runoff Depth>6.51" Tc=6.0 min CN=79 Runoff=5.55 cfs 0.271 af Pond 6P: ADS StormTech Peak Elev=426.67' Storage=3,794 cf Inflow=5.66 cfs 0.311 af Outflow=4.27 cfs 0.307 af Link 8L: (new Link) Inflow=8.91 cfs 0.579 af Primary=8.91 cfs 0.579 af Total Runoff Area=0.940 ac Runoff Volume=0.582 af Average Runoff Depth =7.43" 31.91%Pervious=0.300 ac 68.09%Impervious=0.640 ac Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 33 Summary for Subcatchment 5S: Post-Developed Area to West Routed Runoff = 5.66 cfs @ 11.97 hrs, Volume= 0.311 af, Depth> 8.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=9.08" Area (ac) CN Description 0.400 98 Paved parking, HSG B 0.040 61 >75% Grass cover, Good, HSG B 0.440 95 Weighted Average 0.040 9.09% Pervious Area 0.400 90.91% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post-Developed Area to West Routed Hydrograph 6- ■Runoff 15.ee ae 1 Type 11 24-hr 5- 100-Year Rainfall=9.08" Runoff Area=0.440 ac 4- Runoff Volume=0.311 of Runoff Depth>8.47" C 3� LL Tc=6.0 min 2- CN=95 1- 0 0 1 2 3 4 5 6 7 8" 19,"10 11 12 13 -1',i-'1'g' 16 17 18 19 20 21 22 23 24 Time (hours) Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 34 Hydrograph for Subcatchment 5S: Post-Developed Area to West Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.05 0.00 0.00 1.00 0.10 0.00 0.00 1.50 0.15 0.00 0.01 2.00 0.20 0.01 0.01 2.50 0.26 0.03 0.02 3.00 0.31 0.06 0.02 3.50 0.37 0.09 0.03 4.00 0.44 0.13 0.03 4.50 0.50 0.17 0.04 5.00 0.57 0.22 0.05 5.50 0.65 0.27 0.05 6.00 0.73 0.34 0.06 6.50 0.81 0.40 0.06 7.00 0.90 0.48 0.07 7.50 0.99 0.56 0.07 8.00 1.09 0.64 0.08 8.50 1.20 0.74 0.09 9.00 1.33 0.86 0.11 9.50 1.48 0.99 0.12 10.00 1.64 1.15 0.14 10.50 1.85 1.34 0.19 11.00 2.13 1.61 0.26 11.50 2.57 2.03 0.43 12.00 6.02 5.43 5.15 12.50 6.67 6.08 0.43 13.00 7.01 6.42 0.26 13.50 7.25 6.66 0.20 14.00 7.45 6.85 0.16 14.50 7.61 7.01 0.14 15.00 7.75 7.15 0.12 15.50 7.88 7.28 0.11 16.00 7.99 7.39 0.09 16.50 8.09 7.49 0.09 17.00 8.19 7.59 0.08 17.50 8.28 7.68 0.08 18.00 8.36 7.76 0.07 18.50 8.44 7.84 0.07 19.00 8.51 7.91 0.06 19.50 8.58 7.98 0.06 20.00 8.64 8.04 0.05 20.50 8.70 8.10 0.05 21.00 8.76 8.16 0.05 21.50 8.82 8.21 0.05 22.00 8.87 8.27 0.05 22.50 8.93 8.32 0.05 23.00 8.98 8.38 0.05 23.50 9.03 8.43 0.05 24.00 9.08 8.48 0.04 Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Panted 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 35 Summary for Subcatchment 7S: Post-Developed Area to West Runoff = 5.55 cfs @ 11.97 hrs, Volume= 0.271 af, Depth> 6.51" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Type II 24-hr 100-Year Rainfall=9.08" Area (ac) CN Description 0.240 98 Paved parking, HSG B 0.260 61 >75% Grass cover, Good, HSG B 0.500 79 Weighted Average 0.260 52.00% Pervious Area 0.240 48.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Post-Developed Area to West Hydrograph 6- IIRunoff 15.55ds Type II 24-hr 100-Year Rainfall=9.08" Runoff Area=0.500 ac 4, Runoff Volume=0.271 af x Runoff Depth>6.51" 30 LL Tc=6.0 min 2- CN=79 1- 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 36 Hydrograph for Subcatchment 7S: Post-Developed Area to West Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.50 0.05 0.00 0.00 1.00 0.10 0.00 0.00 1.50 0.15 0.00 0.00 2.00 0.20 0.00 0.00 2.50 0.26 0.00 0.00 3.00 0.31 0.00 0.00 3.50 0.37 0.00 0.00 4.00 0.44 0.00 0.00 4.50 0.50 0.00 0.00 5.00 0.57 0.00 0.00 5.50 0.65 0.00 0.01 6.00 0.73 0.01 0.01 6.50 0.81 0.03 0.01 7.00 0.90 0.04 0.02 7.50 0.99 0.07 0.03 8.00 1.09 0.10 0.03 8.50 1.20 0.13 0.04 9.00 1.33 0.19 0.06 9.50 1.48 0.25 0.07 10.00 1.64 0.33 0.09 10.50 1.85 0.44 0.12 11.00 2.13 0.60 0.19 11.50 2.57 0.88 0.34 12.00 6.02 3.70 5.12 12.50 6.67 4.29 0.45 13.00 7.01 4.59 0.28 13.50 7.25 4.82 0.21 14.00 7.45 4.99 0.16 14.50 7.61 5.14 0.14 15.00 7.75 5.28 0.13 15.50 7.88 5.39 0.12 16.00 7.99 5.50 0.10 16.50 8.09 5.59 0.09 17.00 8.19 5.68 0.09 17.50 8.28 5.77 0.08 18.00 8.36 5.85 0.08 18.50 8.44 5.92 0.07 19.00 8.51 5.99 0.07 19.50 8.58 6.05 0.06 20.00 8.64 6.11 0.06 20.50 8.70 6.17 0.06 21.00 8.76 6.22 0.05 21.50 8.82 6.27 0.05 22.00 8.87 6.32 0.05 22.50 8.93 6.37 0.05 23.00 8.98 6.42 0.05 23.50 9.03 6.47 0.05 24.00 9.08 6.52 0.05 Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD®10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 37 Summary for Pond 6P: ADS StormTech Inflow Area = 0.440 ac, 90.91% Impervious, Inflow Depth > 8.47" for 100-Year event Inflow = 5.66 cfs @ 11.97 hrs, Volume= 0.311 af Outflow = 4.27 cfs @ 12.02 hrs, Volume= 0.307 af, Atten= 25%, Lag= 3.4 min Primary = 4.27 cfs @ 12.02 hrs, Volume= 0.307 af Routing by Stor-Ind method, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Peak Elev= 426.67' @ 12.02 hrs Surf.Area= 970 sf Storage= 3,794 cf Plug-Flow detention time= 50.4 min calculated for 0.307 af(99% of inflow) Center-of-Mass det. time= 43.6 min ( 793.4- 749.8 ) Volume Invert Avail.Storage Storage Description #1 421.20' 1,213 cf Custom Stage Data(Prismatic) Listed below(Recalc) 5,820 cf Overall -2,789 cf Embedded = 3,031 cf x 40.0% Voids #2 421.20' 2,789 cf ADS StormTech MC-4500+Cap©100.00' L Inside#1 Effective Size= 90.4"W x 60.0"H => 26.46 sf x 100.00'L = 2,645.7 cf Overall Size= 100.0'W x 60.0"H x 4.33'L with 0.31' Overlap 2 Rows of 0 Chambers Cap Storage= +35.7 cf x 2 x 2 rows = 142.8 cf 4,001 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 421.20 970 0 0 427.20 970 5,820 5,820 Device Routing Invert Outlet Devices #1 Primary 421.20' 15.0" Round Culvert L= 50.0' Ke= 0.500 Inlet/Outlet Invert= 421.20'/420.70' S= 0.0100 '1 Cc= 0.900 n= 0.013, Flow Area= 1.23 sf #2 Device 1 426.20' Custom Weir/Orifice, Cv=2.62(C=3.28) Head (feet) 326.20 326.70 326.70 327.20 Width (feet) 1.00 1.00 4.00 4.00 #3 Device 1 421.20' 3.0"Vert. Orifice/Grate C= 0.600 #4 Device 1 423.80' 8.0"Vert. Orifice/Grate C= 0.600 Primary OutFlow Max=4.25 cfs @ 12.02 hrs HW=426.66' (Free Discharge) 4L-.=Culvert (Passes 4.25 cfs of 13.00 cfs potential flow) 2=Custom Weir/Orifice (Weir Controls 1.03 cfs @ 2.23 fps) -3=Orifice/Grate (Orifice Controls 0.55 cfs @ 11.12 fps) -4=Orifice/Grate (Orifice Controls 2.67 cfs @ 7.66 fps) Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 38 Pond 6P: ADS StormTech Hydrograph S66cfs ■Inflow ■Primary Inflow Area=0.440 ac Peak EIev=426.67' cap Storage=3,794 cf 4- v - c 3, LL 2- 1- 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 1 29 0 2122 23 24 Time (hours) Pond 6P: ADS StormTech Stage-Discharge 427- _ ■Prima 1111111111111.11,4 426- 425- - c o - A 424- m w 423- 422- 0 1 2 3 4 5 6 7 8 9 10 Discharge (cfs) Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 39 Pond 6P: ADS StorrnTech Stage-Area-Storage 427- ■Sto _.e 426- 425- c o - m 424- > m w 423- 422- 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 Storage(cubic-feet) Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Printed 12/12/201 Page 40 Hydrograph for Pond 6P: ADS StormTech Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 421.20 0.00 0.50 0.00 0 421.20 0.00 1.00 0.00 0 421.20 0.00 1.50 0.01 3 421.20 0.00 2.00 0.01 16 421.22 0.00 2.50 0.02 37 421.24 0.01 3.00 0.02 63 421.27 0.01 3.50 0.03 84 421.30 0.02 4.00 0.03 101 421.32 0.03 4.50 0.04 114 421.33 0.03 5.00 0.05 126 421.35 0.04 5.50 0.05 137 421.36 0.04 6.00 0.06 148 421.37 0.05 6.50 0.06 158 421.38 0.06 7.00 0.07 168 421.39 0.06 7.50 0.07 178 421.41 0.07 8.00 0.08 188 421.42 0.07 8.50 0.09 205 421.44 0.08 9.00 0.11 238 421.48 0.09 9.50 0.12 273 421.52 0.10 10.00 0.14 311 421.56 0.11 10.50 0.19 387 421.65 0.13 11.00 0.26 522 421.81 0.16 11.50 0.43 799 422.14 0.21 12.00 5.15 3,737 426.52 3.73 12.50 0.43 2,350 424.08 0.64 13.00 0.26 2,132 423.79 0.37 13.50 0.20 1,895 423.48 0.35 14.00 0.16 1,614 423.12 0.32 14.50 0.14 1,332 422.78 0.28 15.00 0.12 1,082 422.47 0.25 15.50 0.11 863 422.21 0.22 16.00 0.09 673 421.99 0.19 16.50 0.09 517 421.80 0.16 17.00 0.08 401 421.67 0.14 17.50 0.08 318 421.57 0.12 18.00 0.07 260 421.50 0.10 18.50 0.07 222 421.46 0.09 19.00 0.06 195 421.43 0.07 19.50 0.06 178 421.41 0.07 20.00 0.05 165 421.39 0.06 20.50 0.05 156 421.38 0.05 21.00 0.05 151 421.38 0.05 21.50 0.05 148 421.37 0.05 22.00 0.05 146 421.37 0.05 22.50 0.05 144 421.37 0.05 23.00 0.05 142 421.36 0.05 23.50 0.05 140 421.36 0.05 24.00 0.04 138 421.36 0.05 Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 41 Stage-Discharge for Pond 6P: ADS StormTech Elevation Primary Elevation Primary Elevation Primary (feet) (cfsl (feet) (cfs) (feet) (cfs) 421.20 0.00 423.28 0.33 425.36 2.34 421.24 0.00 423.32 0.33 425.40 2.37 421.28 0.01 423.36 0.34 425.44 2.40 421.32 0.03 423.40 0.34 425.48 2.43 421.36 0.05 423.44 0.34 425.52 2.46 421.40 0.06 423.48 0.35 425.56 2.49 421.44 0.08 423.52 0.35 425.60 2.52 421.48 0.09 423.56 0.35 425.64 2.55 421.52 0.10 423.60 0.36 425.68 2.58 421.56 0.11 423.64 0.36 425.72 2.61 421.60 0.12 423.68 0.36 425.76 2.64 421.64 0.13 423.72 0.37 425.80 2.67 421.68 0.14 423.76 0.37 425.84 2.70 421.72 0.15 423.80 0.37 425.88 2.73 421.76 0.16 423.84 0.38 425.92 2.75 421.80 0.16 423.88 0.40 425.96 2.78 421.84 0.17 423.92 0.43 426.00 2.81 421.88 0.18 423.96 0.47 426.04 2.83 421.92 0.18 424.00 0.52 426.08 2.86 421.96 0.19 424.04 0.58 426.12 2.89 422.00 0.19 424.08 0.64 426.16 2.91 422.04 0.20 424.12 0.71 426.20 2.94 422.08 0.21 424.16 0.79 426.24 2.99 422.12 0.21 424.20 0.87 426.28 3.06 422.16 0.22 424.24 0.96 426.32 3.15 422.20 0.22 424.28 1.04 426.36 3.25 422.24 0.23 424.32 1.13 426.40 3.36 422.28 0.23 424.36 1.21 426.44 3.47 422.32 0.24 424.40 1.29 426.48 3.60 422.36 0.24 424.44 1.36 426.52 3.73 422.40 0.25 424.48 1.41 426.56 3.87 422.44 0.25 424.52 1.47 426.60 4.01 422.48 0.25 424.56 1.52 426.64 4.16 422.52 0.26 424.60 1.58 426.68 4.32 422.56 0.26 424.64 1.63 426.72 4.51 422.60 0.27 424.68 1.68 426.76 4.79 422.64 0.27 424.72 1.72 426.80 5.13 422.68 0.28 424.76 1.77 426.84 5.51 422.72 0.28 424.80 1.81 426.88 5.93 422.76 0.28 424.84 1.86 426.92 6.38 422.80 0.29 424.88 1.90 426.96 6.86 422.84 0.29 424.92 1.94 427.00 7.37 422.88 0.29 424.96 1.98 427.04 7.90 422.92 0.30 425.00 2.02 427.08 8.46 422.96 0.30 425.04 2.06 427.12 9.04 423.00 0.31 425.08 2.09 427.16 9.64 423.04 0.31 425.12 2.13 427.20 10.26 423.08 0.31 425.16 2.17 423.12 0.32 425.20 2.20 423.16 0.32 425.24 2.24 423.20 0.32 425.28 2.27 423.24 0.33 425.32 2.30 Post-West Type 1124-hr 100-Year Rainfall=9.08" Prepared by Timmons Group Printed 12/12/2017 HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Page 42 Stage-Area-Storage for Pond 6P: ADS StormTech Elevation Storage Elevation Storage Elevation Storage (feet) (cubic-feet) (feet) (cubic-feet) (feet) (cubic-feet) 421.20 0 423.28 1,738 425.36 3,213 421.24 35 423.32 1,769 425.40 3,236 421.28 69 423.36 1,801 425.44 3,259 421.32 104 423.40 1,832 425.48 3,282 421.36 138 423.44 1,864 425.52 3,304 421.40 173 423.48 1,895 425.56 3,326 421.44 207 423.52 1,926 425.60 3,348 421.48 241 423.56 1,957 425.64 3,369 421.52 276 423.60 1,988 425.68 3,389 421.56 310 423.64 2,019 425.72 3,409 421.60 344 423.68 2,050 425.76 3,428 421.64 379 423.72 2,081 425.80 3,446 421.68 413 423.76 2,111 425.84 3,464 421.72 447 423.80 2,142 425.88 3,481 421.76 481 423.84 2,172 425.92 3,498 421.80 515 423.88 2,202 425.96 3,515 421.84 549 423.92 2,232 426.00 3,532 421.88 583 423.96 2,262 426.04 3,549 421.92 617 424.00 2,292 426.08 3,565 421.96 651 424.04 2,322 426.12 3,581 422.00 685 424.08 2,352 426.16 3,597 422.04 719 424.12 2,381 426.20 3,613 422.08 753 424.16 2,410 426.24 3,629 422.12 786 424.20 2,440 426.28 3,644 422.16 820 424.24 2,469 426.32 3,660 422.20 854 424.28 2,498 426.36 3,675 422.24 887 424.32 2,527 426.40 3,691 422.28 921 424.36 2,555 426.44 3,706 422.32 954 424.40 2,584 426.48 3,722 422.36 988 424.44 2,612 426.52 3,737 422.40 1,021 424.48 2,640 426.56 3,753 422.44 1,054 424.52 2,668 426.60 3,768 422.48 1,087 424.56 2,696 426.64 3,784 422.52 1,121 424.60 2,724 426.68 3,799 422.56 1,154 424.64 2,752 426.72 3,815 422.60 1,187 424.68 2,779 426.76 3,830 422.64 1,220 424.72 2,806 426.80 3,846 422.68 1,253 424.76 2,833 426.84 3,861 422.72 1,286 424.80 2,860 426.88 3,877 422.76 1,318 424.84 2,887 426.92 3,892 422.80 1,351 424.88 2,913 426.96 3,908 422.84 1,384 424.92 2,939 427.00 3,924 422.88 1,416 424.96 2,965 427.04 3,939 422.92 1,449 425.00 2,991 427.08 3,955 422.96 1,481 425.04 3,017 427.12 3,970 423.00 1,514 425.08 3,042 427.16 3,986 423.04 1,546 425.12 3,067 427.20 4,001 423.08 1,578 425.16 3,092 423.12 1,610 425.20 3,117 423.16 1,642 425.24 3,141 423.20 1,674 425.28 3,166 423.24 1,706 425.32 3,190 Post-West Prepared by Timmons Group Type 1124-hr 100-Year Rainfall=9.08" HydroCAD® 10.00-16 s/n 06538 ©2015 HydroCAD Software Solutions LLC Printed 12/12/2017 Paae 43 Summary for Link 8L: (new Link) Inflow Area = 0.940 ac, 68.09% Impervious, Inflow Depth > 7.39" for 100-Year event Inflow = 8.91 cfs @ 12.01 hrs, Volume= 0.579 af Primary = 8.91 cfs @ 12.01 hrs, Volume= 0.579 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-24.00 hrs, dt= 0.01 hrs Link 8L: (new Link) Hydrograph last ds l ■Inflow 9- Inflow Area=0.940® ■Primary 8- 7- _ 6- u - 5- 0 LL 4- 3- 2- 1- A 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time (hours) Post-West Type 11 24-hr 100-Year Rainfall=9.08" Prepared by Timmons Group H droCAD® 10.00-16 s/n 06538 ©2015 H droCAD Software Solutions LLC Printed 12/12/2017 Pa•e 44 Hydrograph for Link 8L: (new Link) Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 0.50 0.00 0.00 0.00 1.00 0.00 0.00 0.00 1.50 0.00 0.00 0.00 2.00 0.00 0.00 0.00 2.50 0.01 0.00 0.01 3.00 0.01 0.00 0.01 3.50 0.02 0.00 0.02 4.00 0.03 0.00 0.03 4.50 0.03 0.00 0.03 5.00 0.04 0.00 0.04 5.50 0.05 0.00 0.05 6.00 0.06 0.00 0.06 6.50 0.07 0.00 0.07 7.00 0.08 0.00 0.08 7.50 0.09 0.00 0.09 8.00 0.10 0.00 0.10 8.50 0.12 0.00 0.12 9.00 0.15 0.00 0.15 9.50 0.17 0.00 0.17 10.00 0.20 0.00 0.20 10.50 0.26 0.00 0.26 11.00 0.35 0.00 0.35 11.50 0.55 0.00 0.55 12.00 8.85 0.00 8.85 12.50 1.09 0.00 1.09 13.00 0.65 0.00 0.65 13.50 0.56 0.00 0.56 14.00 0.48 0.00 0.48 14.50 0.43 0.00 0.43 15.00 0.38 0.00 0.38 15.50 0.34 0.00 0.34 16.00 0.29 0.00 0.29 16.50 0.26 0.00 0.26 17.00 0.23 0.00 0.23 17.50 0.20 0.00 0.20 18.00 0.18 0.00 0.18 18.50 0.16 0.00 0.16 19.00 0.14 0.00 0.14 19.50 0.13 0.00 0.13 20.00 0.12 0.00 0.12 20.50 0.11 0.00 0.11 21.00 0.11 0.00 0.11 21.50 0.10 0.00 0.10 22.00 0.10 0.00 0.10 22.50 0.10 0.00 0.10 23.00 0.10 0.00 0.10 23.50 0.10 0.00 0.10 24.00 0.09 0.00 0.09