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SDP202100001 Calculations 2020-12-31
Ivy Proper ALBEMARLE COUNTY, VIRGINIA FINAL SITE PLAN DESIGN CALCULATIONS & NARRATIVE DECEMBER 30, 2020 i TIMMONS GROUP YOUR VISION ACHIEVED THROUGH OURS. Prepared by: Clint Shifflett, PE Timmons Group 608 Preston Avenue, Suite 200 Charlottesville, VA 22903 434.327.1690 XH CLINT W. 2 SIUFFLET i Lie. N .54380 �Or 12/30/2020 ZIONAL E� ;••• Table of Contents Section Title 1. Project Narrative 2. LD-204 Inlet Calculations 3. LD-229 Pipe Calculations 4. LD-347 Hydraulic Grade Line Analysis 5. Pre and Post Developed HydroCAD Calculations 6. Virginia Runoff Reduction Method Worksheet Summary Project Narrative: This project includes the construction of a new commercial building and parking lot with associated utilities and landscaping. The limits of disturbance is 0.79 acres. Water Ouality: Currently there exists on site 0.52 acres of forest, 0.01 acres of turf, and 0.26 acres of impervious cover. In the proposed condition there will be 0.00 acres of forest, 0.25 acres of turf, and 0.54 acres of impervious cover. Per the Virginia Runoff Reduction Redevelopment Spreadsheet, this will require that 0.64 lbs/yr of phosphorous be removed. Credits shall be purchased from a DEQ-Approved Nutrient Credit Bank in Accordance with VA code 62.1-44.15:35. Water Ouantity The site drains to an existing pipe under Ivy Road. A 54" CMP storage system is being proposed to detain the increase in flow. The CMP storage system detains the post - developed 1-year storm to meet the energy balance equation, and reduces the post - developed 10-year 24-hour storm to be less than the pre -developed 10-year 24-hour storm. FORM LD 204 STORMWATER INLET COMPUTATIONS SHEET 1 OF 2 ROUTE PROJECT Ivy Proper DESIGNER: KF CHECKED: CS DATE 12/28/2020 UNITS:NGLISH ---®--- 111• � 11 � 11 11 11 11 1: � 111 � 11: � 11�: 111 ���� . 111 ® 111 11 1111 �--__-- ---_--- 1 1 • ��O- 1 1 11 1 1 1 : ® 111 ® 1 1 : � 11 � : -®-----------__-® INLETSOFT BY ENSOFTEC DATE: 12/28/2020 FORM LD 204 STORMWATER INLET COMPUTATIONS SHEET 2 OF 2 ROUTE PROJECT Ivy Proper DESIGNER: KF CHECKED: CS DATE 12/28/2020 UNITS:NGLISH INLET F. Q p Sag Inlets Only z0 2G SE O S� S " 3^ gym, _ of =, ou x F V u u u au u F 3 wFf `3 a r., i5 cox J a u v o r iF � a u�uU r� $� z= RO. v Z y6 V 0• .r ,= LCY 0F 0 5 885 0 0 Ahead/Rt 1.354 0.0100 2000 2 1 354 2.138 1> 80 ft Ex. 100 DI-1 2.000 0.210 0.90 0.189 Back/Lt. 0.000'RIGFY 0.170 0.25 0.0425 Back/Lt. 0.232 4.929 1.144 0 Back/Lt. 0 1 4.929 1 0 0 Ahead/Rt. 1.144 0.0100 2000. 2 1.144 1.911 1 Weir Flow INLETSOFT BY ENSOFTEC DATE: 12/28/2020 LD-229 STORM SEWER DESIGN COMPUTATIONS STORM FREQUENCY 10 PROJECT: LOCATION: COUNTY: Ivy Proper Free Union Designed by: KF Checked by: CS UNITS ENGLISH PIPE FROM POINT TO POINT DRAIN. AREA "A" Acre (3) RUNOFF COEER "C"MENT (4) CA INLET TIME Minutes (7) RAIN FALL In/Hr (8) RUNOFF INVERT ELEVATIONS LENGTH of Pipe Ft. (12) SLOPE Ft./Ft. (13) SIZE (Dia. Or Span/Rise) In. (14) SHAPE Number of Pipes Capacity CFS (15) Friction Slope Ft./Ft. NORMAL FLOW FLOW TIME REMARKS (18) INCRE- (5) ACCUM- ULATED (6) Late7Tota)ISQ CF UPPER END (10) LOWER END (11) Depth of Flow, do Ft. Area of Flow, An SgFt Hrn Ft. Vn Ft/Sec (16) En Ft. INCRE- MENT Minutes (17) ACC11M11NO. -LATER Minutes (17) REFERENCE (1) STA. REFERENCE (2) STA. 101 102 Ex. 100 0.01 0.90 0.01 0.24 5.19 4.88 0.00 16.83 512.56 511.70 86.43 0.00995 24 Circular 1 24.45 0.00490 1.22 2.01 0.56 8.39 2.31 0.17 5.36 103 104 102 0.00 0.00 0.23 5.09 5.86 0.00 16.78 512.89 512.56 44.41 0.00743 24 Circular 1 21.13 0.00490 1.35 2.25 0.58 7.46 2.21 0.10 5.19 105 SWM A 104 0.00 0.00 0.00 5.00 0.00 0.00 15.45 513.00 512.89 6.80 0.01618 24 Circular 1 31.17 0.00410 1.00 1.56 0.50 9.90 2.52 0.01 5.01 107 108 1106 0.08 0.74 0.06 1.37 5.15 5.84 0.00 8.08 514.53 513.67 57.42 0.01498 18 Circular 1 13.93 0.00530 0.82 0.99 0.40 8.17 1.86 0.12 5.27 109 110 108 0.07 0.71 0.05 1.31 5.04 5.87 0.00 7.73 515.41 514.63 52.25 0.01493 18 Circular 1 13.91 0.00480 0.80 0.96 0.39 8.08 1.81 0.11 5.15 111 112 110 3.37 0.38 1.26 1.26 5.00 5.89 0.00 7.44 515.81 515.51 19.87 0.01510 18 Circular 1 13.98 0.00450 0.78 0.93 0.38 8.04 1.78 0.04 5.04 113 114 SWMA 0.20 0.63 0.13 0.13 5.00 5.89 0.00 0.74 515.30 514.29 50.71 0.01992 15 Circular 1 9.88 0.00010 0.23 0.16 0.14 4.74 0.58 0.18 5.18 115 116 104 0.48 0.48 0.23 0.23 5.00 5.89 0.00 1.35 513.25 513.01 23.57 0.01018 15 Circular 1 7.06 0.00040 0.37 0.31 0.21 4.44 0.68 0.09 5.09 Ex. 99 Ex. 100 Ex.98 0.38 0.61 0.23 0.47 5.42 4.82 0.00 8.91 511.60 511.07 49.87 0.01063 24 Circular 1 11.23 0.00700 1.35 2.25 0.58 3.97 1.59 0.21 5.63 LD-347 PROJECT: Ivy Proper DESIGNED BY: KF HYDRAULIC GRADE LINE ANALYSIS Checked: CS INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION STA. INVERT EL. OUTFLOW PIPE DEPTH OF FLOW OUTFLOW PIPE OUTLET WATER SURFACE ELEV. DIA. PIPE Do (In/mm) DESIGN DISCH. Do (CFS/CMS) LENGTH PIPE Lo (FtlM) FRICTION SLOPE, Sfo (FT/FT) (M/M) FRICTION LOSS Hf (FVM) JUNCTION LOSS SURFACE FLOW Adj. Ht 1.3 Ht (FllM) Inlet Shaping? YIN 0.5 Ht (Ft/M) FINAL H (FllM) Inlet Water Surface Elevation Top of MH Top of Inlet Elev. APPROX. Adjustment? Vo Contr. Ho (FtlM) Vi V'2/2g Hi (Expo) 0.35'MAX. (Vi2/2g) SKEW Angle K Bend H (FtlM) Sum HL (Ft/M) 1 2) 3 4 5 6 7 8 9 10 11 12 13 14 15 16) 16 17 18 19 Ex.98 1 511.700 Ex.100 511.070 2.00 512.670 24 8.909 49.87 0.00699 0.349 3.965 0.061 8.389 1.093 0.382 0.0 0.00 0.000 0.444 1.119 0.444 YES 0.222 0.571 513.241 515.150 O.K. 102 511.700 2.00 513.300 24 16.827 86.43 0.00493 0.426 8.389 0.273 7.461 0.864 0.303 0.0 0.00 0.000 0.576 0.044 0.576 YES 0.288 0.714 514.014 518.590 O.K. 104 512.560 2.00 514.160 24 16.783 44.41 0.00490 0.218 7.461 0.216 9.901 1.522 0.533 0.0 0.00 0.000 0.749 0.000 0.749 YES 0.374 0.592 514.752 519.820 O.K. SWM A 512.890 2.00 514.752 24 15.450 6.80 0.00415 0.028 9.901 0.381 4.736 0.348 0.122 0.0 0.00 0.000 0.502 0.000 0.502 YES 0.251 0.279 515.032 517.500 O.K. 114 514.290 1.25 515.290 15 0.742 50.71 0.00012 0.006 4.736 0.087 0.000 0.000 0.000 0.0 0.00 0.000 0.087 0.742 0.113 YES 0.057 0.063 515.532 519.830 O.K. 116 513.010 1.25 514.752 15 1.354 23.57 0.00039 0.009 4.440 0.077 0.000 0.000 0.000 0.0 0.00 0.000 0.077 1.354 0.099 YES 0.050 0.059 514.811 517.500 O.K. LD-347 PROJECT: Ivy Proper DESIGNED BY: KF HYDRAULIC GRADE LINE ANALYSIS Checked: CS INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION STA. INVERT EL. OUTFLOW PIPE DEPTH OF FLOW OUTFLOW PIPE OUTLET WATER SURFACE ELEV. DIA. PIPE Do (In/mm) DESIGN DISCH. Do (CFS/CMS) LENGTH PIPE Lo (FtlM) FRICTION SLOPE, Sfo (FT/FT) (M/M) FRICTION LOSS Hf (FVM) JUNCTION LOSS SURFACE FLOW Adj. Ht 1.3 Ht (FllM) Inlet Shaping? YIN 0.5 Ht (Ft/M) FINAL H (FllM) Inlet Water Surface Elevation Top of MH Top of Inlet Elev. APPROX. Adjustment? Vo Contr. Ho (FtlM) Vi V'2/2g Hi (Expo) 0.35'MAX. (Vi2/2g) SKEW Angle K Bend H (FtlM) Sum HL (Ft/M) 1 2) 3 4 5 6 7) 8 9 10 11 12) (13 14 15 16) 16 17 18 19 106 1 513.670 108 513.670 1.50 514.870 18 8.078 57.42 0.00527 0.302 8.173 0.259 8.078 1.013 0.355 0.0 0.00 0.000 0.614 0.345 0.614 YES 0.307 0.609 515.479 522.050 O.K. 110 514.630 1.50 515.830 18 7.733 52.25 0.00483 0.252 8.078 0.253 8.036 1.003 0.351 0.0 0.00 0.000 0.604 0.294 0.604 YES 0.302 0.554 516.384 521.740 O.K. 112 515.510 1.50 516.710 18 7.439 19.87 0.00447 0.089 8.036 0.251 0.000 0.000 0.000 0.0 0.00 0.000 0.251 7.439 0.326 YES 0.163 0.252 516.962 520.500 O.K. LD-347 PROJECT: Ivy Proper DESIGNED BY: KF HYDRAULIC GRADE LINE ANALYSIS Checked: CS INCIDENCE PROBABILITY 10 Year INLET OR JUNCTION STA INVERT EL. OUTFLOW PIPE DEPTH OF FLOW OUTFLOW PIPE OUTLET WATER SURFACE ELEV. DIA. PIPE Do INmm DESIGN DISCH. Do CFS/CMS) LENGTH PIPE Lo (FVM FRICTION SLOPE, Sfo (FT/FT) M/M FRICTION LOSS Hf FUM JUNCTION LOSS SURFACE FLOW Adj. Ht 1.3 Ht FUM) Inlet Shaping? Y/N 0.5 Ht FUM FINAL H FUM Inlet Water Surface Elevation Top of MH Top of Inlet Elev. APPROX. Adjustment? VO Cont'. Ho FVM) Vi Vi'2/2g Hi (Expo) 0.35'MAX. 2/2) SKEW Angle K Bend H (FUM) Sum HL (FUM) 1 2 3 4 5 6 7 8 9 10 (11) 12 (13) (14) 15 16 16 17 18 19 SWM A 514.290 114 514.290 1.25 515.290 15 0.742 50.71 0.00012 0.006 4.736 0.087 0.000 0.000 0.000 0.0 0.00 0.000 0.087 0.742 0.113 YES 0.057 0.063 515.532 519.830 O.K. 4S O1S 2S 5S Post Offsite uted Pre D eloped ON Site ost ON Site Routed Pre Developed site ���111 A6P 3L (new ond) PRE (8S 7S Post Off Site Un�ted P st ON Site Unrouted 9L (new Link) Subcat Reach Aon Llflk Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Summary for Subcatchment 1S: Pre Developed Offsite Runoff = 4.42 cfs @ 12.03 hrs, Volume= 0.229 af, Depth> 0.68" Printed 12/28/2020 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 1Year Rainfall=3.01" Area (ac) CN 1.470 60 Woods, Fair, HSG B 1.480 61 >75% Grass cover, Good, HSG B 1.080 98 Paved parking, HSG B 4.030 71 Weighted Average 2.950 73.20% Pervious Area 1.080 26.80% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65" 1.9 200 0.0600 1.71 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.4 100 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.0 40 0.0312 16.54 51.95 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.010 PVC. smooth interior 9.7 440 Total ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1 Year Rainfall=3.01 " Printed 12/28/2020 Subcatchment 1S: Pre Developed Offsite Hydrograph ■ Runoff Time (houm) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Subcatchment 1S: Pre Developed Offsite Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.21 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.25 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.34 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.54 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.61 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.77 0.00 0.00 11.50 0.85 0.00 0.00 11.75 1.16 0.03 0.31 12.00 2.00 0.26 4.26 12.25 2.13 0.32 1.14 12.50 2.21 0.36 0.64 12.75 2.27 0.38 0.45 13.00 2.32 0.41 0.39 13.25 2.37 0.43 0.34 13.50 2.40 0.44 0.30 13.75 2.44 0.46 0.27 14.00 2.47 0.48 0.24 14.25 2.50 0.49 0.22 14.50 2.52 0.50 0.21 14.75 2.55 0.51 0.20 15.00 2.57 0.53 0.19 15.25 2.59 0.54 0.18 15.50 2.61 0.55 0.17 15.75 2.63 0.56 0.16 16.00 2.65 0.57 0.15 16.25 2.67 0.58 0.15 16.50 2.68 0.58 0.14 16.75 2.70 0.59 0.14 17.00 2.71 0.60 0.14 17.25 2.73 0.61 0.13 17.50 2.74 0.62 0.13 17.75 2.76 0.63 0.13 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.77 0.63 0.12 18.25 2.79 0.64 0.12 18.50 2.80 0.65 0.11 18.75 2.81 0.65 0.11 19.00 2.82 0.66 0.11 19.25 2.83 0.67 0.10 19.50 2.85 0.67 0.10 19.75 2.86 0.68 0.09 20.00 2.87 0.68 0.09 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Summary for Subcatchment 2S: Pre Developed ON Site Runoff = 1.07 cfs @ 11.98 hrs, Volume= 0.047 af, Depth> 0.73" Printed 12/28/2020 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 1Year Rainfall=3.01" Area (ac) CN 0.520 60 Woods, Fair, HSG B 0.010 61 >75% Grass cover, Good, HSG B 0.250 98 Paved parking, HSG B 0.780 72 Weighted Average 0.530 67.95% Pervious Area 0.250 32.05% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre Developed ON Site Hydrograph ■ Rurwff Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Subcatchment 2S: Pre Developed ON Site Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.21 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.25 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.34 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.54 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.61 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.77 0.00 0.00 11.50 0.85 0.00 0.01 11.75 1.16 0.04 0.13 12.00 2.00 0.29 1.05 12.25 2.13 0.35 0.17 12.50 2.21 0.39 0.12 12.75 2.27 0.42 0.09 13.00 2.32 0.44 0.08 13.25 2.37 0.46 0.07 13.50 2.40 0.48 0.06 13.75 2.44 0.50 0.05 14.00 2.47 0.51 0.05 14.25 2.50 0.53 0.04 14.50 2.52 0.54 0.04 14.75 2.55 0.55 0.04 15.00 2.57 0.56 0.04 15.25 2.59 0.58 0.04 15.50 2.61 0.59 0.03 15.75 2.63 0.60 0.03 16.00 2.65 0.61 0.03 16.25 2.67 0.62 0.03 16.50 2.68 0.63 0.03 16.75 2.70 0.64 0.03 17.00 2.71 0.64 0.03 17.25 2.73 0.65 0.03 17.50 2.74 0.66 0.03 17.75 2.76 0.67 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.77 0.68 0.02 18.25 2.79 0.68 0.02 18.50 2.80 0.69 0.02 18.75 2.81 0.70 0.02 19.00 2.82 0.70 0.02 19.25 2.83 0.71 0.02 19.50 2.85 0.72 0.02 19.75 2.86 0.72 0.02 20.00 2.87 0.73 0.02 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Summary for Subcatchment 4S: Post Offsite Routed Runoff = 3.24 cfs @ 12.03 hrs, Volume= 0.171 af, Depth> 0.60" Printed 12/28/2020 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 1Year Rainfall=3.01" Area (ac) CN 1.320 60 Woods, Fair, HSG B 1.390 61 >75% Grass cover, Good, HSG B 0.740 98 Paved parking, HSG B 3.450 69 Weighted Average 2.710 78.55% Pervious Area 0.740 21.45% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65" 1.9 200 0.0600 1.71 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.4 100 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.0 40 0.0312 16.54 51.95 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.010 PVC. smooth interior 9.7 440 Total ivy Proper Pre-Post_54in Prepared by Timmons Grou .K u Type 1124-hr 1 Year Rainfall=3.01 " Subcatchment 4S: Post Offsite Routed Hydrograph Time (houm) Printed 12/28/2020 ■ Runoff Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Subcatchment 4S: Post Mite Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.21 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.25 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.34 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.54 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.61 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.77 0.00 0.00 11.50 0.85 0.00 0.00 11.75 1.16 0.01 0.12 12.00 2.00 0.22 3.08 12.25 2.13 0.26 0.87 12.50 2.21 0.30 0.50 12.75 2.27 0.32 0.35 13.00 2.32 0.34 0.30 13.25 2.37 0.36 0.26 13.50 2.40 0.38 0.23 13.75 2.44 0.39 0.21 14.00 2.47 0.41 0.19 14.25 2.50 0.42 0.17 14.50 2.52 0.43 0.17 14.75 2.55 0.44 0.16 15.00 2.57 0.45 0.15 15.25 2.59 0.46 0.14 15.50 2.61 0.47 0.14 15.75 2.63 0.48 0.13 16.00 2.65 0.49 0.12 16.25 2.67 0.50 0.12 16.50 2.68 0.51 0.11 16.75 2.70 0.51 0.11 17.00 2.71 0.52 0.11 17.25 2.73 0.53 0.10 17.50 2.74 0.54 0.10 17.75 2.76 0.54 0.10 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.77 0.55 0.10 18.25 2.79 0.56 0.09 18.50 2.80 0.56 0.09 18.75 2.81 0.57 0.09 19.00 2.82 0.58 0.08 19.25 2.83 0.58 0.08 19.50 2.85 0.59 0.08 19.75 2.86 0.59 0.08 20.00 2.87 0.60 0.07 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Summary for Subcatchment 5S: Post ON Site Routed Runoff = 1.94 cfs @ 11.97 hrs, Volume= 0.090 af, Depth> 1.86" Printed 12/28/2020 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 1Year Rainfall=3.01" Area (ac) CN 0.000 60 Woods, Fair, HSG B 0.120 61 >75% Grass cover, Good, HSG B 0.460 98 Paved parking, HSG B 0.580 90 Weighted Average 0.120 20.69% Pervious Area 0.460 79.31% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post ON Site Routed Hydrograph G Runoff Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Subcatchment 5S: Post ON Site Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.21 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.25 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.01 0.00 7.50 0.33 0.01 0.01 7.75 0.34 0.01 0.01 8.00 0.36 0.02 0.01 8.25 0.38 0.02 0.01 8.50 0.40 0.02 0.01 8.75 0.42 0.03 0.01 9.00 0.44 0.04 0.02 9.25 0.47 0.04 0.02 9.50 0.49 0.05 0.02 9.75 0.52 0.06 0.02 10.00 0.54 0.07 0.03 10.25 0.58 0.09 0.03 10.50 0.61 0.10 0.04 10.75 0.66 0.12 0.05 11.00 0.71 0.15 0.06 11.25 0.77 0.18 0.08 11.50 0.85 0.23 0.11 11.75 1.16 0.43 0.57 12.00 2.00 1.09 1.83 12.25 2.13 1.20 0.26 12.50 2.21 1.28 0.17 12.75 2.27 1.33 0.12 13.00 2.32 1.37 0.10 13.25 2.37 1.41 0.09 13.50 2.40 1.45 0.08 13.75 2.44 1.48 0.07 14.00 2.47 1.50 0.06 14.25 2.50 1.53 0.06 14.50 2.52 1.55 0.05 14.75 2.55 1.57 0.05 15.00 2.57 1.59 0.05 15.25 2.59 1.61 0.05 15.50 2.61 1.63 0.04 15.75 2.63 1.65 0.04 16.00 2.65 1.66 0.04 16.25 2.67 1.68 0.04 16.50 2.68 1.69 0.03 16.75 2.70 1.71 0.03 17.00 2.71 1.72 0.03 17.25 2.73 1.74 0.03 17.50 2.74 1.75 0.03 17.75 2.76 1.76 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.77 1.78 0.03 18.25 2.79 1.79 0.03 18.50 2.80 1.80 0.03 18.75 2.81 1.81 0.03 19.00 2.82 1.82 0.03 19.25 2.83 1.83 0.02 19.50 2.85 1.84 0.02 19.75 2.86 1.85 0.02 20.00 2.87 1.86 0.02 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Printed 12/28/2020 Summary for Subcatchment 7S: Post ON Site Unrouted Runoff = 0.35 cfs @ 11.98 hrs, Volume= 0.015 af, Depth> 0.87" 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 1Year Rainfall=3.01" Area (ac) CN Description 0.000 60 Woods, Fair, HSG B 0.130 61 >75% Grass cover, Good, HSG B 0.080 98 Paved parking, HSG B 0.210 75 Weighted Average 0.130 61.90% Pervious Area 0.080 38.10% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, M Subcatchment 7S: Post ON Site Unrouted Hydrograph �__________ MMM ___ -- —__==e 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■ Rurwff Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Subcatchment 7S: Post ON Site Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.21 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.25 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.34 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.54 0.00 0.00 10.25 0.58 0.00 0.00 10.50 0.61 0.00 0.00 10.75 0.66 0.00 0.00 11.00 0.71 0.00 0.00 11.25 0.77 0.00 0.00 11.50 0.85 0.01 0.01 11.75 1.16 0.06 0.06 12.00 2.00 0.38 0.34 12.25 2.13 0.44 0.05 12.50 2.21 0.49 0.04 12.75 2.27 0.52 0.03 13.00 2.32 0.55 0.02 13.25 2.37 0.57 0.02 13.50 2.40 0.60 0.02 13.75 2.44 0.61 0.02 14.00 2.47 0.63 0.01 14.25 2.50 0.65 0.01 14.50 2.52 0.66 0.01 14.75 2.55 0.68 0.01 15.00 2.57 0.69 0.01 15.25 2.59 0.70 0.01 15.50 2.61 0.72 0.01 15.75 2.63 0.73 0.01 16.00 2.65 0.74 0.01 16.25 2.67 0.75 0.01 16.50 2.68 0.76 0.01 16.75 2.70 0.77 0.01 17.00 2.71 0.78 0.01 17.25 2.73 0.79 0.01 17.50 2.74 0.80 0.01 17.75 2.76 0.81 0.01 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.77 0.82 0.01 18.25 2.79 0.82 0.01 18.50 2.80 0.83 0.01 18.75 2.81 0.84 0.01 19.00 2.82 0.85 0.01 19.25 2.83 0.85 0.01 19.50 2.85 0.86 0.01 19.75 2.86 0.87 0.01 20.00 2.87 0.87 0.01 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Summary for Subcatchment 8S: Post Off Site Unrouted Runoff = 1.39 cfs @ 11.97 hrs, Volume= 0.061 af, Depth> 1.27" Printed 12/28/2020 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 1Year Rainfall=3.01" Area (ac) CN 0.150 60 Woods, Fair, HSG B 0.090 61 >75% Grass cover, Good, HSG B 0.340 98 Paved parking, HSG B 0.580 82 Weighted Average 0.240 41.38% Pervious Area 0.340 58.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post Off Site Unrouted Hydrograph ■ Rurwff Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Subcatchment 8S: Post Off Site Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.19 0.00 0.00 5.25 0.20 0.00 0.00 5.50 0.21 0.00 0.00 5.75 0.23 0.00 0.00 6.00 0.24 0.00 0.00 6.25 0.25 0.00 0.00 6.50 0.27 0.00 0.00 6.75 0.28 0.00 0.00 7.00 0.30 0.00 0.00 7.25 0.31 0.00 0.00 7.50 0.33 0.00 0.00 7.75 0.34 0.00 0.00 8.00 0.36 0.00 0.00 8.25 0.38 0.00 0.00 8.50 0.40 0.00 0.00 8.75 0.42 0.00 0.00 9.00 0.44 0.00 0.00 9.25 0.47 0.00 0.00 9.50 0.49 0.00 0.00 9.75 0.52 0.00 0.00 10.00 0.54 0.00 0.01 10.25 0.58 0.01 0.01 10.50 0.61 0.01 0.01 10.75 0.66 0.02 0.02 11.00 0.71 0.03 0.02 11.25 0.77 0.04 0.04 11.50 0.85 0.07 0.05 11.75 1.16 0.18 0.32 12.00 2.00 0.65 1.34 12.25 2.13 0.73 0.20 12.50 2.21 0.79 0.13 12.75 2.27 0.83 0.10 13.00 2.32 0.87 0.08 13.25 2.37 0.90 0.07 13.50 2.40 0.93 0.06 13.75 2.44 0.95 0.06 14.00 2.47 0.97 0.05 14.25 2.50 0.99 0.05 14.50 2.52 1.01 0.04 14.75 2.55 1.03 0.04 15.00 2.57 1.05 0.04 15.25 2.59 1.07 0.04 15.50 2.61 1.08 0.04 15.75 2.63 1.10 0.03 16.00 2.65 1.11 0.03 16.25 2.67 1.12 0.03 16.50 2.68 1.13 0.03 16.75 2.70 1.15 0.03 17.00 2.71 1.16 0.03 17.25 2.73 1.17 0.03 17.50 2.74 1.18 0.03 17.75 2.76 1.19 0.03 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 2.77 1.20 0.02 18.25 2.79 1.21 0.02 18.50 2.80 1.22 0.02 18.75 2.81 1.23 0.02 19.00 2.82 1.24 0.02 19.25 2.83 1.25 0.02 19.50 2.85 1.26 0.02 19.75 2.86 1.27 0.02 20.00 2.87 1.27 0.02 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 11 24-hr 1Year Rainfall=3.01" Summary for Pond 6P: (new Pond) Printed 12/28/2020 Inflow Area = 4.030 ac, 29.78% Impervious, Inflow Depth > 0.78" for 1Year event Inflow = 4.91 cfs @ 12.00 hrs, Volume= 0.261 of Outflow = 3.42 cfs @ 12.09 hrs, Volume= 0.261 af, Atten= 30%, Lag= 5.2 min Primary = 3.42 cfs @ 12.09 hrs, Volume= 0.261 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 515.06' @ 12.09 hrs Surf.Area= 0.019 ac Storage= 0.029 of Plug -Flow detention time= 4.8 min calculated for 0.261 of (100% of inflow) Center -of -Mass det. time= 3.7 min ( 810.9 - 807.2 ) Volume Invert Avail.Storage Storage Description #1 513.00' 0.066 of 54.0" Round Pipe Storage L= 180.0' Device Routing Invert Outlet Devices #1 Primary 513.00' 10.0" Vert. Orifice/Grate C= 0.600 #2 Primary 515.00' 16.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #3 Primary 517.10' 2.6' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=3.38 cfs @ 12.09 hrs HW=515.04' (Free Discharge) �1=Orifice/Grate (Orifice Controls 3.35 cfs @ 6.13 fps) 2=Orifice/Grate (Orifice Controls 0.03 cfs @ 0.64 fps) 3=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Y' V Pond 6P: (new Pond) Hydrograph Time (hours) ❑ Inflow ❑ Primary ivy Proper Pre-Post_54in Prepared by Timmons Grou w Pond 6P: (new Pond) Stage -Discharge Discharge (cfs) Pond 6P: (new Pond) Stage -Area -Storage Storage (acre-feet) Type 11 24-hr 1 Year Rainfall=3.01 " Printed 12/28/2020 ■ Storage Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Pond 6P: (new Pond) Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 5.00 0.00 0.000 513.00 0.00 5.50 0.00 0.000 513.00 0.00 6.00 0.00 0.000 513.00 0.00 6.50 0.00 0.000 513.01 0.00 7.00 0.00 0.000 513.02 0.00 7.50 0.01 0.000 513.03 0.01 8.00 0.01 0.000 513.04 0.01 8.50 0.01 0.000 513.05 0.01 9.00 0.02 0.000 513.06 0.02 9.50 0.02 0.000 513.06 0.02 10.00 0.03 0.000 513.08 0.02 10.50 0.04 0.000 513.09 0.04 11.00 0.06 0.000 513.12 0.06 11.50 0.11 0.001 513.16 0.10 12.00 4.90 0.022 514.64 2.91 12.50 0.66 0.004 513.47 0.75 13.00 0.40 0.002 513.34 0.42 13.50 0.31 0.002 513.29 0.32 14.00 0.25 0.002 513.26 0.25 14.50 0.22 0.001 513.24 0.22 15.00 0.20 0.001 513.23 0.20 15.50 0.18 0.001 513.22 0.18 16.00 0.16 0.001 513.20 0.16 16.50 0.15 0.001 513.20 0.15 17.00 0.14 0.001 513.19 0.14 17.50 0.13 0.001 513.19 0.13 18.00 0.13 0.001 513.18 0.13 18.50 0.12 0.001 513.17 0.12 19.00 0.11 0.001 513.17 0.11 19.50 0.10 0.001 513.16 0.10 20.00 0.09 0.001 513.15 0.09 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Elevation Primary (feet) (cfs) 513.00 0.00 513.05 0.01 513.10 0.04 513.15 0.09 513.20 0.15 513.25 0.23 513.30 0.33 513.35 0.44 513.40 0.56 513.45 0.69 513.50 0.82 513.55 0.96 513.60 1.11 513.65 1.25 513.70 1.39 513.75 1.52 513.80 1.64 513.85 1.73 513.90 1.83 513.95 1.92 514.00 2.01 514.05 2.09 514.10 2.17 514.15 2.25 514.20 2.32 514.25 2.40 514.30 2.47 514.35 2.54 514.40 2.60 514.45 2.67 514.50 2.73 514.55 2.80 514.60 2.86 514.65 2.92 514.70 2.98 514.75 3.03 514.80 3.09 514.85 3.14 514.90 3.20 514.95 3.25 515.00 3.30 515.05 3.40 515.10 3.54 515.15 3.71 515.20 3.89 515.25 4.09 515.30 4.31 515.35 4.54 515.40 4.78 515.45 5.04 515.50 5.30 515.55 5.58 Type 1124-hr 1Year Rainfall=3.01" Stage -Discharge for Pond 6P: (new Pond) Elevation Primary (feet) (cfs) 515.60 5.87 515.65 6.17 515.70 6.47 515.75 6.79 515.80 7.12 515.85 7.45 515.90 7.79 515.95 8.14 516.00 8.50 516.05 8.82 516.10 9.10 516.15 9.37 516.20 9.62 516.25 9.87 516.30 10.10 516.35 10.32 516.40 10.54 516.45 10.75 516.50 10.96 516.55 11.16 516.60 11.36 516.65 11.55 516.70 11.74 516.75 11.92 516.80 12.10 516.85 12.28 516.90 12.46 516.95 12.63 517.00 12.80 517.05 12.96 517.10 13.13 517.15 13.38 517.20 13.71 517.25 14.09 517.30 14.51 517.35 14.96 517.40 15.43 517.45 15.93 517.50 16.45 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Elevation Storage (feet) (acre-feet) 513.00 0.000 513.05 0.000 513.10 0.000 513.15 0.001 513.20 0.001 513.25 0.001 513.30 0.002 513.35 0.002 513.40 0.003 513.45 0.003 513.50 0.004 513.55 0.005 513.60 0.005 513.65 0.006 513.70 0.007 513.75 0.007 513.80 0.008 513.85 0.009 513.90 0.009 513.95 0.010 514.00 0.011 514.05 0.012 514.10 0.012 514.15 0.013 514.20 0.014 514.25 0.015 514.30 0.016 514.35 0.017 514.40 0.017 514.45 0.018 514.50 0.019 514.55 0.020 514.60 0.021 514.65 0.022 514.70 0.023 514.75 0.024 514.80 0.025 514.85 0.025 514.90 0.026 514.95 0.027 515.00 0.028 515.05 0.029 515.10 0.030 515.15 0.031 515.20 0.032 515.25 0.033 515.30 0.034 515.35 0.035 515.40 0.036 515.45 0.037 515.50 0.037 515.55 0.038 Type 1124-hr 1Year Rainfall=3.01" Stage -Area -Storage for Pond 6P: (new Pond) Elevation Storage (feet) (acre-feet) 515.60 0.039 515.65 0.040 515.70 0.041 515.75 0.042 515.80 0.043 515.85 0.044 515.90 0.045 515.95 0.046 516.00 0.047 516.05 0.047 516.10 0.048 516.15 0.049 516.20 0.050 516.25 0.051 516.30 0.052 516.35 0.052 516.40 0.053 516.45 0.054 516.50 0.055 516.55 0.056 516.60 0.056 516.65 0.057 516.70 0.058 516.75 0.059 516.80 0.059 516.85 0.060 516.90 0.061 516.95 0.061 517.00 0.062 517.05 0.062 517.10 0.063 517.15 0.063 517.20 0.064 517.25 0.064 517.30 0.065 517.35 0.065 517.40 0.065 517.45 0.066 517.50 0.066 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Summary for Link 3L: PRE Type 1124-hr 1Year Rainfall=3.01" Printed 12/28/2020 Inflow Area = 4.810 ac, 27.65% Impervious, Inflow Depth > 0.69" for 1Year event Inflow = 5.38 cfs @ 12.02 hrs, Volume= 0.276 of Primary = 5.38 cfs @ 12.02 hrs, Volume= 0.276 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 3L: PRE Hydrograph ■ Inflow ■ Primary Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Hydrograph for Link 3L: PRE Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.25 0.00 0.00 0.00 7.50 0.00 0.00 0.00 7.75 0.00 0.00 0.00 8.00 0.00 0.00 0.00 8.25 0.00 0.00 0.00 8.50 0.00 0.00 0.00 8.75 0.00 0.00 0.00 9.00 0.00 0.00 0.00 9.25 0.00 0.00 0.00 9.50 0.00 0.00 0.00 9.75 0.00 0.00 0.00 10.00 0.00 0.00 0.00 10.25 0.00 0.00 0.00 10.50 0.00 0.00 0.00 10.75 0.00 0.00 0.00 11.00 0.00 0.00 0.00 11.25 0.00 0.00 0.00 11.50 0.01 0.00 0.01 11.75 0.44 0.00 0.44 12.00 5.31 0.00 5.31 12.25 1.31 0.00 1.31 12.50 0.76 0.00 0.76 12.75 0.54 0.00 0.54 13.00 0.46 0.00 0.46 13.25 0.40 0.00 0.40 13.50 0.36 0.00 0.36 13.75 0.32 0.00 0.32 14.00 0.29 0.00 0.29 14.25 0.26 0.00 0.26 14.50 0.25 0.00 0.25 14.75 0.24 0.00 0.24 15.00 0.23 0.00 0.23 15.25 0.22 0.00 0.22 15.50 0.21 0.00 0.21 15.75 0.20 0.00 0.20 16.00 0.18 0.00 0.18 16.25 0.18 0.00 0.18 16.50 0.17 0.00 0.17 16.75 0.17 0.00 0.17 17.00 0.16 0.00 0.16 17.25 0.16 0.00 0.16 17.50 0.15 0.00 0.15 17.75 0.15 0.00 0.15 Type 1124-hr 1Year Rainfall=3.01" Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.15 0.00 0.15 18.25 0.14 0.00 0.14 18.50 0.14 0.00 0.14 18.75 0.13 0.00 0.13 19.00 0.13 0.00 0.13 19.25 0.12 0.00 0.12 19.50 0.12 0.00 0.12 19.75 0.11 0.00 0.11 20.00 0.11 0.00 0.11 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Printed 12/28/2020 Summary for Link 9L: (new Link) Inflow Area = 4.820 ac, 33.61 % Impervious, Inflow Depth > 0.84" for 1Year event Inflow = 4.61 cfs @ 12.01 hrs, Volume= 0.337 of Primary = 4.61 cfs @ 12.01 hrs, Volume= 0.337 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 9L: (new Link) Hydrograph ■ Inflow ■ Primary Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 1Year Rainfall=3.01" Hydrograph for Link 9L: (new Link) Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.25 0.00 0.00 0.00 7.50 0.01 0.00 0.01 7.75 0.01 0.00 0.01 8.00 0.01 0.00 0.01 8.25 0.01 0.00 0.01 8.50 0.01 0.00 0.01 8.75 0.01 0.00 0.01 9.00 0.02 0.00 0.02 9.25 0.02 0.00 0.02 9.50 0.02 0.00 0.02 9.75 0.02 0.00 0.02 10.00 0.03 0.00 0.03 10.25 0.04 0.00 0.04 10.50 0.05 0.00 0.05 10.75 0.06 0.00 0.06 11.00 0.08 0.00 0.08 11.25 0.11 0.00 0.11 11.50 0.16 0.00 0.16 11.75 0.85 0.00 0.85 12.00 4.58 0.00 4.58 12.25 2.64 0.00 2.64 12.50 0.92 0.00 0.92 12.75 0.62 0.00 0.62 13.00 0.52 0.00 0.52 13.25 0.45 0.00 0.45 13.50 0.40 0.00 0.40 13.75 0.36 0.00 0.36 14.00 0.32 0.00 0.32 14.25 0.29 0.00 0.29 14.50 0.28 0.00 0.28 14.75 0.27 0.00 0.27 15.00 0.25 0.00 0.25 15.25 0.24 0.00 0.24 15.50 0.23 0.00 0.23 15.75 0.22 0.00 0.22 16.00 0.20 0.00 0.20 16.25 0.19 0.00 0.19 16.50 0.19 0.00 0.19 16.75 0.18 0.00 0.18 17.00 0.18 0.00 0.18 17.25 0.17 0.00 0.17 17.50 0.17 0.00 0.17 17.75 0.16 0.00 0.16 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.16 0.00 0.16 18.25 0.15 0.00 0.15 18.50 0.15 0.00 0.15 18.75 0.14 0.00 0.14 19.00 0.14 0.00 0.14 19.25 0.13 0.00 0.13 19.50 0.13 0.00 0.13 19.75 0.12 0.00 0.12 20.00 0.12 0.00 0.12 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Summary for Subcatchment 1S: Pre Developed Offsite Runoff = 15.44 cfs @ 12.01 hrs, Volume= 0.769 af, Depth> 2.29" Printed 12/28/2020 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 10Year Rainfall=5.50" Area (ac) CN 1.470 60 Woods, Fair, HSG B 1.480 61 >75% Grass cover, Good, HSG B 1.080 98 Paved parking, HSG B 4.030 71 Weighted Average 2.950 73.20% Pervious Area 1.080 26.80% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65" 1.9 200 0.0600 1.71 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.4 100 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.0 40 0.0312 16.54 51.95 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.010 PVC. smooth interior 9.7 440 Total ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Printed 12/28/2020 Subcatchment 1S: Pre Developed Offsite Hydrograph ❑ Runoff Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Subcatchment 1S: Pre Developed Offsite Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 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 0.69 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 0.85 0.00 0.00 9.50 0.90 0.00 0.02 9.75 0.94 0.00 0.03 10.00 1.00 0.01 0.06 10.25 1.05 0.01 0.09 10.50 1.12 0.02 0.13 10.75 1.20 0.03 0.18 11.00 1.29 0.05 0.26 11.25 1.41 0.07 0.39 11.50 1.56 0.11 0.60 11.75 2.13 0.32 2.81 12.00 3.65 1.16 15.27 12.25 3.88 1.32 3.45 12.50 4.04 1.42 1.84 12.75 4.15 1.50 1.28 13.00 4.25 1.56 1.08 13.25 4.33 1.62 0.92 13.50 4.39 1.67 0.82 13.75 4.46 1.71 0.72 14.00 4.51 1.75 0.65 14.25 4.56 1.79 0.59 14.50 4.61 1.82 0.56 14.75 4.65 1.86 0.54 15.00 4.69 1.89 0.51 15.25 4.73 1.92 0.48 15.50 4.77 1.95 0.46 15.75 4.81 1.97 0.43 16.00 4.84 2.00 0.40 16.25 4.87 2.02 0.38 16.50 4.90 2.04 0.37 16.75 4.93 2.06 0.36 17.00 4.96 2.09 0.35 17.25 4.99 2.11 0.34 17.50 5.01 2.13 0.33 17.75 5.04 2.15 0.32 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.07 2.17 0.31 18.25 5.09 2.18 0.30 18.50 5.11 2.20 0.29 18.75 5.14 2.22 0.28 19.00 5.16 2.24 0.27 19.25 5.18 2.25 0.26 19.50 5.20 2.27 0.25 19.75 5.22 2.28 0.24 20.00 5.24 2.30 0.23 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Summary for Subcatchment 2S: Pre Developed ON Site Runoff = 3.48 cfs @ 11.97 hrs, Volume= 0.155 af, Depth> 2.38" Printed 12/28/2020 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 Mear Rainfall=5.50" Area (ac) CN 0.520 60 Woods, Fair, HSG B 0.010 61 >75% Grass cover, Good, HSG B 0.250 98 Paved parking, HSG B 0.780 72 Weighted Average 0.530 67.95% Pervious Area 0.250 32.05% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 2S: Pre Developed ON Site Hydrograph ■ Rurwff Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Subcatchment 2S: Pre Developed ON Site Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 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 0.69 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 0.85 0.00 0.00 9.50 0.90 0.00 0.01 9.75 0.94 0.01 0.01 10.00 1.00 0.01 0.02 10.25 1.05 0.02 0.02 10.50 1.12 0.03 0.03 10.75 1.20 0.04 0.04 11.00 1.29 0.06 0.06 11.25 1.41 0.09 0.09 11.50 1.56 0.13 0.14 11.75 2.13 0.35 0.83 12.00 3.65 1.22 3.36 12.25 3.88 1.38 0.50 12.50 4.04 1.49 0.33 12.75 4.15 1.57 0.24 13.00 4.25 1.63 0.20 13.25 4.33 1.69 0.18 13.50 4.39 1.74 0.16 13.75 4.46 1.79 0.14 14.00 4.51 1.83 0.12 14.25 4.56 1.86 0.12 14.50 4.61 1.90 0.11 14.75 4.65 1.93 0.10 15.00 4.69 1.97 0.10 15.25 4.73 2.00 0.09 15.50 4.77 2.02 0.09 15.75 4.81 2.05 0.08 16.00 4.84 2.08 0.08 16.25 4.87 2.10 0.07 16.50 4.90 2.12 0.07 16.75 4.93 2.14 0.07 17.00 4.96 2.17 0.07 17.25 4.99 2.19 0.07 17.50 5.01 2.21 0.06 17.75 5.04 2.23 0.06 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.07 2.25 0.06 18.25 5.09 2.27 0.06 18.50 5.11 2.29 0.06 18.75 5.14 2.30 0.05 19.00 5.16 2.32 0.05 19.25 5.18 2.34 0.05 19.50 5.20 2.35 0.05 19.75 5.22 2.37 0.05 20.00 5.24 2.38 0.04 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Summary for Subcatchment 4S: Post Offsite Routed Runoff = 12.28 cfs @ 12.02 hrs, Volume= 0.611 af, Depth> 2.12" Printed 12/28/2020 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 10Year Rainfall=5.50" Area (ac) CN 1.320 60 Woods, Fair, HSG B 1.390 61 >75% Grass cover, Good, HSG B 0.740 98 Paved parking, HSG B 3.450 69 Weighted Average 2.710 78.55% Pervious Area 0.740 21.45% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 100 0.0500 0.26 Sheet Flow, Grass: Short n= 0.150 P2= 3.65" 1.9 200 0.0600 1.71 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 1.4 100 0.0600 1.22 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 0.0 40 0.0312 16.54 51.95 Pipe Channel, 24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50' n= 0.010 PVC. smooth interior 9.7 440 Total ivy Proper Pre-Post_54in Prepared by Timmons Grou Type I/ 24-hr 10Year Rainfa&5.50" Printed 12/28/2020 Subcatchment 4S: Post Offsite Routed Hydrograph 9,.,. 10 11 ....12 .....13 14 ..... .. ...15 .....16 .....17 .....18 .. ...19 .. ... 20 Time (hours) ■ Rurwff Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Subcatchment 4S: Post Mite Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 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 0.69 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 0.85 0.00 0.00 9.50 0.90 0.00 0.00 9.75 0.94 0.00 0.01 10.00 1.00 0.00 0.02 10.25 1.05 0.01 0.04 10.50 1.12 0.01 0.07 10.75 1.20 0.02 0.11 11.00 1.29 0.03 0.17 11.25 1.41 0.05 0.27 11.50 1.56 0.08 0.43 11.75 2.13 0.26 2.10 12.00 3.65 1.04 12.12 12.25 3.88 1.19 2.79 12.50 4.04 1.29 1.50 12.75 4.15 1.37 1.04 13.00 4.25 1.43 0.88 13.25 4.33 1.48 0.75 13.50 4.39 1.53 0.67 13.75 4.46 1.57 0.59 14.00 4.51 1.61 0.53 14.25 4.56 1.64 0.48 14.50 4.61 1.68 0.46 14.75 4.65 1.71 0.44 15.00 4.69 1.74 0.42 15.25 4.73 1.77 0.40 15.50 4.77 1.79 0.37 15.75 4.81 1.82 0.35 16.00 4.84 1.84 0.33 16.25 4.87 1.86 0.31 16.50 4.90 1.89 0.30 16.75 4.93 1.91 0.30 17.00 4.96 1.93 0.29 17.25 4.99 1.95 0.28 17.50 5.01 1.97 0.27 17.75 5.04 1.99 0.26 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.07 2.01 0.26 18.25 5.09 2.02 0.25 18.50 5.11 2.04 0.24 18.75 5.14 2.06 0.23 19.00 5.16 2.07 0.22 19.25 5.18 2.09 0.22 19.50 5.20 2.10 0.21 19.75 5.22 2.12 0.20 20.00 5.24 2.13 0.19 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Printed 12/28/2020 Summary for Subcatchment 5S: Post ON Site Routed Runoff = 4.05 cfs @ 11.96 hrs, Volume= 0.198 af, Depth> 4.09" 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 10Year Rainfall=5.50" Area (ac) CN Description 0.000 60 Woods, Fair, HSG B 0.120 61 >75% Grass cover, Good, HSG B 0.460 98 Paved parking, HSG B 0.580 90 Weighted Average 0.120 20.69% Pervious Area 0.460 79.31% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 5S: Post ON Site Routed Hydrograph __. 405 cfs Moir Runoff Volum RtinO Ty airfall a 124 5. hr 0" D Tc=6.0 =0.198 pth 4. of 9" min N= 0 6 7 8 9 10....1,1 12 (hours�...1,4....1,5... 16....1,7.. 18 19 20 T ■ Rurgff Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Subcatchment 5S: Post ON Site Routed Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.01 0.01 5.25 0.37 0.02 0.01 5.50 0.39 0.02 0.01 5.75 0.42 0.03 0.01 6.00 0.44 0.04 0.02 6.25 0.47 0.04 0.02 6.50 0.49 0.05 0.02 6.75 0.52 0.06 0.02 7.00 0.54 0.07 0.02 7.25 0.57 0.08 0.03 7.50 0.60 0.10 0.03 7.75 0.63 0.11 0.03 8.00 0.66 0.12 0.03 8.25 0.69 0.14 0.04 8.50 0.73 0.16 0.04 8.75 0.77 0.18 0.05 9.00 0.81 0.20 0.06 9.25 0.85 0.23 0.06 9.50 0.90 0.25 0.06 9.75 0.94 0.28 0.07 10.00 1.00 0.32 0.08 10.25 1.05 0.36 0.09 10.50 1.12 0.40 0.11 10.75 1.20 0.46 0.13 11.00 1.29 0.53 0.16 11.25 1.41 0.61 0.21 11.50 1.56 0.73 0.28 11.75 2.13 1.20 1.33 12.00 3.65 2.59 3.77 12.25 3.88 2.81 0.51 12.50 4.04 2.96 0.33 12.75 4.15 3.06 0.24 13.00 4.25 3.15 0.20 13.25 4.33 3.23 0.17 13.50 4.39 3.29 0.15 13.75 4.46 3.35 0.13 14.00 4.51 3.41 0.12 14.25 4.56 3.45 0.11 14.50 4.61 3.50 0.11 14.75 4.65 3.54 0.10 15.00 4.69 3.58 0.09 15.25 4.73 3.62 0.09 15.50 4.77 3.66 0.08 15.75 4.81 3.69 0.08 16.00 4.84 3.72 0.07 16.25 4.87 3.75 0.07 16.50 4.90 3.78 0.07 16.75 4.93 3.81 0.07 17.00 4.96 3.84 0.06 17.25 4.99 3.86 0.06 17.50 5.01 3.89 0.06 17.75 5.04 3.92 0.06 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.07 3.94 0.06 18.25 5.09 3.96 0.05 18.50 5.11 3.99 0.05 18.75 5.14 4.01 0.05 19.00 5.16 4.03 0.05 19.25 5.18 4.05 0.05 19.50 5.20 4.07 0.05 19.75 5.22 4.09 0.04 20.00 5.24 4.10 0.04 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Summary for Subcatchment 7S: Post ON Site Unrouted Runoff = 1.03 cfs @ 11.97 hrs, Volume= 0.046 af, Depth> 2.64" Printed 12/28/2020 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 Mear Rainfall=5.50" Area (ac) CN 0.000 60 Woods, Fair, HSG B 0.130 61 >75% Grass cover, Good, HSG B 0.080 98 Paved parking, HSG B 0.210 75 Weighted Average 0.130 61.90% Pervious Area 0.080 38.10% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 7S: Post ON Site Unrouted Hydrograph ❑ RunoH Type II 24-hr 10Year Rainfall=5.50" Runoff Area=0.210 ac Runoff Volume=0.046 of Runoff Depth>2.64" Tc=6.0 min CN=75 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Subcatchment 7S: Post ON Site Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.00 7.25 0.57 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 0.69 0.00 0.00 8.50 0.73 0.00 0.00 8.75 0.77 0.00 0.00 9.00 0.81 0.01 0.00 9.25 0.85 0.01 0.00 9.50 0.90 0.01 0.00 9.75 0.94 0.02 0.01 10.00 1.00 0.03 0.01 10.25 1.05 0.04 0.01 10.50 1.12 0.05 0.01 10.75 1.20 0.07 0.02 11.00 1.29 0.10 0.02 11.25 1.41 0.13 0.03 11.50 1.56 0.19 0.05 11.75 2.13 0.45 0.26 12.00 3.65 1.41 0.99 12.25 3.88 1.58 0.14 12.50 4.04 1.70 0.09 12.75 4.15 1.78 0.07 13.00 4.25 1.85 0.06 13.25 4.33 1.91 0.05 13.50 4.39 1.97 0.04 13.75 4.46 2.02 0.04 14.00 4.51 2.06 0.04 14.25 4.56 2.10 0.03 14.50 4.61 2.13 0.03 14.75 4.65 2.17 0.03 15.00 4.69 2.20 0.03 15.25 4.73 2.24 0.03 15.50 4.77 2.27 0.03 15.75 4.81 2.29 0.02 16.00 4.84 2.32 0.02 16.25 4.87 2.35 0.02 16.50 4.90 2.37 0.02 16.75 4.93 2.39 0.02 17.00 4.96 2.42 0.02 17.25 4.99 2.44 0.02 17.50 5.01 2.46 0.02 17.75 5.04 2.48 0.02 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.07 2.50 0.02 18.25 5.09 2.52 0.02 18.50 5.11 2.54 0.02 18.75 5.14 2.56 0.02 19.00 5.16 2.58 0.01 19.25 5.18 2.59 0.01 19.50 5.20 2.61 0.01 19.75 5.22 2.63 0.01 20.00 5.24 2.64 0.01 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Summary for Subcatchment 8S: Post Off Site Unrouted Runoff = 3.45 cfs @ 11.97 hrs, Volume= 0.159 af, Depth> 3.29" Printed 12/28/2020 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 Mear Rainfall=5.50" Area (ac) CN 0.150 60 Woods, Fair, HSG B 0.090 61 >75% Grass cover, Good, HSG B 0.340 98 Paved parking, HSG B 0.580 82 Weighted Average 0.240 41.38% Pervious Area 0.340 58.62% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 8S: Post Off Site Unrouted Hydrograph ❑ RunoH Type II 24-hr 10Year Rainfall=5.50" Runoff Area=0.580 ac Runoff Volume=0.159 of Runoff Depth>3.29" Tc=6.0 min CN=82 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Subcatchment 8S: Post Off Site Unrouted Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 5.00 0.35 0.00 0.00 5.25 0.37 0.00 0.00 5.50 0.39 0.00 0.00 5.75 0.42 0.00 0.00 6.00 0.44 0.00 0.00 6.25 0.47 0.00 0.00 6.50 0.49 0.00 0.00 6.75 0.52 0.00 0.00 7.00 0.54 0.00 0.01 7.25 0.57 0.01 0.01 7.50 0.60 0.01 0.01 7.75 0.63 0.02 0.01 8.00 0.66 0.02 0.01 8.25 0.69 0.03 0.01 8.50 0.73 0.03 0.02 8.75 0.77 0.04 0.02 9.00 0.81 0.05 0.03 9.25 0.85 0.07 0.03 9.50 0.90 0.08 0.03 9.75 0.94 0.09 0.04 10.00 1.00 0.11 0.04 10.25 1.05 0.13 0.05 10.50 1.12 0.16 0.07 10.75 1.20 0.20 0.08 11.00 1.29 0.24 0.10 11.25 1.41 0.30 0.14 11.50 1.56 0.38 0.19 11.75 2.13 0.73 1.00 12.00 3.65 1.90 3.26 12.25 3.88 2.10 0.46 12.50 4.04 2.24 0.30 12.75 4.15 2.33 0.22 13.00 4.25 2.41 0.18 13.25 4.33 2.48 0.16 13.50 4.39 2.54 0.14 13.75 4.46 2.60 0.12 14.00 4.51 2.64 0.11 14.25 4.56 2.69 0.10 14.50 4.61 2.73 0.10 14.75 4.65 2.77 0.09 15.00 4.69 2.81 0.09 15.25 4.73 2.84 0.08 15.50 4.77 2.88 0.08 15.75 4.81 2.91 0.07 16.00 4.84 2.94 0.07 16.25 4.87 2.96 0.06 16.50 4.90 2.99 0.06 16.75 4.93 3.02 0.06 17.00 4.96 3.04 0.06 17.25 4.99 3.07 0.06 17.50 5.01 3.09 0.06 17.75 5.04 3.12 0.05 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 18.00 5.07 3.14 0.05 18.25 5.09 3.16 0.05 18.50 5.11 3.18 0.05 18.75 5.14 3.20 0.05 19.00 5.16 3.22 0.05 19.25 5.18 3.24 0.04 19.50 5.20 3.26 0.04 19.75 5.22 3.27 0.04 20.00 5.24 3.29 0.04 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Summary for Pond 6P: (new Pond) Printed 12/28/2020 Inflow Area = 4.030 ac, 29.78% Impervious, Inflow Depth > 2.41" for 10Year event Inflow = 15.89 cfs @ 12.00 hrs, Volume= 0.808 of Outflow = 15.45 cfs @ 12.04 hrs, Volume= 0.807 af, Atten= 3%, Lag= 2.2 min Primary = 15.45 cfs @ 12.04 hrs, Volume= 0.807 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 517.43' @ 12.03 hrs Surf.Area= 0.005 ac Storage= 0.066 of Plug -Flow detention time= 4.1 min calculated for 0.804 of (99% of inflow) Center -of -Mass det. time= 3.3 min ( 791.0 - 787.6 ) Volume Invert Avail.Storage Storage Description #1 513.00' 0.066 of 54.0" Round Pipe Storage L= 180.0' Device Routing Invert Outlet Devices #1 Primary 513.00' 10.0" Vert. Orifice/Grate C= 0.600 #2 Primary 515.00' 16.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #3 Primary 517.10' 2.6' long Sharp -Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=14.99 cfs @ 12.04 hrs HW=517.35' (Free Discharge) �1=Orifice/Grate (Orifice Controls 5.21 cfs @ 9.55 fps) 2=Orifice/Grate (Orifice Controls 8.72 cfs @ 6.54 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 1.07 cfs @ 1.65 fps) Pond 6P: (new Pond) Hydrograph ■ hiflow ■ Primary Time (hours) ivy Proper Pre-Post_54in Prepared by Timmons Grou w Pond 6P: (new Pond) Stage -Discharge Discharge (cfs) Pond 6P: (new Pond) Stage -Area -Storage Storage (acre-feet) Type Il 24-hr 10Year Rainfall=5.50" Printed 12/28/2020 ■ Storage Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Pond 6P: (new Pond) Time Inflow Storage Elevation Primary (hours) (cfs) (acre-feet) (feet) (cfs) 5.00 0.01 0.000 513.01 0.00 5.50 0.01 0.000 513.05 0.01 6.00 0.02 0.000 513.06 0.02 6.50 0.02 0.000 513.07 0.02 7.00 0.02 0.000 513.07 0.02 7.50 0.03 0.000 513.08 0.03 8.00 0.03 0.000 513.09 0.03 8.50 0.04 0.000 513.10 0.04 9.00 0.06 0.000 513.11 0.05 9.50 0.06 0.001 513.12 0.06 10.00 0.10 0.001 513.15 0.09 10.50 0.18 0.001 513.21 0.17 11.00 0.33 0.002 513.29 0.31 11.50 0.71 0.003 513.44 0.66 12.00 15.89 0.064 517.23 13.91 12.50 1.83 0.017 514.38 2.58 13.00 1.08 0.005 513.60 1.12 13.50 0.82 0.004 513.51 0.84 14.00 0.65 0.003 513.44 0.66 14.50 0.57 0.003 513.41 0.57 15.00 0.51 0.003 513.38 0.52 15.50 0.46 0.002 513.36 0.46 16.00 0.40 0.002 513.34 0.41 16.50 0.37 0.002 513.32 0.37 17.00 0.35 0.002 513.31 0.36 17.50 0.33 0.002 513.30 0.34 18.00 0.31 0.002 513.29 0.32 18.50 0.29 0.002 513.28 0.30 19.00 0.27 0.002 513.27 0.27 19.50 0.25 0.002 513.26 0.25 20.00 0.23 0.001 513.25 0.23 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Elevation Primary (feet) (cfs) 513.00 0.00 513.05 0.01 513.10 0.04 513.15 0.09 513.20 0.15 513.25 0.23 513.30 0.33 513.35 0.44 513.40 0.56 513.45 0.69 513.50 0.82 513.55 0.96 513.60 1.11 513.65 1.25 513.70 1.39 513.75 1.52 513.80 1.64 513.85 1.73 513.90 1.83 513.95 1.92 514.00 2.01 514.05 2.09 514.10 2.17 514.15 2.25 514.20 2.32 514.25 2.40 514.30 2.47 514.35 2.54 514.40 2.60 514.45 2.67 514.50 2.73 514.55 2.80 514.60 2.86 514.65 2.92 514.70 2.98 514.75 3.03 514.80 3.09 514.85 3.14 514.90 3.20 514.95 3.25 515.00 3.30 515.05 3.40 515.10 3.54 515.15 3.71 515.20 3.89 515.25 4.09 515.30 4.31 515.35 4.54 515.40 4.78 515.45 5.04 515.50 5.30 515.55 5.58 Type 1124-hr 10Year Rainfall=5.50" Stage -Discharge for Pond 6P: (new Pond) Elevation Primary (feet) (cfs) 515.60 5.87 515.65 6.17 515.70 6.47 515.75 6.79 515.80 7.12 515.85 7.45 515.90 7.79 515.95 8.14 516.00 8.50 516.05 8.82 516.10 9.10 516.15 9.37 516.20 9.62 516.25 9.87 516.30 10.10 516.35 10.32 516.40 10.54 516.45 10.75 516.50 10.96 516.55 11.16 516.60 11.36 516.65 11.55 516.70 11.74 516.75 11.92 516.80 12.10 516.85 12.28 516.90 12.46 516.95 12.63 517.00 12.80 517.05 12.96 517.10 13.13 517.15 13.38 517.20 13.71 517.25 14.09 517.30 14.51 517.35 14.96 517.40 15.43 517.45 15.93 517.50 16.45 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Elevation Storage (feet) (acre-feet) 513.00 0.000 513.05 0.000 513.10 0.000 513.15 0.001 513.20 0.001 513.25 0.001 513.30 0.002 513.35 0.002 513.40 0.003 513.45 0.003 513.50 0.004 513.55 0.005 513.60 0.005 513.65 0.006 513.70 0.007 513.75 0.007 513.80 0.008 513.85 0.009 513.90 0.009 513.95 0.010 514.00 0.011 514.05 0.012 514.10 0.012 514.15 0.013 514.20 0.014 514.25 0.015 514.30 0.016 514.35 0.017 514.40 0.017 514.45 0.018 514.50 0.019 514.55 0.020 514.60 0.021 514.65 0.022 514.70 0.023 514.75 0.024 514.80 0.025 514.85 0.025 514.90 0.026 514.95 0.027 515.00 0.028 515.05 0.029 515.10 0.030 515.15 0.031 515.20 0.032 515.25 0.033 515.30 0.034 515.35 0.035 515.40 0.036 515.45 0.037 515.50 0.037 515.55 0.038 Type 1124-hr 10Year Rainfall=5.50" Stage -Area -Storage for Pond 6P: (new Pond) Elevation Storage (feet) (acre-feet) 515.60 0.039 515.65 0.040 515.70 0.041 515.75 0.042 515.80 0.043 515.85 0.044 515.90 0.045 515.95 0.046 516.00 0.047 516.05 0.047 516.10 0.048 516.15 0.049 516.20 0.050 516.25 0.051 516.30 0.052 516.35 0.052 516.40 0.053 516.45 0.054 516.50 0.055 516.55 0.056 516.60 0.056 516.65 0.057 516.70 0.058 516.75 0.059 516.80 0.059 516.85 0.060 516.90 0.061 516.95 0.061 517.00 0.062 517.05 0.062 517.10 0.063 517.15 0.063 517.20 0.064 517.25 0.064 517.30 0.065 517.35 0.065 517.40 0.065 517.45 0.066 517.50 0.066 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Printed 12/28/2020 Summary for Link 3L: PRE Inflow Area = 4.810 ac, 27.65% Impervious, Inflow Depth > 2.30" for 10Year event Inflow = 18.66 cfs @ 12.01 hrs, Volume= 0.923 of Primary = 18.66 cfs @ 12.01 hrs, Volume= 0.923 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 3L: PRE Hydrograph /_____ ----- ---------------------------------- ----- Time (hours) ■ Inflow ■ Primary Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Link 3L: PRE Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.00 0.00 0.00 5.50 0.00 0.00 0.00 5.75 0.00 0.00 0.00 6.00 0.00 0.00 0.00 6.25 0.00 0.00 0.00 6.50 0.00 0.00 0.00 6.75 0.00 0.00 0.00 7.00 0.00 0.00 0.00 7.25 0.00 0.00 0.00 7.50 0.00 0.00 0.00 7.75 0.00 0.00 0.00 8.00 0.00 0.00 0.00 8.25 0.00 0.00 0.00 8.50 0.00 0.00 0.00 8.75 0.00 0.00 0.00 9.00 0.00 0.00 0.00 9.25 0.01 0.00 0.01 9.50 0.03 0.00 0.03 9.75 0.05 0.00 0.05 10.00 0.07 0.00 0.07 10.25 0.11 0.00 0.11 10.50 0.16 0.00 0.16 10.75 0.23 0.00 0.23 11.00 0.32 0.00 0.32 11.25 0.48 0.00 0.48 11.50 0.74 0.00 0.74 11.75 3.64 0.00 3.64 12.00 18.63 0.00 18.63 12.25 3.95 0.00 3.95 12.50 2.17 0.00 2.17 12.75 1.52 0.00 1.52 13.00 1.28 0.00 1.28 13.25 1.10 0.00 1.10 13.50 0.97 0.00 0.97 13.75 0.86 0.00 0.86 14.00 0.77 0.00 0.77 14.25 0.71 0.00 0.71 14.50 0.67 0.00 0.67 14.75 0.64 0.00 0.64 15.00 0.61 0.00 0.61 15.25 0.58 0.00 0.58 15.50 0.54 0.00 0.54 15.75 0.51 0.00 0.51 16.00 0.48 0.00 0.48 16.25 0.45 0.00 0.45 16.50 0.44 0.00 0.44 16.75 0.43 0.00 0.43 17.00 0.42 0.00 0.42 17.25 0.41 0.00 0.41 17.50 0.40 0.00 0.40 17.75 0.38 0.00 0.38 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.37 0.00 0.37 18.25 0.36 0.00 0.36 18.50 0.35 0.00 0.35 18.75 0.34 0.00 0.34 19.00 0.32 0.00 0.32 19.25 0.31 0.00 0.31 19.50 0.30 0.00 0.30 19.75 0.29 0.00 0.29 20.00 0.27 0.00 0.27 Printed 12/28/2020 Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Printed 12/28/2020 Summary for Link 9L: (new Link) Inflow Area = 4.820 ac, 33.61 % Impervious, Inflow Depth > 2.52" for 10Year event Inflow = 18.48 cfs @ 12.02 hrs, Volume= 1.012 of Primary = 18.48 cfs @ 12.02 hrs, Volume= 1.012 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Link 9L: (new Link) Hydrograph ■ Inflow ■ Primary Time (hours) Ivy Proper Pre-Post_54in Prepared by Timmons Grou Type 1124-hr 10Year Rainfall=5.50" Hydrograph for Link 9L: (new Link) Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 5.00 0.00 0.00 0.00 5.25 0.01 0.00 0.01 5.50 0.01 0.00 0.01 5.75 0.01 0.00 0.01 6.00 0.02 0.00 0.02 6.25 0.02 0.00 0.02 6.50 0.02 0.00 0.02 6.75 0.03 0.00 0.03 7.00 0.03 0.00 0.03 7.25 0.03 0.00 0.03 7.50 0.04 0.00 0.04 7.75 0.04 0.00 0.04 8.00 0.04 0.00 0.04 8.25 0.05 0.00 0.05 8.50 0.06 0.00 0.06 8.75 0.07 0.00 0.07 9.00 0.08 0.00 0.08 9.25 0.09 0.00 0.09 9.50 0.10 0.00 0.10 9.75 0.11 0.00 0.11 10.00 0.14 0.00 0.14 10.25 0.19 0.00 0.19 10.50 0.25 0.00 0.25 10.75 0.33 0.00 0.33 11.00 0.44 0.00 0.44 11.25 0.61 0.00 0.61 11.50 0.90 0.00 0.90 11.75 3.39 0.00 3.39 12.00 18.15 0.00 18.15 12.25 4.89 0.00 4.89 12.50 2.97 0.00 2.97 12.75 1.76 0.00 1.76 13.00 1.36 0.00 1.36 13.25 1.16 0.00 1.16 13.50 1.02 0.00 1.02 13.75 0.91 0.00 0.91 14.00 0.81 0.00 0.81 14.25 0.74 0.00 0.74 14.50 0.70 0.00 0.70 14.75 0.67 0.00 0.67 15.00 0.63 0.00 0.63 15.25 0.60 0.00 0.60 15.50 0.57 0.00 0.57 15.75 0.53 0.00 0.53 16.00 0.50 0.00 0.50 16.25 0.47 0.00 0.47 16.50 0.46 0.00 0.46 16.75 0.45 0.00 0.45 17.00 0.43 0.00 0.43 17.25 0.42 0.00 0.42 17.50 0.41 0.00 0.41 17.75 0.40 0.00 0.40 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 18.00 0.39 0.00 0.39 18.25 0.37 0.00 0.37 18.50 0.36 0.00 0.36 18.75 0.35 0.00 0.35 19.00 0.34 0.00 0.34 19.25 0.32 0.00 0.32 19.50 0.31 0.00 0.31 19.75 0.30 0.00 0.30 20.00 0.28 0.00 0.28 Printed 12/28/2020 Virginia Runoff Reduction Method WOMsheel DEQ Virginia Runoff Reduction Method Re -Development Compliance Spreadsheet - Version 3.0 BMP Design Specifications List: 2013 Draft Stds & Specs Site Summary Project Title: Ivy Proper Date: 44186 Total Rainfall (in): 43 Total Disturbed Acreage: 0.79 Site Land Cover Summary Pre-ReDevelopment Land Cover (acres) A soils B Soils C Soils D Soils Totals %of Total Forest/Open (acres) 0.00 0.52 0.00 0.00 0.52 66 Managed Turf (acres) 1 0.00 0.01 0.00 0.00 0.01 1 Impervious Cover (acres) 1 0.00 0.26 0.00 0.00 0.26 33 0.79 100 Post-ReDevelopment Land Cover (acres) !.soils B Soils C Soils D Soils Totals %of Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.00 0 Managed Turf (acre') 1 0.00 0.25 0.00 0.00 0.25 32 Impervious Cover (acres) 0.00 0.54 0.00 0.00 0.54 68 0.79 100 Site Tv and Land Cover Nutrient Loads Final Post -Development Post Post- Adjusted Pre- (Post-ReDevelopment ReDevelopment Development ReDevelopment &New Impervious) (New Impervious) Site Rv 0.71 0.58 0.95 0.50 Treatment Volume(ft') 2,044 1,078 966 930 TP Load (lb/yr) 1.28 0.68 0.61 0.58 Total TP Load Reduction Required (lb/yr) 0.64 0.15 0.49 Final Post -Development Load (Post-ReDevelopment&New Impervious) Pre- ReDevelopment TN Load (Ib/yr) 9.19 4.32 Pre ReDevelopment Final Post -Development Port-ReDevelopment TP TP Load per acre TP Load per acre Load per acre (lb/acre/yr) (lb/acre/yr) Ib acrer 1.15 1.63 1.33 Summary Prior Virginia Runoff Reduction Method Worksheel _.___._.._.___._..-__-___.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___._.._.___. Site Compliance Summary Maximum% Reduction Required Below 10% Pre-ReDevelopmeat Load Total Runoff Volume Reduction (fit) 0 Total TP Load Reduction Achieved (Ih/yr) 0.00 Total TN Load Reduction Achieved (Ih/yr) 0.00 Remaining Post Development TP Load 1.28 (lh/yr) Remaining TP Load Reduction(16/yr) 086 Required Summary Print Virginia Runoff Reduction Method WOMsheel Drainage Area Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total Forest/Open (acres) 0.00 0.00 0.00 0.00 0.0o coo Managed Turf (acres) 0.00 0.00 0.00 0.00 0.0o coo Impervious Cover (acres) 0.00 0.00 0.00 0.00 0.0o coo Total Area (acres) 0.00 0.00 0.00 0.00 0.00 0.00 Drainage Area Compliance Summary D.A. A D.A. B D.A. C D.A. D D.A. E Total TP Load Reduced (Ib/yr) 0.00 0.00 0.00 D.DD coo 0.00 TN Load Reduced (lb/yr) 0.00 0.00 0.00 D.DD coo 0.00 Summary Print Virginia Runoff Reduction Method! WoMsheel Runoff Volume and CN Calculations ITarget Rainfall EVeot(in) 1 0.00 1 0.00 1 0.00 1 Drainage Areas RV&CN Drainage Area Drainage Area Drainage Area Drainage Area Drainage Area ON 0 0 0 0 0 RR (ft°) 0 0 0 0 0 1-year return period RV wo RR(ws-in) 0.00 0.00 OAO 0.00 0.00 RVw RR (.sin) 0.00 0.00 OAO 0.00 0.00 CN adjusted 0 0 0 0 0 2-year return period RV wo RR(ws-in) 0.00 0.00 OAO 0.00 0.00 RV. RR (wsn) 0.00 0.00 OAO 0.00 0.00 CN adjusted 0 0 0 0 0 10-year return period o0.R (ws-in) 0.00 0.00 0.00 0.00 0.00 PRklw:R0.(wsin) 0.00 0.00 0.00 0.00 0.00 CN adjusted 0 0 0 0 0 Summary Print