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Home My WebLink AboutWPO201700071 Calculations WPO VSMP 2018-04-06 PHONE(434)977-0205 FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Vi ginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. STORMWATER MANAGEMENT CALCULATIONS FOR: OLD TRAIL VILLAGE BLOCK 22 PROJECT LOCATION: WEST OFF OF ROUTE 250, NEIGHBORING THE WEST OF OLD TRAIL DRIVE, ADJACENT TO GOLF DRIVE TMP 55E-01-22-0 PREPARED FOR: MARCH MOUNTAIN PROPETIES LLC CONTACT: DAVE BROCKMAN 1005 HEATHERCROFT CIRCLE, SUITE 100 CROZET, VA 22932 PREPARED BY: JEREMY L. FOX ROUDABUSH, GALE & ASSOCIATES, INC. 914 MONTECELLO RD CHARLOTTESVILLE, VA 22902 DATE : OCTOBER 3, 2017 REVISED : MARCH 5, 2018 ' PPROVEL by the Albemarle Goy., `,omrnunity DevelopmentDeryAn;' Date pile 'd.0k.100k1 PHONE(434)977-0205 FAX(434)296-5220 It� INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART.P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. TABLE OF CONTENTS SECTION 1— ABSTRACT & CONCLUSION SECTION 2— TEMPORARY SEDIMENT BASIN DESIGN & CALCULATIONS SECTION 3— BIORETENTION CALCULATIONS SECTION 4— EXTENDED DETENTION CALCULATIONS PHONE(434)977-0205 �o, FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER.L,.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. ABSTRACT : This report illustrates that the proposed stormwater treatment facility for the development of block 22 in Old Trail Village is in compliance with the overall intention of the approved stormwater management master plan (WP0201600009) . The master plan for Old Trail Village was adopted under the VSMP part IIC stormwater regulations, which in turn grandfathered Old Trail development two additional cycles of permit compliance under these regulations. The intended purpose of the approved stormwater master plan in Old Trail Village was to be able to utilize a surplus of stormwater treatment in areas where site restrictions showed minimal, and in turn, compensate for deficits where site restrictions showed abundant. The stormwater treatment facility in this proposed location envisioned a bioretention facility with a targeted drainage area of 5.82 acres and a minimum required drainage area of 4.38 acres. Water quality requirements have been met for the specifics of this block development based on the approved master plan, and documents/calculations can be found in subsequent pages of this packet. Water quantity requirements have been met by the containment of the 10 year storm event within the proposed facilities in this block. CONCLUSION: The conclusions of this analysis are as follows: • Old Trail Village stormwater master tracking currently has an approved running compliance of 1.40 +/- surplus of treatment. • Due to site restrictions within this block development, an actual drainage area of 4.15 acres was determined after analyzing realistic drainage conditions for the developed site. • Since the 4.15 acres cannot meet the minimum estimated required drainage area of 4.38 acres, a deficit of 0.23 acres will be subtracted to the latest approved running compliance. • Water quality and quantity requirements are met under VSMP part IIC regulations. PHONE(434)977-0205 FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PUNNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER.L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS.L.S. AMMY M.GEORGE,L.A. TEMPORARY SEDIMENT BASIN PRE-DEVELOPMENT CONDITIONS Runoff Hydrograph: TR-55 Tabular Hydrograph Method 2YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 3.68 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) DA-Sed Basin 4.71 61 12.5 10.00 Computed Results: Peak Discharge (Qp) : 2.990 cfs Time to Peak: 12.20 hrs Runoff Volume: 0.14 acre-ft 10YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 5.57 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) DA-Sed Basin 4.71 61 12.5 10.00 Computed Results: Peak Discharge (Qp) : 9.301 cfs Time to Peak: 12.20 hrs Runoff Volume: 0.40 acre-ft PHONE(434)977-0205 FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART.P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS.L.S. AMMY M.GEORGE,L.A. 25YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 6.84 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) DA-Sed Basin 4.71 61 12.5 10.00 Computed Results: Peak Discharge (Qp) : 14.379 cfs Time to Peak: 12.20 hrs Runoff Volume: 0.61 acre-ft POST-DEVELOPMENT CONDITIONS Runoff Hydrograph: TR-55 Tabular Hydrograph Method 2YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 3.68 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) DA-Sed Basin 4.71 86 8.90 6.00 Computed Results: Peak Discharge (Qp) : 14.790 cfs Time to Peak: 12.10 hrs Runoff Volume: 1.46 acre-f 10YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 5.57 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) DA-Sed Basin 4.71 86 8.90 6.00 Computed Results: Peak Discharge (Qp) : 26.210 cfs Time to Peak: 12.10 hrs Runoff Volume: 2.59 acre-ft PHONE(434)977-0205 • FAX(434)296-5220 Elk INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. LAND sURVEYIxG A PROFESSIONAL CORPORATION Serving Virginia Since 1956 ENGINEERING LAND PLANNING 914 MONTICELLO ROAD CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. 25YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 6.84 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) DA-Sed Basin 4.71 86 8.90 6.00 Computed Results: Peak Discharge (Qp) : 34.130 cfs Time to Peak: 12.10 hrs Runoff Volume: 1.16 acre-ft PHONE(434)977-0205 lit; FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON,L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. SEDIMENT BASIN ROUTED CONDITIONS Reservoir Routing: Storage Indication Method 2YR STORM EVENT Results: Inflow Peak Flow: 14.79 cfs Inflow Peak Time: 12.10 hr Routed Peak Flow: 5.28 cfs Routed Peak Time: 12.30 hr Maximum Pond Storage: 0.3021 acre-feet Maximum Pond Elevation: 665.14 ft 10YR STORM EVENT Results: Inflow Peak Flow: 26.21 cfs Inflow Peak Time: 12.10 hr Routed Peak Flow: 21.96 cfs Routed Peak Time: 12.20 hr Maximum Pond Storage: 0.3823 acre-feet Maximum Pond Elevation: 665.60 ft 25YR STORM EVENT Results: Inflow Peak Flow: 34.13 cfs Inflow Peak Time: 12.10 hr Routed Peak Flow: 28.20 cfs Routed Peak Time: 12.10 hr Maximum Pond Storage: 0.3836 acre-feet Maximum Pond Elevation: 665.74 ft PHONE(434)977-0205 Pc* FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER.L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART.P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. SEDIMENT BASIN DESIGN PARAMETERS (SAME AS BMP CONVERSION) Multiple Outlet Design Outflow Total Discharge: 100.7192 cfs Max Water Surface Elevation: 666.50 ft (TOP OF DAM) Tailwater Elevation: 640.00 ft Detention Base Elevation: 0.00 ft Outlet #1: RISER, Drop Pipe Riser Top Elev: 665.00 ft Riser Base Elev: 661.50 ft Riser Diameter: 48.00 in Orifice Coefficient: 0.60 Weir Coefficient: 3.33 Culvert Length: 35.00 ft Culvert Diameter: 24.00 in Culvert Invert In: 660.75 ft Culvert Friction Coefficient: 0.01 Culvert Entrance Loss Coefficient: 0.10 Discharge: 33.31 cfs Outlet #2: SPILLWAY, Weir Shape: Rectangular with Contracted End Crest Length: 20.00 ft Invert Elevation: 666.00 ft Coefficient: 3.33 Number of Openings: 1 Discharge: 65.93 cfs Velocity: 3.30 ft/s Outlet #3: 01, Orifice Shape: Circular Diameter: 5.00 in Invert Elevation: 661.75 ft Coefficient: 0.60 Number of Openings: 1 Discharge: 1.47 cfs Velocity: 10.81 ft/s Stage-Storage Report Sediment Basin 316 CY WET REQUIRED/347 CY DRY REQUIRED @ 664.60 288 CY WET PROVIDED/320 CY DRY PROVIDED @ 665.95 Elev(Ft) Storage(CF) Storage(CY) Storage(Acre-Ft) Area(SF) Area(Acre) 661.500 0.000 0.000 0.000 110.809 0.003 662.000 73.851 2.735 0.002 186.577 0.004 663.000 701.120 25.967 0.016 4318.771 0.099 664.000 5519.739 204.435 0.127 5328.853 0.122 666.000 18335.586 679.096 0.421 7525.504 0.173 668.000 35781.128 1325.227 0.821 9952.567 0.228 670.000 58320.985 2160.036 1.339 12616.211 0.290 PHONE(434)977-0205 FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. BIORETENTION POST-DEVELOPMENT CONDITIONS Runoff Hydrograph: TR-55 Tabular Hydrograph Method 1YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 3.04 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) BIO 4.15 86 8.90 6.00 Computed Results: Peak Discharge (Qp) : 26.211 cfs Time to Peak: 12.10 hrs Runoff Volume: 0.86 acre-ft 2YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 3.68 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) BIO 4.15 86 8.90 6.00 Computed Results: Peak Discharge (Qp) : 14.791 cfs Time to Peak: 12.10 hrs Runoff Volume: 0.49 acre-ft PHONE(434)977-0205 1,1 11 FAX(434)296-5220 °g! INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER.L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE.L.A. 10YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 5.57 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) BIO 4.15 86 8.90 6.00 Computed Results: Peak Discharge (Qp) : 26.211 cfs Time to Peak: 12.10 hrs Runoff Volume: 0.86 acre-ft 100YR STORM EVENT Input Data: Rainfall Distribution Type: Type II Rainfall Depth: 9.14 in Base Flow: 0.000 cfs Ia/P Interpolation: On Subarea Downstream Area CN Tc Tt Name Subareas (acre) (min) (min) BIO 4.15 86 8.90 6.00 Computed Results: Peak Discharge (Qp) : 48.728 cfs Time to Peak: 12.10 hrs Runoff Volume: 1.61 acre-ft PHONE(434)977-0205 FAX(434)296-5220 INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. BIORETENTION ROUTED CONDITIONS Reservoir Routing: Storage Indication Method 2YR STORM EVENT Results: Inflow Peak Flow: 14.79 cfs Inflow Peak Time: 12.10 hr Routed Peak Flow: 2.37 cfs Routed Peak Time: 12.40 hr Maximum Pond Storage: 0.4931 acre-feet Maximum Pond Elevation: 666.00 ft 10YR STORM EVENT Results: Inflow Peak Flow: 26.21 cfs Inflow Peak Time: 12.10 hr Routed Peak Flow: 3.20 cfs Routed Peak Time: 12.50 hr Maximum Pond Storage: 0.6818 acre-feet Maximum Pond Elevation: 666.00 ft 100YR STORM EVENT Results: Inflow Peak Flow: 48.73 cfs Inflow Peak Time: 12.10 hr Routed Peak Flow: 4.97 cfs Routed Peak Time: 12.60 hr Maximum Pond Storage: 1.0542 acre-feet Maximum Pond Elevation: 666.00 ft PHONE(434)977-0205 FAX(434)296-5220 °m INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER,L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART.P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. BIORETENTION DESIGN PARAMETERS Multiple Outlet Design Outflow Total Discharge: 2.5045 cfs Max Water Surface Elevation: 666.00 ft Tailwater Elevation: 661.50 ft Detention Base Elevation: 0.00 ft Outlet #1: BIO EXFILTRATE, Exfiltration Area Type: Pond Wetted Area Exfiltration Velocity: 1.50 in/hr Invert Elevation: 662.00 ft Exfiltration Discharge: 0.00 cfs Outlet #2: BIO STANDPIPE, Drop Pipe Riser Top Elev: 666.00 ft Riser Base Elev: 662.00 ft Riser Diameter: 18.00 in Orifice Coefficient: 0.60 Weir Coefficient: 3.33 Culvert Length: 30.00 ft Culvert Diameter: 6.00 in Culvert Invert In: 661.75 ft Culvert Friction Coefficient: 0.01 Culvert Entrance Loss Coefficient: 0.10 Discharge: 0.56 cfs Outlet #3: BIO ORIFICE, Orifice Shape: Circular Diameter: 6.00 in Invert Elevation: 662.00 ft Coefficient: 0.60 Number of Openings: 1 Discharge: 1.95 cfs Velocity: 9.92 ft/s Stage-Storage Report Bioretention Elev(Ft) Storage(CF) Storage(CY) Storage(Acre-Ft) Area(SF) Area(Acre) 661.000 0.000 0.000 0.000 3036.579 0.070 662.000 3161.564 117.095 0.073 3289.649 0.076 663.000 6580.046 243.705 0.151 3549.700 0.081 664.000 10261.729 380.064 0.236 3814.832 0.088 665.000 14212.895 526.404 0.326 4087.158 0.094 666.000 18439.829 682.957 0.423 4365.688 0.100 666.000 18439.829 682.957 0.423 4650.413 0.107 PHONE(434)977-0205 FAX(434)296-5220 `°al INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEDBETTER.L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. EXTENDED DETENTION POST-DEVELOPMENT CONDITIONS Runoff Hydrograph: TR-55 Tabular Hydrograph Method 2YR STORM EVENT SEE ROUTED CONDITIONS FOR PEAK DISCHARGE FROM BIOFILTER 10YR STORM EVENT SEE ROUTED CONDITIONS FOR PEAK DISCHARGE FROM BIOFILTER 100YR STORM EVENT SEE ROUTED CONDITIONS FOR PEAK DISCHARGE FROM BIOFILTER EXTENDED DETENTION ROUTED CONDITIONS Reservoir Routing: Storage Indication Method 2YR STORM EVENT Results: Inflow Peak Flow: 2.37 cfs Inflow Peak Time: 12.40 hr Routed Peak Flow: 2.57 cfs Routed Peak Time: 12.40 hr Maximum Pond Storage: 0.0464 acre-feet Maximum Pond Elevation: 664.89 ft 10YR STORM EVENT Results: Inflow Peak Flow: 3.20 cfs Inflow Peak Time: 12.60 hr Routed Peak Flow: 3.32 cfs Routed Peak Time: 12.30 hr Maximum Pond Storage: 0.0481 acre-feet Maximum Pond Elevation: 664.95 ft 100YR STORM EVENT Results: Inflow Peak Flow: 4.97 cfs Inflow Peak Time: 12.70 hr Routed Peak Flow: 4.97 cfs Routed Peak Time: 12.70 hr Maximum Pond Storage: 0.0532 acre-feet Maximum Pond Elevation: 665.11 ft PHONE(434)977-0205 NFAX(434)296-5220 ;`; INFO@ROUDABUSH.COM ROUDABUSH, GALE &ASSOCIATES, INC. A PROFESSIONAL CORPORATION LAND SURVEYING Serving Virginia Since 1956 ENGINEERING 914 MONTICELLO ROAD LAND PLANNING CHARLOTTESVILLE,VIRGINIA 22902 WILLIAM J.LEI/BETTER.L.S. BRIAN D.JAMISON.L.S. JIM L.TAGGART,P.E. DAVID A.JORDAN,L.S. DAVID M.ROBINSON,P.E. KRISTOPHER C.WINTERS,L.S. AMMY M.GEORGE,L.A. EXTENDED DETENTION DESIGN PARAMETERS Multiple Outlet Design Outflow Total Discharge: 100.7192 cfs Max Water Surface Elevation: 666.50 ft Tailwater Elevation: 640.00 ft Detention Base Elevation: 0.00 ft Outlet #1: RISER, Drop Pipe Riser Top Elev: 665.00 ft Riser Base Elev: 661.50 ft Riser Diameter: 48.00 in Orifice Coefficient: 0.60 Weir Coefficient: 3.33 Culvert Length: 45.00 ft Culvert Diameter: 24.00 in Culvert Invert In: 660.75 ft Culvert Friction Coefficient: 0.01 Culvert Entrance Loss Coefficient: 0.10 Discharge: 33.31 cfs Outlet #2: SPILLWAY, Weir Shape: Rectangular with Contracted End Crest Length: 20.00 ft Invert Elevation: 666.00 ft Coefficient: 3.33 Number of Openings: 1 Discharge: 65.93 cfs Velocity: 3.30 ft/s Outlet #3: 01, Orifice Shape: Circular Diameter: 5.00 in Invert Elevation: 661.75 ft Coefficient: 0.60 Number of Openings: 1 Discharge: 1.47 cfs Velocity: 10.81 ft/s Stage-Storage Report Extended Detention Elev(Ft) Storage(CF) Storage(CY) Storage(Acre-Ft) Area(SF) A;rea(:Acre) 661.500 0.000 0.000 0.000 49.904 0.001 662.000 55.783 2.066 0.001 186.577 0.004 , 664.000 850.596 31.504 0.020 754.705 '0.01 666.000 3482.473 128.980 0.080 1949.009 0.045 668.000 8871.719 328.582 0.204 3472.167 0.080 670.000 17531.665 649.321 0.402 5217.504 `q . 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