Summary of Detention Pond Calculation Canyon Estates American Canyon, California
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1 July 15, 2015 Bellecci & Associates, Inc Summary of Detention Pond Calculation Canyon Estates American Canyon, California 1. Methodology: Method: Unit Hydrograph Software: Bentley Pond Pack Version 8i Modeled: 100-year storm event, 24-hour duration Storm Drain layout Hydrology Map dated April 2015 Rainfall Distribution Type IA (Haestad's Stormwater Conveyance Modeling & Design - 5th Edition). Rainfall 6.0 inches (From NOAA Atlas 2, Vol XI) Time of Concentration Figure 1 Travel Time for Overland Flow (American Canyon Dept. of Public Works - Engineering Standard Plans and Specifications for Public Improvements) Roof to Gutter Time 9 mins. 2. Pre-Development Condition: Longest Time of Concentration 0.40 hours (24 mins.) Existing peak flow rate cfs 3. Post-Development Condition: Longest Time of Concentration 0.50 hours (30 mins.) Proposed peak flow rate cfs 4. Storage: Detention Pond o Top of Pond 11 o Bottom of Pond o 21" Dia Outlet Pipe Invert In o Pipe Outfall Invert o Pond Bottom Dimensions 70 ft x 100 ft o Side Slopes 3:1 o Peak Water Surface Elevation o Peak Storage Volume ac-ft o Peak Inflow cfs 5. Summary: Peak Outflow for Post Development is less than Peak Outflow for Pre- Development Condition. CONCORD 2290 Diamond Blvd. Suite 100 Concord, CA Tel PLEASANTON 7041 Koll Parkway, Suite 132 Pleasanton, CA Tel Civil Engineering Land Surveying
2 Appendix A Pre-Development Calculations CONCORD 2290 Diamond Blvd. Suite 100 Concord, CA Tel PLEASANTON 7041 Koll Parkway, Suite 132 Pleasanton, CA Tel Civil Engineering Land Surveying
3 Scenario: Pre-Development 100yr-24hr CM-1 O Canyon Estates.ppc Watertown, CT USA Page 1 of 1
4 Scenario Calculation Summary Scenario Summary ID Label Notes Active Topology Hydrology Rainfall Runoff Physical Initial Condition Boundary Condition Infiltration and Inflow Output User Data Extensions PondPack Engine Calculation Options 1 Pre-Development 100yr-24hr Pre-Development Active Topology Pre-Development Hydrology 100yr-24hr Pre-Development Physical Pre-Development Initial Condition Pre-Development Boundary Condition Pre-Development Infiltration and Inflow Pre-Development Output Pre-Development User Data Extensions Base Calculation Options Output Summary Output Increment 50 hours Duration hours Rainfall Summary Return Event Tag Total in Rainfall Type Storm Event Time- Curve 100yr-24hr Executive Summary (Nodes) Label Scenario Return Event (years) Truncation Hydrograph Volume Time to Peak (hours) Peak Flow (ft³/s) Maximum Water Surface Elevation (ft) Maximum Pond Storage CM-1 O-1 Pre- Developme nt 100yr- 24hr Pre- Developme nt 100yr- 24hr None None Executive Summary (Links) Label Type Location Hydrograph Volume Peak Time (hours) Peak Flow (ft³/s) End Point Node Flow Direction Canyon Estates-Pre- Development.ppc Page 1 of 1
5 Subsection: Time- Curve Label: Type IA Time- Curve: 100yr-24hr Label Start Time Increment End Time Return Event 100yr-24hr 00 hours 00 hours hours 100 years Time (hours) CUMULATIVE RAINFALL Output Time Increment = 00 hours Time on left represents time for first value in each row Canyon Estates-Pre- Development.ppc Page 1 of 2
6 Subsection: Time- Curve Label: Type IA Time (hours) CUMULATIVE RAINFALL Output Time Increment = 00 hours Time on left represents time for first value in each row Canyon Estates-Pre- Development.ppc Page 2 of 2
7 Subsection: Master Network Summary Catchments Summary CM-1 Label Scenario Pre-Development 100yr-24hr Return Event (years) 100 Hydrograph Volume Time to Peak (hours) Peak Flow (ft³/s) Node Summary O-1 Label Scenario Pre-Development 100yr-24hr Return Event (years) 100 Hydrograph Volume Time to Peak (hours) Peak Flow (ft³/s) Canyon Estates-Pre- Development.ppc Page 1 of 1
8 Subsection: Unit Hydrograph Summary Label: CM-1 Storm Event Return Event Duration Time of Concentration (Composite) Area (User Defined) 100yr-24hr 100 years hours 6.0 in hours acres Computational Time Increment Time to Peak (Computed) Flow (Peak, Computed) Output Increment Time to Flow (Peak Interpolated Output) Flow (Peak Interpolated Output) 53 hours hours ft³/s 50 hours hours ft³/s Drainage Area SCS CN (Composite) Area (User Defined) Maximum Retention (Pervious) Maximum Retention (Pervious, 20 percent) acres 2.7 in 0.5 in Cumulative Runoff Cumulative Runoff (Pervious) Runoff Volume (Pervious) 3.7 in ac-ft Hydrograph Volume (Area under Hydrograph curve) Volume ac-ft SCS Unit Hydrograph Parameters Canyon Estates-Pre- Development.ppc Time of Concentration (Composite) Computational Time Increment Unit Hydrograph Shape Factor K Factor Receding/Rising, Tr/Tp Unit peak, qp Unit peak time, Tp hours 53 hours ft³/s hours Page 1 of 2
9 Subsection: Unit Hydrograph Summary Label: CM-1 SCS Unit Hydrograph Parameters Unit receding limb, Tr Total unit time, Tb hours hours Canyon Estates-Pre- Development.ppc Page 2 of 2
10 Appendix B Post-Development Calculations CONCORD 2290 Diamond Blvd. Suite 100 Concord, CA Tel PLEASANTON 7041 Koll Parkway, Suite 132 Pleasanton, CA Tel Civil Engineering Land Surveying
11 Scenario: Post-Development 100yr-24hr Outlet Canyon Estates - Post Dev-1..ppc Page 1 of 1
12 Scenario Calculation Summary Scenario Summary ID Label Notes Active Topology Hydrology Rainfall Runoff Physical Initial Condition Boundary Condition Infiltration and Inflow Output User Data Extensions PondPack Engine Calculation Options 40 Post-Development 100yr-24hr Pre-Development Active Topology Pre-Development Hydrology 100yr-24hr Pre-Development Physical Pre-Development Initial Condition Pre-Development Boundary Condition Pre-Development Infiltration and Inflow Pre-Development Output Pre-Development User Data Extensions Base Calculation Options Output Summary Output Increment 50 hours Duration hours Rainfall Summary Return Event Tag Total in Rainfall Type Storm Event Time- Curve 100yr-24hr Executive Summary (Nodes) Label Scenario Return Event (years) Truncation Hydrograph Volume Time to Peak (hours) Peak Flow (ft³/s) Maximum Water Surface Elevation (ft) Maximum Pond Storage CM-1 CM-2 CM-3 O-3 PO-1 (IN) Post- Developme nt 100yr- 24hr Post- Developme nt 100yr- 24hr Post- Developme nt 100yr- 24hr Post- Developme nt 100yr- 24hr Post- Developme nt 100yr- 24hr None None None None None Page 1 of 2
13 Scenario Calculation Summary Executive Summary (Nodes) Label PO-1 (OUT) Scenario Post- Developme nt 100yr- 24hr Return Event (years) 100 Truncation None Hydrograph Volume Time to Peak (hours) Peak Flow (ft³/s) Maximum Water Surface Elevation (ft) Maximum Pond Storage Executive Summary (Links) Label Outlet-1 Outlet-1 Outlet-1 Outlet-1 Type Pond Outlet Pond Outlet Pond Outlet Pond Outlet Location Upstream Outflow Link Downstream Hydrograph Volume Peak Time (hours) Peak Flow (ft³/s) End Point PO-1 PO-1 O-3 Node Flow Direction Pond Inflow Pond Outflow Message Id Scenario Element Type Element Id Label Time Message Source Messages 15 Post-Development 100yr-24hr Composite Outlet Structure 39 Composite Outlet Structure - 1 Kr (reverse flow entrance loss coefficient) was not specified. Kr was set to same value as Ke= Warning Page 2 of 2
14 Subsection: Time- Curve Label: Time- - 1 Time- Curve: 100yr-24hr Label Start Time Increment End Time Return Event 100yr-24hr 00 hours 00 hours hours 100 years Time (hours) CUMULATIVE RAINFALL Output Time Increment = 00 hours Time on left represents time for first value in each row Page 1 of 2
15 Subsection: Time- Curve Label: Time- - 1 Time (hours) CUMULATIVE RAINFALL Output Time Increment = 00 hours Time on left represents time for first value in each row Page 2 of 2
16 Subsection: Unit Hydrograph Summary Label: CM-1 Storm Event Return Event Duration Time of Concentration (Composite) Area (User Defined) 100yr-24hr 100 years hours 6.0 in hours 90 acres Computational Time Increment Time to Peak (Computed) Flow (Peak, Computed) Output Increment Time to Flow (Peak Interpolated Output) Flow (Peak Interpolated Output) 44 hours hours 0 ft³/s 50 hours hours 0 ft³/s Drainage Area SCS CN (Composite) Area (User Defined) Maximum Retention (Pervious) Maximum Retention (Pervious, 20 percent) acres 2.0 in 0.4 in Cumulative Runoff Cumulative Runoff (Pervious) Runoff Volume (Pervious) 4.1 in ac-ft Hydrograph Volume (Area under Hydrograph curve) Volume ac-ft SCS Unit Hydrograph Parameters Time of Concentration (Composite) Computational Time Increment Unit Hydrograph Shape Factor K Factor Receding/Rising, Tr/Tp Unit peak, qp Unit peak time, Tp hours 44 hours ft³/s hours Page 1 of 2
17 Subsection: Unit Hydrograph Summary Label: CM-1 SCS Unit Hydrograph Parameters Unit receding limb, Tr Total unit time, Tb hours hours Page 2 of 2
18 Subsection: Unit Hydrograph Summary Label: CM-2 Storm Event Return Event Duration Time of Concentration (Composite) Area (User Defined) 100yr-24hr 100 years hours 6.0 in hours acres Computational Time Increment Time to Peak (Computed) Flow (Peak, Computed) Output Increment Time to Flow (Peak Interpolated Output) Flow (Peak Interpolated Output) 67 hours hours ft³/s 50 hours hours ft³/s Drainage Area SCS CN (Composite) Area (User Defined) Maximum Retention (Pervious) Maximum Retention (Pervious, 20 percent) acres 2.0 in 0.4 in Cumulative Runoff Cumulative Runoff (Pervious) Runoff Volume (Pervious) 4.1 in ac-ft Hydrograph Volume (Area under Hydrograph curve) Volume ac-ft SCS Unit Hydrograph Parameters Time of Concentration (Composite) Computational Time Increment Unit Hydrograph Shape Factor K Factor Receding/Rising, Tr/Tp Unit peak, qp Unit peak time, Tp hours 67 hours ft³/s hours Page 1 of 2
19 Subsection: Unit Hydrograph Summary Label: CM-2 SCS Unit Hydrograph Parameters Unit receding limb, Tr Total unit time, Tb hours hours Page 2 of 2
20 Subsection: Unit Hydrograph Summary Label: CM-3 Storm Event Return Event Duration Time of Concentration (Composite) Area (User Defined) 100yr-24hr 100 years hours 6.0 in 83 hours acres Computational Time Increment Time to Peak (Computed) Flow (Peak, Computed) Output Increment Time to Flow (Peak Interpolated Output) Flow (Peak Interpolated Output) 11 hours hours 0.72 ft³/s 50 hours hours 0.71 ft³/s Drainage Area SCS CN (Composite) Area (User Defined) Maximum Retention (Pervious) Maximum Retention (Pervious, 20 percent) acres 2.7 in 0.5 in Cumulative Runoff Cumulative Runoff (Pervious) Runoff Volume (Pervious) 3.7 in ac-ft Hydrograph Volume (Area under Hydrograph curve) Volume ac-ft SCS Unit Hydrograph Parameters Time of Concentration (Composite) Computational Time Increment Unit Hydrograph Shape Factor K Factor Receding/Rising, Tr/Tp Unit peak, qp Unit peak time, Tp 83 hours 11 hours ft³/s 56 hours Page 1 of 2
21 Subsection: Unit Hydrograph Summary Label: CM-3 SCS Unit Hydrograph Parameters Unit receding limb, Tr Total unit time, Tb hours hours Page 2 of 2
22 Subsection: Outlet Input Data Label: Composite Outlet Structure - 1 Requested Pond Water Surface Elevations Minimum (Headwater) Increment (Headwater) Maximum (Headwater) 110 ft 0.50 ft 120 ft Outlet Connectivity Structure Type Culvert-Circular Tailwater Settings Outlet ID Culvert - 1 Tailwater Direction Forward TW Outfall E1 (ft) E2 (ft) 120 Page 1 of 3
23 Subsection: Outlet Input Data Label: Composite Outlet Structure - 1 Structure ID: Culvert - 1 Structure Type: Culvert-Circular Number of Barrels Diameter Length Length (Computed Barrel) Slope (Computed) in 190 ft 197 ft 42 ft/ft Outlet Control Data Manning's n Ke Kb Kr Convergence Tolerance ft Inlet Control Data Equation Form K M C Y T1 ratio (HW/D) T2 ratio (HW/D) Slope Correction Factor Form Use unsubmerged inlet control 0 equation below T1 elevation. Use submerged inlet control 0 equation above T2 elevation In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... T1 Elevation T2 Elevation ft ft T1 Flow T2 Flow ft³/s ft³/s Page 2 of 3
24 Subsection: Outlet Input Data Label: Composite Outlet Structure - 1 Structure ID: TW Structure Type: TW Setup, DS Channel Tailwater Type Free Outfall Convergence Tolerances Maximum Iterations Tailwater Tolerance (Minimum) Tailwater Tolerance (Maximum) Headwater Tolerance (Minimum) Headwater Tolerance (Maximum) Flow Tolerance (Minimum) Flow Tolerance (Maximum) 30 1 ft 0.50 ft 1 ft 0.50 ft 01 ft³/s 100 ft³/s Page 3 of 3
25 Subsection: Trapezoidal Volume Label: PO-1 Length.--Top---- B W i b d A b1 C t `----Bottom----' h ` D ' Diagram Not to Scale Pond Volume Calculation for Trapezoidal Basin Trapezoid Top Elevation Trapezoid Top Length (A to C) Trapezoid Top Width (B to D) Trapezoid Bottom Elevation Trapezoid Bottom Length Trapezoid Bottom Width Trapezoid Width Offset (B to b2) Trapezoid Length Offset (A to b1) Trapezoid Vertical Increment 120 ft ft ft ft 100 ft 70 ft 0 ft 0 ft 0.20 ft Elevation (ft) Planimeter (ft²) Area (acres) A1+A2+sqr (A1*A2) (acres) Volume Volume (Total) Page 1 of 2
26 Subsection: Trapezoidal Volume Label: PO-1 Elevation (ft) Planimeter (ft²) Area (acres) A1+A2+sqr (A1*A2) (acres) Volume Volume (Total) Page 2 of 2
27 Subsection: Level Pool Pond Routing Summary Label: PO-1 (IN) Infiltration Infiltration Method (Computed) No Infiltration Initial Conditions Elevation (Water Surface, Initial) Volume (Initial) Flow (Initial Outlet) Flow (Initial Infiltration) Flow (Initial, Total) Time Increment ft 00 ac-ft 0 ft³/s 0 ft³/s 0 ft³/s 50 hours Inflow/Outflow Hydrograph Summary Flow (Peak In) Flow (Peak Outlet) ft³/s ft³/s Time to Peak (Flow, In) Time to Peak (Flow, Outlet) hours hours Elevation (Water Surface, Peak) ft Volume (Peak) ac-ft Mass Balance Volume (Initial) Volume (Total Inflow) Volume (Total Infiltration) Volume (Total Outlet Outflow) Volume (Retained) Volume (Unrouted) Error (Mass Balance) 00 ac-ft ac-ft 00 ac-ft ac-ft 34 ac-ft -12 ac-ft % Page 1 of 1
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