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Appendix F - Hydrology and Water Quality Supporting Information COMBINED
City of Pleasanton
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BOARDS AND COMMISSIONS
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PLANNING
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AGENDA PACKETS
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2020 - PRESENT
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2025
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12-10
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ITEM 5 EXHIBIT A
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Appendix F - Hydrology and Water Quality Supporting Information COMBINED
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12/2/2025 3:59:31 PM
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131074BAHM 2025-09-23 9/29/2025 1:29:28 PM Page 35 <br />BMP5 <br />Bottom Length: 15.20 ft. <br />Bottom Width: 10.00 ft. <br />Material thickness of first layer: 1.5 <br />Material type for first layer: BAHM 5 <br />Material thickness of second layer: 1.17 <br />Material type for second layer: GRAVEL <br />Material thickness of third layer: 0 <br />Material type for third layer: GRAVEL <br />Infiltration On <br />Infiltration rate:0.05 <br />Infiltration reduction factor:1 <br />Total Volume Infiltrated (ac-ft.):2.047 <br />Total Volume Through Riser (ac-ft.):0.72 <br />Total Volume Through Facility (ac-ft.):13.112 <br />Percent Infiltrated:15.61 <br />Total Precip Applied to Facility:0.772 <br />Total Evap From Facility:0.333 <br />Underdrain used <br />Underdrain Diameter (feet):0.333333333333333 <br />Orifice Diameter (in.):1.5 <br />Offset (in.):6 <br />Flow Through Underdrain (ac-ft.):10.345 <br />Total Outflow (ac-ft.):13.112 <br />Percent Through Underdrain:78.9 <br />Discharge Structure <br />Riser Height:0.5 ft. <br />Riser Diameter:27.08 in. <br />Notch Type:Rectangular <br />Notch Width:0.000 ft. <br />Notch Height:0.000 ft. <br />Element Outlets: <br />Outlet 1 Outlet 2 <br />Outlet Flows To: <br /> Bioretention Hydraulic Table <br />Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) <br />0.0000 0.0101 0.0000 0.0000 0.0000 <br />0.0370 0.0101 0.0000 0.0000 0.0000 <br />0.0741 0.0100 0.0001 0.0000 0.0000 <br />0.1111 0.0099 0.0001 0.0000 0.0000 <br />0.1481 0.0098 0.0001 0.0000 0.0000 <br />0.1852 0.0097 0.0001 0.0000 0.0000 <br />0.2222 0.0096 0.0002 0.0000 0.0000 <br />0.2592 0.0095 0.0002 0.0000 0.0000 <br />0.2963 0.0094 0.0002 0.0000 0.0000 <br />0.3333 0.0093 0.0002 0.0000 0.0000 <br />0.3703 0.0092 0.0003 0.0000 0.0000 <br />0.4074 0.0091 0.0003 0.0002 0.0002 <br />0.4444 0.0090 0.0003 0.0002 0.0002 <br />0.4814 0.0089 0.0004 0.0002 0.0002 <br />0.5185 0.0088 0.0004 0.0002 0.0002 <br />0.5555 0.0087 0.0004 0.0002 0.0002 <br />0.5925 0.0086 0.0005 0.0002 0.0002 <br />0.6296 0.0085 0.0005 0.0002 0.0002
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