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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 1:29:27 PM Page 25 <br />BMP3 <br />Bottom Length: 136.00 ft. <br />Bottom Width: 5.00 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 />Underdrain used <br />Underdrain Diameter (feet):0.333333333333333 <br />Orifice Diameter (in.):1.5 <br />Offset (in.):6 <br />Flow Through Underdrain (ac-ft.):59.841 <br />Total Outflow (ac-ft.):68.578 <br />Percent Through Underdrain:87.26 <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 0.0665 0.0000 0.0000 0.0000 <br />0.0370 0.0664 0.0001 0.0000 0.0000 <br />0.0741 0.0657 0.0002 0.0000 0.0000 <br />0.1111 0.0650 0.0004 0.0000 0.0000 <br />0.1481 0.0643 0.0005 0.0000 0.0000 <br />0.1852 0.0636 0.0006 0.0000 0.0000 <br />0.2222 0.0628 0.0007 0.0000 0.0000 <br />0.2592 0.0621 0.0009 0.0000 0.0000 <br />0.2963 0.0614 0.0010 0.0000 0.0000 <br />0.3333 0.0607 0.0012 0.0000 0.0000 <br />0.3703 0.0600 0.0013 0.0000 0.0000 <br />0.4074 0.0593 0.0015 0.0000 0.0000 <br />0.4444 0.0586 0.0017 0.0000 0.0000 <br />0.4814 0.0579 0.0018 0.0000 0.0000 <br />0.5185 0.0571 0.0020 0.0000 0.0000 <br />0.5555 0.0564 0.0022 0.0000 0.0000 <br />0.5925 0.0557 0.0024 0.0000 0.0000 <br />0.6296 0.0550 0.0026 0.0000 0.0000 <br />0.6666 0.0543 0.0028 0.0000 0.0000 <br />0.7036 0.0536 0.0030 0.0000 0.0000 <br />0.7407 0.0529 0.0032 0.0000 0.0000 <br />0.7777 0.0522 0.0034 0.0000 0.0000 <br />0.8147 0.0515 0.0036 0.0000 0.0000 <br />0.8518 0.0508 0.0038 0.0000 0.0000 <br />0.8888 0.0500 0.0041 0.0000 0.0000 <br />0.9258 0.0493 0.0043 0.0000 0.0000 <br />0.9629 0.0486 0.0045 0.0000 0.0000
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