CWR4306_Packet_08_master

CWR4306_Packet_08_master - CWR 4306 Urban Stormwater System...

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Lecture Packet 8: Stormwater detention/retention Course website: http://www.ce.ufl.edu/~markn/CWR4306 CWR 4306 – Urban Stormwater System Design
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Stormwater detention Topics covered in this lecture § Overview of stormwater detention § Attenuation and Lag of detention systems § Retention vs. Detention § Dry vs. Wet ponds § On-line vs. Off-line § Independent vs. Interconnected ponds § Regional vs. On-site Detention Reading: Computer Applications in Hydraulic Engineering (Chapter 5). Stormwater Conveyance Modeling and Design (Chapter 12).
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Concept of hydrograph attenuation
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Overview of stormwater detention
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Attenuation of inflow hydrograph and lag due to routing Inflow hydrograph – area under curve is total volume of runoff for a specified storm event Outflow hydrograph – represents the actual discharge from detention system
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Pre-development and post-development hydrographs Area under post-development (inflow and outflow) curves are the same, but we have reduced the peak flow (Qp) and extended the length of time that water is detained (stored) onsite.
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Net increase in runoff volume Post-developed peak flow must not exceed pre-developed conditions
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CWR4306_Packet_08_master - CWR 4306 Urban Stormwater System...

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