CWR4306_Packet_05_master

CWR4306_Packet_05_master - CWR 4306 Urban Stormwater System...

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Lecture Packet 5: Site (basin) delineation Course website: http://www.ce.ufl.edu/~markn/CWR4306/ CWR 4306 – Urban Stormwater System Design
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Lecture Topics § Hydrologic cycle § General overland and stream flow § Defining a drainage basin § Read contour (or topographic) maps § Delineating a drainage basin § Area approximation § Hydraulic path—identify point of analysis (point of concentration) for a basin (or site)
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Site Delineation
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Hydrologic Cycle (schematic)
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Typical stream cross-section Three ways water typically reaches a stream Time Scale § Overland flow minutes to hours § Subsurface flow days to weeks (unsaturated zone—infiltration) § Groundwater—Base flow weeks to years
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A typical drainage basin (plan view)
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Basin delineation § For every stream a well-defined area of land captures the rainfall and conveys it to the stream (this area is called a Catchment area, watershed, or drainage basin ) § Basin divide (topographic divide which acts as a hydrologic divide) § Overland flow is directed by gravity away from the divide and toward
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CWR4306_Packet_05_master - CWR 4306 Urban Stormwater System...

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