CWR4306_Packet_07_master

CWR4306_Packet_07_master - CWR 4306 Urban Stormwater System...

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Lecture Packet 7: Unit Hydrographs and Discrete Convolution Course website: http://www.ce.ufl.edu/~markn/CWR4306 CWR 4306 – Urban Stormwater System Design
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Hydrograph Estimation Methods § Modified Rational Method § SCS (NRCS) Unit Hydrograph Method § Discrete Convolution § Kinematic Wave § Santa Barbara Urban Hydrograph Estimating Runoff The unit hydrograph material from this lecture (up through discrete convolution) is discussed in detail in Section 2.4 of Computer Applications in Hydraulic Engineering (Hydraulics Book) and in Section 5.5 of Stormwater Conveyance Modeling and Design (Text Book).
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Hydrograph definition sketch § Peak flow estimates (Rational, NRCS methods) do not account for storage § A Runoff hydrograph is needed to account for storage within the basin § Hydrographs also allow for consideration of § Variability in rainfall duration (variable intensity)
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Hydrograph development (unit hydrograph) Runoff Hydrograph Most methods for generating hydrographs are based upon the Unit Hydrograph method
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Unit hydrograph concept Unit Hydrograph —the hydrograph produced by a unit depth of rainfall (usually 1 in or 1 cm) distributed uniformly over a basin for a specified period of time (duration).
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Unit hydrograph concept Point of analysis Point of concentration
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Unit hydrograph from 1 inch of effective rainfall
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This document was uploaded on 10/29/2011 for the course CWR 4306 at University of Florida.

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CWR4306_Packet_07_master - CWR 4306 Urban Stormwater System...

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