Transcription of BEE 473 Watershed Engineering Fall 2004 - Cornell …
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BEE 473 Watershed Engineering Fall 2004 - Cornell …
BEE 473 Watershed Engineering fall 2004 . runoff CALCULATIONS. The following provide the minimum necessary equations for determining runoff from a design storm, , a storm with duration to the Watershed 's time of concentration. When peak flow is the critical design parameter engineers usually design for this storm duration because it represents the most intense storm (shortest duration) for which the entire Watershed contributes flow to the outlet. This section emphasizes peak runoff ; we will discuss design criteria for runoff volume later in conjunction with ponds, flood routing, and detention basin design A. Time of Concentration: B. Rational Method C. Curve Number Method 1. Calculating runoff Volume 2. Synthetic Triangular Hydrograph 3. Calculating Peak runoff (NRCS Graphical Method).
BEE 473 Watershed Engineering Fall 2004 B. Rational Method The Rational Method, a.k.a. Lloyd-Davies method if you are English, is probably the oldest runoff equation (documented use in the 1800s) and remains very popular in urban storm water
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