Practice Quiz

Civil Engineering PE

Category - Hydrology

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Which of the following models is used to simulate rainfall runoff from a watershed?
  1. Natural Resources Conservation Service (NRCS) TR-55
  2. U.S. EPA Storm Water Management Model (SWMM)
  3. Rational method
  4. A. and C.
Explanation
Answer: D - The NCRS TR-55 and Rational method are models that are used to simulate rainfall runoff from a watershed. TR-55 was originally developed in 1954 and uses the United States Department of Agriculture (USDA) Soil Conservation Service (SCS) runoff equation to predict peak runoff rates and volumes in small watersheds in the United States. The Rational method is based on the following formula that relates the potential runoff that may be produced by a watershed (C), rainfall intensity (i) and watershed drainage area (A): Q = CiA (where Q is the design discharge).
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