National Resources Conservation Service Watershed Lag Time Calculator
Watershed Hydrology Equations Formulas
Problem:
Solve for watershed lag time.
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 | time of concentration |
 | overland flow distance |
 | retardance coefficient |
 | slope |
 | time of concentration |
 | flow length |
 | retardance roughness coefficient |
 | time of concentration |
 | travel length |
 | slope |
 | time of concentration |
 | overland flow length |
 | Manning's overland flow roughness coefficient |
 | rainfall intensity |
 | average overland flow path slope |
 | time of concentration |
 | watershed lag time |
 | watershed lag time |
 | watershed hydraulic length |
 | potential watershed storage |
 | average watershed slope |
 | time of concentration |
 | channel length |
 | watershed area |
 | linear profile slope |
References - Books:
Martin Wanielista, Robert Kersten and Ron Eaglin. 1997. Hydrology Water Quantity and Quality Control. John Wiley & Sons. 2nd ed.
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