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Problem 8.2.3

Problem 8.2.3. End of direct runoff and beginning of baseflow recession. Problem 8.2.4. Determining the  index and Excess Rainfall Hyetograph. Recap of Unit Hydrograph basics.

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Problem 8.2.3

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  1. Problem 8.2.3 End of direct runoff and beginning of baseflow recession

  2. Problem 8.2.4.

  3. Determining the  index and Excess Rainfall Hyetograph

  4. Recap of Unit Hydrograph basics A D hour unit hydrograph is the characteristic response of a given watershed to a unit volume (e.g. 1 in or cm) of effective water input (usually rain) applied at a constant rate for D hours Runoff (mm/hr) Runoff and Flow Flow (m3/s) Time Superposition is used to determine the response to variable rainfall

  5. Calculating a Hydrograph from a Unit Hydrograph and visa versa ... ... for n=1 ... N From Mays, 2011, Ground and Surface Water Hydrology

  6. Example 8.3.1

  7. Determining the Unit Hydrograph from Direct Runoff Hydrograph Observations M =4 precip values N=9 Direct Runoff Hydrograph Ordinates L=N=M+1=6 Unit Hydrograph ordinates 9 equations to solve for 6 U values (Overdetermined system – use least squares with Solver) Any 6 initial U values Minimize this by changing these

  8. S Curves From Mays, 2011, Ground and Surface Water Hydrology

  9. S Curve to Develop 2 hr unit hydrograph

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