1 / 9

Hydrograph Analysis Methods for Watershed Response

Understand the characteristics of direct runoff, baseflow recession, and excess rainfall hyetographs. Learn to determine the unit hydrograph and use time superposition for variable rainfall scenarios. Solve for unit hydrograph ordinates with Mays' least squares method. Develop unit hydrographs for different durations.

blanks
Download Presentation

Hydrograph Analysis Methods for Watershed Response

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related