Arrange the following steps in sequential order for obtaining a unit hydrograph:
A. Separation of base flow
B. Estimating the surface runoff in volume
C. Estimating the surface runoff in depth
D. Dividing surface runoff ordinates by depth of runoff
Choose the correct answer from the options given below :
A. Separation of base flow
B. Estimating the surface runoff in volume
C. Estimating the surface runoff in depth
D. Dividing surface runoff ordinates by depth of runoff
Choose the correct answer from the options given below :
Show Hint
- D, C, B, A
- A, B, C, D
- D, B, C, A
- A, C, B, D
The Correct Option is B
Solution and Explanation
Step 1: Obtain the Direct Runoff Hydrograph (DRH).
The first step is to subtract the base flow from the total flood hydrograph ordinates to get the DRH. This is Separation of base flow (A).
Step 2: Quantify the runoff.
Next, we calculate the total volume of surface runoff (B) by integrating the area under the DRH. This volume is then converted to surface runoff depth (C) by dividing the volume by the catchment area.
Step 3: Normalize for Unit Rainfall.
Finally, to get the Unit Hydrograph (representing 1 cm depth), we perform Step D: dividing all the ordinates of the Direct Runoff Hydrograph by the calculated depth of runoff ($n$ cm).
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