The 1-hr unit hydrograph for a watershed is given below. Determine the direct ru

Question

The 1-hr unit hydrograph for a watershed is given below. Determine the direct runoff from this watershed for the given excess rainfall. Route the following inflow hydrograph and report the report the peak attenuation and time lag of the flood. Assume inflow is equal to outflow in the beginning. Use Muskingum routing method (x = 0.1, K = 2 hr). Area of drainage basin = 0.2 mile^2. time of concentration = 100 min, Rainfall intensity = 2.75 in/hr., Rainfall duration = 200 min, Runoff coefficient = 0.8. Find the discharge rate from the basin at 150 minute from the beginning of rainfall. Consider 1 mile^2 = 640 acre. C- 0 = (Delta t/K) - 2X/(2(1 - X) + (Delta t/K) C_1 = (Delta t/K) + 2X/(2(1- X) + (Delta t/K) C_2 = 2(1 - X) - (Delta t/K)/(2(1 - X) + (Delta t/K)

Explanation / Answer

1)Difference between Hyetograph and Hydrograph:-

Hyetograph is the graphical representation of rainfall intensity with time. It is often represented by a bar graph.

while a graph showing for a given point on a stream the discharge,velocity, depth or other property of water with respect to time that is called hydrograph.

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