Compute the 4-hr Snyder's synthetic unit hydrograph for a watershed with an area of 27.8 square miles and a main channel length of 16.3 miles. The main channel length from the outlet to the point opposite the centroid of the watershed is 5.4 miles. The regional parameters are C₁ = 1.7 and Cp = 0.5. Plot the resulting hydrograph and label the lagged time to peak (tr), time to peak (TDR), peak discharge (Q₂R), and time base (T₁). (similar to 8.4.4)

Compute the 4-hr Snyder's synthetic unit hydrograph for a watershed with an area of 27.8 square miles and a main channel length of 16.3 miles. The main channel length from the outlet to the point opposite the centroid of the watershed is 5.4 miles. The regional parameters are C₁ = 1.7 and Cp = 0.5. Plot the resulting hydrograph and label the lagged time to peak (tr), time to peak (TDR), peak discharge (Q₂R), and time base (T₁). (similar to 8.4.4)

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Unit Hydrograph

Hydrology is the science which deals with the study of water on the earth’s surface. The word Hydrograph is derived from the word hydro which means water. Hydrograph is basically a graph in which the discharge is plotted against the time interval at a specific point in a river or other channel. In a hydrograph, the discharge is plotted along the y-axis and time interval is plotted along the x-axis. Hydrograph is used to estimate the runoff. The variations in discharges with the change in time is shown by a hydrograph. It was revealed that the total discharge at an outlet increases with time by a kinematic wave model.

Question

Compute the 4-hr Snyder's synthetic unit hydrograph for a watershed with an area of 27.8 square
miles and a main channel length of 16.3 miles. The main channel length from the outlet to the point
opposite the centroid of the watershed is 5.4 miles. The regional parameters are C₁ = 1.7 and C₂ =
0.5. Plot the resulting hydrograph and label the lagged time to peak (tr), time to peak (TDR). peak
discharge (Q₂R), and time base (T₁). (similar to 8.4.4)

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Step 1: Know the objective of the problem.

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Step 2: Duration of standard synthetic unit hydrograph.

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Step 3: Assume triangular unit hydrograph

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Step 4: Adjustment of lag time.

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Step 5: Determine total discharge.

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Step 6: Determine base time.

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