Example 5. (a) The peak of flood hydrograph due to a 3-h duration isolated storm in a catchment is 270 m³/s. The total depth of rainfall is 5.9 cm. Assuming an average infiltratior loss of 0.3 cm/h and a constant base flow of 20 m³/s, estimate the peak of the 3-h uni hydrograph (UH) of this catchment. (b) If the area of the catchment is 567 km² determine the base width of the 3-h unit hydrograph by assuming it to be triangular.

Example 5. (a) The peak of flood hydrograph due to a 3-h duration isolated storm in a catchment is 270 m³/s. The total depth of rainfall is 5.9 cm. Assuming an average infiltratior loss of 0.3 cm/h and a constant base flow of 20 m³/s, estimate the peak of the 3-h uni hydrograph (UH) of this catchment. (b) If the area of the catchment is 567 km² determine the base width of the 3-h unit hydrograph by assuming it to be triangular.

Structural Analysis

6th Edition

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

Example 5. (a) The peak of flood hydrograph due to a 3-h duration isolated storm in a
catchment is 270 m³/s. The total depth of rainfall is 5.9 cm. Assuming an average infiltration
loss of 0.3 cm/h and a constant base flow of 20 m³/s, estimate the peak of the 3-h unit
hydrograph (UH) of this catchment. (b) If the area of the catchment is 567 km² determine the
base width of the 3-h unit hydrograph by assuming it to be triangular.

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