# Lab3 - Hydrology of the Environment CVEN 3360 Runoff...

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Hydrology of the Environment CVEN 3360 Runoff Computations and Hydrograph Analysis Lab #3 Philip Hotzen II Umair Ismail Manual Mendosa March 18, 2010 Dr. Qin Qian

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Questions: a) Using the Φ-index values,determine the excess rainfall over each subarea for the storm for each half-hour period. Time Accumulated Rain Incremental Rain 0 0 0 0.5 0.5 0.5 1 2 1.5 1.5 3 1 2 3.4 0.4 2.5 3.6 0.2 Subarea A Φ=0.8 in/hr Φ=0.4 in/(half-hr) Incremental Rain – Φ = Excess Incremental Rain Φ Excess (in) 0 0.4 0 0.5 0.4 0.1 1.5 0.4 1.1 1 0.4 0.6 0.4 0.4 0 0.2 0.4 0 Σ Excess = 1.8 in Subarea B Φ=0.2 in/hr Φ=0.1 in/(half-hr) Incremental Rain – Φ = Excess Incremental Rain Φ Excess (in) 0 0.1 0 0.5 0.1 0.4 1.5 0.1 1.4 1 0.1 0.9 0.4 0.1 0.3 0.2 0.1 0.1 Σ Excess = 3.1 in
b)Computer the half-hour unit hydrograph for subarea A from the 2-hour unit hydrograph by using the S-hydrograph method. On the same graph, show the S-hydrograph, and the half-hour and 2-hour unit hydrographs. A table in your dicussion should summarize the peak flow rate, time to peak, and time base of both the half-hour and 2-hour unit hydrographs for subarea A. Subarea A time (h) cfs/in 2nd 2hr 3rd 2hr 4th 2hr 5th 2hr S- hydrograph Lagged 0.5 hr Difference .5 UH = 0 0 0 0 0 0.5 40 40 0 40 160 1 170 170 40 130 520 1.5 320 320 170 150 600 2 450 0 450 320 130 520 2.5 540 40 580

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## This note was uploaded on 07/18/2010 for the course CE 2598 taught by Professor Ali during the Spring '10 term at Lahore University of Management Sciences.

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Lab3 - Hydrology of the Environment CVEN 3360 Runoff...

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