GG4153-6153 Engineering Geology Lab 8 Groundwater Surfacewater (1).docx

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Engineering Geology-Laboratory 8 (100 points) Due before next laboratory Groundwater & Surface water Name Yoman Yonjan Part 1 1) Surface Water ( 40 points) The table below lists discharge amounts and gage heights for the station on the Blackstone River at Woonsocket, Rhode Island. The discharge period is from 12 a.m. August 18, 1955 through 4 a.m. August 20, 1955. The gage records flooding from a passing hurricane. Under normal circumstances the discharge-time plot of the flood would approximate a bell-shaped curve. However, you will note a sharp deviation from this theoretical curve, the result of a dam failure upstream from Woonsocket. a)Plot the data from the table below on the graphs provided. Plot a discharge-time curveon the lower graph, and a stage (height)-time curve on the upper graph (20 points) Table Gage Data for the Blackstone River, Woonsocket, Rhode Island Date Time Gage Height (ft) Discharge (Ft3/sec) August 18 24:00 2.46 279 04:00 2.50 291 08:00 2.76 377 12:00 3.22 580 16:00 3.55 770 20:00 4.36 1340 August 19 24:00 4.33 1320 04:00 4.86 1900 08:00 8.09 6010 12:00 10.28 8940 16:00 12.77 12600 20:00 15.00 16600 August 20 24:00 NA 29800 04:00 NA 27800
02468101214TimeGuage Height100100010000TimeDischarge
b)When did the flood from the dam failure reach the gage station? c) Should the dam be rebuilt? Remember it was originally built to provide flood protection. Defend your answer.

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