HW-2 Pretreanment Fis ENVE 4410/551O INTRODUCTION TO ENVIRONMENTAL ENGINEERING P
ID: 1885176 • Letter: H
Question
HW-2 Pretreanment Fis ENVE 4410/551O INTRODUCTION TO ENVIRONMENTAL ENGINEERING Problem Set No. 2 Preliminary Treatment 1. (Sato) What is the calculated wastewater flow (cfs) through the Parshall flume with a throat width of 3.0 ft at the maximum free-flow head of 3.5 fi? 2. (8-1 5th DC 559) A treatment plant being designed for Cynusoidal City requires an equalization basin to even out flow and BOD variations. The average daily flow is 0.400 m/s. The following flows and BODs have been found to be typical of the average variation over a day What size equalization basin, in cubic meters, is required to provide for a uniform outflow equal to the average daily flow? Assume the flows are hourly average. Use the method described by Davis and Cornwell (4th Edition). (Answer is V- 6,110 m2 with out safety factor). Time, h Flow, m3/s BODS Time, h Flow, m3s BO05 1200 05080 0.3400 0.2540 0.1600 0.1320 0.1320 0.1400 0.1600 100 118 0.5260 400 500 600 700 800 900 1400 0.5300 1500 05520 1600 0.5700 700 0.5960 1800 0.6040 1900 0 5700 2000 05520 2100 04740 2200 04120 2300 0.3720 95 118 170 0.3600 0.4460 0.4740 0.4820 158 1100 3. (Sato) Using the Graphical method and the data presented above, determine the flow equalization volume, and compare the result from the method described by Davis and Cornwell.Explanation / Answer
Q1 Q = CH n
C = 12.00 for 3' width
n = 1.57 for 3' width
Q = 12*3.5 1.57
= 85.77 cfs
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