Answer Happy

QUESTION 4 (20 marks) A reservoir has a plan area of 100,000 m². Discharge from the reservoir panes over 15 m wide rectangular broad-crested weir, with dimensions as depicted in Figure (4 V 1m 2m Figure 04 a. Estimate the weir discharge if the reservoir level is I m above the crest. State the flow condition over the structure in using the appropriate equation/formula. (4 marks) b. If there is no inflow into the reservoir, compute the time taken for the reservoir level to fall from 1 to 0.5 m above the weir crest. Assume Ca remains constant. (8 marks) c. If there is 10 m³/s inflow into the reservoir, evaluate the time taken for the reservoir level to fall from 1 to 0.3 m above the weir crest. Assume C remains constant. (6 marks) d. If Ca is not constant and varies with reservoir level, describe its effect on the solution for Question 4b. (2 marks)