Problem 8: Consider the water balance of a reservoir during the last 6 weeks of a...

Transcribed Image Text:

Problem 8: Consider the water balance of a reservoir during the last 6 weeks of a long dry season. The reservoir is receiving water from one river only. The river discharge into the reservoir in 6 week period is shown in table. The surface area of the reservoir is 20 km and the sides of the reservoir are vertical. 0 Week Q(mm/week) 3 4,24 5 2,39 10 a. Compute for each week the rise of the water level in the reservoir due to the inflow of river water only. b) Week Level (m) 1 7,51 The following precipitation (P) and evaporation (E) data (mm/week) apply for the 6-week period. Week 1 2 3 4 5 6 P 0 23 0 40 0 0 40 40 0 45 45 45 E At the dam site water is released with a constant rate of 5 m/s. There are no other significant flows that should be considered for the water balance of the reservoir. 0 0 b. Compute the water level in the reservoir at the end of each week given a water level of 20 m above mean sea level at the start of the 6 week period. Ans: a) Week mm/week 0 20 2 5,64 1 264.6 1 20.07 2 199.0 2 20.08 4 3,18 3 149.0 3 20.04 4 112.2 4 19.96 6 1,8 5 84.1 5 19,84 6 63.5 6 19.73 Problem 8: Consider the water balance of a reservoir during the last 6 weeks of a long dry season. The reservoir is receiving water from one river only. The river discharge into the reservoir in 6 week period is shown in table. The surface area of the reservoir is 20 km and the sides of the reservoir are vertical. 0 Week Q(mm/week) 3 4,24 5 2,39 10 a. Compute for each week the rise of the water level in the reservoir due to the inflow of river water only. b) Week Level (m) 1 7,51 The following precipitation (P) and evaporation (E) data (mm/week) apply for the 6-week period. Week 1 2 3 4 5 6 P 0 23 0 40 0 0 40 40 0 45 45 45 E At the dam site water is released with a constant rate of 5 m/s. There are no other significant flows that should be considered for the water balance of the reservoir. 0 0 b. Compute the water level in the reservoir at the end of each week given a water level of 20 m above mean sea level at the start of the 6 week period. Ans: a) Week mm/week 0 20 2 5,64 1 264.6 1 20.07 2 199.0 2 20.08 4 3,18 3 149.0 3 20.04 4 112.2 4 19.96 6 1,8 5 84.1 5 19,84 6 63.5 6 19.73