1.The evaporation losses from a reservoir with a surface area of 500 acres are 150 Ac-ft per day. Ifthe average outflow from the reservoir is 50 cfs during the day, determine the change in waterlevel from the reservoir (in feet, indicate whether it increases or decreases). You may assumethere are not any streams flowing into the reservoir.If the reservoir described above received precipitation of 3 inches over the course of a day,calculate the change in water level (in feet, indicate whether it increases or decreases).

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Answered: 1. The evaporation losses from a…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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#1 The long-term average annual precipitation (P) over a reservoir (surface area = 186 mi) is 40 in/yr. The average streamflow (Q) flowing out of the reservoir is 188 ft³/s. Estimate the average. annual evaporation (E) from this reservoir assuming changes in storage and losses are negligible.
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During a 24-hr time period, the inflow to a 500-acre vertical walled reservoir was 100 cfs. During the same interval, evaporation was 1 in. Was there a rise or fall in surface water elevation? How much was it? Give the answer in inches and centimeters
(a) For a given year, a catchment with an area of 3000 km? received 160 cm of precipitation. The average flow rate measured in the river draining the catchment was 40 m³/s. Find DRO" (i) How much runoff reached the river for the year (in m')? TRO = P+A (ii) Estimate the amount of water lost due to the combined effects of evapotranspiration and infiltration etc (in m')? (iii) How much precipitation is converted into river runoff (in percentage)? 26. (iv) What is the ratio of runoff to precipitation?
A drainage basin has a area of 7322 km2. The average annual precipitation for this area is 909 mm. The average surface water flow at the outlet of the catchment is 21.4 x 108 m3/year and the average groundwater flow out of the basin is 94.6 mm/year. Assume trailing zeros are significant if present. Determine the annual average evaporation in mm/year. (give your answer to one decimal place)
Estimate the constant rate of withdrawal from a 1375 ha reservoir in a month of 30 days during which the reservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 500,000 m 3 /day. During the month the average seepage loss from the reservoir was 2.5 cm, total precipitation on the reservoir was 18.5 cm and the total evaporation was 9.5 cm. (answer must be in m^3/s with step by step solution)
find the following : 1- Inflow discharge (cm/6-months) = ? 2- ΔS (cm/6-months)= ? 3- Evaporation (in/6-months) = ? 4- Evaporation (L/6-months) = ?
Estimate the constant rate of withdrawal from a 1375 hectare reservoir in a month of 30 days during which the reservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 0.5 cum/day. During the month the average seepage loss from the reservoir was 2.5 cm, total precipitation on the reservoir was 18.5 cm and the total evaporation was 9.5 cm. O a. 6.191 cu.m./s O b. 5.191 cu.m./s O c. 9.161 cu.m./s O d. 6.911 cu.m./s
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A reservoir is in a region where the average annual precipitation is 3106 mm and normal annual US class A pan evaporation is 3456 mm. The average area of reservoir water surface is 50 km2. If under conditions of 30% of the rainfall on the land occupied by the reservoir runoff into the stream, estimate the net annual increase or decrease in the stream flow. Assume suitable pan evaporation coefficient.?
17. The inflow inters to a lake (50km2) during a (6 months) is (25 m3/sec), the precipitation over this lake is (8cm). Depression storage is (18*10^6 m3) and infiltration is (1.5cm). Find the total evaporation from this lake during this time? Express your answer in (in).

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