2. The surface area of a reservoir is 17.2 square miles and is underlain by impervious strata. In August the average surface flow out was 3,190 cfs. No rainfall and evaporation of 4.8 inches were recorded for the month and the storage volume decreased by 142,000 acre- feet. (a) Write out the surface water hydrologic budget for the reservoir explaining why you neglect any terms. (b) Estimate the flow into the lake in acre-feet and cfs.

2. The surface area of a reservoir is 17.2 square miles and is underlain by impervious strata. In August the average surface flow out was 3,190 cfs. No rainfall and evaporation of 4.8 inches were recorded for the month and the storage volume decreased by 142,000 acre- feet. (a) Write out the surface water hydrologic budget for the reservoir explaining why you neglect any terms. (b) Estimate the flow into the lake in acre-feet and cfs.

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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The Occoquan Reservoir watershed area is 623 sq mi. In a given month, thewatershed received 5.5 inches of precipitation and the average inflow in the reservoir measuredin gages located in the main tributaries was 1,005 cfs. The reservoir has a surface area of2,100 acres and the average evaporation rate for this month is 4 inches. The outflow due to watersupply for part of Prince William and Fairfax counties population is 26 cfs, and the average damoverflow was 626 cfs.a) How many inches of runoff reached the river during this month?b) Compute the water losses in the watershed due to combined effects of evaporation,transpiration, and infiltration (inches).c) What was the change in the storage in the reservoir during this month in inches?
#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.
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.?
6. Runoff from a 200 mile² catchment drains into a reservoir than has an average surface area of 4000 acres. The reservoir is to be used for municipal water supply. Annual rainfall over the watershed is 40 inches and the annual runoff is 2 inches. Evaporation from the reservoir averages 40 inches per year. If the surface area of the reservoir is roughly constant with depth, how much will the reservoir depth change in one year?
A given storage reservoir has a normal pool area of 4,000 acres and serves a drainage area of 200 mi2 (i.e. the 4,000 acre reservoir is within the 200 mi2 watershed). During an average year, rainfall is 37 in, runoff is 10 in, and reservoir evaporation is 30 in. Determine the net change in storage of the reservoir during the year if a local municipality is allowed to take 100 MGD from the reservoir. You may neglect infiltration and see page from the reservoir. Express your answer in acre-ft.
A reservoir is located at the outlet of a 150 sq. mile watershed. Water budget data are: Mean annual rainfall over the region = 38 inches Mean annual watershed runoff = 13 inches Mean annual reservoir evaporation = 49 inches Mean daily withdrawal from reservoir = 100 MGD If the mean Feservoir surface area is 4000 acres, determine: (a) Volume of water evaporated from lake in acre-ft./yr. (b) Watershed runoff or inflow into the reservoir in acre-ft./yr. (c) Watershed runoff or inflow into reservoir in cfs (d) Volume of rainfall input to reservoir in acre-ft./yr. (e) Mean withdrawal/draft from the reservoir in acre-ft./yr. (f) Net loss/gain of reservoir storage in acre-ft./yr.
4. A reservoir has an average area of 50 km over a year. The normal annual rainfall at the place is 120 cm and the class A pan evaporation is 240 cm. Assuming the land flooded by the reservoir has a runoff coefficient of 0.4, estimate the net annual increase or decrease in the streamflow as a result of the reservoir. (Problem 3.3, Subramanya 4th Ed.)
We are to determine the seepage (infiltration) in a 250 hectare reservoir. The reservoir has 0.50 m^3/s of inflow, 0.3 m3/s of outflow, and total storage increase of 19600 m^3. A discharge of 0.1 m^3/s of water is coming out of reservoir to be used for irrigation of the around farms AUSGS gage next to the lake reservoir recorded a total of 20 mm Precipitation for the lake for a week. The evaporation loss, in mm is 24mm.T-0. Calculate the leakage (seepage) in mm for a week from this dam reservoir.(use 4 decimal in your answer donot put unit) e.g. 3.456mm put 3.4560 in your answer
a) Table shows total rainfall for each month of the year 2012 for a 200 m² sub- basin located upstream. If the average daily evaporation is considered as 2 mm/day throughout the year and total runoff generated is 70% of the total rainfall, determine the amount of water stored or infiltrate in the sub-basin on average each month in unit m?. Consider the rainfall to be uniformly distributed across catchment and use 30 days for each month in the calculation. Month 4 5 6 1 2 7 8. 10 11 12 Total rainfall (mm) 45 14 24 13 20 24 17 25 21 37 43 65
A small public well is used to supply drinking water to a small residential community located in a 26 square kilometer watershed. For the month of June, the measured rainfall was 12 cm, the estimated evapotranspiration was 7.5 cm and the surface water runoff entered a small stream with an average flow of 0.32 m3/sec that leaves the watershed. Estimate the average flow (m3/day) from the public well without depleting the underlying aquifer (neither gains nor loses water). Assume that all water that infiltrates will percolate to the aquifer. There is no baseflow.
Problem 4 A lake with a surface area of 750 acres was monitored over a period of time. During a one- month period, the inflow was 35 cfs, the outflow was 28 cfs, and a 1.5-in. seepage loss was measured. During the same month, the total precipitation was 4.8 in. Evaporation loss was estimated as 6.0 in. Estimate the storage change for this lake during the month.
1.6. A lake with a surface area of 1260 acres was monitored over a period of time. During a one-month period, the inflow was 36 cfs, the outflow was 30 cfs, and a 1.6-in. seepage loss was measured. During the same month, the total precipita- tion was 4.3 in. Evaporation loss was estimated as 6.0 in. Estimate the storage change for this lake during the month.