(b) At the beginning of the month of June, water level of a reservoir with surface areaof 7km? was at 20m (Refer to reservoir characteristic curve in Figure Qla).Average longterm monthly rainfall for the month of June recorded at fiveraingages is summarized in Table Q1 (assuming the same average amount ofrainfall is also recorded in the reservoir). The inflow to the reservoir X, located atthe downstream catchment outfall, resulted from that rainfall can be estimated asQin =0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon)from a 36km² catchment area A, schematically shown in Figure 1b. An averagemonthly withdrawal of 6MCM from the reservoir is required for water supplypurpose. Assume there is no losses from the reservoir except evaporation at120cm/year. Determine the volume of water required to be pumped into thereservoir in that specific month to achieve a safe operating level at 21m.80706050V = 4.7H - 7040302010Note: MCM is million m'5101520253035Water Level, H (m)Figure Qla: Reservoir characteristic curveVolume, V (MCM) Table Q1: Average monthly rainfallARaingaugeABDMonthly rainfallin June (cm)Thiessen polygonarea (%)101815815403312DReservoir XFigure 1b: Location of reservoir at catchment outfall

Catchment Area: A catchment is a space of land where water gathers when it downpours, regularly…

) At the beginning of the month of June, water level of a reservoir with surface area of 7km² was at 20m (Refer to reservoir characteristic curve in Figure Qla). Average longterm monthly rainfall for the month of June recorded at five raingages is summarized in Table Q1 (assuming the same average amount of rainfall is also recorded in the reservoir). The inflow to the reservoir X, located at the downstream catchment outfall, resulted from that rainfall can be estimated as Qin =0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon) from a 36km² catchment area A, schematically shown in Figure Ib. An average monthly withdrawal of 6MCM from the reservoir is required for water supply purpose. Assume there is no losses from the reservoir except evaporation at 120cm/year. Determine the volume of water required to be pumped into the reservoir in that specific month to achieve a safe operating level at 21m. 80 70 60 50 V = 4.7H - 70 30 20 10 Note: MCM is million m' 10 15 20 25 30 35 Water Level, H (m) Volume, V (MCM)

) At the beginning of the month of June, water level of a reservoir with surface area of 7km² was at 20m (Refer to reservoir characteristic curve in Figure Qla). Average longterm monthly rainfall for the month of June recorded at five raingages is summarized in Table Q1 (assuming the same average amount of rainfall is also recorded in the reservoir). The inflow to the reservoir X, located at the downstream catchment outfall, resulted from that rainfall can be estimated as Qin =0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon) from a 36km² catchment area A, schematically shown in Figure Ib. An average monthly withdrawal of 6MCM from the reservoir is required for water supply purpose. Assume there is no losses from the reservoir except evaporation at 120cm/year. Determine the volume of water required to be pumped into the reservoir in that specific month to achieve a safe operating level at 21m. 80 70 60 50 V = 4.7H - 70 30 20 10 Note: MCM is million m' 10 15 20 25 30 35 Water Level, H (m) Volume, V (MCM)

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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Question: Four rain gauge stations A, B, C, and D in a catchment area have a recorded 10, 15, 20 and 25 cm respectively. If their Thiessen weights at stations A, B, and C are 0.1, 0.2, 0.3 respectively, the average depth of rainfall on the catchment is
Following is the recorded data of a 0.8 km2 wide lake collected over a year: It receives a total rainfall of 1400 mm, the surface inflow and outflow is 0.15 m3/s and 0.17m3/s respectively. If the surface elevation of lake reduces by 45 mm over the year, then determine the lake evaporation (in mm).
Estimate the constant rate of withdrawal from a 1375 ha reservoir in a month of 30 days during which thereservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 0.5 Mm^3/day. During themonth, the average seepage loss from the reservoir was 2.5 cm, total precipitation on the reservoir was 18.5 cmand the total evaporation was 9.5 cm.
A total of 10 mm of rainfall fell on a lake with a surface area of T km^2 in June 1996. Relatedthe average flow rate of the stream entering the lake per month is 12 m^3 / s, while the average flow rate of the stream leaving the lake is7m^3/s dir. Monthly evaporation height measured in an evaporation pan near the lake during this month45mm and the pan coefficient in the relevant month is 0.75 according to what is the volume of water in the lake in this monthcalculate that it has changed up to?(T=159)
Using Station Average Method, find the average rainfall over a catchment with the following data: 14.4mm, 32.2mm, 41.3mm 10.4mm, 28.10mm, 21.2mm, and 16.2 mm
a) Estimate the constant rate of withdrawal from a 1375 ha reservoir in a month of 30 days during which thereservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 0.5 Mm3 /day. During themonth, the average seepage loss from the reservoir was 2.5 cm, total precipitation on the reservoir was 18.5 cmand the total evaporation was 9.5 cm.
1. The normal annual rainfall at stations A, B, and C situated in meteorologically homogeneous region are 175 cm, 180 cm, and 150 cm respectively. In the year 2020, station B was inoperative and stations A and C recorded annual precipitations of 150 cm and 135 cm, respectively. What is the estimate annual rainfall at station B in that year?
Using arithmetic mean method, find the average rainfall over a catchment. The rain gauge data is: 12.6, 18.8, 14.8, 10.4, and 16.2mm.
Find the average rainfall over a catchment with the Thiessen polygon method.
Compute the average outflow from a 550 hectare river for 15 days period during which the river level dropped half a meter despite an average upstream inflow of 200000m^3/day.During the period, the total seepage loss was 2cm,the total precipitation was 15cm, the total evaporation was 4 cm. Answer must be in cm.
A 6-hour rain of average intensity 2 cm/hour falls over the fern leaf type catchment as shown in Figurebelow. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours,respectively, to the site 0 where the discharge measurements are made. The values of the runoffcoefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attain aconstant value of 0.8 after 3 hours. Draw surface runoff hydrograph from the runoff collected from thecatchment and also calculate volume of direct Runoff.
Problem 1: Water BalanceMeasurements of water-balance components have been made for a one-year period on a lake with an area of 0.8 km2 with the following results: P = 1400 mm, Qsi = 0.15 m3 s-1, and Qso = 0.17 m3 s-1. The lake-surface elevation, h, at the end of the year was 45 mm lower than at the beginning. What is the estimate (in mm) of the lake evaporation for that year?