7A small urban watershed located in north of Iraq hasfour rainfall gauges as located in the figure below. Thetotal rainfall recorded at each gauge during a stormevent is listed. Compute the average rainfall for thisstorm using Thiesson method.RaingaugeABCDRainfall (cm)8.287.427.657.75kmK4 km1 kmD4 km4 km3 kmTranscribed Image Text: A small urban watershedlocated in north of Iraq has four rainfall gauges aslocated in the figure below. The total rainfall recordedat each gauge during a storm event is listed. Computethe average rainfall for this storm using Thiessonmethod. Raingauge Rainfall (cm) 8.28 7.42 7.65 7.75 B 4km 4 km 1 km 4 km 4 km 1 km 3 km

The Thiessen method is a commonly used technique in hydrology to calculate the average rainfall over…

Answered: 7 A small urban watershed located in…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

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Problem 1P

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A small watershed has four rainfall gages located in the figure below. Total rainfallrecorded at each gage during a storm event is listed in the table. Compute the mean areal rainfallfor this storm using (a) arithmetic averaging and (b) the Thiessen method.
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Monthly point rainfalls due to a storm at rain-gauge stations A, B, C, D and E in a Waterval basin are shown in Fig. 3. Suppose the station D was not in operative for long period of time. The recorded annual rainfalls for stations A, B, C and E are 91.7, 76.2, 82.5 and 66.8 mm, respectively. 4.1. Calculate the scale of the map 4.2. Determine the average areal depth of rainfall over the basin using the: (a) Arithmetic Mean method (b) Theison Polygon Method 4.3. Estimate the annual rainfall at station D using: (a) Comparison Method (b) Normal Ratio Method km 60 C 7.2 mm 40 B 6.8 mm 75mm 20 0 Figure 3 D 7.8 mm E 6.8 mm (km)
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Advance civil engineering
1. Find area precipitation by isohyetal method for a certain catchment area given the following data Isohyets, cm P 6.8 S 4 PS 3 12/2 P1.5 DEPARTMENT OF CIVIL ENGINEERING CCB 433 - Fluid Mechanics for Civil Engineers Tutorial 1 August 2022 O Time, min Rainfall, em + 602 Area enclosed within catchment boundary, km 2. A catchment has six rain gauge stations. In a year, the annual rainfall recorded by the gauges are as follows: Station 10 0 A F 102.7 Rainfall, mm 86.3 For a 10% error in the estimation of mean rainfall, calculate the optimum number of stations in the catchment 90 3.18 6816 3. From the precipitation data given, estimate cumulative rainfall and rainfall intensity. Time, min 40 60 50 0.32 0.37 0.43 Rainfall, cm - 10 0.18 20 97 213 410 602 633 100 1.65 B C D E 108.9 154.2 78.3 93.1 +00 2+15 2 20 0.21 1975 30 0.26 120 130 0.26 110 0.81 0.52 P = A₁ 6+5 2 Athal-1975 P₂ • (Pi+ P² ] + An [Po+Pr+ A₂ Atotal + (33 +97 140 0.42 2 150 0.36 5+4 70 80 0.64 1.14 160 170 0.28 0.19 + 213 413…
1. Find area precipitation by isohyetal method for a certain catchment area given the following data Isohyets, cm P 6.8 5 4 PS 3 12/2 P1.5 DEPARTMENT OF CIVIL ENGINEERING CCB 433 - Fluid Mechanics for Civil Engineers Tutorial 1 August 2022 0 Time, min Rainfall, em + 602 Area enclosed within catchment boundary, km 2. A catchment has six rain gauge stations. In a year, the annual rainfall recorded by the gauges are as follows: Station 10 0 A F Rainfall, mm 86.3 102.7 For a 10% error in the estimation of mean rainfall, calculate the optimum number of stations in the catchment 90 3.18 6816 3. From the precipitation data given, estimate cumulative rainfall and rainfall intensity. Time, min 40 60 50 0.32 0.37 0.43 Rainfall, cm - B C D 108.9 154.2 78.3 10 0.18 20 97 213 410 602 633 100 1.65 +00 2+15 2 20 0.21 1975 30 0.26 120 130 0.26 110 0.81 0.52 6+5 2 P = A₁ Athal-1975 P₂ • (Pi+ P² ] + An [Po+Pr+ A₂ Atotal + (33 E 93.1 +97 140 0.42 2 150 0.36 5+4 70 80 0.64 1.14 160 170 0.28 0.19 + 213 413…
Hydrology Subject: Using Arithmetic Method, Thiesen Polygon Method and Isohyets Method, Find average rainfall over a catchment. The data is
The table below lists rainfall data recorded at aUSGS gage for the storm of September 1, 1999. Thebasin area is 2050 acres. Using these data, developa mass diagram (in vs. t) and a rainfall hyetograph(in./hr vs. t) in 15-min intervals and determine thetime period with the highest intensity rainfall.
The annual rainfall at the rain-gauge stations with the catchment area of 10km are indicated below. Thiessen polygon measured are also shown in the table below. Stations Recorded rainfall(P1)(cm) Area of polygon(ai)(km2) A 8.8 570 B 7.6 920 C 10.8 720 D 9.2 620 E 13.8 520 F 10.4 550 G 8.5 400 H 10.5 650 I 11.2 500 J 9.5 350 K 7.8 520 L 5.2 250 M 5.6 350 1. Describe mean rainfall over the area using Thiessen polygon method and Compare Thiessen polygon method with arithmetic mean method.
4. Rainfall values observed at different points on a watershed (12.5 km?) are shown in Figure 4.14. Compute the mean rainfall using the Thiessen method. 80 tog 105 11 90 I 10 12 13 Scale: 0.5 1.0 km FIGURE 4.14 Thiessen polygon method for computing the mean areal rainfall for Problem 4. 1.5842 0.1697 1.4208 0.9565 1.3765 1.2288 1.6282 0.9001 7 1.8949 0.3467 0.4347 10 0.1961 0.3617 12 13 Scale: 00.5 1.0km
9.

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