1. Find area precipitation by isohyetal method for a certain catchment area given the followingdataIsohyets, cmP 6.854PS 312/2P1.5DEPARTMENT OF CIVIL ENGINEERINGCCB 433 - Fluid Mechanics for Civil EngineersTutorial 1 August 20220Time, minRainfall, em+ 602Area enclosed within catchmentboundary, km2. A catchment has six rain gauge stations. In a year, the annual rainfall recorded by the gauges are asfollows:Station100AFRainfall, mm86.3102.7For a 10% error in the estimation of mean rainfall, calculate the optimum number of stations in thecatchment903.1868163. From the precipitation data given, estimate cumulative rainfall and rainfall intensity.Time, min4060500.32 0.37 0.43Rainfall, cm-BCD108.9 154.2 78.3100.1820972134106026331001.65+002+152200.211975300.26120 1300.261100.81 0.526+52P = A₁Athal-1975P₂• (Pi+ P² ] + An [Po+Pr+A₂Atotal+ (33E93.1+971400.4221500.365+470800.64 1.14160 1700.280.19+ 21341321800.17+4403+22

Given data in question Isohytes values in cm Area enclosed in km2 To find out Mean area…

1. Find area precipitation by isohyetal method for a certain catchment area given the following data + A₂ Isohyets, cm P₁ 6.8 6 24 5 4 PS 3 22 Pr. 1.5 P = 0 Time, min Rainfall, cm Area enclosed within catchment boundary, km 0 0 + 602 2. A catchment has six rain gauge stations. In a year, the annual rainfall recorded by the gauges are as follows: Station B D F A C 86.3 108.9 154.2 78.3 Rainfall, mm 102.7 For a 10% error in the estimation of mean rainfall, calculate the optimum number of stations in the catchment 6816 3. From the precipitation data given, estimate cumulative rainfall and rainfall intensity. Time, min Rainfall, cm 10 0.18 100 90 3.18 1.65 20 97 213 410 602 633 +00 2+15 20 0.21 30 0.26 1975 120 110 0.81 (Pit P=A₁ (P₁+f 2 Atotal = 1975 6+5 2 E 93.1 140 130 0.52 0.26 0.42 + (33 40 50 0.32 0.37 +97 Atotal 2 60 70 80 0.43 0.64 1.14 150 160 0.36 0.28 544 [1]. P₂1 Ps 2 +213 170 0.19 413 2 180 0.17 +4410 342 2

1. Find area precipitation by isohyetal method for a certain catchment area given the following data + A₂ Isohyets, cm P₁ 6.8 6 24 5 4 PS 3 22 Pr. 1.5 P = 0 Time, min Rainfall, cm Area enclosed within catchment boundary, km 0 0 + 602 2. A catchment has six rain gauge stations. In a year, the annual rainfall recorded by the gauges are as follows: Station B D F A C 86.3 108.9 154.2 78.3 Rainfall, mm 102.7 For a 10% error in the estimation of mean rainfall, calculate the optimum number of stations in the catchment 6816 3. From the precipitation data given, estimate cumulative rainfall and rainfall intensity. Time, min Rainfall, cm 10 0.18 100 90 3.18 1.65 20 97 213 410 602 633 +00 2+15 20 0.21 30 0.26 1975 120 110 0.81 (Pit P=A₁ (P₁+f 2 Atotal = 1975 6+5 2 E 93.1 140 130 0.52 0.26 0.42 + (33 40 50 0.32 0.37 +97 Atotal 2 60 70 80 0.43 0.64 1.14 150 160 0.36 0.28 544 [1]. P₂1 Ps 2 +213 170 0.19 413 2 180 0.17 +4410 342 2

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. 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…
81 1 Ab P YN ~ The ordinates of 1-hr UH for a catchment (ar 4 5. km) are given below UH coordinates Time | UH coordinates (m/s) p (m’/s) Time (hr) | | z_| 3 | a_ | [ [ 0.08 (a) Determine the S-curve hydrograph for the excess rainfall of unit intensity (1 mm/hr). (b) Find out the ordinates of 2-hr UH (1 mm) using S-curve and ion methods. Dr.Musa Alshamari 9:52p 4=Wd121.07.06 / < 1]} @) > 8
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Q1. Using the data given, estimate precipitation depth that has fallen on the entire watershed. Precipitation (mm) Polygon Thiessen area (cm2) Station A 20 112.25 13 53.5 C 18.3 120.0 12.5 62.5 E 10 119.0 F 5.8 144.0 G 6.7 72.0 14.8 130.0 13.9 62.5 11 85.0 K 5.5 110.0 3.7 40.0 WE PRODUCE PROFESSIONALS With Wisdom, W6 EY82re GUTHM Q2. Lines delineating a particular measurement are drawn within the watershed. Precipitation data and the area in between each isohyet are shown in the table below. Estimate the average precipitation within this watershed. Isohyetal line (cm) Area (cm?) 30 - 40 40 - 50 50 - 60 60 - 70 70 - 80 80 - 90 90-100 32 162 155 92 228 120 65