PROBLEM: Find the average rainfall by using Isohyetal method for a squarecatchment area, bounded at the corners by four gage stations. Plot the isohyetsas straight lines and assume an isohyet interval of 1 cm. The coordinates of thestation and rainfall values are given below. Show the diagram and the tabulatedsolution in your paper.(Final answer until 3-decimal places only. Indicate the unit)Station1234(50, 80) (100, 80) (50, 20)(100, 20)Coordinates, kmRainfall, cm133Your answerThis is a required question

Average precipitation is the average in the area where rainfall occurs to measure this there are…

Answered: PROBLEM: Find the average rainfall by…

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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#3 E The rainfall was recorded at the network of stations over a trapezoidal watershed (see figure below). Determine and compare the average rainfall using: b) Thiessen polygon method Station ABCDEFG Precipitation (in.) 2.8 3.5 4.2 5.1 6.0 4.5 öö 3.9 85 mi 5 ml A 5 ml D 20 mi 5 mi в. 20 mi- 20 mi $5 mi 115 mi-. E 45 mi I 55 ml 45 mi 5 mi F G 5 mi 25 mi
What will be rainfall intensity of 5 yr-rainfall of duration 1 hr. if following details are given : 5.82, x = 0.16; a = 0.4; n = 0.75 [1.40.75 1.287; 50.16 1.29] K = = =
Q4: Following is shown map of catchment having 12 rainfall stations. Find the Average Precipitation over the whole Catchment. Solve the interior square by Isohyetal method and remaining with Theisen Polygon Method. Y Km x 4 Km Aineg = P,='45 mn 2 km x 2km Piy = lormm Pg 70mm Py.- 6omm Psz 65 mm Ps- 20mm Prz 75am
Prob.4. There are four rain gauge stations existing in the catchment a river. The average annual rainfall values at these stations are 800, 620. 400 and 600 mm respectively - (i) Determine the optimum number of rain gauges in the catchment, if it is desired to limit the error in the mean value of rainfall in the catchment to 10%. (ii) How many more gauges will then be required to be installed ? of 100 L 600
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…
Develop the equation relating rainfall intensity-duration for the following 10-year frequency rainfall data using Talbot's formula. Duration (min) 10 20 40 60 120 180 Intensity (mm/h) 47 55 35 15 25 18 6. [CLO-2] (04)
Problem 2: A square shape catchment with 100 km² area has five raingauge stations at the center of the catchment (A) and center of each side of basin (B, C, D and E). Each station has certain rainfall recorded which are given in Table below. Compute the mean precipitation applying Thiessen-mean method. Station A B с D E P (mm) 24 20 30 35 D Ud Å E B 5 15
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…
QUESTION For a 2-hour, 10 mm/h intensity rainfall, the hydrograph given in Table is observed. The area of watershed is 400 km². Table; Propeller Readings Time 0 2 4 6 8 10 12 Flow Rate (m³/s) 16 22 26 38 53 46 36 14 16 18 32 36 22 a) Obtain 2-hour unit - hydrograph for the considered flow section. 20 22 24 18 16 16
Using a rainfall of 386 mm for rain gauge Station D, determine the average depth of rainfall that fell for the watershed using the arithmetic average, and Thiessen polygon method. The areas for the Thiessen polygon method are given in the table above for each station. Determine the average depth of rainfall for a watershed using the isohyetal method given the data below. Isohyet (mm) Area Associated (km²) 30 - 40 20 20 - 30 45 10 - 20 35 under 10
Test yourself! Calculate average rainfall for this catchment. Zone 1 2 3 4 total *Answers will be provided at the end of this video Area (km²) 350 300 250 100 1000 30 35 27 30 34 ● 39 40 42.
A watershed has five non-recording rain gauges, installed in its area. The amount of rainfall recorded for one of the years is given below: Rain gauge station | || ||| IV V Annual rainfall in cm 100 120 190 95 125 Find the required optimum number of non-recording and recording rain gauges for this watershed. Assume an error of 10% in the estimation of mean rainfall.

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