Please be clear with your solution. 4. The monthly rainfall data and the respectivealtitudes for 10 rain gauges in a sub-basin of MatiRiver are shown in Table below. Calculate theaverage surface rainfall using the methods ofarithmetic mean, Thiessen and Isohyetal curves.Moreover, an adjustment of the average surfacerainfall calculated by the Thiessen method withrespect to the average elevation of the basin should bemade. The area of the basin is equal to 2940 km², andNthe average elevation of the basin is equal to 532 m.RainfallRainfallAltitude (m)Station Area (sq. km.)Interval Area (sq.km)Station(mm)(mm)65-70812267413167470-7544422207321537375-802955819232169280-854054842101421210185-9072955008352388390-95506596875828795-100327710501107194110100-10514988601038177103105-11055911682955082110-1152210877010302702940Total2940

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Answered: River are shown in Table below.…

River are shown in Table below. Calculate the average surface rainfall using the methods of arithmetic mean,Thiessen and Isohyetal curves.

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

Please be clear with your solution.

4. The monthly rainfall data and the respective
altitudes for 10 rain gauges in a sub-basin of Mati
River are shown in Table below. Calculate the
average surface rainfall using the methods of
arithmetic mean, Thiessen and Isohyetal curves.
Moreover, an adjustment of the average surface
rainfall calculated by the Thiessen method with
respect to the average elevation of the basin should be
made. The area of the basin is equal to 2940 km², and
N
the average elevation of the basin is equal to 532 m.
Rainfall
Rainfall
Altitude (m)
Station Area (sq. km.)
Interval Area (sq.km)
Station
(mm)
(mm)
65-70
8
1
226
74
1
316
74
70-75
444
2
220
73
2
153
73
75-80
295
581
92
3
216
92
80-85
405
4
842
101
4
212
101
85-90
729
5
500
83
5
238
83
90-95
506
596
87
582
87
95-100
327
7
1050
110
7
194
110
100-105
149
8
860
103
8
177
103
105-110
55
9
116
82
9
550
82
110-115
22
10
87
70
10
302
70
2940
Total
2940

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Problem 4: Use the following table to determine the areal average rainfall using (1) Arithmetic-mean method Area Rainfall represented by station (mi?) Station depth (in) 3.1 4.2 4.5 5.1 5.5 3.5 3.2 5.5 4.3 4.8 m4534 ABCDE
(ACCURATE AND ASAP PLEASE)
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 = = =
find the following : 1- Average precipitation by Arithmetic mean method (in) = ? 2- Area-3 (km^2)= ? 3- Area-2 (km^2)= ? 4- Average precipitation by Thiessen method (in)= ?
Q2. (a) A catchment area has 5 rain gauge stations with annual recorded data for in Table Q2-1. year 2010 (i) Determine the standard error in the estimation of mean rainfall. (ii) Calculate the optimum number of rain gauge for a 10% error of mean rainfall. (6 marks) (2 marks) (iii) In year 2020, mean rainfall data is obtained with 1100mm for station A, 950mm for station B, 1250mm for station C, 1150mm for station D, but station E is inoperative. (2 marks) Estimate the mean rainfall in station E by using normal ratio method.
Compute the rainfall intensity. Complete solution
A catchment has six rain gauge stations, In a year, the annual rainfall recorded by the gauges are as follows: Station R C A B F DE Rainfall (cm) 82.6 102.9 180.3 110.3 98.8 136.7 For a 10% error in the estimation of the mean rainfall, what is the optimum number of = 35.04 and ε = 10) stations in the catchment? (Take P = 118.6, om-1 1 (b) 9 (d) 7 (a) 10 (c) 8
Compute the average rainfall using the Isohyetal Method A1= 250sq.m , P1=36 10 P1 A2= 198 sq.m, P2= 49 mm (20 P2 A3= 267 sq.m, P3= 61mm P3 (30 A4= 78 sq.m, P4=19 mm
Note: Don't copy from other expert solution.
Determine average rainfall using arithmetic method
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Please be clear with your solution.