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

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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
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
2
180
0.17
+440
3+2
2
Transcribed Image Text: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 2 180 0.17 +440 3+2 2
Expert Solution
Step 1

Given data in question 

Isohytes values in cm

Area enclosed in km2

To find out 

Mean area precipitation using Isohyetal method

steps

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