(a) A catchment area has 5 rain gauge stations with annual recorded data for year 2010 in Table Q2-1. (i) Determine the standard error in the estimation of mean rainfall. (6 marks) (ii) Calculate the optimum number of rain gauge for a 10% error of mean rainfall. (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.
(a) A catchment area has 5 rain gauge stations with annual recorded data for year 2010 in Table Q2-1. (i) Determine the standard error in the estimation of mean rainfall. (6 marks) (ii) Calculate the optimum number of rain gauge for a 10% error of mean rainfall. (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.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Table Q2-1 (b): Mean rainfall in rain gauge stations
E
Station
A
D
Rainfall (mm)
1103
1208
956
1214
1425
Transcribed Image Text: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.
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