There are four raingauge stations existing in the catchment of a river. T Average annual rainfall values at these stations are 800, 620, 400 and 540 mm respectively (a) Determine the optimum number of raingauge in the catchment. (b) How many more gauges will be required to be installed. Allowable percentage error in mean value of rainfall in the catchment is 10%.

There are four raingauge stations existing in the catchment of a river. T Average annual rainfall values at these stations are 800, 620, 400 and 540 mm respectively (a) Determine the optimum number of raingauge in the catchment. (b) How many more gauges will be required to be installed. Allowable percentage error in mean value of rainfall in the catchment is 10%.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

23: A square area of 100 km² is gauged by five rainfall gauges one at the center of the area and the others at an equal distance on the boundary of the area. The data record are: Station A B D Rainfall (cm) 15 12.5 13.8 14.5 Use Two methods to estimate average rainfalls? E 13 D OF R
A watershed has five rain gauge stations. In a year, the annual rainfall recorded by rain gauges are 115.5, 106.8, 125.4, 95.6 and 90.4 cm. For a 5% error in estimation of mean rainfall, the number of additional gauges required are (in integer).
Three gauging stations A, B, and C are located inside a rectangular lot area. Each gauging station is located at the center of the circular area covered by each station as illustrated below. The radius of the circular area covered by Gauging Station A and B is 96m, and C is 12m. If the average rainfall depth in the rectangular lot area is 88mm, calculate the volume of precipitation (m3) in the area not covered by the three gauging stations. Show complete Solution.
Tutorial 4 Question 1 Based on the given annual rainfall data and the Weibull distribution, 1. develop and plot the relationship between annual rainfall and the frequency, 2. calculate the rainfall intensity with a 10-years return period, 3. calculate the exceedance probability of an event of 125 mm and 4. estimate the design rainfall for a 100-years return period. Year 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 P (mm) 70 121 92 66 74 95 06 91 90 90 | 82 96 Year 1992 1993 1994 1995 1996 997 1998 1999 2000 2001 2002 2003 2004 P (mm) 110 115 100 88 80 87 80 72 103 99 97 98
C. Isohyetal Method?
Assuming a circular watershed with radius 900km has its center at the origin. The rain gauges are located at ARG1(0,600), ARG2(300, -519.615), and ARG3(-599.479, 25). Deter- mine the estimated aerial rainfall using Thiessen Polygon method. ARG1 = 5mm, ARG2 = 12mm, ARG3 = 15mm
For the basin shown in Fig. 1, the normal annual rainfall depths recorded and the isohyetals are given. Determine the optimum number of rain-gauge stations to be established in the basin if it is desired to limit the error in the mean value of rainfall to 10%. Indicate how you are going to distribute the additional rain-gauge stations required if any. What is the percentage accuracy of the existing network in the estimation of the average depth of rainfall over the basin? The area between the isohyetals are given below:
Example4: Cumulative Rainfall depth 10 cm and cumulative runoff 5.8cm Find Ø - index if rainfall according following data : Time (hr.) 1 2 3 4 6 7 8. Rainfall intensity (cm.) 0.4 0.9 1.5 2.3 1.8 1.6 1 0.5
Q3) The average annual rainfall at (5) rain gauge stations in the catchment is as follows: Station P Q R S Average Annual Rainfall (mm) 2400 2332 2431 2207 2231 The rainfall at Station(P) was not available for the year (1996) .The rainfall observe at the other station for (1996) was as follows: Station P R S T Rainfall (mm) 2113 2200 2028 2095 Estimate that rainfall at (P) During (1996).
9.
i) Based on the unit hydrograph in Table Q4b, construct its S-Curve and develop a 1-hour Unit hydrograph. ii) Based on the unit hydrograph in Table Q4b, construct a new natural hydrograph that can be produced by a series of effective rainfall of 2.5cm, 1.1cm, and 0.3cm that occurred at one-hour intervals between one event and another.
Determine average rainfall using Arithmetic mean method