2.16 The record of annual rainfall at a place is available for 25 years. Plot the curve ofrecurrence interval vs annual rainfall magnitude and by suitable interpolation estimatePrecipitation 69the magnitude of rainfall at the station that would correspond to a recurrence intervalof (a) 50 years, and (b) 100 years.Annual RainfallAnnual RainfallYear(ст)Year(ст)1950113.0196368.6195194.5196482.5195276.0196590.7195387.5196699.8195492.7196774.4195571.3196866.6195677.3196965.0195785.1197091.01958122.81971106.8195969.41972102.2196081.0197387.0196194.5197484.0196286.3

Rainfall intensity is defined as the ratio of the total amount of rain falling (rainfall depth)…

Answered: 2.16 The record of annual rainfall at a…

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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:A-Explain the following briefly Two only. 1-The methods of determination of average precipitation over an area. 2-What are the factors affecting flood Hydrograph? 3-What are the basic assumptions for deriving the unconfined aquifer equations? B: The normal annual precipitation of five rain gauges stations P, Q, R, S and T are 120, 100, 80, 110, and 140 cm respectively. During a particular storm the precipitation recorded by stations P, Q, R, and S are 15, 10, 7, and 11 respectively, the instrument at station T was inoperative during the storm. Estimate the rainfall at station T during the storm.
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
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
Q1: The table below represents the annual average rainfall (mm) for each station A with the average of eight other stations for the period between 1946 and 1967. Check the homogeneity of the records for station A with the other stations and then correct the information using the double cumulative curve method, explaining: A In what year does a change in the fall rate system occur? Which years need to adjust readings? she bwhat C- What is the value of the correction factor for heterogeneous years? station Average 8 station rate 8 stations the your the year A stations A 158 1957 143 177 1946 145 1958 132 144 1947 132 1959 146 178 1948 95 1960 147 162 1949 148 1961 161 194 1950 142 1962 155 168 1951 140 1963 152 196 1952 130 1964 117 144 1953 137] 1965 128 160 1954 130 1966 193 196 1955 163 1967 156 141 1956 164 155 143 115 135 163 135 143 130 146 161
a basin, six rain gauges stations are reporting rainfall in a year.The annual rainfall recorded by gauges are: E F Station A C 68 Rainfall cm) 50 41 32 For 80 % error in estimation of mean rainfall, calculate the optimum no. of rain gauge stations in the basin. B 51 D 55
The data below represents the accumulative annual rainfall for station A and the accumulative average annual rainfall measured at a set of 6 neighboring meteorological stations. Find is there any consistency of data between the station A and the other stations by using double mass curve. * Year Accumulative at Accumulative at 6 station A stations 1990 40 340 1991 400 560 1992 1000 880 1993 1360 1078 1994 1720 1260 1995 2000 1440 1996 2515 1720 1997 3260 2138 1998 3600 2340 1999 4040 2600
In a catchment, there are four rain-gauge stations, P, Q, R, and S. Normal annual precipitation values at these stations are 780 mm, 850 mm, 920 mm and 980 mm respectively. In the year 2013, stations Q, R, and S, were operative but P was not. Using the normal ratio method, the precipitation at station P for the year 2013 has been established as 860 mm. If the observed precipitation at station Q and R for the year 2013 were 930 mm and 1010 mm, respectively; what was the observed precipitation (in mm) at station S for that year?
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…
A catchment has seven rain gauge station. In a year, the annual rainfall recorded by the gauges are as follows: Station R U V Rainfall 130.0 142.1 118.2 108.5 165.2 102.1 146.9 (cm) For a 5% error in estimation of the mean rainfall, calculate the minimum number of additional station required to be established in the catchment. (Ans. 5)
(B)- For the area shown in the figure find the mean rainfall by Thiessen Polygon method if the value of the annual rainfall was given in the following table. Station Annual Rainfall (cm) P 110 Q 125 R 120 S 125 Pa R Q 10 km
The annual rainfall at the rain-gauge stations with the catchment area of 10km are indicated below. Thiessen polygon measured are also shown in the table below. Stations Recorded rainfall(P1)(cm) Area of polygon(ai)(km2) A 8.8 570 B 7.6 920 C 10.8 720 D 9.2 620 E 13.8 520 F 10.4 550 G 8.5 400 H 10.5 650 I 11.2 500 J 9.5 350 K 7.8 520 L 5.2 250 M 5.6 350 1. Describe mean rainfall over the area using Thiessen polygon method and Compare Thiessen polygon method with arithmetic mean method.
Ql: (4 Points) Answer the following questions by True or False: 1. An increase in the relative humidity increases evaporation. 2. In general the storm duration increases the rainfall intensity decreases. 3. The double mass curve technique is adopted to check the intensity of rainfall data. 4. Interflow is the flow that reaches a stream from groundwater. ation

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