2.15 The mass curve of rainfall in a storm of total duration 90 minutes is given below.(a) Draw the hyetograph of the storm at 10 minutes time step. (b) Plot the maximumintensity-duration curve for this storm. (c) Plot the maximum depth-duration curvefor the storm.Time (Minutes)|8010 20 304050607090Cumulative rainfall 0|(mm)2.16.314.5 21.7 27.9 33.0 35.1 36.2 37.0

Time (minutes} Cumulative rainfall Rainfall (mm} Rainfall intensity (mm/hr} 0 0 0 0 10 2.1 2.1…

Answered: 2.15 The mass curve of rainfall in 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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Example 5. The inflow hydrograph readings for a stream reach are given below for which the Muskingum coefficients of K = 36 hr and x = 0.15. Route the flood through the reach and determine the outflow hydrograph. Also determine the reduction in peak and the time of peak of outflow. Outflow at the beginning of the flood may be taken as the same as inflow. Time (hr) 12 24 36 48 60 72 84 96 108 120 Inflow (cuтеc) 42 45 88 272 342 288 240 198 162 133 110 Time (hr) 132 144 156 168 180 192 204 216 228 240 Inflow (сumес) 90 79 68 61 56 54 51 48 45 42
1. The following is a rainfall record of each 5-minute interval measured during a storm: time (min) 5 10 15 20 25 30 35 40 rainfall (mm) 0.7 2.0 2.5 2.2 2.1 1.6 1.2 0.3 (1) plot the Rainfall hyetograph (2) plot the Cumulative rainfall hyetograph (3) determine the 10-minute maximum rainfall intensity? (4) determine the 20-minute maximum rainfall intensity? (5) determine the 30-minute maximum rainfall intensity?
2.6 Represent the annual rainfall data of station A given below as a bar chart with time in chronological order. If the annual rainfall less than 75% of long-term mean is taken to signify meteorological drought, identify the drought years and suitably display the same in the bar chart. Year 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 Annual rain 760 750 427 380 480 620 550 640 624 500 (mm) Year 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 Annual rain 400 (mm) 356 700 580 520 102 525 900 600 400
8
A watershed covering 28.16 mi2 has a system of seven rainfall gages, as shown on the map in the Figure. Using the total storm rainfall depths given in the accompanying table, determine the average rainfall over the watershed using: (a) arithmetic averaging and (b) the Thiessen polygon method. Gage ABCDEFG А с P₁ (in.) 5.13 6.74 9.00 6.01 5.56 4.98 4.55 A₁ (mi²) 1.74 6.70 1.77 13.02 0.83 2.68 1.42 28.16 B. . E 1 in. = 3.9 mi .F . G
1. Find area precipitation by isohyetal method for a certain catchment area given the following data Isohyets, cm P 6.8 S 4 PS 3 12/2 P1.5 DEPARTMENT OF CIVIL ENGINEERING CCB 433 - Fluid Mechanics for Civil Engineers Tutorial 1 August 2022 O 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 102.7 Rainfall, mm 86.3 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 - 10 0.18 20 97 213 410 602 633 100 1.65 B C D E 108.9 154.2 78.3 93.1 +00 2+15 2 20 0.21 1975 30 0.26 120 130 0.26 110 0.81 0.52 P = A₁ 6+5 2 Athal-1975 P₂ • (Pi+ P² ] + An [Po+Pr+ A₂ Atotal + (33 +97 140 0.42 2 150 0.36 5+4 70 80 0.64 1.14 160 170 0.28 0.19 + 213 413…
3. In a storm of 90 minutes duration, the incremental rainfall at various time intervals is given below. a. Maximum incremental depth (in mm) b. Maximum intensity (in mm/hr). TIME (minutes) 0 ID 20 30 40 50 60 70 80 90 CUMULATIVE (mm) C 8.5 14.5 21.7 27.9 33.0 35.1 36.2 37.0
Situation 03. Given the mass curve of a storm on a 1.95 sq.mi. reservoir is as follows: | Time(hr.) | 0 Added | 2 4 6 8 4.1 10 7.3 12 14 11.8 16 18 0.8 2.6 2.8 10.8 12.4 12.6 Rainfall (cm) a. Plot the mass curve diagram, and the rainfall hyetograph. b. If the run-off volume is 264.20 ac-ft, calculate the infiltration volume using phi-index method. c. Calculate the required outflow (cm/hr) to attain an increase in storage of 95mm at the end of the month, if the inflow is equal to the run-off volume, the precipitation is 105mm, and the evaporation is the calculated evaporation in (Situation 01) and consider infiltration computed in (b).
Answer =109 cfs
Use the Weibull and Hazen methods and log-normal graphing papers (provide below) to determine the expected annual rainfall for return periods of 2, 20, and 100 years for the data given the table below. Which plotting formula worked the best?
Given the same example and the data listed in the table, calculate the average rainfall using Theissen Method.
Sp A small urban watershed located in north of Iraq has four rainfall gauges as located in the figure below. The total rainfall recorded at each gauge during a storm event is listed. Compute the average rainfall for this storm using Thiesson method. BARCA Raingauge А D Rainfall (cm) 8.28 7.42 7.65 7.75 D 4 km 4 km C 1 km 4 km 4 km 1 km 3 km

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