Answer fast Using the measured rainfall data for R=10 years below,Storm duration (min.)510153060 120Intensity (in/hr.)7.1 5.9 5.13.82.3 1.4Determine the 10-year IDF curve equation based on the following empirical model. UsingExcel, plot the actual data points and the empirical model. Provide comments on the modelperformance.i =a(ta + b)¹where i and ta represent the average intensity [in/hr.] and storm duration [min.]

Answered: Image /qna-images/answer/608d05af-f63c-4482-b41a-debdd1f95bf2.jpg

Answered: Using the measured rainfall data for R…

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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find the following : 1- Average precipitation by Athematic mean method (mm)= ? 2- Average precipitation by Thiessen method (mm)= ?
Figure 2.2 shows a catchment with seven rain guage stations inside it and three stations outside. The rainfall recorded by each of these stations are indicated by the figure. Draw the figure to an enlarged scale and calculate the mean precipitation method by Thiessen-mean method.
1. Annual maximum recorded floods in a river for the period of 1951 to 1977 is given below. Verify whether Gumbel extreme value distribution fit the recorded values. Estimate the flood discharge with recurrence interval of (i) 100 years and (ii) 150 years by graphical extrapolation. Year 1951 1952 1953 1954 1955 1956 1957 1958 1959 Маx 2947 3521 2399 4124 3496 2947 5060 4903 3757 Flood (m³/s) Year 1960 1961 1962 1963 1964 1965 1966 1967 1968 Мах 4798 4290 4652 5050 6900 4366 3380 7826 3320 Flood (m3/s) Year 1969 1970 1971 1972 1973 1974 1975 1976 1977 Маx 6599 3700 4175 2988 2709 3873 4593 6761 1971 Flood (m³/s)
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?
3. It is known for a region that observed relationship among observed intensity, duration and return periods can be defined by the expressionI=aT/ t° where I intensity, T return period, t is duration of the rainfall considered. a, b and c are model parameters. Using the observation in Table 3 Table 3: Rainfall intensities (mm/h) Duration/Return periods T=15 vears 35 30 T= 5 vears T= 10 vears 4 hr 6 hr 8 hr 25 30 25 20 15 19 25 a) Calculate local parameters, a, b and c, analytically
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
The following table gives the observed annual flood values in the river Krishna at Karad. Estimate the flood peaks with return periods of 50, 100 and 1000 years by using: (a) Gumbel’s extreme value distribution (b) Weibull (c) Chegodayev (see table in image)
A catchment with an area A = 85 km^2, has four rainfall gauges (P1 – P4) according to the figure. Use the rainfall data in the table to determine the areal rainfall over the catchment. a.Use the arithmetic averaging method to calculate areal rainfall. b.Use the Thiessen method to calculate areal rainfall.
9.The observed annual rainfall (P) and the corresponding runoff (R) for a small catchment are: Develop a rainfall-runoff regression equation and find the coefficient of correlation.What is the runoff expected for an annual rainfall of 80 cm? Prep (mm) 90 110 40 130 146 100 Runoff (mm) 30 50 6 62 75 40
Figure 2.2 shows a catchment with seven rain guage stations inside it and three stations outside. The rainfall recorded by each of these stations are indicated by the figure. Draw the figure to an enlarged scale and calculate the mean precipitation method by (a) Isohyetal method and by (b) Arithmetic-mean method.
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C10 1

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