7- If you want to design for a 10% risk of failure, for a design life of 20 years, then youshould use a return period of: (5p)(A) 150 years(B) 175 years(C) 190 years(D) 200 years 6- Maximum annual rainfall depth data are fitted with a distribution that is positivelyskewed (i.e., it has a longer tail to the right). If the mean value for the distribution is 4.22 in,then the rainfall depth with return period 2 years will be (use the next page table): (5 p)(A) Strictly less than 4.22 in(B) Equal to 4.22 in(C) Strictly larger than 4.22 in(D) None of the above

6) The right option is(A) Strictly less than 4.22 in. 7) The right option isC) 190…

Answered: 7- If you want to design for a 10% risk…

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 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
Compute the Rainfall Depth and the Rainfall Intensity of the given data. Show all your solution. 田 YEAR MONTH DAY RAINFALL RAINFALL RAINFALL DEPTH INTENSITY 2013 1 2013 2. 8.2 2014 1. 2014 2. -1 2015 1. 1 1.6 2015 0. 2016 1 1 -D1 2016 1 0. 2017 0. 2017 2.3 2018 1 1.3 2018 -1 2019 1 2019 2020 -1 2020 1 10.5 2. 2. 2. 21 1. 1. 1. 1. 1, 1. 1. 1. 1.
In a catchment area, six rainfall stations are situated as shown in the figure below. Rainfall depths (cm) in year 2016 were as follows: A=22, B=35, C=30, D=29, and E=26, P= 21. Determine the average annual precipitation using the Thiessen—polygons method.
A meteorological station has recorded rainfall depth for the past 59 years. An annual maximum series for precipitation depth of all 10-hour storms has been reconstructed. Following the Weibull formula, what is the estimated return period for the third highest precipitation depth of the series? A. 60 year B. 30 year C. 20 year D. 10 year
A meteorological station has recorded rainfall depth for the past 49 years. An annual maximum series for precipitation depth of all 10-hour storms has been reconstructed. Following the Weibull formula, what is the estimated return period for the fifth highest precipitation depth of the series? A. 48 year B. 47 year C. 25 year D. 10 year
In the table below annual rainfalls of gage A, B, C and D are given. Gage D was permanently relocated after a period of 5 yr (at the end of 1989); thus adjust the recorded values from 1985 through 1989 of gage D using double mass curve assume the data for the other gages are consistent.
In a catchment area, six rainfall stations are situated as shown in the figure below. Rainfall depths (cm) in year 2016 were as follows: A=22, B=35, C=30, D:29, and E=26, F= 21. Determine the average annual precipitation using the Thiessen-polygons method. 50 km 25 km 20 km + 20 km 50 km 26 km
The annual rainfall at station X and the average annual rainfall at 18 surrounding stations are given in table below. Check the consistency of the record at station X Determine the year in which a change in regime has occurred State how you are going to adjust the records for the change in regime Determine the average annual rainfall for the period from 1952-1970 for the changed regime. Year 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 Station X 30.5 38.9 43.7 32.2 27.4 32 49.3 28.4 24.6 21.8 28.2 17.3 22.3 28.4 24.1 26.9 20.6 29.5 28.4 18-stations Ave 22.8 35.0 30.2 27.4 25.2 28.2 36.1 18.4 25.1 23.6 33.3 23.4 36.0 31.2 23.1 23.4 23.1 33.2 26.4
Return Period 1. Year Maximum depth of precipitation of certain area is presented below. Based on the given data, compute the following: Year a. b. c. d. Using additional information from year 2016 to 2020, what would be the return period of 1995, 2005, 2010 and 2015. Maximum depth of precipitation in year 2016, 2017, 2018, 2019 and 2020 are 180mm, 190mm, 200mm, 210mm and 230mm respectively. e. Using the data from (d), from what year has the least probability of occurrence of that precipitation, explain. Max. Rainfall depth (mm) Max. Rainfall depth (mm) Return Period for the year 1995, 2005, 2010 and 2015 Year Max. Rainfall depth (mm) What is the probability of occurrence of the maximum depth recorded from 1995 to 2015. Interpret the return period of year 2002, please elaborate. 1995 155 2002 215 1996 197 151 2003 138 2009 2010 190 1997 1998 189 2004 145 2011 147 157 2005 124 2012 175 1999 136 2006 194 2013 161 2000 280 2007 164 2014 193 2001 186 2008 160 2015 192
a) Draw Thiessen polygons on the catchment shown below. If the rainfall depths recorded by Gauge A, B, and C are 19mm, 8mm, and 9mm and the corresponding polygon areas are 5.1 km2, 3.2km2, and 5.3 km2, estimate the catchment average rainfall depth and the total volume of water from this rainfall event. b) Based on the data, sketch 5mm, 10mm, 15mm,20mm isohyets apporixmately. B
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.
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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