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 are 120, 100, 80, 110, and 140 cm respectively. During a particular storm the precipitatio recorded by stations P, Q, R, and S are 15, 10, 7, and 11 respectively, the instrument a station T was inoperative during the storm. Estimate the rainfall at station T during the storm.

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 are 120, 100, 80, 110, and 140 cm respectively. During a particular storm the precipitatio recorded by stations P, Q, R, and S are 15, 10, 7, and 11 respectively, the instrument a station T was inoperative during the storm. Estimate the rainfall at station T during the storm.

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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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
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Use the Clark unit hydrograph procedure to compute and plot the 3-hr unit hydrograph for a watershed that has an area of 1,100 km^2 and a time of concentration of 5 hr. The Clark storage coefficient is estimated to be 4 hr. Use a 1-hr time interval for the computations and apply the U.S. Army Corps of Engineers synthetic time-area relationship. Extend the unit hydrograph to t = 25 hr to capture the recession limb.
2-A 3 hours storm produces a flood hydrograph as: t (hr) Q (m³/s) 0 3 4 9 6 12 9 18 12 15 18 21 24 27 20 16 20 10 8 6 Determine 3 hr-UH, if the catchment area is 50 km². 3- Find the flood hydrograph of 3 hrs storm (use the UH of Q2). Total precipitation is 14.5 cm and 9-index is 1cm/hr. 30 4
Hydrology: i need the answer quickly i need all the steps, i need the answer in Handwritten.
Conduct a single-station flood-frequency analysis on annual flood peaks of a small stream as given below has acoefficient of skewness equal to zero. Do all necessary steps for conducting such an analysis including the use of theWeibull plotting positions. Based on the single-station flood-frequency analysis plot, determine the return period of100 cfs flood peak. Also, obtain the flood peaks for return periods of 10-year and 5-year. Year 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993Annual Flood Peak (cfs) 300 60 80 100 40 800 400 30 700 80
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6- Maximum annual rainfall depth data are fitted with a distribution that is positively skewed (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
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QI. (a) Describe the Rational' method of designing surface water drainage systems. Define fully any terms used in the description. Discuss the assumptions made in applying the rational method, and comment upon the procedure used to predict the peak flow for a given return period. (b) At the beginning of the month of June, water level of a reservoir with surface area of 7km? was at 20m (Refer to reservoir characteristic curve in Figure Qla). Average longterm monthly rainfall for the month of June recorded at five raingages is summarized in Table Q1 (assuming the same average amount of rainfall is also recorded in the reservoir). The inflow to the reservoir X, located at the downstream catchment outfall, resulted from that rainfall can be estimated as Qin = 0.65PA where P is mean areal rainfall (to be estimated by Thiessen Polygon) from a 36km? catchment area A, schematically shown in Figure lb. An average monthly withdrawal of 6MCM from the reservoir is required for water supply…
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.