4.1. The storm hydrograph given bellow was measured at a point in a river at 2-hrintervals from an isolated storm of 2-hr duration for a stream with a drainage areaof 320 km²Time/hr024681014182226 30Discharge 2018902501801501004030150m^3/s(a) Calculate the volume of direct runoff(b) Calculate the depth of effective rainfall(c) derive the 8-h unit hydrograph for the same catchment:[Hint: Use constant base flow of 18 m*/s]4.2. The 10 highest annual precipitation values from 79 years recorded data providedbelow.Precipitation 430 450 650 33030 220 530 50500400 $50 560(mm)Calculate:a) Return period and probability of occurrence within the return periodb) Probability of non-exceedance during design period of 50 yearsc) Annual precipitation corresponding to 25 and 50 years return periods

Step 1:4.1 (a) Calculate the volume of direct runoff:The direct runoff can be calculated by finding…

Answered: 4.1. The storm hydrograph given bellow…

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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The ordinates of a six-hour unit hydrograph for a catchment area of 1000 km are given below. Time (hr.) UH Ordinates (m'/s-em) 12 200 18 30 36 15 6 24 42 80 146 80 50 The storm lasted for 18 hours. The effective rainfall increments (rainfall excess) for six-hour periods are 0.6 cm. 2 cm, and 1 cm respectively. Compute the runoff hydrograph. Also find out the peak flow and the volume of runoff.
A small watershed has four rainfall gages located in the figure below. Total rainfallrecorded at each gage during a storm event is listed in the table. Compute the mean areal rainfallfor this storm using (a) arithmetic averaging and (b) the Thiessen method.
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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
Following catchment area includes 20-years of annual rainfall data. If the catchment average rainfall is to be calculated in each year using the Thiessen Polygon method or the Isohyetal method, explain the method you select and reasons. Consider that the both are area-average methods and give reasonably similar answers when the rain gauge network is dense as shown in the figure.
The ordinates of a hydrograph of surface runoff resulting from 4.5cm of rainfall excess of duration 8 hours in a catchment are as follows. Determine the ordinates of the 8h unit hydrograph for this catchment. Tabulate your solution and plot the 8H-UH.
The rainfall excess derived from the weighted-average daily rainfall in a basin are indicated below. The 24-hr unit hydrograph from the observed data in the basin is also given. Estimate the daily streamflow. A constant baseflow of 20 m³/s has been estimated. Date, July 2006 6 14 18 Rainfall excess (mm) 28 5.2 48.5 Unit Hydrograph: Time (days) 0 2 3 4 5 6 Flow (m³/s) 0 1.5 11.6 7.7 5.0 2.3 0
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A small urban watershed has four rain gauges as located in the figure. Total rainfall recorded at each during a storm event is listed. Compute the mean aerial rainfall for this storm using T.P.M
Question 3: Use both of Arithmetic Mean and Thiessen Polygon Methods to calculate the areal rainfall intensity for the watershed given below in (cm) (Inside the black box only) 4 6.0 1 Station No. Intensity (cm.) 2 4 3 5 1 5.0 2 3.0 3 4.0 5 7.0
Problem 2 The six-hour unit hydrograph of a watershed having a drainage area equal to 393 km? is as follows: Time (h) 0 6 12 18 24 30 36 42 Unit hydrograph (m'/s cm) 0 1.8 30.9 85.6 41.8 14.6 5.5 1.8 For a storm over the watershed having excess rainfall of 5 cm for the first six hours and 15 cm for the second six hours, compute the streamflow hydrograph, assuming constant baseflow of 100 m/s.

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