9.24 The rainfall excesses derived from the weighted-average daily rainfall in a basin are indi- cated below. The 24-hour 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 28 5.2 48.5 Rainfall excess (mm) Unit Hydrograph: Time (days) 0 1 2 3 4 5 6 Flow (m³/s) 0 1.5 11.6 7.7 5.0 2.3 0

9.24 The rainfall excesses derived from the weighted-average daily rainfall in a basin are indi- cated below. The 24-hour 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 28 5.2 48.5 Rainfall excess (mm) Unit Hydrograph: Time (days) 0 1 2 3 4 5 6 Flow (m³/s) 0 1.5 11.6 7.7 5.0 2.3 0

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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Question 7 The total rainfall hyetograph of a storm, which took place over a basin is given below. Ordinates of Total Storm Hydrograph (TSH) obtained for the basin is given in the table below. The baseflow is constant and is 4 m³/s. If the depth of excess rainfall is 8 cm, determine: i (mm/hr) a) depth of direct runoff, b) depth of infiltrated water, c) -index, d) equation of surface runoff hydrograph in terms of UH₂ and lag times. e) UH2 ordinates of this basin, f) area of the basin. t TSH (hr) (m³/s) 0 4 24.68 뜨뜨뜨뜨뜨뜨 10 36 40 12 39 16 8 14 31 20 16 22 26 22 18 13 24 8 COL 4 5 20 Els 15 10 5 028 12 16 t (hr)
QUESTION 3 10 A storm with 10 cm precipitation produced a direct surface runoff of 5.8 cm in the equivalent depth unit. The time distribution of the storm is given in Table below. Estimate the @-index of the storm and the excess rainfall hyetograph. Time from start (hr) Incremental 0.4 rainfall in each hr (cm) 4 6. 0.9 1.5. 3.3 T.7 1.6 1.0 0.5
Q5: given the following 1 hr. unit hydrograph for two storms. duration each having a rainfall excess of 6 and 4 cm occurring successively. Assume a constant base flow of 100m³/s and =2 cm/hr. determine the resulting flow hydrograph. Time 0 1 2 3 4 5 6 7 8 hr. 100 300 1000 1500 2100 1900 1425 500 Flow m³/s 100
1-In a storm, the excess rainfall of 0.5, 0.7,0 and 0.8 cm occurred in four successive hours. If the base flow is 0.5 m³/s, find the 1-hr unit hydrograph where the storm hydrograph is given below (Q in m³/s and t in hr): t 0 Q 0.5 1 2 3 4 5 44.5 110.5 85.5 102.8 94 6 38.4 7 18.6 8 9 10.9 5.3 10 11 0.5 2.9
Question1: (a) Given a rainfall duration of 1-hour and an effective precipitation of 1.5 cm and the hydrograph in the table below, determine the 1-hour unit hydrograph. Time (hrs) 0 1 2 3 4 5 6 7 8 9 10 Flow (m³/s) 100 100 220 512 585 460 330 210 150 105 100 (b) Use the Unit Hydrograph from the part (a) to determine the hydrograph resulting from the following rain event. Time (hrs) Excess Rainfall (cm) 0.3 1.4 0.9 1 2 3
3. For a 2 hour, 8 mm/h intensity rainfall, the hydrograph given in Table is observed. The area of watershed is 500 km² Table: Propeller readings Time 0 flow rate (m³/s) 8 2 4 6 14 18 30 8 10 12 45 38 28 14 16 18 20 22 24. 18. 14 10 a) Obtain 2 hour unit - hydrograph for the considered flow section b) Obtain 4 hour unit- hydrograph for considered flow section. c) Obtain the hydrograph of a rainfall with 4 hour duration and 10 mm/h intensity. 24 8 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.
Q3: A river catehment has a 2.0 hour unit hydrograph with the ordinates 0,3,11,35,55,66,63,40,22,9 and 2 m'/sec. Assume that the base flow at time t=0 hour is 50 m/sec and linearly increases to 74 m'/sec at t=24 hour. Compute the hydrograph resulting from two successive 2.0 hour periods of effective rainfall of 2.0 cm and 3.0 cm respectively.
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
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
QUESTION For a 2-hour, 10 mm/h intensity rainfall, the hydrograph given in Table is observed. The area of watershed is 400 km². Table; Propeller Readings Time 0 2 4 6 8 10 12 Flow Rate (m³/s) 16 22 26 38 53 46 36 14 16 18 32 36 22 a) Obtain 2-hour unit - hydrograph for the considered flow section. 20 22 24 18 16 16
R The following table show the precipitation in (mm/hr.) observed at the rain gages (A, B, and C) which shown in figure belo 1. Find the average precipitation each hr. over the catchment by Thiessen method . 2. Draw a graphical relation between the average precipitation each hr. and the time. - 3. Find the (& and W- index), if the runoff volume=104.4 cm.km® thr.) 1 2 3 a 5 Rain gage A 5 | [45 [ | & 8 3 7 [35 = [ 2 % a 9 |20 | 12 | & ain gage c i 10km rain gage - ain gge 106m