2 %V9 li. 3(9 This question requires one response per rowThe base flow for this direct runoffhydrograph is:0 4 8ho Index = 0.135 cm/hRainfall excess = 5.52 cm30252015Direct runoff5.52 cm10A Base flow-6 012 18 24 30 36 42 48 54 60 66Time in hours-685.5248Discharge (m/s)3.26 cm2.26cm

The base flow is that amount of discharge of the stream that is not directly contributed by the…

Answered: The base flow for this direct runoff…

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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4. A 60 mi² drainage area has the following characteristics: longest flow path length of 10 mi, flow path length from outlet to centroid of 3.2 mi, overland slope of 0.05, curve number of 82, basin coefficient of 1.35, and storage coefficient of 0.6. a. Derive a 1-hr: i. Snyder UH ii. SCS triangular UH. b. Plot the resulting hydrographs (together on one plot) and comment on the differences in peak discharge, peak timing, hydrograph shape, and volume between the two.
2
A watershed of 37 km2 was subjected to a storm of 2-h duration from which the following information are recorded in Table Q3. a) Obtain a Unit Hydrograph for this watershed knowing that the base flow in the stream is estimated at 2 m3 /s. [10] b) Derive and plot 6-h Unit Hydrograph for the catchment area. Time (hours) 0 1 2 3 4 5 6 7 8 Discharge (m3 /s) 2 15 30 37 30 22 16 12 2
6.4. The direct runoff hydrograph resulting from a 5cm of effective rainfall of 6hr duration is given below. Determine the area of the catchment and the ordinates of the 6hr UH. Time (hr) 6 12 18 24 30 36 42 48 54 60 66 72 Direct runoff 0 25 175 320 360 310 230 165 105 60 30 10 0 (m³/s) Ans. Area of the catchment =773.28km² The ordinates of 6hr UH at 6hr intervals are (0,5,35,64,72,62,46,33,21,12,6,2,0)
Direction: A four hour unit hydrograph of a catchment is traingular in shape with base of 80 hours. The area of the catchment is 720 km². The base flow and f-index are 30 m³/s and 1 mm/h, respectively. A storm of a 4 cm occurs uniformly in 4 hours over the catchment. 6. The peak flood discharge due to the storm is
Derive and plot 3-hour Unit hydrograph for a stream which drains an area of around (401) km2. Time-discharge data of the storm is given is in Table. Assume the base flow as 2 m3 /sec. Time (Hrs.) 0 3 Flow (m³/s) 2 6 6 9 11 13 12 15 18 21 10 8 6 4 24 2
Q1. Find linear relation between Discharge (Y cumec) and Stage (x m) of for the below hydrologic data: X Y X Y X Y X Y 18 905.7 19 1004.66 1 12.86 19 1004.66 17 811.9 12 420.3 19 1004.66 88.78 12 420.3 3 40.5 8 199.9 723.26 5 88.78 17 811.9 3 40.5 639.78 4 62.06 6 120.66 7 157.7 199.9 5 88.78 13 488.3 10 299.78 1 12.86 488.3 5 88.78 12 420.3 14 561.46 811.9 12 420.3 17 811.9 14 561.46 157.7 3 40.5 3 40.5 10 299.78 88.78 811.9 6 120.66 1 12.86 1108.78 6 120.66 10 299.78 1108.78 157.7 905.7 16 723.26 561.46 12.86 3 40.5 62.06 1004.66 9 247.26 88.78 639.78 488.3 639.78 120.66 811.9 12 420.3 357.46 7 157.7 13 17 7 5 20 18 1 19 17 11 1215256 17 20 7 13 LASZO 14 4 5 16 15 8 5 17 811.9 157.7 7
C9
Given the data below: Drainage area = 405 hectares Neglect base flow TIME Hr. 0 2 4 6 8 10 12 14 16 18 Determine the following a) Direct runoff depth (Dr) b) Unit hydrograph peak flow c) Effective duration ORDINATES OF FLOOD HYDROGRAPH cu.m/s 0 0.6 1.1 2.6 5.4 4 2.6 ft. 1.7 0.3 0 cm per cm of runoff ORDINATES OF 2HR UNIT HYDROGRAPH Per cm per runoff
%VY . Q1: A catchment area is 5 square miles and the total direct Runoff (E D. R = 11150 ft / sec). Estimate the base flow for the data shown in the table below? Time 2 3 4 5. 6. 500 500 1200 2250 2920 2670 2060 1430 Total Flow(ft/sec) 202.57 | 506.43 700.32 627.97 451.44 269.13 11 U.H 10 1100 910 Time 9 12 13 14 15 16 Total 780 650 530 510 510 500 Flow(ft'/sec) U.H 173.6 118.65 81.03 52.09 28.94 11.57 2.89 Q2: Develop a 3-hr synthetic unit hydrograph for the catchment are using Snyder's method only. If the catchment area is 400 kan?, L= 25 kam and La km, assuming C15 and C,-0.7 •,.0 |||||||||||||1||||||| إلغاء إعادة تعي ين

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The base flow for this direct runoff hydrograph is: * 0 4 8h o Index = 0.135 cm/h Rainfall excess = 5.52 cm 30 25 20 15 Direct runoff 5.52 cm 10 A Base flow -6 0 6 12 18 24 30 36 42 48 54 60 66 Time in hours Discharge (m3/s) 3.26 cm 2.26cm