Q1. Based on 14 days runoff data given in TABLE Q1, determine the unit hydrograph for the catchment if the area is 4500 km2. Separate the baseflow by using appropriate method. TABLE Q1 Runoff Hydrograph Tme (das) R's) | s) Runoff (m Time (days) Runof (m') II 2 10 II 12 2 15 2 18 13 16 14

Q1. Based on 14 days runoff data given in TABLE Q1, determine the unit hydrograph for the catchment if the area is 4500 km2. Separate the baseflow by using appropriate method. TABLE Q1 Runoff Hydrograph Tme (das) R's) | s) Runoff (m Time (days) Runof (m') II 2 10 II 12 2 15 2 18 13 16 14

Structural Analysis

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ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Q1.
Based on 14 days runoff data
given in TABLE Q1, determine the unit
hydrograph for the catchment if the
area is 4500 km2. Separate the
baseflow by using appropriate method.
TABLE Q1 Runoff Hydrograph
Time (days) Runof(m's
Time (days) Runoff(m's
1
II
2
10
4
4
2
15
12
2
6
18
13
7
16
14

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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.
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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
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2 %V9 li. 3 (9 This question requires one response per row 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 12 18 24 30 36 42 48 54 60 66 Time in hours -6 8 5.52 48 Discharge (m/s) 3.26 cm 2.26cm