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

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

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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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
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
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
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4. A 4-hr storm rains on a 100 km² drainage watershed. The surface runoff data from a gaging station draining the watershed are given below: Time (hr) 0 2 4 6 8 10 12 14 16 18 20 22 Direct Runoff, Q (m³/s) 0 0 200 600 900 700 500 300 200 100 0 0 (a) Construct the unit hydrograph for the 4-hour storm. (b) Find the runoff rate at t = 10 hr from a three-storm system: The first storm has an average depth of 6 cm starting at t = 0 hr. The second storm has an average depth of 14 cm starting at t = 4 hr. The third storm has an average depth of 8 cm starting at t = 6 hr.
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