Given below in table Q4 are the ordinates of a 6-hr unit hydrograph for a catchment. Table Q4 Time (hr) 06 12 18 24 30 36 42 48 60 66 U.H 5.0 12.5 18.5 16.0 11.0 6.0 3.6 2.5 1.6 0.8 ordinate (m/sec) (i) Calculate the ordinates of the direct runoff hydrograph due to a rainfall excess of six (-hr consecutive storms); 3.5, 2.5, 1.5 cm. (ii) Estimate the peak discharge for this event.

Given below in table Q4 are the ordinates of a 6-hr unit hydrograph for a catchment. Table Q4 Time (hr) 06 12 18 24 30 36 42 48 60 66 U.H 5.0 12.5 18.5 16.0 11.0 6.0 3.6 2.5 1.6 0.8 ordinate (m/sec) (i) Calculate the ordinates of the direct runoff hydrograph due to a rainfall excess of six (-hr consecutive storms); 3.5, 2.5, 1.5 cm. (ii) Estimate the peak discharge for this event.

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.
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Ron vel. CP= Precip Vol Department of Civil Engineering Engineering Hydrology - CCB 433 Tutorial No.2 October 2022 In a given year, a catchment with an area of 2500 km² received 1.3 m of precipitation. The average rate of flow measured in a river draining the catchment was 30 m³s¹. 24xboxbox 3012х12х30=2 ³)? > (ii) What is the runoff coefficient? (iii) How much water is lost due to the combined effects of evaporation, transpiration, and 11x2500 × 106 = infiltration? (Expressed in m). P-R- [1₂ +ET] =AS
Determine the unit hydrograph for a stream basin of area 2 km2 from the given data of a 5 hr storm and average base flow of 35 m3/s.
H.W a a -A 3 hours storm produces a flood hydrograph as: t (hr) Q (m'/s) |0 3 6 4 9 12 |9 12 15 18 21 24 27 6. 30 18 20 16 20 10 8. 4 Determine 3 hr-UH , if the catchment area is 50 km? . b-Find the flood hydrograph of 3 hrs storm (use the UH of a ). Total precipitation is 14.5 cm and -index is 1cm/hr. C- Find the total hydrograph of 2 hrs and 5 hrs successive storms of 1.5 and 2.4 cm excess rainfall. Base flow is 5 m/s and use 3 hrs U.H. of a.
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Example 3. The ordinates o fa 6-hour unit hydrograph o fa catchment is given below. Time (h) Ordinate 3 9. 12 15 18 24 30 36 42 48 of 6-h UH 25 50 85 125 160 185 160 110 60 36 25 Time (h) 54 60 69 Ordinate of 6-h UH 16 8 0 Derive the flood hydrograph in the catchment due to the storm given below: Time from start of storm (h) Accumulated rainfall (cm) 12 18 3.5 11.0 16.5 The storm loss rate (O index) for the catchment is estimated as 0.25 cm/h. The base flow can be assumed to be 15 m³/s at the beginning and increasing by 2.0 m³/s for every 12 hours till the end of the direct-runoff hydrograph.
10:19 4 Quiz Hydro_1756661bfb3.. Given below are the stream flows from a catchment area of 10 000 m?due to a storm with 3.44 cm precipitation Time (hr) Flow(m /sec) 15 0 1 2 3 4 5 6 25 50 55 7 8 9 10 24 20 15 48 35 30 27 Separate the base flow from direct runoff flow by using the Straight line method.
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