The ordinates of a 6-h unit hydrograph are as given below: Time (h) 18 24 30 36 42 48 6 12 54 60 25 50 75 100 87.5 75 62.5 50 37.5 25 99 66 72 78 12.5 0 0 6-h UH ordinates (m3/s) Calculate the resulting hydrograph (flood hydrograph) due to storm of rainfall excess of 2 cm during the first 6 hours and 4 cm during the second 6 hours interval. The base flow can be assumed to be 25 m³/s constant throughout.

The ordinates of a 6-h unit hydrograph are as given below: Time (h) 18 24 30 36 42 48 6 12 54 60 25 50 75 100 87.5 75 62.5 50 37.5 25 99 66 72 78 12.5 0 0 6-h UH ordinates (m3/s) Calculate the resulting hydrograph (flood hydrograph) due to storm of rainfall excess of 2 cm during the first 6 hours and 4 cm during the second 6 hours interval. The base flow can be assumed to be 25 m³/s constant throughout.

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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Q4) The ordinates of a 6-h unit hydrograph are given. Time (h) 0 3 6 9 12 18 24 30 36 42 48 54 60 66 6-h UH ordi- nate (m/s) 0 150 250 450 600 800 700 600 450 320 200 100 500 A stom had three successive 6-h intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Assuming a øindex of 0.20 cm/h and a base flow of 30 m/s, determine and plot the resulting hydrograph of flow.
Example -2 Using the given 6-h unit hydrograph derive the flood hydrograph due to the storm given below, UH: Time (h) 6-h UH ordinates (m³/s) 0 20 60 150 120 90 66 Storm: 0 6 12 18 24 30 36 42 48 54 60 66 Time from beginning of the storm (h) 0 Accumulated rainfall (cm) 0 50 32 20 10 0 6 12 18 4 5 10 The index for the storm can be assumed to be 0.167 cm/h. Assume the base flow to be 20 m³/s constant throughout.
Q1) During a storm , the hourly rainfall data was as follows: 0 1 2 3 4 5 6 7 8 9 Time (hrs) Rainfall (mm/hr) | 0 | 20 | 25 45 30 10 10 | 15 10 0 1) plot the hyetograph 2) calculate and plot Mass Curve Ordinate.
Three inches of runoff produced the hydrograph below. Find the unit hydrograph. What value goes in the highlighted cell? 24-hr Storm Runoff 24-hr Unit Time Hydrograph Hydrograph (hr) (cfs) |(cfs) 150 300 12 1050 16 1260 20 1500 24 1800 28 2010 32 2700 36 3360 40 5100 44 3900 48 3138 52 1956 56 1650 60 1200 64 1188 68 450 72 270 76 O 250 cfs O 150 cfs O 100 cfs O O cfs O 450 cfs O 200 cfs O 50 cfs
Q4-The stream flows due to three successive storms of 2.9, 4.9 and 3.9 cm of 6 hours duration each on a basin are given below. The area of the basin is 118.8 km². Derive a 6-hour unit hydrograph for the basin. An average storm loss of 0.15 cm/hr can be assumed. Time (hr) 0 Flow (cumec) 20 3 50 6 92 9 140 12 199 15 202 18 204 21 24 84.5 27 30 33 45.5 29 20
KOREK LTE SIKOREK 30.|| E E O A O M O N 75% D 8:32 E Ch 8 tutorial 1.. Engineering Hydrology CH 8 / Unit Hydrograph Q) The ordinates of a 3-hour UH are given in the following table: 0 3 6 Time (Hours) 3-hour UH (m/s) 9 12 15 18 21 24 27 30 10 30 80 60 50 40 30 10 2 (a) Estimate the area of the basin, (b) Determine the DRH ordinates due to two ER of 2 cm and 3 cm occurring in two successive 3-hour durations each. (c) Estimate the flood hydrograph ordinates if the base flow at time 0 h is 10 m/s and increase to reach 20 m/s at time of 30h. (d) Estimate the total runoff volume
6.12 The ordinates of a 6-h unit hydrograph are given. Time (h) 6-h UH ordi- nate (m/s) 3 9 12 18 24 30 36 42 48 54 60 66 0 150 250 450 600 800 700 600 450 320 200 100 50 The McGraw Hill Companies Hydrographs 239 A storm had three successive 6-h intervals of rainfall magnitude of 3.0, 5.0 and 4.0 cm, respectively. Assuming a ø index of 0.20 cm/h and a base flow of 30 m/s, determine and plot the resulting hydrograph of flow.
7-Find the half-hour unit hydrograph using the excess rainfall hyetograph and direct runoff hydrograph given below Time (1/2 h) Excess rainfall (in) Direct runoff (cfs) 1 1.06 428 2 1.93 1923 1.81 5297 9131 10625 7834 3921 1846 1402 830 313 Ans: 3 4 5 6 7 8 9 10 11 n Un (cfs/in) 1 404 2 3 1079 2343 5 6 7 4 2506 1460 453 381 8 274 9 173
The hydrograph tabulated below was observed for a river draining a 40 square miles catchment, following a storm lasting 3 hours. Нour Нour fr3/s Нour fi3/s 450 5500 9000 7500 6500 24 27 3500 3000 2600 2210 48 1070 950 840 750 3 51 54 57 30 33 36 39 42 12 1890 60 15 18 21 5600 4800 660 590 540 1620 63 1400 1220 66 4100 45 Separate base-flow from runoff and calculate total runoff and calculate total runoff volume. What was the net rainfall in inches per hour?
Table Q4 shows the details of the storm hydrograph with the corresponding direct discharge. The given time interval is 3 hours between the readings. Q4 Table Q4 Excess rainfall (mm) 11 Time (hr) Direct discharge (m³/s) 3 70 28 230 9. 30 600 12 1400 15 2380 18 3300 21 4880 24 6320 27 3305 30 350 33 300 36 100 By using the convolution method, determine the unit hydrograph ordinates. (a) (b) Illustrate the unit hydrograph.
'The table below gives the ordinates of a stream, flow hydrograph at the outlet of a catchment of an area 600 km2 due to a storm that is believed to have duration of 3 hours. Assuming a constant base flow of 50 m³ /s, compute the ordinates of a 3-hour UH for the catchment. Time (hr) 0 3 6 9 12 | 21 | 27 30 150 15 18 24 33 36 Flow 50 600 950 700 530 400 310 240 190 110 80 50 (m/s)
Q1) During a storm , the hourly rainfall data observed was as follows: Time (hrs) Rainfall (mm) 0 1 2 3 4 5 6 78 9 0 25 20 45 30 10 0 15 10 0 Calculate and plot the following: 1) Hyetograph 2) Mass Curve.