NS(b) The hydrograph resulting from an 8-hr storm over a catchment area of 4000 km² isgiven in the table below. Derive and plot the unit hydrograph for this storm.Time hrs Discharge (m³/s)0612182430364248546012014048019802600250015001100540450400Baseflow (m/s)120140160180210220280295360380400→ 0052N

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(b) The hydrograph resulting from an 8-hr storm over a catchment area of 4000 km² given in the table below. Derive and plot the unit hydrograph for this storm. Time hrs 0 6 12 18 24 30 36 42 48 54 60 Discharge (m/s) Baseflow (m³/s) 120 120 140 140 480 160 1980 180 2600 210 2500 220 1500 280 1100 295 540 360 450 380 400 400

(b) The hydrograph resulting from an 8-hr storm over a catchment area of 4000 km² given in the table below. Derive and plot the unit hydrograph for this storm. Time hrs 0 6 12 18 24 30 36 42 48 54 60 Discharge (m/s) Baseflow (m³/s) 120 120 140 140 480 160 1980 180 2600 210 2500 220 1500 280 1100 295 540 360 450 380 400 400

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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10-min unit hydrograph for a catchment is given in Table 1 below. Table 1: 10-min Unit Hydrograph Time (min) 05 10 15 20 25 30 35 40 45 50 1.75 1.95 2.0 1.8 1.25 0.6 Flow (m³/s) 0 0.5 1.0 1.4 0 a. What is the area of the catchment? b. Construct a storm hydrograph resulting from the 40-min rainfall event. The rainfall excess depths are provided in Table 2. Determine the peak discharge resulting from this 40-min rainfall event. Table 2: Rainfall Excess Depths Rainfall Excess (mm) Time (min) 0-20 4 20-40 6
The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and 2 cm, respectively. The index for the catchment is taken as 0.2 cm/hour. The 2 hour unit hydrograph ordinates are given in table below. Time in hrs. Discharge m 0 2 4 m³/sec 0 10 40 6 14 16 70 50 20 10 6 0 Base flow can be taken as 7 m³/sec at the beginning of the storm linearly increasing to 9 m³/sec at 10 Hrs. after the beginning and then linearly decreasing to 8 m³/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood hydrograph. 8 10 12
The hydrograph resulting from an 8-hr storm over a catchment area of 4000 km² is given in the table below. Derive and plot the unit hydrograph for this storm. Time hrs Discharge (m³/s) Base flow (m³/s) 0 120 140 160 180 210 220 280 295 360 380 400 36 60 18 24 30 42 48 54 6 12 120 140 480 1980 2600 2500 1500 1100 540 450 400
Question 3 A watershed of 35 km? was subjected to a storm of 1h duration from which the following information are recorded in Table 2. a) Obtain a Unit Hydrograph for this watershed knowing that the base flow in the stream is estimated at 2 m°/s. b) Derive and plot 4 hours Unit Hydrograph for the catchment area. Table 2: Data for the time and Discharge Time (hours) 01 2 3 4 5 6 7 Discharge (m³/s) | 2 15 30 37 30 22 16 12 2
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 3 A unit hydrograph for a watershed is triangular in shape with base period of 20 hours. The area of the watershed is 500 ha. What is the peak discharge in m³/hours?
The observed rainfall and discharge of a catchment is given the table. The catchment area is 0.23Km^2. Time (h) 1 2 3 4 5 6 7 8 00 9 10 11 12 13 Rainfall (mm) 0 0 2 6 10 8 2 0 0 0 0 0 0 1. Estimate the base flow. 2. Estimate the surface runoff. 3. Estimate the initial loss 4. Estimate the continuous loss using phi method. Discharge (M3/s) 20 20 20 20 30 50 40 35 25 21 20 20 20
The ordinates of flood hydrograph resulting from a storm of 5 hr duration are given below: Time (hr) 0 10 20 30 40 50 60 70 Q(m°/s) 5 15 35 55 35 25 15 The excess rainfall at the outlet of a 200 km2 catchment is cm. (Answer upto 2 places of decimal). Assume base flow as 5 m3/s.
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
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.
PLOBLEM #1 Derive by deconvolution the six-hour unit hydrograph from the following data for a watershed having a drainage area of 216 km2, assuming a constant rainfall abstraction rate and a constant baseflow of 20 m/s. Six-hour period 2 3 4 5 7 8 9 10 11 Rainfall (cm) 1.5 3.5 2.5 1.5 Streamflow (m'%s) 26 71 174 226 173 99 49 33 26 22 21
having a volume of one-inch. Example 6.1 From the data given in Table 6.1 below, derive a 6-hour unit hydrograph if this data is obtained from a six-hour duration storm and the catchment area is 3,200 square kilometers. Table 6.1: Data for Unit Hydrograph Time Discharge Base Flow (m/s) (4) 21 21 Date (day) (2) (m/s) (3) 21 (1) 11-Jan 12-Jan 13-Jan 14-Jan 15-Jan st 2nd 3rd 4th 5th 6th 7th 8h 9th 10th 21 21 20 21 20 20 20 20 16-Jan 17-Jan 18-Jan 19-Jan 20-Jan 20 20 20 20 20 521 11 160 21 th 21-Jan 82 29 12th 13th 14th 15th 16th 17th 22-Jan 23-Jan 63 35 59 47 24-Jan 53 53 25-Jan 47 47 26-Jan 27-Jan 45 38 45 38