The ordinates of a six-hour unit hydrograph for a catchment area of 1000 km are given below Time (hr.) UH Ordinates (m'/is-cm) 6 12 18 24 30 36 42 80 200 146 80 50 I5 The storm lasted for 18 hours. The effective rainfall increments (rainfall excess) for six-hou periods are 0.6 em, 2 em, and I em respectively. Compute the runoff hydrograph. Also fine out the peak flow and the volume of runoff.

The ordinates of a six-hour unit hydrograph for a catchment area of 1000 km are given below Time (hr.) UH Ordinates (m'/is-cm) 6 12 18 24 30 36 42 80 200 146 80 50 I5 The storm lasted for 18 hours. The effective rainfall increments (rainfall excess) for six-hou periods are 0.6 em, 2 em, and I em respectively. Compute the runoff hydrograph. Also fine out the peak flow and the volume of runoff.

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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Analysis of rainfall and runoff records for a certain storm over a basin (of area 3210 km²) gave the following data: Rainfall for successive 2 hr periods: 2.5, 6.5 and 4.5 cm/hr. Direct surface discharge at the concentration point for successive 2-hr periods: 400, 1200, 4500, 7700, 12000, 10220, 8260, 3900, 838 and 400 m’. Derive the unit hydrograph for the catchment area.
Net Storm Rainfall Example 2-1 Rain falls as shown in the rainfall hyetograph (intensity Vs. time) in Fig. E2-1 (a). The o index for the Storm is 0.5 in./hr and is constant over 5 hr. Plot the net rainfall on the hydrograph (flow vs. time) given in Fig. E2-1 (a). Determine the total volume of runoff and the watershed area. 1cfs = 1.008 ac-in/hr 2.0 1.5 1.0 0.5 1 3. 4 Time (hr) 700 600 500 400 300 200 100 4 8 12 16 20 24 Time (hr) Time (hr) Q (cfs) Volume (cfs-hr) 0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 16-18 18-20 20-22 22-24 24-26 16 Q (cfs) iT (in./hr)
A catchment has a runoff coefficient of 0.20, area = 1.5 km² with a general slope of 0.001 and maximum length of travel of overland flow of 1.25 km. Information on the storm of 50 years return period is given as follows: Duration (min) 15 30 45 60 80 Rainfall (mm) 40 60 75 100 120 Estimate the peak flow to be drained by a culvert for a 50 year storm
The incremental rainfall intensity data given in the table below were recorded at a gage located on a small urban watershed. Using a 0.5-hour time step: (a) Plot the rainfall Hyetograph. (b) Determine the total rainfall depth during the storm event. (c) If the runoff depth is 4.65 mm, find the phi- index in mm/ hr. Rainfall intensity data- Time (hr) 0- 0.5- 1.0- 1.5- 2.0- 2.5- 3.0- 3.5- 4.0- 4.5- 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Rainfall Intensity 2 2.5 5 1.5 1 0.5 (mm/hr)
A stormwith 10 cm of precipitation produceda directrunoff of 6.02 cm. The duration of the rainfall was 16 hours and its time distribution is given below. Estimate the 0-index of the storm. Time from start (h) Cumulative rainfall (cm) 0 2 4 8 10 12 14 16 0.4 1.3 2.8 5.1 5.9 9.25 9.5 10.0 A) 0.261 B) 0.249 C) 0.257 D) 0.283 E) None of the above
The ordinates of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5 cm for the first six hours and 15 cm for the second six hours, compute the direct runoff hydrograph ordinates and plot the hydrograph. Compute the depth of direct runoff in cm. Assuming constant baseflow of 100 m^3/s, compute the storm hydrograph ordinates and plot the hydrograph. (List all the DRH ordinates in order, separated by a single space.)
An effective rainfall of 2 hour duration produced a flood hydrograph peak of 200 m³/s. The flood hygrograph has a base flow of 20 m³/s. If the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour, the peak of 2-hour unit hygrograph (in m³/s-cm up to one decimal place) is
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
A storm produced rainfall depths of 3.5, 7.5, 5.5 cm on the drainage basin of area 104 km² in the three successive time period of 6 hr each. Assuming a base flow of 15 m³/s and -index of 0.25 cm/hr. Compute total run off hydrograph resulting from this storm? Time(hr) 0369 12 15 18 21 24 UH (m/s) 0 25 50 85 125 160 185 172.5 160 27 30 36 42 48 54 135 110 60 36 25 16
1. The 1-hr unit hydrograph for a watershed is given below. Determine the runoff for the third time interval from this watershed for the storm pattern given. The abstractions have a constant rate of 0.3 in/h. Time (hr) Precipitation (in) Unit hydrograph (cfs) 1 2 | 3 4 5 0.5 1.0 1.5 0.5 10 100 200 150 100 50