Hydrograph Analysis Problem 7.11. Consider the hypothetical basin given in Problem 7.1. Constructa new storm hydrograph at outlet G for the given hyetograph assuming a D-index of 0.5 cm/hr and zero baseflow.comes to the outlet in 1 hour, from area B in 2 hours, etc. Construct the stormhydrograph at outlet G for the given hyetograph. (Assume that the infiltration isnegligible and the baseflow is zero).D1 km²i (cm/hr)3 km²2.5B4 km²1.5A2 km²a) Basin►t (hr)0 1 2 3 4b) HyetographFigure 7.28 Hypothetical basin and the hyetograph (Problem 7.1)

Approach to solving the question: Detailed explanation:Computing Excess Precipitation: The provided…

Answered: Problem 7.11. Consider the hypothetical…

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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A catchment has the Horton infiltration parameters: fo= 150 mm/h, fc = 50 mm/h, and k = 3 min¹. The design storm is given below. Estimate the time when ponding begins. Interval (min) Average rainfall (mm/hr) 20 40 80 170 90 20 0-10 10-20 20-30 30-40 40-50 50-60
IQ4// [A]: For a small drainage area, the infiltration rate at the start of rainfall storm was record to be 90 mm/hr and declined exponentially to a constant rate of 8 mm/hr after 2.5 hr. The total infiltration during 2.5 hr was 50 mm. Develop the Horton's equation for the infiltration rate at any time t<2.5 hr. [B]: Find the required discharge of irrigation water at the headwork of the distiriburatry, if the gross area is 20000 mishara, the irrigation intensity is 65%, and the water duty is 1600 hectare/m/sec.
(i) A catchment experiences a 2-hour duration isolated storm and the peak of the flood hydrograph due to this storm was found to be 220 m³/s. The total depth of rainfall was 47 mm. Estimate the peak of the 2-hour unit hydrograph of this catchment, assuming a constant base flow of 15 m 3/s and an average infiltration rate of 2.5 mm/hr. If the area of the catchment is 445 km², determine the base width of the 2-hour unit hydrograph assuming that the unit hydrograph is triangular in shape.
Question- A peak flow of a flood hydrograph due to a 6 hour storm is 470 m³/s. The corresponding average depth of rainfall is 8 cm. Assume an Infiltration loss of 0.25 cm/hour and a constant base flow of 15 m³/s. What is the peak discharge of 6 hour unit hydrograph for this Catchment?
Exercise [21 For a given basin, the following are the infiltration capacity rates at various time intervals after the beginning of the storm. Make a plot of the f-curve and establish an equation of the form developed by Horton. Also, determine the total rain and the excess rain (runoff). Time Precipitation rate Infiltration capacity (cm/hr) 3.9 (min) (cm/hr) 1 5.0 2 5.0 3.4 3 5.0 3.1 4 5.0 2.7 2.5 2.3 5.0 6. 7.5 7.5 7.5 2.0 10 1.8 7.5 7.5 2.5 2.5 2.5 12 1.54 14 1.43 16 1.36 18 1.31 20 1.28 22 2.5 1.25 Irigation Engineering Assignment No.1) Time Precipitation rate Infiltration capacity (cm/hr) 1.23 1.22 1.20 (min) (cm/hr) 24 26 28 2.5 2.5 2.5 30 2.5 1.20 Note: Excess rain (runoff) = Total precipitation Infiltration loss.
A 24 hour storm occurred over a catchment with 1.8 km2 area and the total rainfall observed was 10 cm. An infiltration capacity of 1 cm/hr initially and finally 0.3 cm/hr is obtained from Horton's curve with k = 5 hr-1. An IMD pan installed in the catchment indicated a decrease of 0.6 cm in the water level during 24 hours of its operation. What is the runoff from the catchment (in m3)? Assume pan coefficient = 0.7.
A peak flow of a flood hydrograph due 3 to a 6 hour storm is 470 m³/s. The corresponding average depth of rainfall is 8 cm. Assume an Infiltration loss of 0.25 cm/hour and a constant base flow 3 of 15 m³/s. What is the peak discharge of 6 hour unit hydrograph for this Catchment?
The flood hydrograph (resulting hydrograph) due to a 6 -h storm is 470 m³/s. The average depth of rainfall is 8 cm. Assume an average infiltration loss of (-0.25 cm/h) and a constant base flow of 15 m³/s, estimate the direct runoff hydrograph (DRH) and the discharge of the 6 -h unit hydrograph (UH) for this catchment.
Consider the following data for a drain L=50 m, a= 10 m, b D10.3 m, and k=1x 10 m/s If the drains carry 1% of average annual rainfall in 24 hrs, the average annual rainfall for which this system has been designed will be (a) 78 cm (c) 90 cm %3D (b) 84 cт (d) 96 cm
A 1.5 hr storm of intensity 25 mm/hr occurs over a basin for which the Horton’s equation is established as f = 6 + 16 e –2t. Determine the depth of infiltration in the first 45 min and the average infiltration rate for the first 75 min
The Horton's infiltration equation for a basin is given by fp = 6 + 16e-2t where fp is in mm/hr and t in hour. If a storm occurs on this basin with an intensity of more than 20 mm/hr, determine the depth of infiltration for the first 15 minutes and average infiltration rate for first 45 minutes.
a. Using the rainfall data provided in Table 1, the two-hour unit hydrograph given in Table 2, a index of 0.5 cm/h, and a baseflow of 20 m/s: Determine the surface runoff hydrograph from the 4-hour rainfall; Compute the peak streamflow and hour of occurrence; I. Estimate the volume of stream occurring between the fourth and eight hours. b. Use the two-hour Unit hydrograph to develop the five-hour unit hydrograph. Table 1 Rainfall data Time Interval (h) 0=2 2-4 Rainfall (cm) 3.5 2.5 Table 2 Unit hydrograph ordinates Time (hr) 1 2 4 5 10 UH (m/s) Activate GOo Settir 3 11 18 26 24 17 3. 00

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