Q4: If the height of the flood hydrograph resulting from a 6-hour rainstorm over a certain mountainous area is 470 m3/s, the average depth of the rainfall is 8 cm, the infiltration losses rate is 0.25 cm/hr and the basal flow rate is constant and is 15 m/s. Find the highest discharge value for a standard 6-hour hydrograph for this mount.

Q4: If the height of the flood hydrograph resulting from a 6-hour rainstorm over a certain mountainous area is 470 m3/s, the average depth of the rainfall is 8 cm, the infiltration losses rate is 0.25 cm/hr and the basal flow rate is constant and is 15 m/s. Find the highest discharge value for a standard 6-hour hydrograph for this mount.

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: If the height of the flood hydrograph resulting from a 6-hour rainstorm is over a certain mountainous plain, its value is 470 m3/s, average depth of rainfall 8 cm, average infiltration losses 0.25 cm hour and average The basal flow is constant and is 15 m3/s. Find the highest discharge value for a standard 6-hour hydrograph for this mount.
(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.
4. The peak of flood hydrograph due to a 3-h duration isolated storm in a catchment is 270 cumecs, Total depth of rainfall is 5:9 cm. Assuming an average infiltration loss of 0:3 cm/h and a constant base flow of 20 cumecs, estimate the peak of 3-h unit AK-21/258 ( Turn Over ) ( 6 ) hydrograph. If the area of catchment is given as 567 sq.km, determine the base width of 3-h unit hydrograph assuming it to be triangular in shape.
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.
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.
Question 1 A-6 hour storm occurred over a catchment of 1.8 km2 area and the total rainfall observed was 24 cm. An infiltration capacity curve prepared had the initial infiltration capacity of 2 cm/hr and attained a constant value of 0.5 cm/hr after 3 hours of rainfall with a Harton's equation constant, k = 5 hr-¹. An IMD pan installed in the catchment indicated a decrease of 0.8 cm in the water level during 6 hours of its operation, then the runoff from the catchment is _________cm. [Take pan coefficient = 0.7 and neglect other losses]
Q- The time of concentration at the outlet urban area catchment of 1.5 km² area with a run off coefficient of 0.42 is 28 minutes. The maximum depth of rainfall with a 50 year return period for this time of concentration is 48 mm. what is the peak flow rate at the outlet for this return period?
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?
The peak of flood hydrograph due to a 3-h duration isolated storm in a catchment is 300 m3/s. The total depth of rainfall is 7.5 cm. Assuming an average infiltration loss of 0.5 cm/h and a constant base flow of 25 m3/s, the peak of 3-h unit hydrograph (UH) of the catchment will be _m3/s
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.
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.
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.