2. During a 10 hour rainfall, precipitations in Table are observed. Table: Precipitations (mm) hour total precipitation (mm) 0-2 38 2-4 26 4-6 12 6-8 24 8-10 12 a) Considering that initial infiltration capacity is 30 mm/hour, limit value of infiltration capacity is 5 mm/hour, Horton parameter ---- is 0.3, calculate total infiltration and direct runoff. b) Assuming that depression and interception losses are ignorable,calcule and w indices.

2. During a 10 hour rainfall, precipitations in Table are observed. Table: Precipitations (mm) hour total precipitation (mm) 0-2 38 2-4 26 4-6 12 6-8 24 8-10 12 a) Considering that initial infiltration capacity is 30 mm/hour, limit value of infiltration capacity is 5 mm/hour, Horton parameter ---- is 0.3, calculate total infiltration and direct runoff. b) Assuming that depression and interception losses are ignorable,calcule and w indices.

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 15 mm rainfall is recorded over a small catchment according to the table below.Infiltration tests in the area have given the following Horton equation parameters:fo= 27 mm/hr; fc = 6 mm/hr; k= 3.5 hr.Time (hr) Rainfall intensity (mm/hr)0.00-0.25 400.25-0.50 30.50-0.75 120.75-1.00 16(a) Calculate the infiltration capacity as a function of time. It is assumed that the soil surface is always ponded with water.(b) Can the Horton equation be applied to calculate infiltration for thisrainfall event?
The 4 hourly rainfall data are given below. fo the initial value of the infiltration capacity is 6 mm/hr,and f0 the limit value of the infiltration capacity is 2 mm/hr and k is 0.4 1/hr. Hour: 1 Precipitation (mm): 4 Hour: 2 Precipitation (mm): 12 Hour: 3 Precipitation (mm): 17 Hour: 4 Precipitation (mm): 27 what is the runoff rate?
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.
(2) alu In fig. if o index = 8 mm/hr, then the rate of runoff and infiltration are --mm, 40 40 30 30 25 20 10 10 30 60 90 120 150 180 Time, min R=24 mm, F= 57.5 mm R= 57.5 mm, F=24mm R= 81.5 mm, F= 24 mm Rainfall intensity, mm/h
Exercise [2] 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 (min) (cm/hr) (cm/hr) 1 5.0 3.9 2 5.0 3.4 5.0 3.1 4 5.0 2.7 5.0 2.5 6. 7.5 2.3 8. 7.5 2.0 10 7.5 1.8 12 7.5 1.54 14 7.5 1.43 16 2.5 1.36 18 2.5 1.31 20 2.5 1.28 22 2.5 1.25 1 Irigation Engineering Assignment No.[1] Time Precipitation rate Infiltration capacity (min) (cm/hr) (cm/hr) 24 2.5 1.23 26 2.5 1.22 28 2.5 1.20 30 2.5 1.20 Note: Excess rain (runoff) = Total precipitation Infiltration loss.
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 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
Question 2. A 4-hour UH (GH) has the values shown below. Determine the runoff from a design downpour that will consist of the determined net precipitations: 20 mm/hr net precipitation for 2 hours, no precipitation for the next 2 hours, then 10 mm/hr precipitation for 2 hours. Assume that the groundwater base flow is a constant 3 m3/s during the design downpour time (hour) UH4 (m³/s) 0 0 2 2.35 4 7.00 6 9.75 8 7.50 10 4.20 12 1.80 14 0
The Horton's infiltration equation for a basin is given by f = 6 + 15 e ²t where fis in mm/hr and t is in hour. (i) What are the values of f f and k. (ii) A storm occurs on this basin with an intensity of more than 22 mm/hr, determine the depth of infiltration for the first 40 min and average infiltration for first 75 min.
Q3) Given the equation of infiltration curve for ascertain area given as following: I=1.3+4.2 *exp(-0.0063*t) and t in minute, compute the volume of runoff and Index of rainfall data shown below: Time (hour) 1 3 4 5 Rainfall (mm)6 8.5 12.8 12.2 6.5 3
2. A 15mm rainfall is recorded over a small catchment according to the table below. Infiltration tests in the area have given the following Horton equation parameters: a. Calculate the infiltration capacity as a function of time. It is assumed that the soil surface is always ponded with water. Can the Horton equation be applied to calculate infiltration for this rainfall event? fo = 27 mm/hr, f=6 mm/hr; k=3.5 hr. |Rainfall intensity (mm/hr) Time (hr) 0.00–0.25 40 0.25–0.50 3 0.50–0.75 12 0.75–1.00 16
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]