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 3 5.0 3.1 4 5.0 2.7 5 5.0 2.5 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 on Engineering Assignment ITT 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 [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 3 5.0 3.1 4 5.0 2.7 5 5.0 2.5 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 on Engineering Assignment ITT 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.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Given the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec. (Answer 20 cu ft/sec)
Given the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec.
Given the rainfall excess hyetograph and the 1-hr UH below: Time (hr) 0 1 2 3 4 5 6 7 8 Excess rainfall (in) 1 2 1 0.5 Direct runoff (cfs) 0 100 200 400 300 200 100 50 0 Compute the resulting storm hydrograph and assume no losses to infiltration and evapotranspiration
The following rainfall Heights were measured at a rainfall station. Draw a hyetograph of this precipitation. Calculate the infiltration Index Φ since the flow height is 44 mm.
Instantaneous infiltration rate can be estimated by the equation, f = 0.5(A / t0.5) + B, where ‘A’ and ‘B’ are constants and ‘t’ is the time elapsed from the beginning of the storm. Find total infiltration during 10 hours if A = 5 mm/h0.5 and B = 10 mm/h.
The flow rates measured during a precipitation at the outlet of a basin with an area of 32400 hectares are given below. It is assumed that the precipitation intensity is constant 60 mm/hr and the infiltration index of the basin is 10 mm/hr. Determine the duration of the unit hydrograph and obtain the 60-minute unit hydrograph of the basin. You can take the base flow as 100 m³/s.
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 infiltration in 4 hour?
A town covers 2000 acres with population density of 60 people/acre. Total wastewater production domestic= 125 gpcd, commercial+ industrial = 40 gpcd, and infiltration is computed at 400 gpd/acre. What are peak flows? Use tile GLUMRB peaking factor formula.
For a small drainage area, the infiltration rate at the start of rainfall storm was record to be 90 mm/hr and decreased 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
An infiltration capacity curve prepared for a catchment indicated an initial infiltration capacity of 2.5 cm/hr and attains a constant value of 0.5 cm/hr in 10hrs of rainfall with a Horton's constant k=6/day. Determine the following: 1. Draw the infiltration curve and provide labels 2. Calculate the infiltration rate at 3.5hrs. 3. Calculate the infiltration loss at t1=3.5 hrs t2=5.0hrs. 4. Draw the infiltration curve and shade the area bounded by the infiltration loss. Refer from the previous question 5. Calculate the infiltration loss at t1=3.5hrs t2=5.0hrs (exponential function) and t1=4.5hrs t2=7.30hrs (linear function) 6. Draw the infiltration curve and shade the area bounded by the infiltration loss. Refer from the previous question
Q3: An infiltration capacity curve prepared for a catchment indicated an initial infiltration rate of 2.5 cm/hr and attains a constant value of 0.5 cm/hr after 10 hours of rainfall with the Horton’s constant k = 1 per week. What will be the infiltration rate after 5 hours of rainfall? What will be the Infiltration loss in first 5 hours? Determine the total Infiltration loss. Subject : Hydology
An infiltration capacity curve has the following parameters: fc, the equilibrium infiltration capacity is 17 mm/hr; fo, the initial infiltration is 123 mm/hr; k, the rate constant is 0.4 hr-1; Two rainstorms pass over identical basins of area 80 km2 with the above characteristics. The first storm has a continuous rainfall of 50 mm/hr for 6 hours. The second storm has a rainfall of 75mm/hr for 1 hour, followed by 25 mm/hr for 1hour, followed by 75 mm/hr for 1hour, followed by 25 mm/hr for 1 hour, followed by 75 mm/hr for 1hour, followed by 25 mm/hr for 1 hour also for a total of six hours. Calculate the volume of infiltrated water (in m3) over the first hour, over the first four hours, and over the total six hours. Do so for each of the storms. Comment and try to explain any similarity or difference in the answers for the two storms.