During a 6-hour storm the rainfall intensity was 0.8 cm/hr on a catchment of area 8.6 km². The measured runoff volume during this period was 2,56,000 m³. The total rainfall lost due to infiltration, evaporation and transpiration in

During a 6-hour storm the rainfall intensity was 0.8 cm/hr on a catchment of area 8.6 km². The measured runoff volume during this period was 2,56,000 m³. The total rainfall lost due to infiltration, evaporation and transpiration in

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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Question

During a 6-hour storm the rainfall intensity was
0.8 cm/hr on a catchment of area 8.6 km². The
measured runoff volume during this period was
2,56,000 m³. The total rainfall lost due to
infiltration, evaporation and transpiration in
cm/hr is
(a) 0.80
(b) 0.304
(c) 0.496
(d) Sufficient information not available
Vidsgeo

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Question During a 6-hour storm the rainfall intensity was 0.8 cm/hr on a catchment of area 8.6 km². The measured runoff volume during this period was 2,56, 000 m³. The total rainfall last due to infiltration, evaporation and transpiration in cm/hr is A 0.80 0.304 0.496 Sufficient information not available
Phi-Index Method The mass curve of an isolated storm in a 500 ha watershed is as follows: Time (hr) 0 2 4 6 8 10 12 14 16 18 Cumulative rainfall (cm) 0 0.8 2.6 2.8 4.1 7.3 10.8 11.8 12.4 12.6 If the direct runoff produced by the storm is measured at the outlet of the watershed as 0.340M m3, Determine the total ER and infiltration in cm. Estimate the Φ-index of the storm and the duration of the rainfall excess. Plot the hyetograph showing the Φ-index. Plot the ER.
The mass curve of an isolated storm in a 500 ha watershed is as follows: Time (hr) 4 6. 8 10 12 14 16 18 Cumulative 0.8 2.6 2.8 4.1 7.3 10.8 11.8 12.4 12.6 rainfall (cm) If the direct runoff produced by the storm is measured at the outlet of the watershed as 0.340M m3, • Determine the total ER and infiltration in cm. • Estimate the O-index of the storm and the duration of the rainfall excess. Plot the hyetograph showing the O-index. • Plot the ER.
Problem 2 A watershed having an area of 28 km² records the following rainfall data. Time Rainfall Time Rainfall (mm) 0.6 (mins) 150 180 210 (mins) 30 (mm) 3.4 60 1.1 2.2 90 1.7 1.3 120 2.5 240 0.2 Determine the infiltration rate (in mm/hr) using the o-index method if the runoff volume was found to be 224,000 m³.
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
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
Answer these both questions a. The total observed runoff volume during a 4 hr storm with uniform intensity of 2.8cm/hr is 25.2 x106 m3 from basin of 280km2 area. What is the average infiltration rate for the area. b. A volume of 3x106 m3 of groundwater was pumped out from unconfined aquifer uniformly over an area of 5 km2. The pumping lowered the water table from 102 to 99m. The specific yield of the aquifer is?
a) Table shows total rainfall for each month of the year 2012 for a 200 m² sub- basin located upstream. If the average daily evaporation is considered as 2 mm/day throughout the year and total runoff generated is 70% of the total rainfall, determine the amount of water stored or infiltrate in the sub-basin on average each month in unit m?. Consider the rainfall to be uniformly distributed across catchment and use 30 days for each month in the calculation. Month 4 5 6 1 2 7 8. 10 11 12 Total rainfall (mm) 45 14 24 13 20 24 17 25 21 37 43 65
Example 3 * In a 350 ha catchment the CN value was assessed as 70 for AMC-III. (a) Estimate the value of direct runoff volume for the following 4 days of rainfall. The AMC on July 1st was category II. Use standard SCS-CN equation Date July 1 July 2 July 3 July 4 Rainfall (mm) 50 20 30 18 (b) What would be the runoff volume if the CN value were 80? 41
2) Compute the peak runoff, qp, using the NRCS Methbd for a 100 year storm for a drainage basin located near Atlanta, Georgia, and having the following parameters: Am 1.413 s.m. CN = 68.0 tc = 2.35 hours
1.16 m#/s O Average runoff from a 600 km2 catchment area was measured as 60 m3/s for a 3-hr period .lf the depression storage is 10 cm and infiltration is 0.8 in, ? what is the depth of rainfall (precipitation) in m 0.22924 m O 0.33923 m 0.11924 m O In fig. if o index = 8 mm/hr, then the rate of runoff and infiltration are ----- --mm, -mm
. During a 6-hour storm, the rainfall intensity was 0.8 cm/hour on a catchment of area 8.6 km². The measured runoff volume during this period was 2,56,000 m³. The total rainfall was lost due to infiltration, evaporation, and transpiration (in cm/hour) is