A residential catchment has an area of 1.6 sq km. The catchment length from A, which is the catchment boundary, to the outlet B is 1250 m and the average ground slope is 3.5%. At the catchment location the 10-year storm has the intensity duration frequency relation given in eq 1. The surface cover has roughness coefficient of n=0.025 and the effective rainfall may be estimated as 4) 80% of the rainfall intensity from the IDF. Estimate the time of concentration 0.6 6.99| nL using Kinematic wave equation, the formula is te ;0.4 Vs. For a 10-yr storm: i=335.82– 60.95 In(t) – Eq1 where i is in mm/hr and t is the duration in minutes

A residential catchment has an area of 1.6 sq km. The catchment length from A, which is the catchment boundary, to the outlet B is 1250 m and the average ground slope is 3.5%. At the catchment location the 10-year storm has the intensity duration frequency relation given in eq 1. The surface cover has roughness coefficient of n=0.025 and the effective rainfall may be estimated as 4) 80% of the rainfall intensity from the IDF. Estimate the time of concentration 0.6 6.99| nL using Kinematic wave equation, the formula is te ;0.4 Vs. For a 10-yr storm: i=335.82– 60.95 In(t) – Eq1 where i is in mm/hr and t is the duration in minutes

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

A triangular direct runoff hydrograph due to a storm has a time base of 90 hours. The peak flow of 60 m³/s occurs at 20 hours from the start of the storm, the area of catchment is 300 km². The rainfall excess of the storm (in cm), is
A watershed channel is 20,000 m long with an E.L change of 20 m and an area of 200 km squared. Run off is 90 percent rainfall and the rest infiltrates. A 12 hr storm of 25 mm/hr precipitation occurs. What volume of water is discharged from the water shed?
A catchment has seven raingauge stations. In a year the annual rainfall recorded by the raingauges are as follows: Station P = 130.0 cm; Station Q = 142.1 cm; Station R = 118.2 cm; Station S = 108.5 cm; Station T = 165.2 cm; Station U = 102.1 cm; and Station V = 146.9 cm. For a 5% error in the estimation of the mean rainfall calculate the minimum number of additional stations required to be established in the catchment.
The peak of flood hydrograph due to a 3-hour duration isolated storm in a catchment is 270 m3/s. The total depth of rainfall is 5.9cm. The φ-index is 0.30 cm/hr and the baseflow is constant at 20m^3/s. Estimate the peak of the 3-hr UH of this catchment
A 6-hour rain of average intensity 2 cm/hour falls over the fern leaf type catchment as shown in Figurebelow. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours,respectively, to the site 0 where the discharge measurements are made. The values of the runoffcoefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attain aconstant value of 0.8 after 3 hours. Draw surface runoff hydrograph from the runoff collected from thecatchment and also calculate volume of direct Runoff.
4. In year 1996 the annual rainfall recorded the rain gauges are as follows: Station A N Rainfall 130.0 142.1 118.2 108.5 165.2 102.1 146.9 (cm) For a 5% error in the estimation of the mean rainfall, calculate the minimum number of additional stations required to be established in the catchment.
The excess runoff hydrograph from a catchment area 10 km² due to a storm of 6 hrs duration has been observed to be triangular in shape. The peak flow is observed to be 10 m³/s and the base length is 20 hrs. The rainfall excess in the catchment is
Consider the following data for a storm over catchment: 1. Total rainfall = 67.5 mm 2. Runoff depth = 57.5 mm 3. 0-index = 0.125 cm/hr The rainfall duration will be hr.
For the following rainfall rate, find the net runoff in cm, total rainfall and the value of W-index. Take Ø-index = 3.
1. Point rainfalls due to a storm at several rain-gauge stations in a basin are shown in Fig. 1. Determine the mean areal depth of rainfall over the basin by the isohyetal method. Zone I II III IV V VI Aren of bnain 6 cm Isohyetals. 5.5 cm VI 6 cm Ⓒ 7.3 cm O III 8 cm do 9.6 cm 10 cm 7.1 cm 8.9 cm 8.9 cm Ⓒ IV Fig. 1 Area (km²) 6 cm 56 192 420 244 44 58 1014 km² 7.6 cm III 5.1 cm 7.2 cm 8 cm 4 cm Ⓒ-Rain gauge stations 5.2 cm II -6 cm Basin boundary Ⓒ3.6 cm 5.6 cm 4 cm
A reservoir had a water surface elevation of 110 m above the datum at the beginning of the month. In the same month, the reservoir received an average inflow of 7.5 cms (m3/s) from surface runoff sources. For the same period, the outflow from the reservoir had an average value of 5 cms. Further, in the same month, the reservoir received a rainfall of 180 mm and losses due to evaporation of 5 cm. Assume the area of the lake is 50 km2 acres and assume no contribution from groundwater storage. What is the water surface elevation of the reservoir after the month?
Example4: Cumulative Rainfall depth 10 cm and cumulative runoff 5.8cm Find Ø - index if rainfall according following data : Time (hr.) 1 2 3 4 6 7 8. Rainfall intensity (cm.) 0.4 0.9 1.5 2.3 1.8 1.6 1 0.5