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 a • Determine the total ER and infiltration in cm. • Estimate the d-index of the storm and the duration of the rainfall excess. • Plot the hyetograph showing the d-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 a • Determine the total ER and infiltration in cm. • Estimate the d-index of the storm and the duration of the rainfall excess. • Plot the hyetograph showing the d-index. • Plot the ER.

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

Q.24 Over a basin of area 333 km², there was a storm for 6 h with a uniform intensity of 2 cm/h. The observed runoff was 20×106 m³. The average rate of 3 infiltration for the basin was A 5 mm/h B 10 mm/h C 20 mm/h D 40 mm/h
Calculate phy-index
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
Net Storm Rainfall Example 2-1 Rain falls as shown in the rainfall hyetograph (intensity Vs. time) in Fig. E2-1 (a). The o index for the Storm is 0.5 in./hr and is constant over 5 hr. Plot the net rainfall on the hydrograph (flow vs. time) given in Fig. E2-1 (a). Determine the total volume of runoff and the watershed area. 1cfs = 1.008 ac-in/hr 2.0 1.5 1.0 0.5 1 3. 4 Time (hr) 700 600 500 400 300 200 100 4 8 12 16 20 24 Time (hr) Time (hr) Q (cfs) Volume (cfs-hr) 0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 16-18 18-20 20-22 22-24 24-26 16 Q (cfs) iT (in./hr)
Q2. Two storms having duration of 4-hv and 2.hr respectively. If the rainfall excess values for the two storms were 2cm f 3cm respectively occurs Successive calculate the resulting direct runoff hydrographif the 2-hr UH For the Catchment is given below Time hr 2 4 G 10 12 14 16 18 2hr UH 25 50 75 125 100 60 20
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.
2 %V9 li. 3 (9 This question requires one response per row The base flow for this direct runoff hydrograph is: 0 4 8h o Index = 0.135 cm/h Rainfall excess = 5.52 cm 30 25 20 15 Direct runoff 5.52 cm 10 A Base flow -6 0 12 18 24 30 36 42 48 54 60 66 Time in hours -6 8 5.52 48 Discharge (m/s) 3.26 cm 2.26cm