If the mean annual runoff of a drainage basin of 10000 km? is 140 m/sec, and theaverage annual precipitation is 105 cm, Estimate the annual average ET for this basin.The mass curve of rainfall as one of the hydrological key concepts in a storm of totalduration 120 minutes as shown in table below. Estimate the amount of rainfall in this stormif the area of the watershed is 4000000 cm?.TableTime20406080100120(minute)CumulativeRainfall(cm)0.20.81.62.02.22.5

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Answered: If the mean annual runoff of a drainage…

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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Q2.The mass curve of an isolated storm in a 500 ha watershed is as follows: Time from start (h) 4 6. 8 10 12 14 16 Cumulative rainfall 0.8 2.6 4.1 7.3 10.8 11.8 12.4 12.6 (cm) 1- Draw the hyetograph for storm. 2- Estimate the o-index of the storm at the outlet of the watershed as 0.340 Mm³. the direct runoff produced by the storm is measured
The average rainfall values over a catchment in three successive 2-hour intervals are 3, 5 and 2 cm, respectively. The index for the catchment is taken as 0.2 cm/hour. The 2 hour unit hydrograph ordinates are given in table below. Time in hrs. Discharge m 0 2 4 m³/sec 0 10 40 6 14 16 70 50 20 10 6 0 Base flow can be taken as 7 m³/sec at the beginning of the storm linearly increasing to 9 m³/sec at 10 Hrs. after the beginning and then linearly decreasing to 8 m³/sec at 4 Hrs. after the end of direct run off. Compute the resultant flood hydrograph. 8 10 12
The rainfall intensity for each 20 min period are given below for a storm. The direct runoff from the basin is 2.5cm 20 MINUTES RAINFALL RAINFALL 1 2.5 2 5 a) What is the total storm rain? cm b) What is the Phi Ø index for the basin? 3 6.5 _cm/hr 4 3.5 5 1
1-In a storm, the excess rainfall of 0.5, 0.7,0 and 0.8 cm occurred in four successive hours. If the base flow is 0.5 m³/s, find the 1-hr unit hydrograph where the storm hydrograph is given below (Q in m³/s and t in hr): t 0 Q 0.5 1 2 3 4 5 44.5 110.5 85.5 102.8 94 6 38.4 7 18.6 8 9 10.9 5.3 10 11 0.5 2.9
Estimate the amount of depression storage for a storm occurring on a watershed with an area of 10 km2 and depression storage capacity of 100,000 m3 . The precipitation excess for the storm is 10 cm. Explain your calculation and state any assumption.
03: A flood was measured on a (240 km²) watershed the direct runoff from this flood amounted to (4.5 cm), the equivalent uniform depth of rainfall over watershed was (15 cm), and time distribution of rainfall is given in the table below. Find - Index and W-Index for this storm? Time (hr) I Rainfall (cm) 1.3 2 1.9 3 4.6 4 2.0 5 3.3 6 1.9
Example-1 A 4-hour storm occurs over an 80 km² watershed. The details of the catchment are as follows. Sub Area (km²) 15 25 35 5 Index (mm/hour) 10 15 21 16 1st hour 16 16 12 15 Hourly Rain (mm) 2nd hour 48 42 40 42 3rd hour 22 20 18 18 4th hour 10 Calculate the runoff from the catchment and the hourly distribution of the effective rainfall for the whole catchment.
3. The figure below shows 5 different isohyets in a watershed. Find the average rainfall using the isohyetal method Given: The left-most side area (Zone A) can be assumed to receive a rainfall of 1 cm. The area between the isohyets are given in the following table: A Zone A B C D E F B 1 cm D E 1.5 cm 4 cm Area (km²) 80 75 95 82 68 5 2.5 cm 3.5 cm
A catchment area is presented in the Figure 1. Six rainfall gauges A, B, C, D, E and F are spread over this watershed and nearby. The inter isohyets areas I, II, II, IV and V are given as 20, 50, 70, 90, and 10 km? respectively. All the rainfall and isohyets are given in cm. Estimate the mean precipitation over this catchment area using arithmetic mean and isohyetal methods.
Question- Hydrology The total rainfall in a catchment of area 1000 km² during an 8 hours storm is 24 cm, while the surface runoff due to the storm is 2 × 108 m³. The p-index is
A catchment area of 100 Sq. Km. in Gilgit received a rainfall of 1 mm from a 3-hours storm. At the outlet of the catchment, a natural stream had a steady flow of 10 cumecs before the storm and experienced a runoff lasting for 20 hours with an average discharge value of 90 cumecs. The stream was again to its original steady state with a flow of 10 cumecs. Estimate the losses and ratio of runoff to precipitation.
The mass curve of rainfall as one of the hydrological key concepts in a storm of total duration 120 minutes as shown in table below. Estimate the amount of rainfall in this storm if the area of the watershed is 4000000 cm2. Table Time 20 40 60 80 100 120 (minute) Cumulative Rainfall (cm) 0.2 0.8 1.6 2.0 2.2 2.5

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If the mean annual runoff of a drainage basin of 10000 km? is 140 m/sec, and the average annual precipitation is 105 cm, Estimate the annual average ET for this basin.