An effective rainfall of 2 hour duration produced a flood hydrograph peak of 200 m³/s. The flood hydrograph has a base flow of 20 m³/s if the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour the peak of 2-hour unit hydrograph (in m³/s up to one decimal place) is

An effective rainfall of 2 hour duration produced a flood hydrograph peak of 200 m³/s. The flood hydrograph has a base flow of 20 m³/s if the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour the peak of 2-hour unit hydrograph (in m³/s up to one decimal place) is

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.6P

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An effective rainfall of 2-hour duration produced a flood hydrograph peak of 200 m³/s. The flood hydrograph has a base flow of 20 m3/s. If the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour, the peak of 2- hour unit hydrograph (in m³/s-cm, up to one decimal place) is
PROBLEM 2: Using the cumulative rainfall hyetograph given below for a 150-km2 watershed, determine the abstractions and the excess rainfall hyetograph using Horton's equation with fo = 40 mm/h, fe = 10 mm/h, and k = 2 h-1. Assume that an interception storage of 10 mm is satisfied before infiltration begins. Also, determine the depth and volume of excess rainfall and its duration. Time (h) 1 2 3 4 5 6 Cumulative rainfall (mm) 25 70 115 140 160 180
An effective rainfall of 2 hour duration produced a flood hydrograph peak of 200 m³/s. The flood hygrograph has a base flow of 20 m³/s. If the spatial average rainfall in the watershed for the duration of storm is 2 cm and the average loss rate is 0.4 cm/hour, the peak of 2-hour unit hygrograph (in m³/s-cm up to one decimal place) is
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 direct runoff hydrograph due to an isolated storm with on effective rainfall of 3.6 cm was trapezoidal in shape as shown in figure. The hydrograph corresponds to a catchment area of : Discharge (cumes) 100 cumes - 6 hours 78 hours Time (hr)
3. For a 2 hour, 8 mm/h intensity rainfall, the hydrograph given in Table is observed. The area of watershed is 500 km² Table: Propeller readings Time 0 flow rate (m³/s) 8 2 4 6 14 18 30 8 10 12 45 38 28 14 16 18 20 22 24. 18. 14 10 a) Obtain 2 hour unit - hydrograph for the considered flow section b) Obtain 4 hour unit- hydrograph for considered flow section. c) Obtain the hydrograph of a rainfall with 4 hour duration and 10 mm/h intensity. 24 8 8
QUESTION 3 10 A storm with 10 cm precipitation produced a direct surface runoff of 5.8 cm in the equivalent depth unit. The time distribution of the storm is given in Table below. Estimate the @-index of the storm and the excess rainfall hyetograph. Time from start (hr) Incremental 0.4 rainfall in each hr (cm) 4 6. 0.9 1.5. 3.3 T.7 1.6 1.0 0.5
A storm with 12 cm precipitation produced a direct surface runoff of 7.2 cm in the equivalent depth unit. Assume the duration of the excess rainfall (te) is equal to the total duration of the storm for the first trial, te = 5 hr. Compute the trial value of Ø
Question- A peak flow of a flood hydrograph due to a 6 hour storm is 470 m³/s. The corresponding average depth of rainfall is 8 cm. Assume an Infiltration loss of 0.25 cm/hour and a constant base flow of 15 m³/s. What is the peak discharge of 6 hour unit hydrograph for this Catchment?
In a year, a 120 cm of rainfall received by a watershed with an area of 140 km2. The flow in the stream draining the watershed was found to have an average rate of 2.0 m3/s for 3 months, 3.0 m3/s for 6 months and 5.0 m3/s for 3 months. a.) what is the total outflow volume within the period in m3? b.) what is the runoff coefficient of the watershed? c.) if the afforestation of the watershed reduces the runoff coefficient to 0.50, what is the increase in the abstraction from precipitation due to infiltration, evaporation and transpiration, for the same annual rainfall of 120 cm (in m3)?
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. 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 cm?. Table Time 20 40 60 80 100 120 (minute) Cumulative Rainfall (cm) 0.2 0.8 1.6 2.0 2.2 2.5
One hour triangular unit hydrograph of a watershed has the peak discharge of 60 m^3/sec. cm at 10 hours and time base of 30 hours. The  index is 0.40 cm per hour and base flow is 15 m^3/sec. (i) Compute the catchment area of the watershed in km^2. (ii) Compute the ordinate of the flood hydrograph at 15th hour, If the rainfall is 5.4 cm. in 1 hour.