The hyetograph in the figure corresponds to arainfall event of 3 cm.Rainfall Intensity (mm/hour)0124.5151447530.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0Time(hour)If the rainfall event has produced a direct runoff of1.6 cm, the o-index of the event (in mm/hour, roundoff to one decimal place) would be

Given- Rainfall P=3 cmtime t=3.5 hrsRunoff R=1.6 cm=16 mmϕ-index needs to be calculated.

The hyetograph in the figure corresponds to a rainfall event of 3 cm. Rainfall Intensity (mm/hour) 0 12 4.5 15 14 4 75 3 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Time(hour) If the rainfall event has produced a direct runoff of 1.6 cm, the 6-index of the event (in mm/hour, round off to one decimal place) would be

The hyetograph in the figure corresponds to a rainfall event of 3 cm. Rainfall Intensity (mm/hour) 0 12 4.5 15 14 4 75 3 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Time(hour) If the rainfall event has produced a direct runoff of 1.6 cm, the 6-index of the event (in mm/hour, round off to one decimal place) would be

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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Plot the hyetograph of 20 min for this storm event over a specified watershed using the rainfall data given in the Table Q1. Indicate what is the storm duration and the total quantity of rainfall over this catchment area. 12:00 11:40 11:20 11:00 10:40 10:20 10:00 Time (hr) 107 107 82 57 32 16 0 Rainfall in successive intervals (mm)
Runoff data have been collected for a 4-hour storm over a 120 acre watershed as indicated in the table. If the total volume of water infiltrated during the storm was 3.0 Ac-ft and the Phi Index is 0.1 in/hr, sketch the rainfall hyetograph with EVERYTHING labeled appropriately. Also, report the depth and volume of precipitation (in inches and Ac-ft, respectively) for each 1-hour period.
What is the Duration of Effective Rainfall (Duration of the Unit Hydrograph)?
Q- A catchment area of 65 Sq. Km. in Gilgit received a rainfall of 12 cm 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 incremental rainfall intensity data given in the table below were recorded at a gage located on a small urban watershed. Using a 0.5‐hour time step: (a) Plot the rainfall Hyetograph. (b) Determine the total rainfall depth during the storm event. (c) If the runoff depth is 4.65 mm, find the phi- index in mm/ hr.
At a station, Storm I of 5 hour duration with intensity 2 cm/h resulted in a runoff of 4 cm and Storm II of 8 hour duration resulted in a runoff of 8.4 cm. Assume that the -index is the same for both the storms. The intensity of storm II (in cm/h) is:
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During a 6 hour storm, the total rainfall was recorded as 15 cm over an area of 900 km2. If the surface runoff determined from the hydrograph is 1x108 m3, calculate the phi-index.
please show steps and explain If the rainfall excess consists of two bursts of 3.3 in./hr and 1.8 in./hrs, each for 20 minutes, and the 20-minute UH (1”) hasordinates of 15, 40, 25, and 10 ft3/s, compute the distribution of direct runoff.
The ordiantes of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5cm for the first six hours and 15cm for the second six hours, compute the direct runoff hydrograph ordiantes and plot the hydrograph. (List all the DRH ordiantes in order)