As described in the figure below, the infiltration method is performed by finding the loss difference between gross precipitation and observed surface runoff measured as a hydrograph (discharge vs. time curve). Gross precipitation rate (i) Volume of runoff a Volume of infiltration What parameter is represented in a? O Initial infiltration capacity O Equilibrium infiltration capacity O Constant infiltration O None of the choices O Phi index

As described in the figure below, the infiltration method is performed by finding the loss difference between gross precipitation and observed surface runoff measured as a hydrograph (discharge vs. time curve). Gross precipitation rate (i) Volume of runoff a Volume of infiltration What parameter is represented in a? O Initial infiltration capacity O Equilibrium infiltration capacity O Constant infiltration O None of the choices O Phi index

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter16: Highway Drainage

Section: Chapter Questions

Problem 9P

See similar textbooks

Similar questions

The length of a parking lot is L = 100 m, and it is sloped at So = 0.02. The surface of the lot is bare clay with a Manning roughness factor of n = 0.020. A rainstorm produces a constant rainfall excess at the rate of ?0 = 25 mm/hr. If td = 25 minutes: Determine the runoff hydrograph at the downstream end of the parking lot. Based on your answers in Step 1, draw your estimated hydrograph. ***Convert i0 to mJs. This conversion is not given and I cannot find it.
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.
Determine the water-application efficiency, the water-storage efficiency, and the water-distribution efficiency for the following conditions: stream of 80 lps delivered to the field for 5-hours, runoff averaged 40 lps for 2.5 hr, depth of root zone was 1.8 m, depth of penetration varied linearly from 1.8 m at one end to 0.6 m at the other end of the field. Ans. 76.5%, 66.7%, 90.6%
Design a sanitary sewer to serve a population of5,000 people, if the average water consumptionis 400 liters per capita per day (lpcd). How manyextra persons can be served if the slope isdoubled? Using "n" value of 0.013 in theManning's formula & the return flow as 70%.Check the minimum self-cleaning velocity.Neglect infiltration & inflow?
The 4 hourly rainfall data are given below. fo the initial value of the infiltration capacity is 6 mm/hr,and f0 the limit value of the infiltration capacity is 2 mm/hr and k is 0.4 1/hr. Hour: 1 Precipitation (mm): 4 Hour: 2 Precipitation (mm): 12 Hour: 3 Precipitation (mm): 17 Hour: 4 Precipitation (mm): 27 what is the runoff rate?
R The following table show the precipitation in (mm/hr.) observed at the rain gages (A, B, and C) which shown in figure belo 1. Find the average precipitation each hr. over the catchment by Thiessen method . 2. Draw a graphical relation between the average precipitation each hr. and the time. - 3. Find the (& and W- index), if the runoff volume=104.4 cm.km® thr.) 1 2 3 a 5 Rain gage A 5 | [45 [ | & 8 3 7 [35 = [ 2 % a 9 |20 | 12 | & ain gage c i 10km rain gage - ain gge 106m
Probability plotA bridge will be built over the Meherrin River near the site that the discharge measurements were taken for the log-normal probability plot below. The service life of the bridge is 40 years. If a design discharge of 23,000 cfs is used for the bridge: (a) what is the probability that the bridge will be flooded in any one year? (b) What is the probability that the bridge will be flooded at least once over its service life? (Note: just focus on the “theoretical line” in the plot)
Determine the time of concentration for use in the NRCS method for a drainage basin located in Hardin County, Ohio having the hydraulic path described below:Overland Average Grass L = 100’ S = 1.6% n = 0.24Shallow Concentrated L = 680’ S = 3.2%Stream Flow L = 2950’ S = 0.61% Cross Sectiono B = 12’o T = 20’o y = 4’o n = 0.035 COUNTY 2-yr ; 5-yr ; 10-yr ; 25-yr ; 50-yr ; 100-yr HARDIN 2.5 ; 3.0 ; 3.5 ; 4.2 ; 4.7 ; 5.3
The flow rates measured during a precipitation at the outlet of a basin with an area of 32400 hectares are given below. It is assumed that the precipitation intensity is constant 60 mm/hr and the infiltration index of the basin is 10 mm/hr. Determine the duration of the unit hydrograph and obtain the 60-minute unit hydrograph of the basin. You can take the base flow as 100 m³/s.
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:
The table below shows the observed rainfall intensity on a 2.26 km? catchment area. Estimate the o index if the observed runoff is 282 097 m3.
A catchment area of 150km 2 received a 150 cm of rainfall in a year. At theoutlet of the catchment the flow in the stream draining the catchment wasfound to have an average rate of 2.0m 3 /s for 3 months, 3.02.0m 3 /s for 6months and 5.02.0m 3 /s for 3 months. (a) what is the runoff coefficient of thecatchment? (b) If the afforestation of the catchment reduces the runoffcoefficient to 0.50, what is the increase in the abstraction from precipitationdue to infiltration, evaporation and transpiration, for the same annual rainfallof 150 cm.