Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 16, Problem 9P
To determine
The runoff rate for a storm of
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For the following rainfall rate, find the net runoff in cm, total rainfall and the value of W-index. Take Ø-index = 3.
Time (min)
10
20
30
40
50
60
70
Rain rate (cm/hr)
2.5
2.5
10
7.5
1.25
1.25
5
The ordinates of a hydrograph of surface runoff resulting from 4.5cm of rainfall excess of duration 8 hours in a catchment are as follows. Determine the ordinates of the 8h unit hydrograph for this catchment. Tabulate your solution and plot the 8H-UH.
Three cm of rain falls on a 20,000 hectares catchment area during a 24 hours period. If 70% of rainfall runs off, calculate the average rate of runoff in m3/s if runoff lasts for 72 hours. Show complete solution.
Chapter 16 Solutions
Traffic and Highway Engineering
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- Information on the 50-year storm is given Duration (minutes) 15 30 45 60 180 Rainfall (mm) 40 60 75 100 120 A culvert has to drain 200 ha of land with a maximum length of travel of 1.25 km. The general slope of the catchment is 0.001 and its runoff coefficient is 0.20. Estimate the peak flow by the rational method for designing the culvert for a 50-year floodarrow_forwardDuring 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.arrow_forwardA rainfall excess of 2.1 cm in 1 hour produced a triangular runoff hydrograph with a peak of 20 m3/s at 2 hours and a return to zero at 10 hours. According to the UH theory, the runoff hydrograph for rainfall excess of 4.2 cm in the same time period: A) would have a peak of 40 m3/s and a total runoff period of 20 hours B) would have a peak of 40 m3/s at 4 hours C) would have a total volume of 720 000 m3 and a peak of 40 m3/s D) Cannot be determined since the unit is not 1 cmarrow_forward
- Given in the table below is a stream flow hydrograph. Determine the volume of direct runoff by separating the base flow using the recession curve method. Semilogarithmic plot of the hydrograph is shown in Fig B.arrow_forwardA reservoir is to be constructed with the following characteristics: Mean Annual Runoff, MAR =50mm Catchment Area = 286km2 Coefficient of Variation CV= 110% Full Supply Capacity FSC = 8x 106m3 What is the probability that the reservoir will fill to full capacity from empty in one year assuming that the runoff data follows the Weibull distribution function? P(X-x) = 1-e^(aX/x)barrow_forwardIn a typical 3 hours storm producing 60 mm runoff from a basin and its flow ordinate are presented below estimate the peak flow and its time of occurrence in a flood created by 6 hours storms which produces 30 mm of the runoff during the first 3 hours and 45 mm runoff during the second 3 hours. plot the flow hydrographarrow_forward
- Table below gives the time distribution of a rainfall lasting for nine hours. If the direct runoff is 9.3 cm, determine the Ø‐index of the storm and the time of rainfall excess.arrow_forwardFor the following rainfall rate, find the net runoff in cm, total rainfall and the value of W-index. Take Ø-index = 3.arrow_forwardA catchment area of 150 km2 received 150 cm of rainfall in a year. At the outlet of the catchment, the flow in the stream draining the catchment was found to have an average rate of (i) 2.0 m3/s for 3 months, (ii) 3.02 m3/s for 6 months, and (iii) 5.02 m3/s for 3 months. (a) What is the runoff coefficient of the catchment? (ii) If the afforestation of the catchment reduces the runoff coefficient to 0.35, what is the increase in the abstraction from precipitation due to infiltration, evaporation and transpiration for the same annual rainfall of 150 cm? please convert in m/sarrow_forward
- Given in the table below is a stream flow hydrograph. Determine the volume of direct runoff by separating the base flow using the recession curve method. Semilogarithmic plot of the hydrograph is shown in Fig B. please show solutions. Thank youarrow_forward8. A basin is divided by 1-h isochrones into four sub-areas of size 200, 250, 350 and 170 hectares from the upstream end of the outlet respectively. A rainfall event of 5-h duration with intensities of 1.7 cm/h for the first 2 h and 1.25 cm/h for the next 3 h occurs uniformly over the basin. Assuming a constant runoff coefficient of 0.5, estimate the peak rate of runoff. (An isochrone is a line on the catchment map joining points having equal time of travel of surface runoff)arrow_forwardIn a given year, a watershed with an area of 2500 km^2 received 130 cm of precipitation. The average rate of flow measured in a gage at the outlet of the watershed was 30 m^3/s, mostly as a result of runoff. Estimate the water losses due to the combined effects of evaporation, transpiration, and infiltration to ground water. A) How much runoff reached the river for the year (in cm)? B) Compute the runoff coefficient for this watershed. Remember that the runoff coefficient is the ratio of runoff to precipitation.arrow_forward
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