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MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305577398
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Chapter 16, Problem 8P
To determine
The runoff rate for a storm of
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4. For an urban area, the land use of the area and the corresponding runoff coefficients are
given below. Calculate the equivalent runoff coefficient. Assume the intensity of rainfall as
103.8 mm/hr. Estimate the peak flow rate for this area. (1 ha = 10 m)
Runoff coefficient
Land use
Roads
Residential area
Industrial area
Area
0.7
50
0.3
10
0.8
Determine the peak runoff (Nearest whole number) from a 100-year storm for the watershed described below: Field 1: 192 acres, 2% slope, cultivated, sandy soil Field 2: 38 acres, 8% slope, pasture, tight clay soil Field 3: 40 acres, 11% slope, woodland, silt soil The drainage way is 4000 feet with a 0.1% slope.
A watershed has an area of 3.9
acres, a runoff coefficient of 0.66
and an inlet time of 12.2 minutes.
The design precipitation intensity in
a watershed is given by:
i = 125.2T0.175/(Td +27)
where i is the intensity in inches per
hour, T is the return period and Td is
the duration in minutes.
Determine the design discharge for
a 100-year return period in ft³/s.
Chapter 16 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
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- 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)?arrow_forward1. A 160-acre drainage basin has the following characteristics: Land Use Residential, flat, 60% impervious Residential, flat, 30% impervious Concrete or sheet asphalt pavement Turf Meadows Forested Area * for a range of values, the runoff coefficient can be calculated as an average value. Rainfall Intensity (in/hr) Find the peak runoff from the drainage area for a 20-minute duration storm with a return frequency of 25-years? 20 18 16 14 2 0 0 Frequency (years) 100 50 25 10 10 Area % 20 30 5 25 20 20 30 Duration (min) Coefficient (C)* 0.55 0.40 0.85 0.25 0.2 40 50 60arrow_forwardThe runoff from a drainage basin area 4320 km2 is estimated as 10000 cumec-days. What is the depth of runoff? O 43.2 cm O 40 cm O 21.6 cm O 20 cmarrow_forward
- A catchment area has a time of concentration of 20 minutes, an area of 20 has. and a runoff coefficient of 0.25. Estimate the peak discharge corresponding to a 25-year period if the intensity-duration-frequency for the storm in the area can be expressed byarrow_forwardProblem 2 A watershed having an area of 28 km² records the following rainfall data. Time Rainfall Time Rainfall (mm) 0.6 (mins) 150 180 210 (mins) 30 (mm) 3.4 60 1.1 2.2 90 1.7 1.3 120 2.5 240 0.2 Determine the infiltration rate (in mm/hr) using the o-index method if the runoff volume was found to be 224,000 m³.arrow_forwardQuestion During a 6-hour storm the rainfall intensity was 0.8 cm/hr on a catchment of area 8.6 km². The measured runoff volume during this period was 2, 56, 000 m³. The total rainfall last due to infiltration, evaporation and transpiration in cm/hr isarrow_forward
- Q2 Q3 A small watershed consists of 2 km² of forest area (c = 0.1), 1.2 km² of cultivated area (c = 0.2) and 1 km² under grass cover (c = 0.35). A watercourse falls by 20 m in a length of 2 km. The IDF relation for the area may be taken as: I = Estimate the peak rate of runoff for a 25-year frequency. 807 0.2 -; I in cm/hr, T- yr, t in minutes. (t+12) ⁰.5 103 2-R-[IA+E]] =ASarrow_forward2.2 cm of runoff results from a storm that lasted 24 hours over an area of 195.0 km². Assume all the runoff goes into a nearby river channel that was empty at the beginning of the storm, what is the average flow of the water in the channel in ft³/s and m³/s.arrow_forward4) Compute the peak runoff, Qp, for a 15 year storm using the Rational Method for a drainage basin located in Atlanta, Georgia, and having parameters as follows: A = 14.06 Acres Impervious: 0.06 acres Grass: 6.5 acres Woods: 7.5 acres Overland Flow: Average Grass, 100' long, 5.0% slope Shallow Concentrated Flow: 50' long, 7.0% slopearrow_forward
- Sample Problem Given the following observed flows from a storm of 3-hr duration on a watershed with a drainage area of 10 sq. km. Assume that the base flow at the end of the runoff period is 6.0 cubic meters per second. TIME Q (hours) (m³/s) 1 6.0 2 15 3 25 4 21 5 13 6 6.0 1. Determine the direct runoff hydrograph by separating the baseflow. 2. Derive the unit hydrograph (for 1 centimeter of direct runoff) for the 3-hr rainfall.arrow_forwardRain falls on a 0.05 mi² urban catchment with an intensity of 0.85 in/hr. for a duration of 3 hrs. The soil is classified as SCS hydrologic group C in the entire catchment. Land use within the catchment is as follows: 1) 20% area is business district 2) 40% area is residential district 3) 20% area is forest 4) 20% area is cropland Determine the total runoff volume in ft³.arrow_forwardCompute the runoff from 5 inches of rainfall on a 1000-acre watershed. The hydrologic soil group is 50 percent Group B and 50 percent Group C interspersed throughout the watershed. Antecedent moisture condition II is assumed. The land use is given below followed by the reference table for Runoff CNs.arrow_forward
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