Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 16, Problem 8P
To determine
The runoff rate for a storm of
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A 200-acre urban drainage area consists of three different watershed areas as follows: (i) 100-acre of Flat residential (30% impervious area); (ii) 60-acre of Moderately steep residential (50% impervious area); and (iii) 40-acre of Flat commercial (90% impervious area) = 20%. Using the rational formula, determine the runoff rate for a storm of 100-year frequency. Assume that the FHWA/NJ-82-004 rainfall intensity curves are applicable to this drainage area and the following land characteristics apply: fallow or minimum tillage cultivation ground cover with 3% average slope of overland area. Overland flow length = 0.5 miles.
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.
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- 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.arrow_forwardDuring 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 lost due to infiltration, evaporation and transpiration in cm/hr is (a) 0.80 (b) 0.304 (c) 0.496 (d) Sufficient information not available Vidsgeoarrow_forwardIn 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_forward
- The 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_forwardA 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 by KT* i = D + a where i = intensity in cm/hr. T = return period in years, and D = duration of storm in hours; The coefficients are: K = 6.93, x = 0.189, a = 0.50 and n 0.878arrow_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_forward
- Problem 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_forwardQ2 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_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
- 1. The 1-hr unit hydrograph for a watershed is given below. Determine the runoff for the third time interval from this watershed for the storm pattern given. The abstractions have a constant rate of 0.3 in/h. Time (hr) Precipitation (in) Unit hydrograph (cfs) 1 2 | 3 4 5 0.5 1.0 1.5 0.5 10 100 200 150 100 50arrow_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_forwardA watershed 600 ha in area experienced a rainfall of uniform intensity 2.0 cm/h for duration of 8 hours. If the resulting surface runoff is measured as 0.6 Mm^3,the average infiltration capacity during the storm is A. 0.75 cm/hr B. 1.0 cm/hr C. 1.5 cm/hr D. 2.0 cm/hrarrow_forward
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