The rational formula runoff coefficient of a 950 ft x 600 ft property is 0.35. A storm occurs with a rainfall intensity of 4.5 in/hr. The peak runoff from this property is most nearly Select one: a. 21 cfs b. 90 cfs C. 62 cfs d. 30 cfs
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- a paved lot that is 150m by 150m sloped in one direction at a rate of 2% has the time of concentration of 6minutes and a five year storm with duration of 6minutes with an intensity of 12mm per hour.the runoff coefficient for this parking lot is 0.83. a.using rational method determine the amount of runoff that would occur for the parking lot b.the runoff from part a be contained in a trapezoidal drainage ditch with the following properties side slope=2m horizontal for every 1m rise width of invert=2m longitudinal slope=0.006m/m roughness coeffiecient =o.070 if the maximum permitted depth of water is 100mm which gives a cross section area of flow=0.22m^2 and a wetted perimeter 0f 2.4 using manning s equation for open channel flow,determine if the ditch will be able to accomodate the flow in part ao. Determine the mean runoff flow in cfs from a drainage area of 175 acres using the English equation for a 25-yr frequency in inches per hour in Nevada, The area is sloping at 2% and is covered with poor surface grass. The furthest point from the inlet is 72 meters.One of the following storms is excessive and causing runoff according to Konhke Select one a . 10 mm rainfall and 6min duration b . 12 mm rainfall and 1.1hour duration c . 22 mm rainfall and 15 min duration d . 15 mm rainfall and 1.2 hour duration
- What is the peak discharge from the grounds of the Miami Park during a 10-year storm? Assume that the time of concentration of the grounds is 1.5 hours. The composition of the grounds is as follows: Intensity, mm/h 200 Use the lower range values from the Table 4.4 and IDF curves for Miami, FL given in the cheat sheet. 150 100 50 0 Residential Selected runoff coefficients Description of area or character of surface Business Downtown Neighborhood Single-family Multi-units, detached Multi-units, attached Character of surface Parking lot, brick Playgrounds Lawns, sandy soil 2.0% slope 7.0% slope Residential (suburban) Apartment Industrial Light Heavy Parks, cemeteries Playgrounds Runoff coefficient 2 Duration, h (c) Miami (1911–1951) 0.70 to 0.95 0.50 to 0.70 0.30 to 0.50 0.40 to 0.60 0.60 to 0.75 0.25 to 0.40 0.50 to 0.70 0.50 to 0.80 0.60 to 0.90 0.10 to 0.25 0.20 to 0.35 2 years 10 years Area (m²) 15,450 10,100 Return period 45,000 120,600 3 5 years 25 years Railroad yard Unimproved…In a peak storm day the amount of precipitation occurred was 21 cm for a 3 hours continuously and the rate of percolation was 60 mm. Determine the surface runoff flow for storm?1. (. .. .*) Calculate the peak runoff, cfs, for a 10-year storm using the rational method located in Columbus Ohio Area=150 Acres Unimproved Area with 10% slope
- B) The rates of rainfall for the successive 30 min period of a 3-hour storm are: 1.6, 3.6, 5.0, 2.8, 2.2, 1.0 cm/hr. The corresponding surface runoff' is estimated to be 3.6 cm. Establish the -index and its coefficient of runoff.A 125-acre urban drainage area consists of three different watershed areas as follows: Downtown Area 50% Parks 15% Playgrounds 35%----If the time of concentration for the drainage area is 1.5 hr, determine the runoff rate for a storm of 50-yr frequency. Assume that the rainfall-intensity curves in Figure 16.2 are applicable to this drainage area. Determine Q. *3. Determine the direct runoff, the P-index, and the excess rainfall hyetograph for the storm given below. The water shed is 7.0 mi?. Label x and y axis for your graph. The baseflow is 300 cfs. Precipitation Time Set A Set B Set C Streamflow hr in in in cfs 0.00 0.00 0.00 150 0.5 0.10 0.10 0.10 180 1.0 0.40 0.40 0.40 200 1.5 1.50 1.60 1.70 800 2.0 2.50 2.60 2.70 2000 2.5 2.00 2.10 2.20 5000 3.0 0.40 0.40 0.40 9000 3.5 0.10 0.10 0.10 10000 4.0 8000 4.5 4000 5.0 2500 5.5 1800 6.0 1100 6.5 700 7.0 300 7.5 290 8.0 270
- 1. 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 60Can Please Help Me: Civil Engineering 60 minutes only the given time. Wish you could help me. I will give UPVOTE and GOOD FEEDBACK. //Question Estimate the peak runoff rate from a 20-hectare drainage basin if rainfall depth for 6 hours reached 60 mm. Use typical runoff coefficient of 0.35. [Ans. 0.2cms] //QuestionA 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). The watershed has soil group B. Determine the runoff volume for 10-year, 24-hr rainfall event (use the IDF below) 20.0 15.0 10.0 8.0 RAINFALL INTENSITY IN INCHES PER HOUR 6.0 4.0 6 0.1 0.08 0.06 0.04 0.02 5 VDOT B, D & E eqn. except for 1-year NOAA Atlas 14 Vienna/Tysons for 1-year 10 15 20 MINUTES SHINE RETURN PERIOD (YEARS) 30 40 50 60 N 10 DURATION NOAA Atlas 14 Vienna/Tysons 2 3 4 5 6 HOURS 8 10 12 سلسلي 18 24