- The total observed runoff volume during a storm of 6-hr duration with a uniform intensity of 15 mm/hr is 21.6 Mm'. If the area of the basin is 300 km², find the average infiltration rate and the runoff coefficient for the basin
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- 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 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 0.878During 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 VidsgeoQuestion No. 03 A storm with 60 cm of precipitation produced a surface runoff of 33.2 cm. using the storm data shown in Table. Apply index approach to calculate. i) The constant rate of infiltration ii) Runoff coefficient Storm Duration (hrs) 3 9. 12 15 18 21 24 Depth of Rainfall (cm) 2.4 5.4 13.8 10.8 9.6 6. 3
- A 0.10 mi2 parking lot has a runoff coefficient of 0.8 and a time of concentration of 40 minutes. For the following three rainstorms, determine the peak discharge (in ft3/s) using the Rational Method. a. 4.0 in/hr for 10 minutes b. 1.0 in/hr for 40 minutes c. 0.5 in/hr for 60 minutesA 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.For a given basin, the following are the infiltration capacity rates at various time intervals after the beginning of the storm. Make a plot of the f-curve and establish an equation of the form developed by Horton. Also, determine the total rain and the excess rain (runoff). Time Precipitation rate Infiltration capacity (em/hr) (min) (cm/hr) 1 5.0 5.0 3.9 2 3.4 3 5.0 3.1 4 5.0 2.7 5.0 7.5 7.5 2.5 2.3 8 2.0 10 7.5 1.8 7.5 7.5 2.5 2.5 2.5 1.54 1.43 1.36 12 14 16 18 1.31 20 1.28 22 2.5 1.25 Irigation Engineering Assignment No.(1) Time Precipitation rate Infiltration capacity (em/hr) (min) (em/hr) 2.5 2.5 2.5 24 1.23 26 1.22 28 1.20 30 2.5 1.20 Note: Excess rain (runoff) = Total precipitation Infiltration loss. %3D
- Question 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 is A 0.80 0.304 0.496 Sufficient information not availablePhi-Index Method The mass curve of an isolated storm in a 500 ha watershed is as follows: Time (hr) 0 2 4 6 8 10 12 14 16 18 Cumulative rainfall (cm) 0 0.8 2.6 2.8 4.1 7.3 10.8 11.8 12.4 12.6 If the direct runoff produced by the storm is measured at the outlet of the watershed as 0.340M m3, Determine the total ER and infiltration in cm. Estimate the Φ-index of the storm and the duration of the rainfall excess. Plot the hyetograph showing the Φ-index. Plot the ER.Exercise [21 For a given basin, the following are the infiltration capacity rates at various time intervals after the beginning of the storm. Make a plot of the f-curve and establish an equation of the form developed by Horton. Also, determine the total rain and the excess rain (runoff). Time Precipitation rate Infiltration capacity (cm/hr) 3.9 (min) (cm/hr) 1 5.0 2 5.0 3.4 3 5.0 3.1 4 5.0 2.7 2.5 2.3 5.0 6. 7.5 7.5 7.5 2.0 10 1.8 7.5 7.5 2.5 2.5 2.5 12 1.54 14 1.43 16 1.36 18 1.31 20 1.28 22 2.5 1.25 Irigation Engineering Assignment No.1) Time Precipitation rate Infiltration capacity (cm/hr) 1.23 1.22 1.20 (min) (cm/hr) 24 26 28 2.5 2.5 2.5 30 2.5 1.20 Note: Excess rain (runoff) = Total precipitation Infiltration loss.
- Question 2. A 4-hour UH (GH) has the values shown below. Determine the runoff from a design downpour that will consist of the determined net precipitations: 20 mm/hr net precipitation for 2 hours, no precipitation for the next 2 hours, then 10 mm/hr precipitation for 2 hours. Assume that the groundwater base flow is a constant 3 m3/s during the design downpour time (hour) UH4 (m³/s) 0 0 2 2.35 4 7.00 6 9.75 8 7.50 10 4.20 12 1.80 14 0The streamflow data given in the table was produced by a storm of 1-hour duration considered to have uniform intensiry over the catchment. If the catchment area is 5 km', calculate the equivalent runoff depth for the catclument. Q. Total (n/s) flow Q. (n/s) Time Baseflow (hr) 2.80 2.80 2.78 2.60 3 6.23 2.60 14.50 2.60 16.57 2.60 13.03 2.60 7. 9.35 2.60 5.95 2.60 4.25 2.60 10 2.97 2.60 2.12 2.12 12 1.70 1.70 13 1.53 1.53 14 1.53 1.53Question civil engineering- 3 The total observed runoff volume during a 6h storm with a uniform intensity of 1.5cm/hr is 23.04×106 m³ from a basin of 320 km² of area. The average infiltration rate for the basin is mm/hr **