A catchment consists of 30% area with runoff coefficient 0.40 with the remaining 70% area with runoff coefficient 0.60. The equivalent runoff coefficient will be
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- Problem 3. A 50-ha catchment has the following time-area relationship. Estimate the runoff hydrograph (cumecs) using the time-area method for a 30-min rainfall hyetograph given. Time (min) Contributing area (ha) 10 15 20 10 25 30 30 50 Time (min) Average rainfall intensity (cm/hr) 0-5 10 5-10 8. 10-15 15-20 4 20-25 25-30 1Problem 3. A 50-na catchment has the following time-area relationship. Estimate the runoff hydrograph (cfs) using the time-area method for a 30-min rainfall hyetograph given. Time (min) Contributing area (ha) 1 10 15 20 10 25 30 30 50 Time (min) Average rainfall intensity (cm/hr) 0-5 10 5-10 8 10-15 6. 15-20 20-25 3 25-30 1B: The direct runoff hydrograph is 64hr and maximum discharge is 30 m/sec. If the observed runoff due to 12hr storm of uniform intensity is 0.5 cm/hr and the catchment area is 120 km². Determine the o index for the basin in cm/hr.
- Please help, the area runoff coefficient and inlet time for each sub catchment shown in the table.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.Estimate ∅-index for a watershed having an area 5 acres. The runoff volume caused by the rainfall is 56000 ft^3. Round off your answer to the nearest whole number. Indicate the unit. Plot the hyetograph and superimpose the final ∅-index. (1 acre = 43560 ft^2) * Using the rounded-off ∅-index, estimate the volume of infiltration losses in cubic feet. *
- A 50-ha catchment has the following time-area relationship. Estimate the runoff hydrograph (cfs) using the time-area method for a 30-min rainfall hyetograph given.A 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 18 241. 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 50
- Problem 3.24 (page 119): The soil in a watershed has the following properties: 0, = 0.02, 0fe= 0.25, and 0 = 0.38. The watershed has a composite ARC II curve number of CN 80. A storm with a rainfall of 30 mm occurs in dormant season. During the five days before the storm begins, the total rainfall is 25 mm. Estimate the direct runoff from this storm using the MORE and SCS-CN models. %3D %3D %3DA catchment has four sub-areas. The annual precipitation and evaporation from each of the sub-areas are given below. Assume that there is no change in the groundwater storage on an annual basis. Compute the runoff coefficient for the Sub A. Show complete SolutionA catchment has four sub-areas. The annual precipitation and evaporation from each of thesub-areas are given below.Assume that there is no change in the ground water storage on an annual basis and calculatefor the whole catchment the values of annual averagei) Precipitationii) Evaporationiii) What are the annual runoff coefficient for the sub-areas and for the total catchmenttaken as a whole?