The rainfall in four successive 12 hours period on a catchment are 40, 80, 90 and 30 mm. If the infiltration index o for the storm is 5 mm/hour, then the total surface run off will be a) 0 b) 50 mm c) 120 mm d) 180 mm
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- A 6-hour rain of average intensity 2 cm/hour falls over the fern leaf type catchment as shown in Figurebelow. The time of concentration from the lines AA, BB, CC and DD are 1, 2, 3 and 4 hours,respectively, to the site 0 where the discharge measurements are made. The values of the runoffcoefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attain aconstant value of 0.8 after 3 hours. Draw surface runoff hydrograph from the runoff collected from thecatchment and also calculate volume of direct Runoff.The following rainfall Heights were measured at a rainfall station. Draw a hyetograph of this precipitation. Calculate the infiltration Index Φ since the flow height is 44 mm.A town covers 2000 acres with population density of 60 people/acre. Total wastewater production domestic= 125 gpcd, commercial+ industrial = 40 gpcd, and infiltration is computed at 400 gpd/acre. What are peak flows? Use tile GLUMRB peaking factor formula.
- During a two-hour storm the precipitation over a 100-acre area is 1.2 in. There is a constant infiltration at a rate of 0.4 in./hour. The depression storage is 20 acre-ft. Is there any runoff? If yes, how much? Disregard evaporation during the storm.If fo = 0.7 in./hr, fc = 0.2 in./hr, and K = 0.5 hr-1, determine the distribution of losses and the depth of rainfall excess for 2-hour storm with intensity of 1.3 in/hr.A 4-hour rain of average intensity I cm/hr. falls over the fern leaf type catchments shown in Fig. below. The time of concentration from the lines AA. BB, CC and DD are 1, 2, 3and 4 hours, respectively, to the site 0 where the discharge measurements áre made. The value of the runoff coefficient C are 0.5, 0.6, and 0.7 for the 1st, 2nd and 3rd hours of rainfall respectively and attains a constant value of 0.8 after 3 hours. Determine the discharge at site O and draw the discharge hydrograph at O?
- Given the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec. (Answer 20 cu ft/sec)Given the drainage area in above Figure calculate the discharge at the outfall using the rational method. Use the5-year rainfall intensity-duration curve Other data are: •for Area 1, C=0.50, Area = 1.3 acres, and inlet time = 7 mins; •for Area 2, C= 0.40 , area = 2.5 acres , and inlet time 5 mins•for Area 3, C=0.70, area 3.9 acres, and andinlet time = 5 mins.The sewer lines in Areas 2 and 3 are each 500 ft in length; and the average velocity of flow in the sewers may be assumed to be 3.0 ft/sec.The catchment area of a sewer is 50 hectares. Estimate the storm water flow corresponding to rainfall of 40 mm during tc of 30 min. Assume that 55% of total area is impervious.
- A total of 500 mm rainfall on 55 ha watershed of in a 12 hour period. Calculate average rainfall intensity (mm/hr). 1 ha=1000m2.Instantaneous infiltration rate can be estimated by the equation, f = 0.5(A / t0.5) + B, where ‘A’ and ‘B’ are constants and ‘t’ is the time elapsed from the beginning of the storm. Find total infiltration during 10 hours if A = 5 mm/h0.5 and B = 10 mm/h.Use TR-55 graphical method to compute the peak discharge for a 250-ac watershed, with 25-y 24-h rainfall P = 6 in., time of comecntration tc = 1.53 h, runoff curve number CN = 75, and type II rainfall