The rainfall on five successive days in a catchment were measured as 3, 8, 12, 6 and 2 cm. If the total runoff at the outlet from the catchment was 15 cm, the value of the -index (in mm/hour) is (a) 0.0 (b) 1.04 (c) 1.53 (d) Sufficient information not available
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- The rainfall on five successive days on a catchment was 2, 6, 9, 5 and 3 cm. If the o-index for the storm can be assumed to be 3 cm/day, the total direct runoff from the catchment is?The table below shows the observed rainfall intensity on a 2.26 km? catchment area. Estimate the o index if the observed runoff is 282 097 m3.A catchment area of 150km 2 received a 150 cm of rainfall in a year. At theoutlet of the catchment the flow in the stream draining the catchment wasfound to have an average rate of 2.0m 3 /s for 3 months, 3.02.0m 3 /s for 6months and 5.02.0m 3 /s for 3 months. (a) what is the runoff coefficient of thecatchment? (b) If the afforestation of the catchment reduces the runoffcoefficient to 0.50, what is the increase in the abstraction from precipitationdue to infiltration, evaporation and transpiration, for the same annual rainfallof 150 cm.
- 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.Rainfall of intensity of 20mm/h occurred over a watershed of area 100 hafor a duration of 6 h measured direct runoff volume in the stream drainingthe watershed was found to be 30,000 cubic meters. What is theprecipitation not available for runoff in this case?Average runoff from a 600 km2 catchment area was measured as 60 m3/s 3 points for a 3-hr period .If the depression storage is 10 cm and infiltration is 0.8 in what is the depth of rainfall (precipitation) in m ?
- 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.Rainfall intensity of a rural catchment is 50 mm/hr. The percentage contributions of catchment relief, catchment storage and ground characteristics in the calculation of runoff coefficient are 0, 5 and 30 respectively. What is the value of the S0-year ARI runoff coefficient (C) of this catchment? Write your answer correct to two decimal place.C- The following data which representing rainfall of isolated storm in a 500 ha watershed is as followsIf the direct runoff produced by the storm is measured at the outlet of the watershed as 340,000 m3 , estimate the ɸ-index of the storm .
- 8. A basin is divided by 1-h isochrones into four sub-areas of size 200, 250, 350 and 170 hectares from the upstream end of the outlet respectively. A rainfall event of 5-h duration with intensities of 1.7 cm/h for the first 2 h and 1.25 cm/h for the next 3 h occurs uniformly over the basin. Assuming a constant runoff coefficient of 0.5, estimate the peak rate of runoff. (An isochrone is a line on the catchment map joining points having equal time of travel of surface runoff)During a 6 hour storm, the total rainfall was recorded as 15 cm over an area of 900 km2. If the surface runoff determined from the hydrograph is 1x108 m3, calculate the phi-index.Subject: Hydrology Give me right solution Determine the 10-year period peak runoff for 80 hectare watershed having a runoff coefficient of 0.4. The maximum length of flow of water is 610 meters and the fall along this path is 6.0 meters. The rainfall intensity for that return period is 101.25 mm/hr having duration equal to the time of concentration.