The recent monsoon rains have posted a nearly uniform rainfall intensity of 30 mm/hr over a 1,500-hectare watershed area in Central Luzon. If the runoff coefficient is 0.15, what is the runoff rate in m^3/sec acre-inch/hr ft^3/sec
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The recent monsoon rains have posted a nearly uniform rainfall intensity of 30 mm/hr over a 1,500-hectare watershed area in Central Luzon. If the runoff coefficient is 0.15, what is the runoff rate in
- m^3/sec
- acre-inch/hr
- ft^3/sec
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- A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. if the phy index remains at the same value, which one of the following is the runoff due to 12 cm of rainfall in 9 hours in the catchment?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.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?
- In a year, a 120 cm of rainfall received by a watershed with an area of 140 km2. The flow in the stream draining the watershed was found to have an average rate of 2.0 m3/s for 3 months, 3.0 m3/s for 6 months and 5.0 m3/s for 3 months. a.) what is the total outflow volume within the period in m3? b.) what is the runoff coefficient of the watershed? c.) if the afforestation of the watershed reduces the runoff coefficient to 0.50, what is the increase in the abstraction from precipitation due to infiltration, evaporation and transpiration, for the same annual rainfall of 120 cm (in m3)?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.A catchment area of 150 km2 received 150 cm of rainfall in a year. At the outlet of the catchment, the flow in the stream draining the catchment was found to have an average rate of (i) 2.0 m3/s for 3 months, (ii) 3.02 m3/s for 6 months, and (iii) 5.02 m3/s for 3 months. (a) What is the runoff coefficient of the catchment? (ii) If the afforestation of the catchment reduces the runoff coefficient to 0.35, what is the increase in the abstraction from precipitation due to infiltration, evaporation and transpiration for the same annual rainfall of 150 cm? please convert in m/s
- The peak runoff in an 90 ha watershed corresponding to a rainfall intensity of 25 mm/hr and a runoff coefficient of 0.65. Find the peak runoff.In a given year, a watershed with an area of 2500 km'J received 130 cm of precipitation. The average rate of flow measured in a gage at the outlet of the watershed was 30 m3/sec. Estimate the water losses due to the combined effects of evaporation, transpiration, and infiltration due to ground water. How much runoff reached the river for the year (i n cm)?Calculate the amount of rainfall that occurred over a catchment of 200 km2 which resulted in a runoff volume of 20 m3/s. Assume that 70% of the rainfall coverts to runoff.
- 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?Table below gives the time distribution of a rainfall lasting for nine hours. If the direct runoff is 9.3 cm, determine the Ø‐index of the storm and the time of rainfall excess.A watershed having an area of 4 km2 is subjected to a rainfall event of 9 cm, thereby generating stream flow at the outlet of the watershed for 10. h. If the average stream flow rate at the outlet of the catchment is 5 m³/s, Occurring for a period of 10 h, the runoff co-efficient of the watershed for the storm is