A 4-hour rainfall in a catchment of 250 km2 produces rainfall depths of 6.2 cm and 5.0 cm in successive 2-hour unit periods. Assuming the index of the soil to be 1.2 cm/hour, the run-off volume in ha-m will be?
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- A one-day rainfall of 15 cm at a place X was found to have a return period of 100 years. Calculate the probability that one-day rainfall of 15 cm or larger magnitude. i. Will occur once in 12 successive yearsIn a catchment area, six rainfall stations are situated as shown in the figure below. Rainfall depths (cm) in year 2016 were as follows: A=22, B=35, C=30, D=29, and E=26, P= 21. Determine the average annual precipitation using the Thiessen—polygons method.A watershed (area = 5,000 km2) was subjected to a 3-hr rainfall.
- A one-day rainfall of 20 cm at a place X was found to have a period of 100 years. a.) Calculate the probability that a one-day rainfall of magnitude equal to or larger than 20 cm will not occur at station X during the next 25 years b.) Will not occur in the next yearThe leakage from the Kaptai lake which has a surface area of 54000 acres, is between 0.1 ft/day to 2 ft/day. If the specific yield of the subsurface formation is 30%, estimate the average groundwater level rise assuming the aerial extent of the effect of the leakage is 15% of the surface area.a) Estimate the constant rate of withdrawal from a 1375 ha reservoir in a month of 30 days during which thereservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 0.5 Mm3 /day. During themonth, the average seepage loss from the reservoir was 2.5 cm, total precipitation on the reservoir was 18.5 cmand the total evaporation was 9.5 cm.
- B- The mass curve of rainfall in the storm of total duraƟon 300 minutes is given below. Draw the hyetograph of the storm at 60 minutes interval step and intensity in cm/hr.(Show by calculaƟons )Estimate the constant rate of withdrawal from a 1375 ha reservoir in a month of 30 days during which thereservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 0.5 Mm^3/day. During themonth, the average seepage loss from the reservoir was 2.5 cm, total precipitation on the reservoir was 18.5 cmand the total evaporation was 9.5 cm.Compute the average outflow from a 550 hectare river for 15 days period during which the river level dropped half a meter despite an average upstream inflow of 200000m^3/day.During the period, the total seepage loss was 2cm,the total precipitation was 15cm, the total evaporation was 4 cm. Answer must be in cm.
- A total of 10 mm of rainfall fell on a lake with a surface area of T km^2 in June 1996. Relatedthe average flow rate of the stream entering the lake per month is 12 m^3 / s, while the average flow rate of the stream leaving the lake is7m^3/s dir. Monthly evaporation height measured in an evaporation pan near the lake during this month45mm and the pan coefficient in the relevant month is 0.75 according to what is the volume of water in the lake in this monthcalculate that it has changed up to?(T=159)The average rainfall for a 3hr duration storm is 2.7cm, and the loss rate is 0.3cm/hr. The flood hydrograph has a constant base flow of 20 m3/s and produces a peak flow of 210 m3/s. Determine the peak of a 3-hr triangular Unit Hydrograph?A storm with a uniform depth of 1 in. falls on a 25-acre watershed. Determine the total volume of rainfall in acre-feet and cubic feet. If all of the water were collected in a storage basin having vertical walls and a floor area of 25,000 ft2, how deep of a basin would be needed?