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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- Example 7.54. On the basis of isopluvial maps, the 50 year-24 hr maximum rainfall at Bangalore is found to be 16 cm. Determine the probability of 24 hr rainfall of magnitude equal to or greater than 16 cm occurring at Bangalore: (a) at least once in 10 successive years; (b) two times in 10 successive years; and (c) once in 10 successive years.Q2: The normal annual rainfall at stations A, B, and C in a catchment are 60, 63, and 76 cm, respectively. In a year, stations A and B recorded 69 and 48 cm, respectively. Estimate the rainfall at station C in that year.On the basis of isopluvial maps, the 50 years 24 hr maximum rainfall at Bangalore is found to be 16 cm. Determine the probability of 24 hr rainfall of magnitude equal to or greater than 16 cm occurring at Bangalore. (a) atleast once in 10 successive years (b) two times in 10 successive years; and (c) once in 10 successive years
- 70 mm 90 mm 100 mm 125 mm 140 mm Isohyet area Catchment. 60 km 275 km 260 km2 8 380 km 2 215 km 40 km2 ....mm. of the catchment as shown in figure is The equivalent uniform rainfall depthEstimate 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 Rainfall Depth and the Rainfall Intensity of the given data. Show all your solution. 田 YEAR MONTH DAY RAINFALL RAINFALL RAINFALL DEPTH INTENSITY 2013 1 2013 2. 8.2 2014 1. 2014 2. -1 2015 1. 1 1.6 2015 0. 2016 1 1 -D1 2016 1 0. 2017 0. 2017 2.3 2018 1 1.3 2018 -1 2019 1 2019 2020 -1 2020 1 10.5 2. 2. 2. 21 1. 1. 1. 1. 1, 1. 1. 1. 1.
- A 1-hour UH (1 unit=1 cm) can be represented by an isosceles triangle with peak at 4 hours and peak flow of 15 m³/s. The peak of the resulting streamflow from a 1-hour rainfall of depth 2 cm will be: O 30 m3/s at 8 hours; O 30 m3/s at 4 hours 15 m3/s at 4 hours; 15 m3/s at 1 hour;A 1-h rainfall of 10 cm magnitude at a station has a return period of 50 years. Find the percentage probability that a 1–h rainfall of magnitude 10 cm or more will occur in each of two successive years.A storm with 12 cm precipitation produced a direct surface runoff of 7.2 cm in the equivalent depth unit. Assume the duration of the excess rainfall (te) is equal to the total duration of the storm for the first trial, te = 5 hr. Compute the trial value of Ø
- Recorded annual maximum 24-hour rainfall magnitudes at stations KTX are as under : YEAR RAINFALL (cm) 1960 12.0 1961 6.0 1962 4.8 1963 7.9 1964 12.0 1965 14.2 1966 13.6 1967 6.0 1968 3.7 1969 2.9 What is the return period, in years, for a 6.0 cm annual rainfall according to (i) Hazen formula; and (ii) Weibull formula respectively?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)Compute the average rainfall using the Isohyetal Method A1= 250sq.m , P1=36 10 P1 A2= 198 sq.m, P2= 49 mm (20 P2 A3= 267 sq.m, P3= 61mm P3 (30 A4= 78 sq.m, P4=19 mm