2-A 3 hours storm produces a flood hydrograph as: t (hr) Q (m³/s) 12 15 18 21 20 16 20 10 Determine 3 hr-UH, if the catchment area is 50 km². 0 3 4 9 6 12 9 18 24 27 8 6 30 4
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- Q4-The stream flows due to three successive storms of 2.9, 4.9 and 3.9 cm of 6 hours duration each on a basin are given below. The area of the basin is 118.8 km². Derive a 6-hour unit hydrograph for the basin. An average storm loss of 0.15 cm/hr can be assumed. Time (hr) 0 Flow (cumec) 20 3 50 6 92 9 140 12 199 15 202 18 204 21 24 84.5 27 30 33 45.5 29 20Example -2 Using the given 6-h unit hydrograph derive the flood hydrograph due to the storm given below, UH: Time (h) 6-h UH ordinates (m³/s) 0 20 60 150 120 90 66 Storm: 0 6 12 18 24 30 36 42 48 54 60 66 Time from beginning of the storm (h) 0 Accumulated rainfall (cm) 0 50 32 20 10 0 6 12 18 4 5 10 The index for the storm can be assumed to be 0.167 cm/h. Assume the base flow to be 20 m³/s constant throughout.9:.0 The peak of a DRH is 30 m3/sec for a rainfall depth of 10 cm. The peak discharge of a 6hr UH is * 10 m3/sec 12 m3/sec 6 m3/sec 30 m3/sec 3 m3/sec Find the 50 years flood for the following 10 years flood data using Gumble Distribution, then find the following * Year 2010 2011 2012 2013 2015 2016 2017 2018 2019 2020 a m3/sec 18 30 47 55 28 15 25 <0.05 0.06-1 1.1-10 20-25 mean, m3/s standard
- N S (b) The hydrograph resulting from an 8-hr storm over a catchment area of 4000 km² is given in the table below. Derive and plot the unit hydrograph for this storm. Time hrs Discharge (m³/s) 0 6 12 18 24 30 36 42 48 54 60 120 140 480 1980 2600 2500 1500 1100 540 450 400 Baseflow (m/s) 120 140 160 180 210 220 280 295 360 380 400 → 00 5 2NH.W a a -A 3 hours storm produces a flood hydrograph as: t (hr) Q (m'/s) |0 3 6 4 9 12 |9 12 15 18 21 24 27 6. 30 18 20 16 20 10 8. 4 Determine 3 hr-UH , if the catchment area is 50 km? . b-Find the flood hydrograph of 3 hrs storm (use the UH of a ). Total precipitation is 14.5 cm and -index is 1cm/hr. C- Find the total hydrograph of 2 hrs and 5 hrs successive storms of 1.5 and 2.4 cm excess rainfall. Base flow is 5 m/s and use 3 hrs U.H. of a.A catch basin was simultaneously 4cm, 5 cm and 3cm, respectively hit by 3 storms with 4hr interval, each has been recorded to index is 0.5 cm/hr, and base flow is 10 cu.m/s Complete the table: UH ORDINANCE OF DRH 0 0 2 16 4 22 6 43 8 64 10 49 12 32 14 20 16 0 What is the peak flow of the hydrograph? TIME
- Question No. 22 The ordinates of a 2-h unit hydrograph at I hour intervals starting from time t = 0, are 0, 3, 8, 6, 3, 2 and 0m³/s. Use trapezoidal rule for numerical integration, if required. A storm of 6.6 cm occurs uniformly over the catchment in 3 hours. If o -index is equal to 2 mm/h and base flow is 5 m³/s, what is the peak flow due to the storm?A watershed of (30+X) km2 was subjected to a storm of 2-h duration from which the following information are recorded in Tablea) Obtain a Unit Hydrograph for this watershed knowing that the base flow in the stream is estimated at 2 m3/s. b) Derive and plot 6-h Unit Hydrograph for the catchment area.Time (hours) 0 1 2 3 4 5 6 7 8Discharge (m3/s) 2 15 30 37 30 22 16 12 26 The ordinates of a 6-h unit hydrograph are as given below: Time (b) 6-h UH 12 18 24 30 36 42 48 54 60 75 25 50 100 87.5 75 62.5 50 37.5 25 72 66 72 78 12.5 0 0 ordinates (m3/s) Calculate the resulting hydrograph (flood hydrograph) due to storm of rainfall excess of 2 cm during the first 6 hours and 4 cm during the second 6 hours interval. The base flow can be assumed to be 25 m³/s constant throughout.
- CVNG2011 Engineering Hydrology Tutorial: UH and Flow Routing Question 3 (July 2019) The 1-hour unit hydrograph for the St. Joseph watershed at Acono is given in Table 3.1. (One unit is 1 cm.) Table 3.1 Time (h) 1 2 3 4 6. 7 8 Unit Hydrograph (m³/s) 1.8 30 86 42 15 5.5 1.8 A raingauge recorded a major storm within the catchment as having a depth of 4 cm in the first 2 hours and 5 cm in the second 2 hours. The abstraction rate is 0.34 cm/h and the baseflow is 50 m/s. a. Use the 1-hour unit hydrograph to develop the 2-hour unit hydrograph. b. What is the peak flow resulting from the storm? c. At what time did this peak flow occur?Example 4. Following are the ordinates of a storm hydrograph of a river draining a catchment area of 423 km² due to a 6-h isolated storm. Derive the ordinates o f a 6-h unit hydrograph for the catchment Time from start of storm (h) -6 0 6 12 18 24 30 36 42 48 Discharge (m³/s) 10 10 30 87.5 115.5 102.5 85.0 71.0 59.0 47.5 Time from start of storm (h) 54 60 66 72 78 84 90 96 102 Discharge (m³/s) 39.0 31.5 26.0 21.5 17.5 15.0 12.5 12.0 12.0Ron vel. CP= Precip Vol Department of Civil Engineering Engineering Hydrology - CCB 433 Tutorial No.2 October 2022 In a given year, a catchment with an area of 2500 km² received 1.3 m of precipitation. The average rate of flow measured in a river draining the catchment was 30 m³s¹. 24xboxbox 3012х12х30=2 ³)? > (ii) What is the runoff coefficient? (iii) How much water is lost due to the combined effects of evaporation, transpiration, and 11x2500 × 106 = infiltration? (Expressed in m). P-R- [1₂ +ET] =AS