(a) Determine the area of the watershed to which this unit hydrograph corresponds. Report your answer in acres. (b) Assume a very intense 3-hour storm occurs shortly after a rainy period, so the ground is very saturated. The runoff from the first one-hour interval of the storm totals 0.5 in., the runoff from the second one-hour interval is 2.5 in, and the runoff from the third one-hour interval totals 1.7 in. The baseflow during and after the storm is 80 cfs. Derive the storm hydrograph for this 3-hour storm. Provide a table that clearly indicates how you used the unit hydrograph, sample calculations with sufficient explanation, explanatory sketches, and a graph of the storm hydrograph. ) Determine the peak discharge that will occur in the river if this 3-hour storm ccurs.

(a) Determine the area of the watershed to which this unit hydrograph corresponds. Report your answer in acres. (b) Assume a very intense 3-hour storm occurs shortly after a rainy period, so the ground is very saturated. The runoff from the first one-hour interval of the storm totals 0.5 in., the runoff from the second one-hour interval is 2.5 in, and the runoff from the third one-hour interval totals 1.7 in. The baseflow during and after the storm is 80 cfs. Derive the storm hydrograph for this 3-hour storm. Provide a table that clearly indicates how you used the unit hydrograph, sample calculations with sufficient explanation, explanatory sketches, and a graph of the storm hydrograph. ) Determine the peak discharge that will occur in the river if this 3-hour storm ccurs.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

435.6 flow flow 2 hr For the given 1 hour unit hydrograph and watershed Find a) Qpeak b) the isochroous X and Y in hours с) с If X=1 in and Y=1 in (this may not be the answer to part b) find the runoff hydrograph every hour (c=1) for the given storm in 2 in hr
Problem 1 The excess rainfall and direct runoff recorded for a storrm are as follows: Time (h) 2 4 6 Excess rainfall (in) 1.0 2.0 1.0 Direct runoff (cfs) 10 120 400 560 500 450 250 100 50 Calculate the one-hour unit hydrograph. 9
Given below in table Q4 are the ordinates of a 6-hr unit hydrograph for a catchment. Table Q4 Time (hr) 06 12 18 38 42 48 54 60 86 24 30 U.H 5.0 12.5 18.5 16.0 11.0 6.0 3.6 2.5 1.6 0.8 ordinate (m³/sec) (i) Calculate the ordinates of the direct runoff hydrograph due to a rainfall excess of six (-hr consecutive storms); 3.5, 2.5, 1.5 cm. (ii) Estimate the peak discharge for this event. (iii) Determine the total storm rainfall on this catchment if the catchment area is 20000 hectares and O-index is 1.0 cm/hr.
QUESTION For a 2-hour, 10 mm/h intensity rainfall, the hydrograph given in Table is observed. The area of watershed is 400 km². Table; Propeller Readings Time 0 2 4 6 8 10 12 Flow Rate (m³/s) 16 22 26 38 53 46 36 14 16 18 32 36 22 a) Obtain 2-hour unit - hydrograph for the considered flow section. 20 22 24 18 16 16
The ordinates of a six-hour unit hydrograph for a catchment area of 1000 km are given below. Time (hr.) UH Ordinates (m'/s-em) 12 200 18 30 36 15 6 24 42 80 146 80 50 The storm lasted for 18 hours. The effective rainfall increments (rainfall excess) for six-hour periods are 0.6 cm. 2 cm, and 1 cm respectively. Compute the runoff hydrograph. Also find out the peak flow and the volume of runoff.
Discharge, cuble foot par secand USGS 2 Cherry Creek is 25 ft wide and 0.6 ft deep for 500 ft upstream from the truck shown in the photo. The hydrograph shows discharge [cfs] = [ft³/s] versus time. Water temperature is 50°F. USGS 06713500 CHERRY CREEK AT DENVER, CO. 2000 i) ii) 2000 2000 Median daily statistic (8 years)Period of approved data Discharge 2008 2900 2 Ppr Part A According to the chart, what is the discharge on Sunday 4/6/2008 in [ft³/s]? Part B What is the Reynolds number for this flow, based on the depth? Part D Hint: The hydrograph has a logarithmic y-axis, which explains the uneven spacing between horizontal grid lines. At that time, what is the average velocity in the stream at the location shown? Part C 2000 2000 Imagine there is an illegal discharge adding 1 gal/min of untreated sewage 7,000 ft upstream from the location shown. Based on your answer to Part C, explain why you would (or would not) expect the sewage to be uniformly blended into the stream water at the…
QUESTION For a 2 hour, 10 mm/h intensity rainfall, the hydrograph given in Table is observed. The area of watershed is 400 km². Table; Propeller Readings Time 0 2 4 6 8 Flow Rate (m³/s) 16 22 26 10 12 14 16 18 20 38 53 46 36 32 36 22 22 24 18 16 16 a) Obtain 2 hour unit - hydrograph for the considered flow section. b) Obtain 6 hour unit - hydrograph for the considered flow section. c) Obtain the hydrograph of the rainfall with 6 hour duration and 12 mm/h intensity.
#3 E The rainfall was recorded at the network of stations over a trapezoidal watershed (see figure below). Determine and compare the average rainfall using: b) Thiessen polygon method Station ABCDEFG Precipitation (in.) 2.8 3.5 4.2 5.1 6.0 4.5 öö 3.9 85 mi 5 ml A 5 ml D 20 mi 5 mi в. 20 mi- 20 mi $5 mi 115 mi-. E 45 mi I 55 ml 45 mi 5 mi F G 5 mi 25 mi
A 100 ha watershed has the following characteristics: i. Maximum length of travel of water in the catchment = 3500 m ii. Difference in elevation between the most remote point on the catchment and the outlet = 65 m iii. Land use/cover details: (see uploaded image!!) The maximum intensity-duration-frequency relationship for the watershed is given by:3 97T0.165/(D+0.5)0.733where i = intensity in cm/h, T = Return period in years and D = duration of rainfall in hours. Estimate the 25-year peak runoff from the watershed that can be expected at the outlet of the watershed.
5. From the 1mm 6 hour unity hydrograph given below, derive the 2 hour unit hydrograph. Time 12 18 24 30 (hrs) UH 15 8 3.6 0.6 0.0 (cumecs) What would be the peak surface runoff resulting from 3mm of rainfall falling in the space of two hours?
Determine a flow equalization basin using the following diurnal flow record: Time Flow, m/s Time Flow, m'/s Midnight 0.0492 Noon 0.1033 1 0.0401 1 p.m. 0.0975 0.0345 0.0889 3 0.0296 3 0.0810 4 0.0288 4 0.0777 0.0312 0.0755 6. 0.0375 0.0740 7 0.0545 0.0700 8 0.0720 0.0688 9. 0.0886 0.0644 10 0.0972 10 0.0542 11 0.1022 11 0.0513 ,56789으=
7-Find the half-hour unit hydrograph using the excess rainfall hyetograph and direct runoff hydrograph given below Time (1/2 h) Excess rainfall (in) Direct runoff (cfs) 1 1.06 428 2 1.93 1923 1.81 5297 9131 10625 7834 3921 1846 1402 830 313 Ans: 3 4 5 6 7 8 9 10 11 n Un (cfs/in) 1 404 2 3 1079 2343 5 6 7 4 2506 1460 453 381 8 274 9 173