Three inches of runoff produced the hydrograph below. Find the unit hydrograph. What value goes in the highlighted cell?24-hr Storm Runoff24-hr UnitTimeHydrographHydrograph(hr)(cfs)|(cfs)150300121050161260201500241800282010322700363360405100443900483138521956561650601200641188684507227076O 250 cfsO 150 cfsO 100 cfsO O cfsO 450 cfsO 200 cfsO 50 cfs

Using the concept of hydrography, we can write relation as- unit hydrograph at a particular…

Three inches of runoff produced the hydrograph below. Find the unit hydrograph. What value goes in the highlighted cell? 24-hr Storm Runoff 24-hr Unit Hydrograph (cfs) Time Hydrograph (cfs) (hr) 01 150 8. 300 12 1050 16 1260 20 1500 24 1800 28 2010 32 2700 36 3360 40 5100 44 3900 48 3138 52 1956 56 1650 60 1200 64 1188 68 450 72 270 76 O 250 cfs O 150 cfs O 100 cfs O O cfs O 450 cfs O 200 cfs O 50 cfs

Three inches of runoff produced the hydrograph below. Find the unit hydrograph. What value goes in the highlighted cell? 24-hr Storm Runoff 24-hr Unit Hydrograph (cfs) Time Hydrograph (cfs) (hr) 01 150 8. 300 12 1050 16 1260 20 1500 24 1800 28 2010 32 2700 36 3360 40 5100 44 3900 48 3138 52 1956 56 1650 60 1200 64 1188 68 450 72 270 76 O 250 cfs O 150 cfs O 100 cfs O O cfs O 450 cfs O 200 cfs O 50 cfs

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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could you explain in detail how you made the direct runoff hydrograph how the table was made
q.1What is Unit Hydrograph? Discuss Unit Hydrograph method of estimating maximum Probable Discharge.
The given table shows a unit hydrograph of 2-hour duration. Derive 6-hour unit hydrograph for the same catchment. Time (hours) 0 2 4 6 8 10 12 14 16 18 Flow (m3/sec) 0 76 105 123 123 +130 110 76 23 10 0
Route the following upstream inflow hydrograph through a downstream flood control channel using the Muskingum method. The channel reach has a proportionality coefficient of 1.25 hr and a weighting factor of 0.3 Stop routing after completing the 20-hour time step. Time (hr) 1 2 3 4 5 6 6 7 8 9 10 Inflow (cfs) 90 140 208 320 440 550 640 680 690 630 Time (hr) 11 12 13 14 15 16 17 18 19 20 Inflow (cfs) 570 470 390 360 330 250 180 130 100 90
TT DILLU b. The ordinates of the recession limb of a hydrograph are listed below. Assuming that the interflow is negligible, determine the direct runoff and base flow recession constants. Time from Time from Peak Hours Discharge m³/s Discharge m³/s peak hours 0 517 72 134 12 432 84 113 24 318 96 96 36 227 108 72 48 188 120 60 60 153 132 50
Problem 3 The table below contains the data for a one-hour unit hydrograph. Time Q (hr) (cfs/in) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 145 246 359 979 432 246 134 65 32 0 (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. table that clearly indicates how you used the unit hydrograph, sample calculations Provide a with sufficient explanation, explanatory sketches, and a graph of the storm hydrograph. (c) Determine the peak discharge that will occur in the river if this 3-hour storm occurs.
How would you go about deriving a UH from a catchment for which data (catchment area, rainfall and discharge values) are available? Derive a hyetograph from the incident rainfall (losses do not need to be considered to derive a UH); Determine the UH using the formula "Ui = Qi/P" (for a single interval hyetograph) or using "deconvolution" (for a multiple interval hyetograph). Estimate direct runoff hydrograph by subtracting baseflow from observed stream flow data; Estimate the total runoff volume and the direct runoff depth over the catchment; Determine the UH ordinates using the formula "Unit hydrograph = Direct runoff hydrograph x 1/Direct runoff depth"; Estimate catchment losses and subtract these from the incident precipitation to obtain excess rainfall; the duration of the excess rainfall is used as the duration of the UH. Determine the precipitation volume for each time interval; Use UH superposition and proportionality principles to derive a direct unit hydrograph; Estimate…
. The following are the ordinates of the 9-bour unit hydrograph for the entire catchment of the river to reservair dam site: Time (hr) o9 is 27 36 45 54 63 72 81 90 Discharge 0 69 1000 210 118 74 46 26 13 4
Rainfall depth over a watershed is monitored through six numbers of well distributed rain gauges. Gauged data are given below Rain gauge Number: Rainfall depth (mm): Area of Thiessen Polygon (× 104 m²):95 100 98 80 85 92 The Thiessen mean value (in mm, up to one decimal place) of the rainfall is 1 2 3 4 5 6 470465435525480510
Separate the baseflow from the stream flow hydrograph using the straight-line method. What is the baseflow? Calculate the direct runoff hydrograph (DRH) and plot it as an x-y scatter plot. Time (hr) Discharge (cfs) 0.0 60 0.5 54 1.0 50 1.5 90 2.0 137 2.5 176 3.0 200 3.5 198 4.0 140 4.5 97 5.0 60 5.5 40 6.0 35 6.5 32 7.0 29 7.5 24 8.0 22 8.5 20 9.0 20 9.5 19 10.0 19 10.5 18 11.0 18 11.5 18 12.0 17
6.1. Given below are the ordinates of a 4hr UH of a basin at 1hr intervals: Time (hr) 0 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 4hr-UH 04 25 44 60 70 61 52 45 38 32 27 22 18 14 11 8 6 4 (m³/s) i) What is the area of the basin? ii) Derive the 2hr and 6hr UH? Ans. i)195.84km² ii) The ordinates of 2hr UH at 1hr intervals are (0,8,50,80,70,60,52,44,38,32,26,22,18,14,10,8,6,4, 2, and 0 m³/s. The ordinates of 6hr UH at 1hr intervals are: (0,2.7,16.7,29.3,40,49.3,57.3,61.3,53.3,45.3,38.7,32.7,27.3,22.7,18,14.7,11.3,8.7,6,4,2.7,1.3,0.7 and Om³/s). 3- 00 19 20 2 1 7 21 0
%VY . Q1: A catchment area is 5 square miles and the total direct Runoff (E D. R = 11150 ft / sec). Estimate the base flow for the data shown in the table below? Time 2 3 4 5. 6. 500 500 1200 2250 2920 2670 2060 1430 Total Flow(ft/sec) 202.57 | 506.43 700.32 627.97 451.44 269.13 11 U.H 10 1100 910 Time 9 12 13 14 15 16 Total 780 650 530 510 510 500 Flow(ft'/sec) U.H 173.6 118.65 81.03 52.09 28.94 11.57 2.89 Q2: Develop a 3-hr synthetic unit hydrograph for the catchment are using Snyder's method only. If the catchment area is 400 kan?, L= 25 kam and La km, assuming C15 and C,-0.7 •,.0 |||||||||||||1||||||| إلغاء إعادة تعي ين