Since your team is doing such an outstanding job for your client, they requested a preliminary evaluation to estimate flow under the highway considering the implementation of amasterplan for the entire watershed that drains to the roadway. Your team developed the unit hydrograph below for a 1 hour storm duration.Calculate the watershed response to the hyetograph provided and provide the total peak flow (cfs).Table 1. Effective PrecipitationTimeP[hr][in.]12.020.5Table 2. Unit HydrographTime[hr]Ошн[cfs]00140021600380040

Answered: Since your team is doing such an…

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter16: Highway Drainage

Section: Chapter Questions

Problem 9P

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Problem-1 A watershed is divided into sections as shown below. Runoff from each section will contribute to flow at gauge G as indicated in the table. For an excess rainfall intensity of 0.5 in/hr falling uniformly for 5 hrs, determine the resulting direct runoff hydrograph (DRO). D A C D Area [ac] 150 250 350 200 Time to G [hr] 2 4 G
The table below shows the observed rainfall intensity on a 2.26 km2 catchment area. Estimate the o index if the observed runoff is 282 097 m³. Time (hr) Rainfall (mm/hr) O to 2 35.6 2 to 5 58.4 5 to 7 27.9 7 to 10 17.8 10 to 12 7.6 O 25 mm/hr O 29 mm/hr O 27 mm/hr None of the choices O 23 mm/hr
A 3-hour rainfall occurred at some part of IIUM Gombak Campus, over a catchment area of 160 ha. The rainfall distribution and other relevant data is given in Table 1. Calculate the runoff volume generated due to that storm event. Table 1: Data for Question 1(b) % of catchment 9-index (cm/h) Rainfall (cm) area 1st hour 2nd hour 3rd hour 20 1.00 0.8 2.3 1.5 30 0.75 0.7 2.1 2.5 1.0 50 0.50 1.0 0.8
A rainfall hyetograph is provided for a 6-hour storm event, which occurred over a watershed with an area of 2100-acres (Ac). If the Phi-index is 0.71 in/hr, calculate the volume of runoff (VRO) from the storm (in Ac-ft). Report your answer to the nearest tenths (0.1) place. HINT...the answer should be around the 500-1,500 Ac-ft range (yes, it is a big range if you need to guess). Intensity (in/hr) 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 Time (hr) 5 6 7 2
Runoff data have been collected for a 4-hour storm over a 120 acre watershed as indicated in the table. If the total volume of water infiltrated during the storm was 3.0 Ac-ft and the Phi Index is 0.1 in/hr, sketch the rainfall hyetograph with EVERYTHING labeled appropriately. Also, report the depth and volume of precipitation (in inches and Ac-ft, respectively) for each 1-hour period.
Discuss Four (4) negative and Four (4) positive impacts of flooding on the environment.
After a 2-hour storm, a station downstream from a 40 square mile drainage basin measures 9300 cfs as a peak discharge and 3400 acre-feet as total runoff. Find the 2-hour unit hydrograph peak discharge.
3. What is the probability of occurrence of a storm that has a return period or recurrence interval of 50 years. 4. A 4-hr storm rains on a 100 km² drainage watershed. The surface runoff data from a gaging station draining the watershed are given below: Time (hr) 0 2 4 6 8 10 12 14 16 18 20 22 Direct Runoff, Q (m³/s) 0 0 200 600 900 700 500 300 200 100 0 0 (a) Construct the unit hydrograph for the 4-hour storm. (b) Find the runoff rate at t = 10 hr from a three-storm system: The first storm has an average depth of 6 cm starting at t = 0 hr. The second storm has an average depth of 14 cm starting at t = 4 hr. The third storm has an average depth of 8 cm starting at t = 6 hr.
What is the peak flow from a watershed with 2 acres and runoff coefficient of 0.8, for a 25-year return storm over 30 min period using the Rational Method? (Use the IDF for Washington, DC)
02: Table below shows a rainfall data gathered from a storm occurred on a watershed area 2851 km² with direct runoff 856 m³/sec. Determine the W and index for this area and check the validity of your solution. Time (hrs) Rainfall 14.3 8.0 7.2 3.8 2.0 (mm) 1 2 3 4 5 6 7 8 1.3 1.0 0.0 9 0.8 10 11 12 13 0.0 13.9 17.2 2.0 14 15 0.9 1.5
The following table displays the recorded flow rates for a net rain of 1.92 inches that occurred over an exam watershed during a 12 hours rainstorm. (a) Determine an appropriate UH for the watershed, (b) obtain a 6-hr UH (1") for the exam watershed, and (c) determine the streamflow hydrograph of the exam watershed for a 24- hr rainstorm having 6-hr blocks of uniform net rain of 1, 2, 3, and 1 inch. Specify the magnitude and time of occurrence of the peak flow. Time (hrs) Observed streamflow (cfs) 0 4 6 8 12 18 24 30 36 42 48 54 60 12 8 4 24 34 44 34 24 18
Read the question carefully and give me right solution according to the question. A watershed received 68 mm of rain on 1 day. It has open spaces with 60% grass cover and Group A soil. Previous to this event, the watershed had received 34 mm rainfall in the past 5 days. Compute the direct runoff by using the SCS method.

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