As a site designer, you need to calculate the volume of stormwater for a 15-acre drainage area with the following conditions.Which method will you use to accomplish the task?Storm frequency = 50 yearsRunoff coefficient = 0.35Storm duration = time of concentration = 15 minutesO OA. Rational MethodB. Modified Rational MethodC. Either Rational Method or Modified Rational MethodOD. Neither Rational Method nor Modified Rational Method One of the advantages of watershed-based stormwater management strategy over the site-by-site strategy is lowermaintenance.TrueFalse

The objective of the question is to identify the correct method for calculating the volume of…

Answered: As a site designer, you need to…

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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Similar questions

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.
The area under consideration is 250 acres of open pasture and you intend to pave 30% with reinforced concrete. You determine that the time of concentration for this area will decrease from 3 hours to 40 minutes after the ramp is in place. Currently a grass-lined drainage ditch carries the runoff for the 250 acres. For runoff coefficients, use the highest published range value in the approriate category.a) If you design for a 50-yr storm, how much will the peak runoff flow rate change? Reportthe answer as a % increase in flowrate.b) Determine if the drainage ditch will still be capable of carrying the runoff once thepaving is complete.c) What happens if the drainage ditch is paved with float finished concrete? How deep isthe flow? n = 0.025s = 1%ymax = 3 ft
Determine the following:What is Rainfall-Run off Relation?Definition of HydrographWhat is a Hydrograph Separation?What is a Unit Hydrograph?Estimation of Discharge using HydrographWhat is Rational Formula and SCS Curve?Please type it in here instead of writing it on a piece of paper
Give a detailed example of estimating rainfall using the Isohyetal Method. Include the steps and the graph.
The length of a parking lot is L = 100 m, and it is sloped at So = 0.02. The surface of the lot is bare clay with a Manning roughness factor of n = 0.020. A rainstorm produces a constant rainfall excess at the rate of ?0 = 25 mm/hr. If td = 25 minutes: Determine the runoff hydrograph at the downstream end of the parking lot. Based on your answers in Step 1, draw your estimated hydrograph. ***Convert i0 to mJs. This conversion is not given and I cannot find it.
Using the total direct runoff hydrograph given, derive a 2 hour unit hydrograph for the 2,850 acre drainage area. The rainfall duration was 2 hours and the total precipitation was 6 inches.
R The following table show the precipitation in (mm/hr.) observed at the rain gages (A, B, and C) which shown in figure belo 1. Find the average precipitation each hr. over the catchment by Thiessen method . 2. Draw a graphical relation between the average precipitation each hr. and the time. - 3. Find the (& and W- index), if the runoff volume=104.4 cm.km® thr.) 1 2 3 a 5 Rain gage A 5 | [45 [ | & 8 3 7 [35 = [ 2 % a 9 |20 | 12 | & ain gage c i 10km rain gage - ain gge 106m
Subject: irrigation engineering A) What are various water efficiencies when applied and diverted for a field of crops? b) Justify that water application to fields depend upon the soil condition?
Illustrate the Difference between event based rainfall runoff modelling and continuous rainfall runoff modelling?
Risk and reliabilityA recreational park is built near Buffalo Creek. An adjacent stream channel can carry a peak 5-year runoff of 200 m3/s, above which the park will flood. Find the following: a. The probability that the park will flood next year. b. The probability that the park will flood at least once in the next 10 years. c. The probability that the park will flood three times in the next 10 years. d. The probability that the park will flood 10 times in the next 10 years.
A small watershed has four rainfall gages located in the figure below. Total rainfallrecorded at each gage during a storm event is listed in the table. Compute the mean areal rainfallfor this storm using (a) arithmetic averaging and (b) the Thiessen method.
Rational methodAnswer the following questions referring to the Intensity-Duration-Frequency curves and runoff coefficient data below: (a) What is the return period of a storm that recorded 2.0 inches/hour for 2 hours in Houston? (b) What amount of rain (in inches) would have to fall in a 6-hour period to be considered a 10-year storm in Houston? (c) What is the return period of a storm that lasts 2 hours and records 3.5 inches of rainfall?

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