Which of the options below best describe the changes to stormwater runoff after an area is developed? Select all that apply O increase in peak rate of the runoff O Increase in the velocity of runoff O Increased pollution O Increase in runoff volume O increased infiltration O increased vegetated cover O Increased impermeable surfaces

Which of the options below best describe the changes to stormwater runoff after an area is developed? Select all that apply O increase in peak rate of the runoff O Increase in the velocity of runoff O Increased pollution O Increase in runoff volume O increased infiltration O increased vegetated cover O Increased impermeable surfaces

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter16: Highway Drainage

Section: Chapter Questions

Problem 8P

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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
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