Problem $2$: Rational Method $(10$ pts$).$ For this problem, use the below tables from the Mile High Flood District in Problem $2\mathrm{.}1(2$ pt$).$ Using the recommended percentage imperviousness for suburban areas and assuming HSG B$,$

determine the runoff for a suburban area with $25-$year return period, drainage area of $1$ square mile, and rainfall

intensity of $2$ inches per hour.

Problem $2\mathrm{.}2(2$ pt$).$ Repeat problem $2\mathrm{.}1,$ but assuming that the surburban area has $50$ percent impervious area.

Problem $2\mathrm{.}3(3$ pt$).$ Find an internet resource that discusses the concept of low impact development. In $2-3$ sentences,

summarize the article. Provide bibliographic information for the article.

Problem $2\mathrm{.}4(3$ pt$).$ Based on what you learned in problem $2\mathrm{.}3,$ will the popularity of "low impact development" change

the assumption behind how much impervious area is in suburban areas? How might this change the amount of runoff

for a given storm?

Colorado.

Table $6-3.$ Recommended percentage imperviousness values