Using the simple method calculating the following:

a$)(5$ pts$)$ Calculate the pollutant load for total nitrogen and total coliform bacteria per year for present and developed condition for the following subwatershed.

b$)(10$ pts$)$ If local ordinance only allows the export of $250lbs$ of total nitrogen and $500$ billion total coliform colonies per year from this subwatershed, would an infiltration basin with total nitrogen removal rate of $60\%$ and total coliform removal rate of $85\%$ be sufficient?

Area $=50$ acres

Annual Rainfall, $P=45\mathrm{.}2$ inches

Present conditions: Total imperviousness $=1\%,$ Rural condition

Total coliform bacteria $=1,000$ colonies $\frac{?}{100ml}$

Developed conditions: Total imperviousness $=40\%,$ High$-$density residential homes

Total coliform bacteria $=10,000$ colonies $\frac{?}{100ml}$

Answer: a$)$

$\backslash$table$[[,$TN$,$ lbs$,$Total coliform, billions of colonies$],[$Present conditions,,$],[$Developed conditions,,$],[$Removal by infiltration basin,,$],[\backslash$table$[[$Net export $($developed$],[$condition minus removal$],[$by infiltration basin$)]],,]]$

Answer: b$)$

$\backslash$table$[[,$TN$,$ lbs$,$Total coliform, billions of colonies$],[\backslash$table$[[$Meets local ordinance?$],[($circle your answer$)]],$Yes $/$ no$,$Yes $/$ no$]]$