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DRAFT 4 -28 -2010 <br />12. Agricultural land preservation area(s), County Biological Survey sites, or <br />other officially designated natural resource areas. <br />13. Bankfull discharge rate of creek, stream, or river if there is a water course <br />on the site or if the site discharges directly to the water course. <br />14. Hydrologic calculations for total runoff volume and peak discharge rates <br />by subwatershed for the 2.0 -yr 24 -hour storm event, 10 -yr 24 -hour storm event, <br />and 100 -yr 24 -hour storm event or the 100 -year 10 -day snowmelt, whichever is <br />greater. <br />These shall include: <br />a. Assumed runoff curve numbers. <br />b. Time of concentration used in calculations. <br />c. Pre - existing total runoff volume and peak discharge rates. <br />d. If a flood insurance study has been done by the National Flood <br />Insurance Program, the 100 -year flood elevation with and without the <br />floodway. <br />• (h) Construction and Post - Construction Conditions; <br />• <br />1. Maps identifying areas discussed in (g)1 through (g)13 above. <br />2. Location, size, and approximate grade of proposed public sewer and water <br />mains. <br />3. Elevations, sections, profiles, and details as needed to describe all natural <br />and artificial features of the project. <br />4. Hydrologic calculations for total runoff volume and peak discharge rates <br />by subwatershed for the 2.0 -yr 24 -hour storm event, 10 -yr 24 -hour storm event, <br />and 100 -yr 24 -hour storm event or the 100 -year 10 -day snowmelt, whichever is <br />greater. <br />These shall include: <br />a. Assumed runoff curve numbers. <br />b. Time of concentration used in calculations. <br />c. Total amount of new impervious surfaces created by the project. <br />11 <br />