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I I I I I I I I I I I I I I I I I I I The runoff fran the life and Heal th FI tness Center w I II dral n directly Into the new pond. The new residence hall runoff will drain Into the existing storm sewer system, which will be modIfIed to outlet Into the proposed new pondlng facll ity. The pond w ill be desl gned to store the add I tl ona I runoff f rom the two new bulld'ngs. A controlled outlet with a skimming structure w III be constructed to allow the runoff rate for the developed area to be equal to or less than, the runoff rate prIor to development. 4 . S.sJ~~,,11L.S~f.tDall_fl.e1.!LlmJ2r.O':l~.eD:t~ The exl stl ng overall dral nage of th I s area I s not expected to change appreciably. The fields are proposed to drain In generally the same dIrection as they do currently. Most of the area wll I drain toward the existing pond where storage and control I ed outf I ow have been prov Ided. The west portion of the site will drain west to Rice Creek as It currently does. The runoff rate and volume are not expected to Increase. 5 . .8.Q.asJw,g~_lmJ2r.Q':l~.eD:t~ The rew main entrance area Is proposed to draIn as It currently does. It now dral ns to the low pondl ng area at the southeast corner of the campus. ThIs area outlets to the existing pond near the resIdence halls only durIng moderate to high' raInfall periods. Pondlng capacIty Is provIded In the existing pond. The other roadway Improvements at the secondary entrance to the west wll I drain In the same direction and at the same rates that It currently does. AddItIonal pondlng wIll be provided on the roadways themselves due to curb and gutter Improvements. ErosIon control wIll be provIded In areas adjacent to Rice Creek. 6 . I.eDDl~_~.ur.:t~ The south hal f of the courts I s proposed to dral n south to a small pondlng area adjacent to the courts, sized for a 100-year storm; the north half of the courts are proposed to draIn north to Arden HI II s, as they do now. The storage capacIty of the exl stl ng pond exceeds requl rements for storage of a 1 DO-year 24-hour storm. Exl stl ng dral nage patterns have been preserved whenever possl bl e. New pondl ng has been created to prov I de the req ul red addl tl onal storage needed to account for the new facilIty Improvements. Floatable trash removal and oIl recovery structures are existing at the, current pond and wIll be provIded at the proposed pond. A sedIment-erosIon control plan will be provIded wIth the Stormwater Management Plan. All sedIment wIll be kept on-sIte during construct Ion and w I II ramal n untl I temporary or permanent vegetatl ve cover Is estab, I shed. Runoff outl ets to the I ake or Rice Creek w I II have rIp rap and/or other approved erosIon control. -13- 8621