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1 The runoff from the Life and Health Fitness Center will drain d i rect I y i nto the new pond. The new residence hall runoff will drain into the existing storm sewer system, which w 11 1 be mod I f I ed to outs et i nto the proposed new pond ng fact I iiy. The pond will be designed to store the additional runoff from the two new bui I di ngs. A control led outlet with a skimming structure will be constructed to allow the runoff rate for developed area to be equal to or less than, the runoff the rate prior to development. 4 • �s�Q��11LOff��11_ EI�l�_lm�r srx�m�rt s The existing overal I drainage of th Is area 1 s not expected. to change appreciably. The r iel ds are proposed to drain In generally the same direction as they do currently. Most of the area w 11 1 drain toward the existing pond where storage and control I ed outf I ow, have been prov ided. The west portion of sl to w i I I drat n west to Rice Creek as it currently does. the The runoff rate and volume are not expected to increase. 5 • The new main entrance area Is proposed to drain as it currently does. It now drains to the low ponding 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 pert ods. Pondi ng capacity is provided In the existing pond. The other roadway iimprovements at the secondary entrance to the west will drain in the same direction and at the same rates that It currently does. Additional ponding w 11 I 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_eDD1.s_.CQyr_'§ The south half of the courts Is proposed to drain south to a smal I ponding area adjacent to the courts, sized for a 100-year storm; the north half of the courts are proposed to drain north to Arden Hills, as they do now. The storage capacity of the existing pond exceeds requirements for storage of a 100-year 24-hour storm. Existing drainage patterns have been preserved whenever possible. New ponding has been created to provide the required additional storage needed to account for the new fact I ity improvements. FI oatabI a trash removal and of I 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 PI an. AlI sediment w i I I be kept on -site during construction and will remain until temporary or permanent vegetative cover is establ Ished. Runoff outlets to the lake or Rice Creek will have rip rap and/or other approved erosion control. 1 -13- 8621