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East Roseland QAPP Section A Revision No . _ Date : 11 / 16/04 Page 7 of 22 A5 . Problem Definition/Background A5 . 1 Proiect Location : The 80 . 3 -acre East Roseland Watershed lies in northern Indian River County , in the community of Roseland . (see Figure A. 2 Site Location Map ) The longitude of the project site is 800E 30 ' 20 " and the latitude is 270N 50 ' 0 " . The site is located within Section 30 , Township 31 S , Range 39E . The project watershed currently drains into the St. Sebastian River which drains into the Indian River Lagoon , a state priority water body designated under the Surface Water Improvement & Management Program ( SWIM ) , a designated Estuary of National Significance , and part of the state ' s Unified Watershed Assessment Program . This estuary is also a NPS priority water body and a wintering habitat of the West Indian Manatee . Currently , this East Roseland Watershed has not implemented BMPs or stormwater treatment alternatives to reduce the stormwater runoff entering into St . Sebastian River and the Indian River Lagoon . A5 . 2 Proiect Description : The East Roseland Stormwater Improvement Project will incorporate best management practices to provide water quality treatment , reduce peak flows and flooding , and reduce the amount of pollutant loadings into the St . Sebastian River and the Indian River Lagoon . The project involves the construction of a stormwater detention lake and associated stormwater conveyance systems . The lake ' s water surface area will be about 1 . 51 acres . The project will provide flood protection and erosion control , and it will promote health benefits by reducing the amount of ponded , stagnant stormwater runoff in the area . The Project will provide a wet detention treatment system with a controlled discharge rate . The resulting lake overflow into the St. Sebastian River and ultimately into the Indian River Lagoon , a Class III , Outstanding Florida Water Body , will be improved through reduced sedimentation and nutrient uptake in the treatment lake . The stormwater lake ' s influent and effluent water quality will be monitored ( post- construction ) to determine the pollution removal effectiveness of the lake . No historical data exists for this site . Due to the ecological significance of the St. Sebastian River and the Indian River Lagoon , water quality monitoring will be an integral part of this project to determine the degree of treatment provided .