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Hydrology Narrative for Whitehead Addition <br />The proposed Whitehead Addition has five wetland basins lying within or partially within its <br />site. The wetland basins were delineated by Peterson Environmental Consulting. The existing <br />and proposed flow patterns for the site will remain the same. Basin E is proposed to be enlarged <br />with a NURP pond replacing a historical fill area in the basin. The proposed NURP pond will <br />treat nmoff from the proposed new cul-de-sac. <br />Basin A drains to the north under the Luce Line Trail through a 36 inch culvert. Its normal water <br />level appears to be 954.4, although the invert of the culvert is 952.9. Basins C and E drain north <br />and east overland to Basin B. Basin B drains through a ditch along the Luce Line Trail to <br />Wetland D. Wetland D has a normal water level of approximately 961 .1, although it outlets <br />through a 36 inch culvert under the Luce Line Trail at an elevation of 953.4. <br />The tributary drainage areas for the basins are as follows; <br />Basin A <br />Basin B <br />Basin C <br />Basin D <br />Basin E <br />11.07ac. <br />4.97 ac. <br />0.46 ac. <br />11.95 ac. <br />2.96 ac. <br />(Includes drainage from Basins C & E) <br />(Includes drainage from Basins B, C & E) <br />Rate control from Basin E will be maintained by the proposed 12 inch CMP under the driveway <br />for Lot 2. A baffled weir wall skim floatables prior to leaving the basin. <br />.V. is <br />54^ <br />./ u <br />7 <br />i <br />ti f An