1505 112TH ST SW 2018-01-02 MF Import

the overall operation and Intent of the detention vault and release structures Is anticipated to be negligible. In order to meet the requirements of 5ErA condition #10, concerning the hydrology of the wetland, an analysis has been made to establish the amount of runoff that currently flows to the wetland that will be affected by development. This analysis Included the runoff from 112th 5t. 5.W. There le no curb and gutter along 112th 5t. 5.W. As a part of this development 112th 5t. S.W. will be Improved with sidewalk, curb and gutter. Runoff from 112th St. 5.W. after development will be duetted to a new catch basin at the southwest comer of the site, thus bypassing the wetland. To establish an existing Q to the wetland, the area of 112th St. S.W. has been Included In the basin. However, to establlsh a developed Q whirh In tur- would be used to j calculate the amount of onsite detention requlred,112th St. S.W. has nct bten Included In the rv� basin. ray paving 112th St. 5.W., the amount of Impervious ndll be Increased by 4,188 square fret with an change In LN from 90 to 98. The downstream effect In Increased runoff from 112th 9t. S.W. Is anticipated to tie negligible while at the some time maintaining existing flows to the wetland. the Santa Barbara Unit Hydrograph method has been used to onsyze the wetland basin.