ZB 22 13 2023 03 Drainage Statement

In existing conditions, a majority of the stormwater runoff from the area to be disturbed is conveyed via overland flow to the proposed onsite inlets which connect to the existing stormwater infrastructure within Rosney Terrace. Stormwater runoff from Rosney Terrace ultimately discharges into the existing stormwater infrastructure within Eagle Rock Avenue. The remaining stormwater runoff from the site discharges directly to the existing inlet along Eagle Rock Avenue via overland flow. As such, one point of analysis can be considered for the overall development. Stormwater runoff resulting from the proposed improvements has been designed to maintain existing drainage patterns. Six (6) additional inlets are proposed within the site to assist in collecting stormwater runoff from impervious areas, which are routed via 12” reinforced concrete pipes to the existing inlet within Rosney Terrace. Due to the reduction in impervious coverage, the volume and peak discharge runoff rates for the 2-, 10- & 100-year design storms have been reduced. As such, there shall be no adverse impacts to the properties located upstream and downstream of the site. In conclusion, the proposed project has been designed to ensure safe and efficient control of stormwater runoff in a manner that will not adversely impact the existing drainage patterns or adjacent properties. We anticipate that the subject project will not significantly impact the existing drainage infrastructure located within the existing development or the surrounding area. Orange Dev, LLC October 2022 DEC# 1021-99-025 4 Last Revised March 2023