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Orono Garage Condos – Orono, MN <br />September 18, 2024 <br />Page 4 <br /> <br /> <br />t 320.759.0764 | 219 6th Avenue East, Alexandria, MN 56308 | www.hagstromeng.com <br /> <br />B. Hydrologic and Hydraulic Criteria and Design <br />Preliminary storm frequencies analyzed for the site include the water quality control <br />volume. During the water quality event, runoff will be routed overland to areas as <br />described in Section II above. <br />For preliminary design, no analysis of larger storm events was completed as it is <br />assumed the regional facility downstream of the site will provide detention and <br />treatment for larger event stormwater runoff from the site. <br /> <br />IV. DRAINAGE FACILITY DESIGN <br /> <br />A. General Concept <br />Proposed drainage for the site will generally follow historic drainage patterns. <br />Runoff in each basin is described in Section II above. <br /> <br />B. Specific Details <br />The proposed construction will include demolition of trees and construction of five <br />garage condos, bituminous parking and drive lanes, concrete v-pans, utilities, and <br />a drainage facility. <br /> <br />Refer to the existing and proposed hardcover worksheets in the appendices. <br /> <br />V. RISK ASSESSMENT <br /> <br />In a catastrophic event, all stormwater will overtop the water quality pond and <br />drain to the south, following historic drainage patterns. The FFE of all buildings is <br />greater than 1’ above the pond overflow elevation. <br /> <br /> <br /> <br /> <br /> <br /> <br />98