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r � <br /> will be conveyed overland. An additional conveyance system(likely the previously approved � <br /> swales)will be necessary to convey the excess runoff from storms larger than 0.8" if deerned <br /> necessary by the City. <br /> • Our final concern is in regards to the longevity and maintenance of the draintile system. The <br /> draintile system is closed,with no outlet other than infiltration for water to escape. Ideally, the � <br /> potential for debris to enter the system should be minimized. The owner did a good job of <br /> � installing gutter guards to help prevent leaves from entering the system. However,the gutters <br /> discharge to the draintile system via open grates located at ground level. The open grates � <br /> introduce an opportunity for debris to enter the system. For this reason,frequent maintenance will <br /> � likely be necessary to keep the draintile system operable. The draintile system may need to . <br /> modified slightly to add cleanout points to facilitate maintenance of the system. <br /> • Note(for owner): Future drainage system designs(for any site)must be subrnitted to the City for <br /> review and approval prior to construction. While our review of this drainage system shows that it <br /> is likely adequate to mitigate the additional impervious area, a review prior to construction would <br /> be beneficial to ensure that the system is designed properly to function well and increase the <br /> � system longevity, likely saving time and money for both the owner and the City. <br /> � Y <br /> Page 2 0/1 <br />