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� , <br /> } Nlemo <br /> Project Name: Orono Villas, Plat#06-3225 Client: City of Orono <br /> To:Tom Kellogg File No: 139-06-000 <br /> From: Lance Hoff Date: 8-16-06 <br /> Re: Drainage Review <br /> Summary of Recommendations <br /> B�sed on o�;r.re��iew of the Orono Villas development, we offer�the fo(lowing comments: <br /> t <br /> 1. The proposed site meets existing flow rates for the 2-yr, 10-yr, and 100-yr, 24 hour <br /> storm events. The table below summarizes our modeling results. , <br /> Condition Storm Return Period <br /> 2-yr 10- r 100-yr <br /> Existing 1.3 4.7 10.4 <br /> Proposed 1.3 4.2 � � 8.2 - <br /> 2. The proposed pond has sufficient wet volume to treat runoff from the 2.5", 24 hour <br /> storm. <br /> 3. A spot elevation or contour for the pond top of berm should be shown on the grading <br /> plan. The pond should provide flood storage up to an elevation of 959.5 as shown in the <br /> developer's submitted model. <br /> 3. A pond outlet detail should be provided. The pond outlet should provide skimming up to <br /> the 10-yr event. Low flow control is not necessary for this site. <br /> 4. The pond EOF elevation and location should be shown on the grading plan. The pond <br /> EOF should be located at or above the 100-yr HWL. <br /> 5. 2' of freeboard should be maintained for the townhome adjacent the northwest rain <br /> garden (B.F 1). � <br /> Bonestroo, Rosene, Anderlik and Associafes, Inc: <br />