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��� . <br /> . Projecf Name: Orono Villas, Plat#06-3225 Client: City of Orono � <br /> � To: Tom Kellogg . . File IVos 139-06-000 <br /> � � Fram:�Lance Hoff Date: 8-16-06 . . <br /> Re: Drainage Review � � � <br /> .Summary of Recommendations � � <br /> � Based on o�:r..re�iiew of the Orono Villa� devel�pment, we offer the following comments: <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-yr 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 outiet 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 northwesf rain � <br /> garden (B.F 1). � <br />