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�; • <br /> � o L�; � � 0 �1 � � <br /> � <br /> `� � Ridqeline Apartments ARR O 7 1�u° <br /> ( � � � � SEPA /113-90 <br /> � Drainage Report ������ITY�OF EVkftE� T <br /> , April 6, 1994 BIdR• Perm!t Counte� <br /> r� <br /> SITE DESCRZPTION: <br /> The proposed 24 unit apartment complex will be built on an <br /> undeveloped 1.5 acre parcel located between Casino Road and SR 526. <br /> The northerly 1/3 of the property contains a small 3,030 square <br /> foot wetland and will not be developed. Approximntely 60� of the <br /> site drains to the wetland while the remainder drains to Casino <br /> Road. <br /> STORM WATER MANAGEMENT: <br /> The eite layout contains tvo 12 unit buildings with adjacent <br /> asphalt parkinq lots with a number of carports. The carports will <br /> reduce the area of uncovered asphalt to less than 10,000 square <br /> feet so stormwater quality enhancement is not required. <br /> Stormwater from this project will be handled by three different <br /> methods. This first method is to provide storn vater detention for <br /> the runoff from the devQloped area. This area includes the <br /> carports, uncovered asphalt, landscape areas and the majority of <br /> the building roofs. The required volume was determined by the <br /> attached ^Drainage Calculation Submission Form". <br /> The second method is for the remainder of Huildinq B which will <br /> drain into the wetland. One of the conditions of epproval requlres <br /> that the development of the site not adversely affect the hydrology <br /> of the eite�s wetland. To satisfy this condition we first <br /> calculated the quantity and rate of runoff entering the vetland for <br /> current conditions. The Santa Barbara Unit Hydrography methodoloqy <br /> for 2 yeer 24 hour storm was utilized. The area that was included <br /> in this analy6ls was from the wetland buffer line south to the <br /> natural drainage divide (0.21 ac) . <br /> After development a portion of this area will still drain directly <br /> into the wetland while the remainder will drain into the on-site <br /> detention system. We ran several different areas and their <br /> correspondinq CN numbere until we had a similar quantity of roof <br /> end landscape drainage discharqing to the wetland. (see attached <br /> basin summary printout) . The area totals 0.30 acres and includes <br /> the landscape area north of the parking area anQ the north quarter <br /> of Building B. <br /> The third method is for the asphalt area under the carports. Any <br /> storm water that collects under the carports will be discharged <br /> into the sanitary sewer system. <br />