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• .1 <br />City of Orono <br />March 3» 1978 <br />Page 2 <br />A 24 inch CMP culvert at a hydraulic slope of 2% will provide capacity <br />of 20 cfs; therefore, we reconinend a 24 inch CMP culvert in this loca­ <br />tion because it will accoii'jnodate a ten year storm runoff. <br />It has been recoirr.ionded to the Owner that, even tiiough the access is a <br />private driveway, that it be furnished with an adequate bituminous sur­ <br />face to prevent loss of base material. A modified rural section is con <br />templated with sideslopes no steeper than ? to 1 and shoulders at 2%. <br />Where runoff is consentrated it should I ^ntrolled with bituminous <br />swales or sod to prevent erosion. <br />At Ow ..^r locations where drainage is to be directed across the drive­ <br />way, 12 inch corrugated metal pipe culverts sloped to provide a mini­ <br />mum 2 ft./sec. velocity, will be adequate. All culverts should be <br />furnisljed with apron end sections at each open end. <br />This information is to supplement the preliminary profiles and grad <br />ing plan submitted at the time of preliminary plat consideration. <br />Very truly yourg^.^ <br />Bruce R. Kelley, P.E. r <br />BRKrja <br />Enclosure <br />cc; The Farm at Long Lake