Laserfiche WebLink
City of Orono <br />March 3, 1978 <br />Page 2 <br />A 24 inch CM culvert at a hydraulic slope of 2, will provide CdPilCity <br />of 20 cfs; therefore, we recr,,-,. end a 24 inch CLAP culvert in this loca- <br />tion because it will accommodate a ten year storm runoff. <br />It has been recommended to the Owner that, even though the access is a <br />private driveway, that it be furnished with an adequate bituminou.; sur- <br />face to prevent loss of base material. A modified rural section is con- <br />templated with sideslopes no steeper than 3 to 1 and shoulders at 2%. <br />Where runoff is consentrated it should be controlled with bituminous <br />swales or sod to prevent erosion. <br />At other 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 />furnished 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 />Ver truly your <br />�? Z__�7 <br />Bruce R. Kelley, P.E. <br />BRK:ja <br />Enclosure <br />cc: T')e Fawn at Long Lake <br />