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Uzi <br /> INTERNATIONAL <br /> ic= timm ENGINEERING <br /> SERVICES, Inc. <br /> 1904 Fawndale Drive, Raleigh, North Carolina 27612 919/848-4064 <br /> May 20, 1987 <br /> Mr . George M. Lattimore <br /> PO Boy: 1406 <br /> Hillsborough, NC 27270 ref: Lake Orange Estate <br /> Dr i dge over En.: River <br /> Dear Mr . Lattimore: <br /> Based on field data and floodway discharges information, we <br /> have completed preliminary hydraulic study on the subject bridge <br /> site. The design data are: <br /> 1 . 100-year flood discharge: 200 ,:: f <br /> 2. 25-year flood discharge: 1220( = fs <br /> 3. 100-year flood cl evat i on: 595. 7' <br /> 4. Existing road bed elevation: 594. 2' <br /> According to North Carolina Department of Transportation' s. <br /> policy, culvert under a minor secondary road, such as the subject <br /> road, shall be design for 25-year flood. Since this site locate <br /> in flood plain, the Department ' s policy required that 100-year <br /> flood shall also be considered. Therefore this preliminary study <br /> is based on the 100-year flood design. The idea is to design a <br /> box culvert that will carry design discharge for 25-year flood - <br /> and allow 100-year flood top over the roadbed. The box culvert <br /> shall be large enough that the 100-year flood elevation will not <br /> be violated. <br /> I discussed this design concept with Mr . Pet Ivey of Graham <br /> District. Office of North Carolina Department of Transportation. <br /> He indicated that the concept is acceptable. The same concept <br /> has been discussed with engineers in . NC DOT Hydraulic Unit. They <br /> also found it to be acceptable. The final design will be <br /> reviewed by NC DOT engineer when the road construction plans are <br /> submitted for approval . <br />