County Road D crosses Majoritan Creek. Farmer John Dudah has complained for year
ID: 1711003 • Letter: C
Question
County Road D crosses Majoritan Creek. Farmer John Dudah has complained for years that the 4- 84” Corrugated Metal Pipe culvert system there is undersized and threatens his house (and more importantly floods his fields). There is no headwall. You look at the drainage area for Majoritan Creek using Lidar topography and find that the drainage area above County Road 10 is 1,900 Acres, composed of 80% poor condition straight row crop agricultural (Corn and soybean), 10% ¼ Acre Residential Lots, and 10% impervious (pavement, roofs, parking lots). You check the NRCS soil maps and find the area is 40% Yapoah soil and 60% Yearian soil. You calculate the Time of Concentration to be 2.5 hours, the tailwater for the 10-year and 50 year events to be 5.2 and 6.8 feet, respectively. The pipes are currently 80 feet long and are at a 1% slope. The edge of pavement is 15 feet above the invert elevation on the upstream side of the pipes. Mr. Dudah’s house first floor elevation is 22 feet above the invert elevation on the upstream side of the house. Is the culvert system undersized given ODOT standards?
Explanation / Answer
Answer is no becoz 80 percent of culvert area is in poor condition and chances of floods is very high.Oklahoma department of transportation says in code of roadway construction and according to article R26 to R30 it does not meet ODOT STANDARD