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US 24 Highway Improvements at Crown C Road

Manhattan, Kansas

Surface Runoff


Pottawatomie County




Ebert Construction Co


Summer 2021

Technical Description:

  • Product: Slotted Drain™, variable height, ALT2 HEL-COR® CMP
  • Diameter: 24-inch
  • Length: 386 LF

The Public Works Department of Pottawatomie County, responsible for a wide range of projects, including roads, bridges, utilities, and subdivision development, assessed the safety of U.S. 24 Highway and determined that some improvements were necessary. Due to high traffic volumes and safety concerns, Pottawatomie County decided to construct dedicated left-hand turn lanes along U.S. 24 at Crown C Road.

The highway approaching this major intersection was on a very flat grade and ponding was an issue during any moderate rainfall event. They determined that a median surface runoff solution was necessary to address this risk.

Pottawattomie County, working in conjunction with the Kansas Department of Transportation (KDOT), considered various options to capture the runoff in the median of U.S. 24 Highway. KDOT has many design standards within their menu of items from which to select. Based on the topography of the area, geometric design considerations of the roadway, the anticipated traffic capacity and runoff quantities involved due to the large area of impervious surfaces, Slotted Drain™ was selected as the best solution. KDOT only allows CMP Slotted Drain systems for use on state highways because of the structural capacity of the installed system. Because the area is very flat the pipe invert needed to be sloped to allow the runoff in the pipe to be conveyed to one end and then discharged across the roadway. Therefore, a Contech Variable Height Slotted Drain® system was selected.

The Slotted Drain™ 24-inch diameter Aluminized Type 2 (ALT2) HEL-COR® 14 GA was manufactured in 20’ lengths and installed quickly alongside the newly constructed lane. The system was installed successfully and now efficiently removes surface water with fewer collectors and fewer laterals under the roadway, providing an effective solution at a lower installed cost.

Technical Description:

  • Product: Slotted Drain™, variable height, ALT2 HEL-COR® CMP
  • Diameter: 24-inch
  • Length: 386 LF

800-338-1122 |
Project #: 642,326

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