WATER/WASTEWATER STRUCTURAL STRENGTHENING
The Boone Street drainage channel periodically overflows during storm events, overtopping the recently constructed concrete channel. The earth slopes above the concrete walls were prone to erosion. The City of Olney, IL, had tried turf reinforcement mats (TRMs) placed on the steep slopes above the cast-in-place concrete channel section with little success. Grass grew non uniformly and the TRM had large wrinkles in it. Not only was the section unsightly, but it also made mowing impossible by nearby residents and did not provide the erosion protection the city wanted.
The city decided to place Concrete Cloth GCCM in a small trial area to see how it would perform. In October 2011 the first section was installed. Based upon the positive experience with the first section, the city installed more ditch lining in September 2012.
2011: Before the installation of Concrete Cloth GCCM, the area was graded smooth. The Concrete Cloth GCCM was put into a small anchor trench at the top of the slope and was tucked behind the vertical wall of the U-shaped ditch channel. At the existing culvert inlet, Concrete Cloth GCCM was capable of conforming to the complex geometry of the grouted riprap headwall. After being placed in a groove cut with a power tool, the groove was grouted with a cement grout.
2012: The trial section was still in excellent condition. The city began work on the left side of the ditch section upstream of the trial section. The trial section is farther downstream on the right side. Note, the right side will not be addressed at this time. In order to prevent floating debris from being deposited on the top of the u-shaped channel, Concrete Cloth GCCM was placed in a groove and grouted.
Concrete Cloth GCCM was successfully used to protect the upper earthen side slopes of a concrete channel from soil erosion during significant storm events, saving the city both time and expenses.
Application: Ditch Lining
Client: City of Olney, IL
Location: Olney, IL
Installation: October 2011 and September 2012