![]() ![]() Redi-Rock gravity blocks were used to replace the failing sandbags and protect the channel from erosion. The goal was to have the golf course open in April of that year, leaving only a short window for construction. To minimize disruption to the golf course's landscape and usage, the town scheduled this project to be installed in the middle of winter, starting in January 2010. The project was on a very tight schedule. The wall design ranged in height from 4 feet (1.2 meters) to 7.5 feet (2.3) meters, totaling 15,000 square feet (1,394 square meters) of Redi-Rock. To keep the volume of the channel consistent, the channel's depth in these areas was increased. The town wanted to keep the existing bridges and abutments in place so the project design called for using Redi-Rock's standard batter blocks to taper the channel along the inside of the abutments. These 9 inch (230 millimeter) setback sections terraced back from the rest of the walls to create a secondary flood plain. The majority of the project was designed using Redi-Rock 41in (1033mm) solid blocks, but engineers designed several sections of the channel using Redi-Rock's 9in (230mm) setback blocks to give the channel walls more gradual slopes. Gravity walls require less excavation, minimizing disturbances to nearby homes and infrastructure, as well as saving existing vegetation.ĭesigning the waterway to meet the 100 year flood levels was a significant factor of this project's design. Because the blocks are so massive, the Redi-Rock system can rely on gravity to hold the wall up. The blocks are composed of wet-cast concrete, which is engineered to perform well in water applications and withstand freeze-thaw cycles. Redi-Rock is an engineered precast retaining wall system that uses massive, one-ton blocks that stack up like giant Lego blocks. The results were so successful that when it was time to design the second phase, Redi-Rock was the obvious choice. Several years earlier, the first phase of this project was completed. To create an aesthetic solution while also preventing further soil erosion of the creek banks, the town turned to local Redi-Rock manufacturer Kistner Concrete Products, Inc. The lack of drainage behind the walls was causing the banks of the creek to slough off.Ĭoncrete-filled sand bags were put in place in the 1940's to hold back the earth on these creek banks. There was no drainage behind the walls at all," explained project engineer Dan Milewski with URS Corp. "The original channel walls along the creek were built in the 1940s out of sandbags filled with concrete, stacked on top of each other. Two Mile Creek runs through Sheridan Park, a par 71 public golf course that is often rated in the top public courses in western New York. When the banks of Two Mile Creek began to erode, the Town of Tonawanda, New York needed an aesthetic soil erosion solution, and they needed it on a tight schedule.
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