By Frank Vincentz (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia CommonsA trash rack is a wooden or metal structure that prevents debris from entering the intake of a water mill, hydroelectric dam or storm water system. In many cases, hydro dams pull in water from a lake, river or reservoir through their intake to be used for power generation. As the water is pumped into the system, it can carry with it a number of items such as logs, stumps, wildlife, and garbage that can be harmful to the infrastructure in the plant. The trash racks are set up to stop any debris from entering the system at the intake.
By Frank Vincentz (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons
It is also very common for plant operators to hire commercial divers to clear the trash racks. While this is an effective means of clearing out the systems, having humans swim close to any sort of underwater operating infrastructure comes with risks. If the flow of the water being pulled into the intake is strong, using a diver is not the safest option regardless of how effective they are.
In times where divers are required, the Deep Trekker ROV can be used in conjunction with the unique Diveable Control System. This allows the diver to use their judgment while below the water but keep them far enough away from any dangerous areas and use the grabber arm to clear away the debris.
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