US Patent 9279242 Drain grate system and method

A drain grate system can be installed in a curbside or storm drain to block the passage of debris while allowing liquid to flow into the drain. The drain grate system can open in response to a high flow rate to allow liquid and debris to flow into the drain. A locking mechanism can maintain the drain grate system in a closed and locked position and can unlock in response to a predetermined amount of force of a fluid flow.