An automatically openable and closeable gate system that will find primary
use with the street curb opening to a catch basin or vault of a storm
drain system, and for other similar openings, the system having a gate
which during dry and low-flow water drainage situations will be in a
closed position such that items of trash, debris, litter, leaves and the
like will be prevented from entering the basin, vault or system, yet in
periods of heavy rainfall or other heavy water run-off situations will
automatically open to allow free flow of water into the basis or vault to
alleviate water accumulation in the adjacent street and other surrounding
areas.