Most public urinals incorporate a flushing system to rinse urine from the bowl of the device to prevent foul odors.

But the flushing system broke down in the 1960's as the industries were declining and the whole area was largely overlooked for decades.

Sonic Irrigation uses a combination of ultrasonic technology and a complex flushing system to ensure that all internal and external areas of complex and critical surgical instruments are cleaned.

Urinals with foot-activated flushing systems are sometimes found in high-traffic areas; these systems have a button set into the floor or a pedal on the wall at ankle height.

A flushing system connected to the opening of the washroom door can count the number of users and operate when the count reaches a certain value.

Yesterday's ceremony, replete with schoolchildren and such Brooklyn standbys as Nathan's hot dogs and Junior's cheesecake, celebrated the repairs on a flushing system installed in the canal in 1911.

"We're counting on the natural flushing system of the tide to rid the water of the bacteria," he said.

Despite his efforts, prisoners were still able to communicate with each other and the flushing system had to be redesigned several times.

Evidence of early water piping, central heating, and sanitation shows a remarkable sophistication - look for the toilet room next to the Queens chamber for evidence of a flushing system!

This is nature's own flushing system that gets the fertilizer right down to the root zone promptly.