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One hydrant is known as the residual hydrant or test hydrant and is located on or near the water main where a new water connection is desired. From this test hydrant, a static pressure and a residual pressure will be measured. The other hydrant, known as the flow hydrant, is usually the nearest hydrant away from the test hydrant.
Cistern in the Mission District, San Francisco, California. The Auxiliary Water Supply System (AWSS, though often referred to on manhole covers and hydrants as HPFS for High Pressure Fire System) is a high pressure water supply network built for the city of San Francisco in response to the failure of the existing emergency water system during the 1906 earthquake.
The user (most likely a fire department) attaches a hose to the fire hydrant, then opens a valve on the hydrant to provide a powerful flow of water, on the order of 350 kilopascals (51 psi); this pressure varies according to region and depends on various factors (including the size and location of the attached water main).
Thieves have stolen about 300 fire hydrants in parts of Los Angeles County, according to the Golden State Water Co. The hydrants are sold for scrap metal.
The Golden Fire Hydrant Photograph of the Golden Fire Hydrant near Dolores Park in San Francisco, California 37°45′29″N 122°25′41″W / 37.758009°N 122.427952°W / 37.758009; -122.
The Pismo Beach Police Department posted a photo of the hydrant and warned drivers. Traffic backs up in Pismo Beach as busted fire hydrant shoots plume of water into the sky Skip to main content
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