On Thu, Aug 17, 2017 at 9:28 PM, Warin <61sundow...@gmail.com> wrote:
>> there are always exceptions. not far from me, there's a traditional >> hydrant of the type normally used with pressurized systems, but >> it's sourced from a pond. the reason is that the pond is elevated, some >> distance from the road, and they need to keep the barrel empty >> when it's not in use for the usual reasons. > > > That would officially be called and signed a 'Static Water Supply' in > Australia. A dry hydrant is a standing pipe with a coupling for a hard suction hose that is sourced from an unpressurized water source. A static water source is any source that's not under pressure, such as lakes, ponds, streams and swimming pools. In addition to requiring a hard suction hose, drafting from a natural static source generally requires floats, intake strainers, ropes and braces. Most static water sources are natural sources of standing water, and only a few are equipped with dry hydrants. There are also dry hydrants that are fed from standpipes somewhere else, by hooking up a fire pumper at the standpipe. They are often use where the protected area is higher than the municipal source can lift, or high enough to cavitate the water when pumping. Neither of these should be confused with a 'dry barrel' hydrant, where the valve is in the ground below the frost line and the riser is equipped with a drain so that it will not freeze. The case that Richard is describing is a gravity-fed dry barrel hydrant. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
