Effluent sewer
Effluent sewers also currently serve fewer people than septic systems, which also use septic tanks, but simply dispose of the effluent by draining it into a leach field. About one quarter of United States homes dispose of their wastewater with septic tanks. However, effluent sewers are being looked at as a sewage treatment solution in areas where gravity sewer systems are not well-suited or when the high capital cost to build a gravity system is prohibitive. Areas that are less than ideal for gravity systems include areas that are large, but extremely flat and areas that require long-distance pumping, such as where homes are widely spread out or when several small villages or towns connect their sewage systems so that a centralized plant can be built.
Penrith railway station, Sydney
There is a water tank built in 1921, at the Sydney end of the station. It was built in the Newcastle PerWay Workshop and is one of 82 extant tanks in NSW but one of only three in Sydney (2009). The water tank was erected to serve the expanding traffic needs for the Penrith Station, an important locomotive service stop prior to the Blue Mountains ascent. It was part of a series of water tanks at Penrith, with smaller ones for older locomotives replaced by this tank, while other earlier ones were still used at the Loco Depot until it was phased out.