Water SystemIn regular houses water is supplied forthe day to day usage by the local authorities using pump systems and pipenetworks. The rain water is collected in the natural sources such as lakes andrivers. Collected water from these sources is pumped to treatment plants, wherewater is treated for impurities present such as silt, bacteria etc. For coldtap water the water is directly pumped to the consumers and for the hot tapwater, the water is first heated through District Heating and supplied to theconsumer 10.
From the above process for water to be supplied to consumer lotof resources like power energy, man power is used.In earthship use of these resources iscut down. It is constructed such that the need for external water system iseliminated. Water harvesting is done from the water and snow that falls on theroof. As the water collects on the roof, the sloop of the roof leads the waterto the silt filter and then into the cistern.
The water in the cisterns ispumped for using later for day to day activities 11. Number of cisterns areburied with earth outside the building along the tire walls. These cisterns arejoined together with a pipe at the bottom to make sure that level of water isequal in all cisterns 12. The earth prevents the water stored in the cisternto heat up or freeze during summer and winter respectively. The cisterns arearranged such that the top of the cistern is below the roof level do that waterflows in the cistern inlet by gravity and the cistern outlet should be abovethe earthship floor level so that it can gravity feed the pump inlet. A Water OrganizationModule is installed at the outlet of the cistern. This unit filters,pressurizes and pumps the water to the fixtures throughout the building (excepttoilet flush) and to the solar water heater mounted on the roof 7.
A Water Organisation Module (WOM) usesreverse osmosis to filter the water. The water is healthy drinkable water. WOMalso includes valves, switches and gauges to control and monitor earthship’splumbing system 13.