Water Efficiency Strategies
One of the biggest factor of water waste are toilets. KAS achieves water efficiency of 48% over LEED water use baseline by using dual-flush toilets that uses 2.5/4 liters per flush, urinals with Taiwan-made flushometers that uses 1.2 liter per flush, and lavatory faucets that has the flow rate of 2.9 liters per minute.
The raft foundation is made of concrete base, walls, and beam. Since it is not solid concrete, the raft foundation has internal pockets of spaces that are 90 centimeter tall. Some of these voids are used as water tank to store water needed for the fire protection system.
Rainwater collected by the elementary school roof is stored in the raft foundation. During a rain event, the rainwater harvesting helps to reduce the amount of water that has to be handled by the stormwater system in a short amount of time. The harvested rainwater is used to irrigate the trees and plants in the elementary school courtyard and thereby reducing the need to use treated city tap water.
Rainwater harvesting equipment & irrigation pump room contains filter pumps as well as irrigation pumps to use harvested rainwater to supply low-flow irrigation system installed in the elementary school courtyard. The stored water pumped from the raft foundation is filtered first before fed to the piping leading to the irrigation lines.
An irrigation system is installed in the elementary school courtyard. It can be supplied by rainwater harvested from roof drains located off building columns surrounding the elementary school courtyard. The rainwater is installed in the raft foundation.