ENVIRONMENTAL BENEFITS ARISING FROM RAINWATER CATCHMENT IN ELEVATED TANKS AND SIZE OPTIMIZATION FOR THE TANKS

Abstract

This research proposed a simulation of the operation of a system of rainwater harvesting ( SAALL ) for a set of five buildings of an academic institution covering an area of 8202.15 m2 and three storey (11.7 m) located northeast of Mexico City between Ticomán and Zacatenco. To estimate the volume of rainwater that can be used, was considered the use of historical data records from a weather station located in San Juan de Aragón for the period 1991-2010. We considered the use of rainwater within 16 urinals and 49 toilets that operating with flushometer with a minimum pressure equal to 98.1 kPa and for cleaning floors in set of five buildings. The savings of potable water and electricity to store the water collected in tanks to water supply in toilets could be possible by leveraging potential energy so the use of electricity and potable water is preserved. The results showed that could save 3943.38 m3/year water and 3194.35 kWh/year. We underline the importance of capturing and harnessing rainwater for expose as a viable and attractive option for local governments and private investment, proving that is possible get both environmental and economic benefits to replace the potable uses and non potables of water with rainwater.

Key Words: Elevated tanks, rainwater, rainwater harvesting potential, water balance, water demand.