Read the following context and answer the question.
Context: Rainwater from the roof is collected and funneled into a 25,000 gallon underground cistern . Wastewater from showers , sinks and toilets goes into underground purifying tanks and then into the cistern . The collected water then irrigates the land surrounding the house . Surrounding flowers and shrubs native to the area enable the property to blend into the surrounding rural landscape .
Question: Why is rainwater being collected and moved into the cistern ?
Answer:


The facility is trying to be more environmentally responsible .