"[42% of] cisterns built with concrete...composed of cement, water, aggregate materials, and additives...rainwater comes into contact with pollutants [which lowers] its pH below 5.6, [thus] releasing minerals into the water [from the concrete, altering] hardness, conductivity, bicarbonates, total alkalinity, calcium, nitrates, zinc, sulfates and magnesium; which can be harmful to health...a lack of planning in the construction of the concrete tank can cause cracks [that admit] mosquitoes, representing a health risk for users suffering from vector-borne diseases such as chikungunya, zika, yellow fever."
"more than 90% of the population wash their hands more frequently (approximately six times a day) and also 85% of households were also able to use the latrine more frequently after implementing the rainwater harvesting and storage systems"
"An increase in classroom attendance was achieved due to greater availability over time and a decrease in illnesses among children and women"
In China, "seventeen provinces have adopted rainwater harvesting and storage systems since 2001 and have built more than 5.5 million tanks for drinking water and supplemental irrigation throughout China"
"Between 2007 and 2013 approximately 34% of Australian households installed a rainwater tank. The increase in tank installation is attributed to water restrictions, favorable regulations and price factors. Households outside of state capitals had the highest rate of implementation. The primary motivation for installing a rainwater harvesting and storage system was to save drinking water."
""One Million Cisterns" program in Brazil, which benefited around two million people"
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