Hi, your research is so relevant to our plans to build a clinic in Sierra Leone. This community cannot afford to tie in to the municipal water source, so we've had to think sustainably on a need to get it done basis. The plan is for a rainwater collection system for the clinic, along with solar panels and batteries for the power. I am a psychologist, not a hydrologist, but your research calculations were exactly what I thought should be considered in terms of supplying water all year round. Sierra Leone gets about 112 inches of rain annually. I believe we will need 3 - 4 large water tanks to insure that the clinic has an ongoing supply of water. I'm hoping that that will be enough to sustain the health clinic throughout the year. If not, there is well water throughout the community. Any advice you could give would be most appreciated. Here's the website of the project: www.temneclinic.org
Plastic reservoirs are widely used in Brazil. However, in buildings it is common or in reservoirs made of masonry.
There are several types of materials. what is the temperature in your country. minimum and maximum.
Well,
By design, a water tank or container should do no harm to the water. Water is susceptible to a number of ambient negative influences, including bacteria, viruses, algae, changes in pH, and accumulation of minerals, accumulated gas. The contamination can come from a variety of origins including piping, tank construction materials, animal and bird feces, mineral and gas intrusion.
A correctly designed water tank works to address and mitigate these negative effects. It is imperative that water tanks be cleaned annually to preclude the delivery of algae, bacteria, and viruses to people or animals.
A safety based news article indicated that rainwater was collected and stored in a plastic tank and that the tank did nothing to mitigate the low pH. The water was then brought into homes with copper piping, the copper was released by the high acid rainwater and caused poisoning in humans.
Since the plastic tank is an inert container, it has no effect on the incoming water. Good practice would be to analyze any water source periodically and treat accordingly, in this case, the collected acid rain should be analyzed, and pH adjusted before being brought into a domestic water supply system.
Regards
The water storage tanks will be in Freetown, Sierra Leone, which receives about 112 inches of rain annually. The tanks will be used to provide water to a small health clinic (1400 sq ft), including drinking water. The temperature range in Sierra Leone is 50 - 86 degrees F.
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