When it comes to building a water catchment system, you should consider the quality of water that you shall collect from the system. Secondly, you should ensure that you collect as much water as possible from the system for storage. The Open Permaculture School and Regenerative Leadership Institute trains on how to go about it. Here are some recommended considerations
The materials that you use to build your roofing and the water catchment system determine the quality of water that you store. It is important to ensure that the materials that you choose do not leach out toxic substances into the water. Areas that experience acidic rain have problems of chemicals being released into the water because of the rain.
You should only use materials that are approved by the Food and Drug Administration or the National Sanitation Foundation so that the water can be fit for drinking. You can use elastomeric coatings for the roofing. There are also safe epoxy coatings for use on the roofing systems.
A common type of roofing material is galvanized metal that is painted with nontoxic paint; some companies have paint that is approved for incidental contact with the water. Such paint can be used for roofing and gutter. Concrete, fiberglass, and slate can also be used in water collection roofs.
Gutters should be made of inert materials. Such materials include plastic, PVC, and seamless aluminum. Avoid such materials as copper and iron. You should also install a slight continuous downward slope toward the catchment tank. This prevents water from stagnating on the gutter and attracting animals and insects. Organic materials such as leaves also build up on the gutters affecting the taste of water and the color of water. .
Large debris will occasionally drop onto your system and cause a serious blockage. To prevent this, ensure that you place screens over the gutters. Routinely check the screens for the build-up of debris that may block the water from getting into your gutters. Some screens are arched at the middle to allow water in when the debris fill the gutter.
This is the device placed between the roof gutter and the storage tank and allows for debris and dust that accumulated between the rainfalls is diverted away from the storage tank. The initial flow of water is the most contaminated water. It contains bird and rodent droppings leaves, dust pollen and molds. A simple flush diverter can be made of a T-joint near the storage tanks to prevent the flow back of contaminated water back to the tank.