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Cistern construction recommendations: this article describes the construction requirements for a site-built water storage system and includes details for diverting rooftop rainwater drainage into the cistern fdor water storage. We also describe a simple graywater re-use system installed at the same building site.
Design Details for a Traditional Water Storage Cistern, Rainwater Collection & Graywater Re-Use
In a sequence of photographs here we describe a rooftop rainwater collection system that sends clean roof runoff into a very large masonry cistern built below a home in Guanajuato, Mexico. The building owners and system designers LM and DP live atop a mountain where water is scarce and expensive to have delivered.
At below left we see a large low slope rooftop area that collects rainwater during the rainy season. Skylights, a rooftop access hatch, and a solar water heating system are also installed on this roof.
A masonry border or low parapet wall around the rooftop is penetrated at several drain locations to direct rainwater into pipes that in turn carry water to the basement cistern.
Screening (above right) keep eucaluptus leaves and other rooftop debris out of the piping. At initial rainfall water can be diverted away from the cistern so that water containing dust and bird droppings can be flushed from the roof and system before subsequent rainfall is diverted into the cistern itself.
Roof drainage is piped to a steel drum whose interior was cleaned and painted and filled with large rocks to absorb the shock of a heavy water flow into the system (below left). The catch-drum outlet then directs water through the building's wall and into the rainwater storage cistern. The designers placed the drum outlet above its bottom to permit settlement of dust and debris that can be periodically removed.
A pump located in the cistern delivers water up to the building's various plumbing fixtures. At point of use in the kitchen where safe water potability must be assured, the owners installed a water purification system including a reverse osmosis treatment and a cascade of water filters (above right).
This thoughtful rainwater catchment system in active use in a dry climate includes several interesting design features including the ability to have rain provide a rooftop dust flush before rainwater is diverted into the cistern and an extensive grayater collection system (orange arrows shown on the gray barrell at below left) that in parallel to the cistern conserves graywater for application to gardens and trees on the site.
A simple ball valve connected to the graywater container permits connection of a hose to direct graywater to where it is to be applied on nearby garden or trees.
For another very simple rainwater collection system see the rainwater collection and storage tank we show in our article at PASSIVE SOLAR HOME, LOW COST) also designed for collecting as much rainwater as possible when rainy weather occurs.
Reader Question: advice on building a traditional cistern
6/24/2014 Robert said:
I have questions regarding very much older durable cisterns. First, my Grandfather's was partially below and partially above ground and it was round, maybe 8 ft across diameter. It collected water off his galvanized tin roof and gutters that passed through some very fine screens into the cistern. I seem to recall that the liner for lack of a better word was use of something like the white very flat rectangular brick sort of like Fire Brick and probably concrete mortar but that is as much as I can recall. It was used for drinking water and just about everything. He just used a small galvanized bucket to drop and pull up the water.
The question is are there old designs of this type to be found somewhere. All I know is it worked fine and I loved the water out of it. This did not hit the ground so there was no, at that time, concern for harmful bacteria. I suspect our air was much cleaner then too. Anyway, I really want to try to find out how his may have likely been built because I would like to try building one primarily for drinking use or cooking. I also plan to have no trees near the house so no big problem with leaves. I do not recall any trees anywhere in the vicinity of his gutters or the cistern; they were all away from the house. Can you help me with some information?
Reply: Cistern Specifications & Design Tips
As we corresponded by email, cisterns are still used all over the world for water storage; in addition to keeping out debris, you may need to test (or sanitize) the water before using it for drinking.
Cisterns tend to be site-built of masonry, often open-topped or concrete-topped and may be above-ground or below ground.
Since traditional cistern construction is basically a masonry box lined with high-portland cement to improve its water tight properties, we don't find many plans or design specifications. But I can list a few features you'll want to consider besides building the cistern box itself:
Photo at left: water delivery to a stone cistern located in the floor of a restaurant in San Miguel de Allende, Guanajuato, Mexico.
Cistern wall & bottom construction: walls need to be strong enough to withstand weather, earth pressure (if below ground), and thermal movement (if in a freezing climate where you'd need to protect from frost push).
Cistern top construction: must be strong enough to be perfectly safe against collapse or against someone falling in. A cistern constructed below a driveway, for example would need to be able to withstand heavy vehicle loading as well as earth cover loading and would also be at risk of contamination if a vehicle leaks oil or fuel in the area.
Cistern location: locating a cistern where it can be filled by rainwater can be a critical consideration in dry climates where rainwater storage is essential.
Even where rainwater is not to be used to fill a cistern, if you are going to add water by delivery from a truck consider the requirement for convenient vehicle access. Traditional construction of cisterns in building basements is not my preferred design in new construction in northern climates if the cistern is going to contribute un-wanted indoor moisture to the structure.
Cistern water entry, water outlets, and drainage: we may need to include four water connections, depending on cistern design and location:
One or more water inlets to supply the cistern from a water source. Our friends David and Linn in Guanajuato cleverly designed their home's roof to collect rainwater and to direct it into a large cistern. The initial roof drainage is directed out of the cistern until dust accumulated on the roof has been washed away, then subsequent roof runoff is aimed into the cistern.
Cistern water supply to the point of use: may be by gravity for uphill or rooftop cisterns, or may require a pump system.
More about using plastic tanks for water storage incuding possible health concerns associated with storing water in some types of plastic is at PLASTIC CONTAINERS, TANKS, TYPES
Cistern Construction, Sanitation, History & Water Storage System Research Citations
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