Gauteng and NW Province

Positioning of Rainwater Tanks & Water Tank sizes

Positioning of Rainwater Tanks

One of the biggest problems with rainwater tanks is their obtrusiveness. Most estates do not allow your typical Jojo / Roto tank to be visible and unfortunately the size of the bigger round tanks has made it impractical to have them standing on a property literally outside a door or window. The perception, despite their usefulness is that they are ugly. Fortunately there are various types and colours of tanks available that are designed for small gardens / walkways / limited areas etc. The beauty of our systems is that water tanks can be placed anywhere on the property; from the highest to the lowest point, it doesn’t matter. We design a system around your needs / HOA rules and regulations.

Water Tank Sizes

The size of the tank depends on the catchment area and system demand. Typical sizes are ranged in capacity from around 750L to 10,000L, or multiples of these. The most popular sizes are 2500L and 5000 litres, which are easily handled and are not unsightly.

Smaller tanks, such as the Slimlines (between 750L – 900L) or Urban Rain’s slimmer tanks are used when space is an issue/concern. These tanks can be used for the exact same purpose than the bigger tanks; an off-the grid system or a single tank to top-up the pool / flush a toilet.

Larger tanks are commonly used where there is a desire to go as off grid as far as possible. The storage capacity is based on a whole lot of factors e.g. roof type surface (tile or metal), roof area in square metres, number of people drawing water from the rainwater tank, whether or not you have more than one of our water saving systems in place to reduce the overall consumption, and whether the house is a home, holiday home or a commercial or industrial building.

To give an example of this calculation, (completed by actuaries): a typical metal roof will deliver 1000 litres of water from 100 square metres of roof for every 11 mm of rain. To get the same volume of water from a tiled roof one would need 16 mm of rain. Each middle class person uses approx. 240 litres of water daily, so the draw from the rain tanks is very substantial. If you install two of our systems e.g. rainwater off grid and recycling grey water for irrigation you can reduce the demand for water to at worst half of the 240 litres to 120 litres per person per day, but mostly down to as little as to 80 to 100 litres per person per day. Stored rainwater can go so much further without a change in lifestyle. The value of this calculation ensures that there is enough storage so that rainwater tanks need never overflow, and that one does not overspend on too many rainwater tanks that never fill. Climate change is very real and there is no standard weather pattern anymore. We seem to shift between drought and floods at the moment. This isn’t a problem, because our systems are all modular to fit your budget and to accommodate any possible overflows etc.

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