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How to Work out What Size Rainwater Tank You Need

12/7/2020

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When building a new facility- be it a shed, barn, or warehouse, it is crucial to determine the simplest water storage system solution. This article discusses how you can calculate the size of tank you need and how much water to collect. Here are a few aspects to help you work out what size rainwater tank you need:
 
Water Usage
 
Although every scenario is exceptional, one general rule is to have at least four weeks of water supply. For instance, if you use 1,000L every week, consider getting a 4,000L tank. Alternatively, you can calculate the number of days you do not expect rain. Then, multiply that number by your daily usage of water.
 
 
Roof Harvesting Capacity
 
You should calculate exactly how much water would flow into a tank. That means assessing the size of the catchment surface (or your roof). Bear in mind that each square metre of roof area collects one litre for every one milimetre of rainfall received. Hence, you can determine your tank size by multiplying the roof area by the typical rainfall in your region. For example, if you have a one hundred square-metre roof in an area receiving 10mm of rainfall, you will need a tank size of 1,000L.
 
 
One Large Tank versus Smaller Tanks
 
You ought to consider whether to use one giant tank or several small tanks to collect and store rainwater. For instance, if your facility has an inclined roof, you can install one huge tank at one end to collect all the water or put two smaller-sized tanks at every end of the facility.
 
Using one large tank will save space, but it might affect your water supply in case something goes wrong. Typically, having two smaller tanks means you’ll collect an equal amount of water and still have adequate supply if one of them happens to fail.
 
 
The Bottom Line
 
It is crucial to use the above factors to work out the size of the rainwater tank you need before purchasing one. Also, since each property and facility is unique, you should speak to your water tank professional to determine what suits your needs best.
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