Tanks come in all shapes, sizes, and materials. The most likely system design limitation here is going to be the cost. Any tank of any size should be installed on a stable base and have an adequate overflow.
Metal tanks – last a long time and come a wide variety of sizes and should have an internal coating or flexible liner depending on the use of the water. These can be used above or underground.
Fiberglass tanks – are very strong and lightweight; they can be used above or below ground.
Plastic tanks – are generally the most cost effective option for above ground storage and come in a range of size and colours. The tank needs to be UV resistant and opaque or covered to be protected from the sun.
Special system planning must be completed if you are planning to bury your tank. A complete site plan must be done demarcating all utilities, soil conditions, frost line, etc.
Here are some standard sized roofs and 4 different sized tanks. 200 L is the approximate size of most standard rain barrels. 1000 litres is a metric cube of water.
|Tank size (in Litres)|
|Tank size à||200||400||1000||2000|
|Roof size||Minutes to fill in a 25 mm per hour (1 inch) rainfall|
|9.3 m2 (100 ft2)||51||102||257||514|
|46.5 m2 (500 ft2)||10||21||52||103|
|92.9 m2 (1000 ft2)||5||10||26||51|
|185.8 m2 (2000 ft2)||3||5||13||26|
|Weight of water||200 kgs (441 lbs)||400 kgs (881 lbs)||1000 kgs (2204 lbs)||2000 kgs (4409 lbs)|