Saving Water in Southern Homes - Using Rain

Saving Water in Southern Homes – Using Rain

Saving water is an important part of the Green movement, and one good way to save water in southern homes is to use the rain.

The great thing about rain is that it’s free, and in the south it’s abundant – averaging 50-60” per year.  9 southern states rank in the top 12 for rainfall (sorry Texas, you’re 34^th) and in summer we usually get 3 ½ - 6” per month.  For most homes the only practical use for rainwater is irrigation, but the average US household uses about 25,000 gallons per year for irrigation.

The simplest way to use rain is a rainbarrel.  Be aware that the rainbarrel label tells you how many gallons the barrel holds – there is usually 7-10 gallons below the spigot that is hard to get out!  Prices start at around $60 for 50 gallon barrels, but there are larger models – some with innovative designs – for slightly more.  I like this 65 gallon model for $129.99 from hayneedle.com.

Installation is pretty simple DIY.

At the other end of the spectrum, I have designed cistern systems for new homes - and one renovation.  We collect rain from downspouts, Patio drains, condensate lines, etc. and store the water in an underground tank.  I usually find that 12-1500 gallons is enough storage, and that a septic tank works pretty well.  1” of rain on a 2000 sf roof fills the tank, and 1200 gallons is about an average week’s watering.  I put a simple cone filter on the input side with access for cleaning, and use a pump to keep adequate pressure for irrigation.  You can also collect gray water (future post) to fill it faster and more consistently, but it may then need treatment.  Cistern systems obviously cost more than rain barrels, but they payback fast – often in 3-7 years.

There are many levels of rain use between rain barrels and cistern systems with differing cost and water savings.  The design must address collection, storage and use, and whether filtering or treatment is needed.  If you have a specific idea in mind, please contact me.  I’d love to help you start using rain to save water.