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So, you live in a townhouse with a small front lawn. It never seems to get the water it needs to "keep up with the Jones who are retired and have a perfect lawn". And you have an erosion problem because your gutters collect water from all the roofs around you. Well, that is what drove me to this project.
I knew I needed to put in a "french drain" to deal with all the water coming down the spout, I also knew that I really needed an automatic sprinkler of some kind to keep the grass going through the hot periods here in Northern Virginia. Those thoughts spun in my brain until I saw this at my local home improvement store- for half price I might add!
Step 1The Parts
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This Deck Storage container was just the right size and shape to make a cistern for a small sprinkler system. I couldn't dig too deep for there were pipes in the same area- this is what kept me from doing a french drain in the first place (that and laziness). This container holds about 50 gallons of water and is made to stay outside year round. It has a lid that seals well. Perfect for making a buried rain barrel that could be the water source for a small sprinkler system.
Congratulations on solving your erosion problem. I think you'll be happiest with a drip system, if only because it is easy and low-maintenance. As an Instructables staff member, though, I say go for the Arduino/float array. :-D