Independently, Rachel and I both came to the conclusion that we should collect and use our rainwater.  She got the idea reading through a gardening book (the very useful and practical Week-by-Week Vegetable Gardener’s Handbook by Ron Kujawski and Jennifer Kujawski).  I came to thinking about it after flipping through a garden supply catalog (I don’t remember which one).

We often get a lot of rain here, especially in the summer when passing thunderstorms can dump several inches of rain in a very short time period.  Sustained rains are great for gardens (assuming they do not cause flooding or damage anything with the force of the falling rain) and keep the plants’ thirst quenched for several days.  Theoretically, a garden that receives an inch or rain per week (on average) does not need any other irrigation.

But during the heavy storms, most of the rain goes down the drain, soaks into the lawn or washes into the ravine.  (Or, sometimes, fills the pool with roadway material.)  Three inches of rain, delivered all at once, does not keep the garden moist for three weeks.  If we can capture some of the excess rain and use it to supply the garden’s irrigation system, we can reduce the amount of water that we draw from our well.

We could buy a turn-key kit but, fortuitously, we have two old plastic garbage cans—don’t worry; they are very clean—that would be fine as reservoirs.  To convert them, we will need some sort of adapter to connect the downspout (from a roof gutter) to the cans.  We will also need to buy pipe and fittings to connect them to each other and to the garden hose.  Our house is located uphill of the garden so it would be a gravity-fed system.  We’ll be moving the adjunct herb garden from the stoop (see February 8, 2013, part 2) and if we locate the rainwater storage there, we will get an additional eight feet of pressure head.

Now, we must consider (optimistically) that some of the time, rainwater will accumulate faster than we can use it.  This means that there should be an overflow mechanism to allow excess water to spill out when the cans get full.  It might be as simple as a hose tapped from the top of the cans to direct the water to the lawn (where it now goes all of the time).  Or, we might make it fancy and attach a sprinkler head or fountain fixture.  Either way, the trick will be to keep the water under control.

And giving due respect to Murphy (and his law), we must also consider that we will not get enough rain for it to be useful.  This means that we should be able to easily connect the garden hose to the house’s hose bib to keep the vegetables watered during dry spells (or worse, a drought).  Convenience is a key factor here because if we fail to revert to the well supply, the garden could dry out.  I will look into ways to automate this but diligence will still be required.

Collecting our rainwater is something that we ought to do, like maintaining a compost bin.  I’ll add it to my list of projects…