Cost of new catchment system

[mdd7000]

It would be a whole lot cheaper to buy a tank of water once a year than to put in a water system that is that much overkill. 20k gallons? OMG! We are in lower Nanavale (350' elevation, family of 4) on a 7500 gallon tank and didn't run out when it didn't rain but 1" in an 8 week period back in January/February. Toward the end of the drought, I was guessing we still had 2 weeks of water left.