I'm sure I left you dangling in a previous installment with the question of how rainfall intensity affects the usability of surge tanks. I talked about rainfall intensity without actually answering the question, but we can now get to the answer that I am sure you've been waiting for.
A recent discussion on radio station KPCC asked rain barrel owners what they would do with ALL THAT WATER. The answer was that their tanks were overflowing, they were too heavy to move, and no one knew what to do with the water. They were talking as if they were going to hoard it for a hot summer day! It was a gigantic Duh moment, but they were too blinded by ALL THAT WATER - all 55 gallons of it - to take a leap to the most logical place which is to reject rain barrels and embrace surge tanks.
Meanwhile, a friend who is an actual meteorologist stopped an earlier post in this blog by to say that most 30 minute southern California rain bands could be accommodated by a surge tank. That's really the bottom line, isn't it? If you can't flow rain water directly from your gutters to some place where it will infiltrate, then it might pay to have a surge tank type of set up. Let's see if she's right with a little garden engineering.
It's also nice to make some estimates, since the possibility is that surge tanks needn't be gigantic 55 gallon drums and therefore might be more seemly in the garden.
This post is again mostly stream-of-consciousness garden engineering, which I am pretty sure has a limited appeal. It may also be wrong. Therefore you may find this analysis simple or simple-minded.