I"m more concerned with heavy rains versus light rains. If there's a massive downpour where I live, I don't want the full volume of water sheeting off my roof going into my planter where it can wreck the soil.
A box that dumps automatically doesn't really solve my problem that I can see.
If I only wanted a certain amount of water to enter a downspout from my roof (going to a planter) at any given time, and any extra would be diverted to a secondary downspout (going to the storm drain, or yard) how would that be possible?
I was thinking that the more water flowing along a...