cross-posted from: https://slrpnk.net/post/20107320
Source: Bon Bagay: Permaculture, Abundance and Autonomy (scroll to bottom)
Nice system. The first drain and spillway are well thought out.
Not sure about elsewhere, but here in Europe, one can often get plastic IBC containers in a metal support cage (1 x 1 x 1 m cube shaped) really cheap. It's smart to examine the labels before buying, to make sure it didn't hold anything hazardous. They come with a tap too and store 1000 L of water.
So if one practises gardening, a bigger tank might be handy to have. Elevating the ground under the tank or digging a hole under the tap will ensure better access.