This is basically the same Earthan Beds I've been building, but it's done in the ground.
Here are some pictures of how I built this water wise garden.
|The hole was dug with a trench for the 4" drain line and a sump pit at the lowest point|
|The pond liner placed with 4" perforated drain line. Notice the filter sleeve on the drain line.|
|Gravel begin spread level|
|This black shade cloth is laid on top of the gravel to keep the soil from washing down into the gravel|
|The soil has been added. This soil mix contains has enough clay that it will wick the moisture up from below|
A thick layer of mulch will be added when I plant. This garden will save rain water, and maintain moisture below the surface without loss to evaporation. There is no need to water this garden other than occasionally maintaining some water in the reservoir tank. The amount of water used will depend upon the type of crop and the heat, but it will not waste a drop.
After I install the large reservoir water tank the pump will be moved out of the sump to the larger tank. It would have been easier to have done it this way from the beginning, but I did not feel that I was up to digging a hole that size right now, and wanted to get this garden planted. Here is a diagram of how it will eventually work.