H Ludi Tyler wrote:
In a hot dry area you want to plant food plants in the basin or bottom part of the swale where the water collects and reserve the berm for drought tolerant plants such as Prickly Pear. Mulch the bottom with leaves and other organic debris. If the berm needs reinforcement, you can put rocks on the downhill side of it. 
Alright thanks, how much mulch should I put on the bottom? Also do you think it would be beneficial to put potatoes on the berm. Potatoes and dought tolerant beans?