In our Southern California- Mediterranean climate the best way to store water is in the soil. We are now building our Kitchen Garden terraces, on contour, to increase water infiltration, to conserve moisture and to mitigate erosion between terraces. Each terrace will have a shallow swale running through the middle where any runoff water will soak into the soil. The swale will become a mulched pathway, as mulching will also slow the water evaporation. It’s a classic rainwater garden recipe.