Swales on Contour can Drought-proof Gardens, Farms and Pastures with Water Harvested Passively

"A swale is a water harvesting ditch on contour with a soft mound on the lower side, designed to slow water down to a standstill, eliminate erosion, infiltrate the surrounding area with water, and recharge the groundwater table.” Geoff Lawton "Slow it, spread it, sink it"