Rain Water Harvest - Swales

In last month's newsletter, we discussed subsoiling , and its benefits in allowing water to infiltrate deep into the soil column, beginning a virtuous cycle of improved water capacity, deeper roots, more organic matter deep in the soil, and hence more water holding capacity. This month, we'll be discussing another water-management tool, called swales . As we all know, when rain falls onto an area, it flows from regions of higher elevation, to regions of lower elevation, and this flow comes in many forms. Sheet flow is the slow movement of a sheet of water across a wide area. As it flows, some of the water infiltrates the soil, and some of the water flows away. Eventually, much of this water accumulates in natural or human-made channels that then make their way into brooks, streams, and rivers. The essential function of swales is to interrupt this flow, and prevent the water from flowing downstream. By slowing or preventing this downward flow of water across...