active water harvesting

Water Harvesting in the Desert Southwest

Sonoran desert rain

Rainfall is a rare and precious resource here in the desert, making it all the more valuable when it does occur. We eagerly celebrate its arrival and make every possible effort to capture and utilize this limited resource effectively. To do this, we must focus on keeping the water on-site for as long as possible, allowing it ample time to soak into the ground and replenish our land. When discussing water harvesting methods, there are generally two main approaches referred to as passive and active harvesting techniques.

Passive systems: By making simple yet strategic adjustments to the ground, a process commonly referred to as “Earthwork,” we are able to efficiently direct water along the surface toward our plantings. The approach involves slowing the water down, spreading it out over a wider area, and allowing it to soak deeply into the soil. In situations where there is a possibility of a large volume of water or even fast-moving water, we implement specialized rock stabilization techniques designed specifically to manage and control the flow. This durable stabilization material, known as rip rap, helps to significantly slow down the speed and reduce the force of the water, thereby greatly minimizing its erosive potential. This not only protects the surrounding soil but also safeguards the vegetation from damage caused by water runoff. Overall, this proven method of water harvesting is relatively low cost, highly effective, and therefore one that we consistently include as a key element in our landscape and environmental design projects.

Active systems: These are more elaborate and complex systems. They typically include cisterns or tanks, pumps, valves, pipes, and enhanced filtration components. Active systems perform effectively when they are properly maintained and when there is sufficient storage capacity available. However, the downsides of these systems include their relatively high cost, the need for frequent and sometimes costly maintenance, and the fact that they can be less aesthetically pleasing. That being said, we have developed some excellent screen ideas to help conceal these systems, and if you are interested, we would be happy to share those design solutions with you.