Rainwater Harvesting Systems For Irrigation

In my blog posts I often neglect to discuss rainwater collection for irrigation demands, even though the most common use of rainwater collection is for non potable use.

While my focus is often on potable whole house usage for residential systems and irrigation as a means of infiltration for commercial applications, the benefits of rainwater collection for both potable and non-potable demand have positive effects for both applications.

Irrigation demands for both commercial and residential can effectively be supplied by collected rainwater. All new construction in Washington State is required to infiltrate runoff on site. This mandate is intended to reduce runoff that increases urban flooding and pollution. Impervious surfaces, such as roads and parking lots, typically have oils, greases, and heavy metals. Yards often contain fertilizers, chemicals, and animal waste – all of which can be carried off to our streams, rivers, and lakes. Some of these are a source of drinking water in Seattle and other cities. Groundwater recharge is reduced as urban populations grow. Land development dramatically affects groundwater recharge with increased impervious surfaces. A rainwater harvesting system allows more opportunity to infiltrate the soil and recharge groundwater supplies.

roof gutter rainBy capturing roof runoff and storing it for use in irrigation, a developer can infiltrate this runoff on site and meet the requirements set forth by the city and state. Stormwater runoff is decreased; infiltration is increased, while saving costs from reduced demands on city water.

Rainwater is relatively clean as it falls on our roof. If properly collected and stored, very little filtration is needed, resulting in a clean, viable source of water for irrigation with less threat to our environment. Following conservative landscaping methods using swales, rain gardens, drought tolerant plantings, and permeable surfaces, irrigation demands can be reduced – allowing for a cost effective means of irrigation. Even more cost savings can be achieved by including toilet flushing in the rainwater system design.

Both commercial and residential developers can benefit from rainwater harvesting systems intended for irrigation. Cost savings, water quality, and environmental protection are all positive outcomes for the developer and community. Being known in the community as a business or residence that cares about our environment and its resources is often admired by customers and friends. Future generations need for us to practice conservation now to ensure safe, sustainable water sources.  Rainwater collection can be part of this commitment.

Ken Blair
A rainwater collection systems designer and consultant, Ken has designed and installed residential and commercial systems, primarily in the northwest United States for more than 10 years and, in 2014, began consulting and managing builds in other states. Ken is an accredited ARCSA Professional Designer / Installer and Life Member, the Northwest Regional ARCSA representative and advisor to its education committee and is available to speak about Rainwater Collection Systems design and builds.

Ken is a United States Navy veteran, having served on active duty during the Vietnam War era.

A career entrepreneur, Ken created a new business focus with a commercial dive company in Hawaii in the mid 1980′s to respond to and clean up oil spills, oil spill equipment training, service and maintenance for the oil co-op service industry. Ken is passionate about having a positive impact on the environment and is also a founding director of BANK-ON-RAIN (2011-2014), whose mission is to create grassroots solutions for rainwater collection for consumption and agriculture in developing areas of the planet.

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