Tag Archives: Seattle

Rainwater Catchment

Greater Puget Sound Area Is Thirsty for Rainwater Collection

Sea Scouts Galveston TxThirsty for Rainwater Collection.

With more than 15 years’ designing and installing rainwater collection systems in and around Washington State, RainBank moved operations to the Seattle area four years ago to meet demand for Seattle and the Puget Sound region (and beyond… see Sea Scout Base photo above).

20150720_145650-2Experience and knowledge.

Seeing increased interest, we recognized the need for an experienced and knowledgeable designer and installer in the greater Puget Sound area.

Credentials Matter

Most counties in Washington State require an American Rainwater Catchment Systems Association Accredited (ARCSA) professional or Washington State licensed engineer with experience in water systems to design a potable rainwater catchment system. If the system requires pumping or filtration, a Washington State licensed plumber is required for installation of a rainwater collection system and is subject to permitting and inspections by the Department of Health. RainBank Rainwater Systems met this challenge long before it was required by the state legislature with ARCSA accreditation and in-house, licensed plumbers.

Steel Tanks

In the commercial market, there has been a need for competitive pricing for steel water tank sales and installation. After more than five years of commercial installations in the Seattle area, RainBank is filling that need as the Northwest Regional Dealer and certified installer of Pinnacle and Contain Water Tanks.

Rainwater collection is moving from niche to mainstream.

A full-service company offering design, consultation, cost analysis, permitting, construction, and component sales, RainBank’s experience and knowledge is unmatched in the industry.

RainBank is there for you to get the job done right the first time.

Infrastructure, Potable

Rainwater is a Safe Source of Drinking Water

gutter-pipe-54531_640We know we can effectively capture, store, and use rainwater as a safe, viable source of potable water (drinking water) in Seattle and the Pacific Northwest.

A temperate climate offers rainfall throughout the year, including a little in most summers. With low intensity and high frequency rainfall, storage volume to use ratio is close to ideal. The autumn rain returns cisterns to high levels after summer usage and winter’s increased rainfall keeps them at optimal levels. As spring arrives, cistern levels continue to be supplied by less rainfall, but enough to allow summer demands to be met. The Pacific Northwest does not witness an extended “hard freeze” in the winter months as other parts of the country, allowing storage to be unaffected by most weather conditions. Marine winds help keep our air quality above average, with limited pollutants affecting quality. The same weather systems that produce snow caps for our municipal summer supplies also comes to us as rain in lower elevations, which can be stored for immediate and future use.

Storage is calculated by annual and monthly amounts, intensity, frequency, return period, and maximum number of dry days along with catchment area and surface runoff coefficients. Use or demands are based on number of occupants, fixtures, evaporation, efficiencies, indoor and outdoor requirements. Supply and demand equilibrium is compared to determine storage capacity, surplus/deficit, and level of storage. The frequency, return period and monthly amounts in Seattle and Puget Sound region can support whole house, year round use of rainwater collection.

An average 2,250 sq ft house in the Seattle area has the potential of collecting more than 53,000 gallons of water from its roof, rather than entering the storm system and accumulating contaminants before discharging in our waterways. Residential and commercial new construction is mandated to disperse roof runoff onsite, which is a good step toward protecting our waterways. But, why not use that water for our needs? Absorption type filtration, ultra violet light disinfection along with proper design, construction, and maintenance will allow homeowners to easily become their own purveyor of their own water source.

While most municipal water supplies are safe in the US, the recent water crises in Michigan and Ohio have brought public concern of quality and safety of our centralized water supplies. Costly repairs and replacement of an aging centralized water system will be required in the next 20 years. Rainwater collection is a viable, safe source of potable water for the homeowner in many counties in Washington State and elsewhere in the US and should be considered by those who don’t.

Rainwater collection helps protect our environment, conserves energy, decreases water contamination, helps prevent flooding, erosion and sewage releases into our waterways.

Tell your local government that you would like to see rainwater collection for single-family home potable use.

Residential Rainwater Collection

Seattle Households Benefit From Rainwater Collection Year-Round

seattle-skylineWith an average annual rainfall amount of 37.5″, the Seattle area is an ideal environment for rainwater collection, since Seattle area households see a moderate climate compared to other cities in the United States.  Summers are generally short and winters are fairly moderate.

Let’s take a look at an average 2,500 sq. ft. home in Seattle, which can easily sustain itself while using rainwater collection for whole household use.

Autumn rainfall averages around 11.55″, filling tanks from the past summer’s use quickly with 17,911 gallons of water available for collection. Winter averages are around 14.42″ or the equivalent of 22,459 gallons available to keep tanks full. Spring continues with 13,036 gallons from an average of 8.37″, allowing levels to remain high. Even summer at an average of 3.15″ or 4.906 gallons available should keep tank levels from going dry to be filled again in the fall.

Seattle Precip 2015Depending on use, an average Seattle home can sustain itself on harvested rainwater without any change in lifestyle for the residents. The average demand from one occupant is 35 gallons per day or 1,050 per month – not including irrigation. Being connected to city water allows for a back up supply. Even with a small amount of storage, a supplemental system can conserve city water supplies and save money, by providing full usage during the wet periods. Future weather patterns predict wetter warmer winters and hotter, dryer summers. A look a last year’s averages on the above graph suggests this to be true. Rainwater collection is a perfect fit for Seattle residents whether non-potable or potable use is desired.