Monthly Archives: October 2014

Rainwater Catchment

Is Your Engineering Firm Well-Versed in Rainwater Collection Design?


Man giving a presentation to an audience in a conference room.Is your engineering firm well-versed in rainwater collection design?

With rain water collection systems becoming more accepted, many engineering firms are being asked for rainwater collection designs to meet the demand of both commercial and residential systems. But how much experience does the engineering firm have in storm water management and rainwater collection? Does the firm use consultants from the industryto help with their design? Does the firm belong to the American Rainwater Catchment Systems Association (ARCSA), or another association such as the Cascadia Green Building Council?

The members of these organizations area greatresource forengineers, architects, designers, microbiologists, contractors and suppliers who are part of theindustry and have experience that willbenefit the firm in theirdesign.There are long-timemembers of ARCSA that have brought the industry to where it is now. With their experience, a well designed, operational system will meet the intended use that the customer is looking for.

The proper design ofstorage, filtration, disinfection, and conveyanceof rainwater is essential to a system’s success. Unless the engineer has experience in rainwater collection design, many industry standards can be overlooked. The plumbing code has written standards that ARCSA helped write, along with ANSI. ARCSA accredited professionals have to meet ongoing education credits in order to stay active in their accreditation.

RainBank Rainwater Collection Systems offers consulting and seminars to bothengineers and architects and recommends to consumers that they check with their engineer or architect on their experience with rainwater collection.

Rainwater Catchment

Rainwater Collection Helps Mitigate Urban Storm Water Runoff


A vehicle emits thick white smoke while entering a building.With lessvegetation, more square footage of impervious surfaces, and more population density, cities contribute to the bulk of storm water runoff. Rethinking how we control storm water in our urban environments isessential to the health of our bodies of water. During large rainevents, a sewer system can be overwhelmed with runoff, causing intentional releases, withpollutants entering our rivers, lakes, bays, and estuaries.

The use of on site infiltration is mandatory for new construction, along with other practices such as swales along our roads rather than raised medians. Green roofs, green areas within our cities and the use of rainwater collection all have a positive impact on storm water runoff. Common sense approaches tostorm water within our cities is crucial to the health of our environment.

Rainwater collection for commercial construction and residential not only helps mitigate storm water run off, but also helps protect our water supplies by using rain water for irrigation, toilet facility, and other uses. The city of Federal Way in Washington state implemented rainwater collection for its new school maintenance facility by using rainwater for school bus wash down during the school year, and during the summer uses the collected water for irrigation.

Rainwater Catchment

Potential Unexpected Costs From GSI Mandate


A round metal grain silo in a grassy area surrounded by trees.The GSI mandate or “Green Stormwater Infrastructure” can create unexpected costs for new commercial and residential construction.Controlling stormwater through GSI compliance requires on-site infiltration and/or use.

Roof runoff, along with impervious surfaces,contributes tooverwhelmed stormwater systems, which may result in pollutants entering our waterways and wetlands. A design using both methods of rainwater collection and infiltration can be the most cost-effective, while being beneficial to the environment.

A serene garden pond surrounded by rocks and lush greenery.Directing roof runoff for irrigation, toilets, laundry, or even pre-infiltration potable water, will reduce costs frommunicipal water supplies. During the rainy season, collected water can supply these uses while overflow from the cistern can be directed to infiltration.Irrigation in the summer months being supplied by the desired amount allocated from storage will enable the rain garden or infiltration system to be sized for a smaller amount of runoff while supplementing city water usage.