Tag Archives: rain water harvesting

Spring WATER workshops at Eco-Sense

SORRY!  Workshops POSTPONED until later in the year
Three NEW WATER workshops at Eco-Sense now posted for Feb-March 2019:

03c3a8_9e33325d05fb4751beb4d8f1f401acda~mv2Essential Composting ToiletsPOSTPONED
Responsible Water AlternativesPOSTPONED
Rain Water HarvestingPOSTPONED

Eco-Sense Eventbrite page is here.  Click on any link to register online.


Outside view of the MUD room @ Eco-Sense classroom

All workshops are small with only 12 people and are held in the MUD Room.  High quality screen for presentation.  See photos of MUD room here.

Also included in $90 course fee:

  • Short tour of the homestead – weather permitting.
  • Organic home made LUNCH with vegetarian and local meat options. Coffee and tea and lemon water (yes our own lemons).
Design Example Drawing

In ground concrete tanks

About Gord:

  • Co-Author of the book “Essential Composting Toilets” published by New Society Publishers in Oct 2018
  • Technical editor for the Manual of Composting Toilets and Greywater Practice for the province of BC
  • Accredited Professional with the American Rain Catchment Systems Association (ARCSA)
  • Co-creator/builder of the award-winning Eco-Sense home; awarded Living Building Challenge petal recognition in 2010.
  • Councillor District of Highlands 2014-present
  • Sits as a Water commissiosoner on both the Juan de Fuca and CRD water commissions

Cover Image emailed

HOW to Buy our book:

  1. Buy this book dirrectly from the publisher using this link, and we will get a small commission.
  2. Buy from us at our workshops or speaking engagements (note that we do not ship our books)
  3. Buy from your local bookstore
  4. Buy online from Amazon

Inside the classroom with BIG screen TV for quality presentations.  Maximum group size of 12.



Affordable, Sustainable Homes: Eco-Sense and the Future of Green Building

Here is link to the Cascadia report on Eco-Sense.  One year Research Project funded by a grant from Vancity and the Real Estate Foundation.  Gord and Ann have over 425 hours into this…250 of which was volunteer…we missed our summer.

Affordable, Sustainable Homes: Eco-Sense and the Future of Green Building  (Written for the public.)

Also a link to the Technical Report  which served as the basis for the Cascadia report.  Written by Gord Baird, Christina Goodvin of Goodvin Desgins, and Ann Baird.  Lots of graphs, tables, and building science analysis for the earthen walls in four seasons (temperature, humidity, dew point),  full technical analysis of sustainable energy systems (solar PV, Solar Thermal, wood gassification), full policy report, full water analysis (grey water, rain water harvesting, composting toilets, water balance tables, and more).

See research page on blog  for all the individual reports (water, solar PV, building code, wall performance, and energy comparison reports)

Highlands Sustainability Task Force Report

Highlands Sustainability Task Force

42 recommendations submitted to Highlands council.  Read section on green building for policy on “Flush toilet ready” and “net zero zones”.  Lots of great stuff in this report.

Arcade Journal – Rainwater Collection


A Simple Path to Responsible Water Use
(excerpt from Arcade Journal – Winter 2009 – guest editor Jason F.McLennan)

Ann and Gord Baird

Incorporating biomimicry into environmental design, whether commercial or residential, combines beauty, simplicity and function into responsible use. With that said, the natural world abounds with examples of simple rainwater harvesting. Lakes, ponds, wetlands and groundwater are excellent large-scale, natural examples of rainwater harvesting, while upturned leaves holding droplets serve as micro examples. Architectural expressions of natural systems for capturing and conveying the rain that falls on our sites can be inspiring and add significant meaning to any design. Storing rainwater for future use is a natural, life-supporting process that has been absent for much too long in modern building design.

However, times are changing, and we are increasingly cognizant of our abuses of the world’s water. By installing rainwater harvesting systems, the water that is industrially treated is reduced, contributing to individual and community water security and maintaining balance in the natural water cycles of surrounding ecosystems. The impacts of rainwater collection — a simple process — can be profound.

Rainwater can easily be used for many purposes including irrigation, flushing toilets (which accounts for 30% of indoor water use), mechanical systems, cleaning needs and even potable drinking water, but conservation should always be considered first so that water requirements are reduced.

A Guide to Rainwater Harvesting

A basic system collects rainfall from the roof, filters out debris and then stores it in cisterns; storing clean water results in less tank maintenance down the road. The stored water can then be drawn upon and filtered further as required depending upon the use. It is critical to match the appropriate quality of water to its intended use.

Roof materials, gutters and slope all have their pros and cons. Metal, clay tiles and slate are great, but better yet, consider a living roof, which among many other benefits also acts as a mini-watershed for primary filtration. A living roof also has built-in drainage layers, thus reducing or eliminating the need for exterior gutters.

A first flush diverter is required to discard the first seasonal rain that falls on a non-living roof to clean-up the pollen, bird poo, needles and leaves. There is usually a secondary simple filter (screen) for leaves and other sedimentary materials.

Tanks are literally a big topic, and their size is determined by three factors: roof size, monthly/annual rainfall and monthly/seasonal usage. Cisterns can be concrete with a sealer or membrane, wooden, metal with a membrane, HDPE plastic tanks, ponds or wetlands. Ideally, as with any system, it is important to incorporate biomimicry and consider all the household systems when designing. For example, a large, concrete cistern can be incorporated in the foundation of a home, simultaneously adding a temperature moderating thermal mass, providing a possible dump for solar thermal heat and a water reservoir for fire protection. Your climate, site, budget, other systems and environmental leanings will determine your choice.

Stored water can be used for potable or other uses; non-potable usage does not require any further filtering before it is used but should be marked as “not potable.”

Potable water needs to be filtered or sterilized to meet local code requirements. Usually rainwater will be filtered down to five microns before sterilization. Possible filters include sand, ceramic and disposable. Once adequately filtered, the water can be sterilized to kill any potential pathogenic bacteria via a UV sterilizer, a chemical sterilizer (such as bleach) or a membrane osmosis system; the choice depends on many factors, such as regulations and energy requirements.

What about code? Since policy can be lacking in many jurisdictions, common sense dictates having your water lab tested for potability. (For more on water regulation, please see Ben Gates’s article “Taking the Guerilla Out of Greywater” later in this issue .)

If energy conservation is vital when processing rainwater (as it is at our home), use mother nature’s pumps (gravity) wherever possible and then only special energy efficient pumps. Pump choice is based upon the desired pressure, the amount of head it has to travel (distance straight up) and the volume of flow.

Take for example our vegetable garden’s drip irrigation system. We have a 2,500 square-foot living roof that collects 1,300 gallons for every inch of rainfall; 1″ of rain on one square-foot of roof area produces 0.52 imperial gallons. Precipitation occurs during winter, so we store enough rainwater for four to six months of summer drought. Our storage capacity of 10,000 gallons consists of four tanks, all gravity fed to overflow to the next, thus eliminating our need for a separate stormwater system. Our domestic potable water comes from a deep well, and we utilize a no-flush toilet and low-flow fixtures to reduce our domestic water use. The rainwater system is designed for possible future upgrade to potable quality by installation of a sand filter between the living roof and the storage tanks and then through a five-micron ceramic-filter and UV sterilizer.

Larger scale examples consist of basically the same steps. Keeping systems simple and fully integrated into the building design is the key to water sustainability.

Nature can be our friend or our enemy. If we design with the natural environment, rainy, grey days are sources of joy and renewal, as we watch our vessels fill with the most precious of all resources: water.

For more information


Books to read

Rain Water Collection for the Mechanically Challenged, by Suzy Banks
Rain Water Harvesting for Drylands and Beyond, by Brad Lancaster

Ann and Gord Baird walk the talk of sustainable living in their newly completed (Dec 08), multi-generational, Eco-Sense home that is registered for the Living Building Challenge. The couple’s passion and knowledge is expressed in their work consulting, building and advancing policy, and in the hundreds of tours they have given of their home. They teach that if it isn’t affordable, it isn’t sustainable and live their motto, “Less life stuff…more life style!”