banner

Rainwater Management

Download British Columbia guidance documents. Learn about the guiding philosophy and tools for implementing ‘sustainable watershed systems, through asset management’. Be inspired by success stories. Understand why it is necessary to manage the complete spectrum of ‘rainfall days’ in a year, preserve or replicate the pathways by which water reaches streams, and so mimic flow-duration distribution. The emphasis herein is on the drainage runoff side of the Water Balance distribution.

Latest Posts

DOWNLOAD: Stormwater Planning: A Guidebook for British Columbia


“Released in 2002, the Guidebook provides a framework for effective rainwater management throughout the province. This tool for local governments presents a methodology for moving from planning to action that focuses on implementing early action where it is most needed,” states Laura Maclean. “The Guidebook approach is designed to eliminate the root cause of negative ecological and property impacts of rainwater runoff by addressing the complete spectrum of rainfall events. The Guidebook approach contrasts with conventional ‘flows-and-pipes’ stormwater management.”

Read Article

Water Balance Model – On Tour!


“Have a look at some of the Water Balance Model slideshow presentations that have been made to industry and government groups starting in 2001. This includes some of the early presentations on the Water Balance Methodology that helped pave the way for the paradigm-shift from 'peak flow thinking' to 'volume-based thinking'. The many presentations created awareness and influenced expectations,” stated Ted van der Gulik.

Read Article

OPINION PIECE: “Entrenched beliefs and a reluctance to change 20th century engineering practices have consistently resulted in missed opportunities to ‘get it right’,” wrote Kim Stephens, Executive Director, Partnership for Water Sustainability (Vancouver Sun, September 2018)


“In the absence of a regulatory requirement, the process to adopt, change or evolve accepted practices is painfully slow. Reinvigoration of the provincial oversight function is essential to help local governments be effective in moving B.C. towards restorative land development,” wrote Kim Stephens. “The good news is that – starting with ‘Living Water Smart, B.C.’s Water Plan’ in 2008 – a provincial policy, program and regulatory framework is in place to achieve this desired outcome.”

Read Article

DODGING DAY ZERO IN CAPETOWN: “The next step comprises the management of all water within the urban water cycle. A key component of this is rain and stormwater harvesting, which offers great growth opportunities,” stated Deputy Mayor Ian Nelson


“The City has already initiated steps towards the goal of becoming a water-sensitive city by 2040. In the City’s draft water strategy, which will be taken through an inclusive public participation process over the coming months, the use of rain and stormwater is included,” stated Ian Neilson. The first step in being able to use stormwater as a water resource was to move stormwater and river management out of the City’s transport department and into the water department. This has already been done, added Nielson.

Read Article

NEW REPORT FROM INTACT CENTRE ON CLIMATE ADAPTATION: “Too Small to Fail – How Communities Can Prepare for Bigger Storms”


A featured project is the Across Canada Workshop Series, led by the Partnership for Water Sustainability in British Columbia, to showcase the online Water Balance Model Express. “The Partnership has many online tools for assessing site-specific conditions which are available for free or available through a free trial,” stated Dr. Blair Feltmate. “Whether a project team is interested in setting watershed-specific performance targets or a homeowner would like to learn about water flow on their property, there are tools for various types of projects which may be helpful at different stages of a project.”

Read Article

SUSTAINABLE WATERSHED SYSTEMS: An understanding of Daniel Pauly’s “Shifting Baseline Syndrome” is a foundation piece for reconnecting hydrology and ecology, and turning the clock back to move towards restorative development


The phrase Shifting Baseline Syndrome describes an incremental eroding of standards that results with each new generation lacking knowledge of the historical, and presumably more natural, condition of the environment. Each generation then defines what is ‘natural’ or ‘normal’ according to current conditions and personal experiences. “Every generation will use the images that they got at the beginning of their conscious lives as a standard and will extrapolate forward. And the difference then, they perceive as a loss. But they don’t perceive what happened before as a loss,” stated Daniel Pauly.

Read Article

Leading Change on Canada’s Prairies: A unique rain garden has been installed along the perimeter of Harvest Townhomes, which the developer says is a first in Saskatoon, Saskatchewan


“West Coast style has migrated to the prairies at Harvest Townhomes, designed and constructed by Arbutus Properties in its popular community, The Meadows,” wrote Jeannie Armstrong. “The Harvest Townhomes development has above-ground 3-storey townhomes with colourful exteriors and attached garages, a style more typical of Vancouver than Saskatoon. When fully built out, Harvest Townhomes will comprise over 225 units. A unique rain garden, developed in consultation with the University of Saskatchewan, has also been installed along the perimeter of Harvest Townhomes.”

Read Article

VIDEO: “Maximum Extent Practicable, or MEP, has become the definitional driver for a lot of what we do,” said Andy Reese, engineer and writer who coined the term Voodoo Hydrology in 2006 to explain the pitfalls inherent in urban drainage practice


“Years ago I was privileged to travel around the US with EPA putting on seminars,” stated Andy Reese in 2011. “Three off-the-cuff words have probably have had the biggest impact in influencing land design of any sort of regulatory program that ever was, and perhaps that ever will be. Those three words were maximum, extent and practicable. Back then, none of those words were capitalized. They were just a made-up term. But MEP is now taking on green infrastructure overtones, sustainability overtones, LID overtones, and on and on.”

Read Article

Stream daylighting would reconnect community to Mississippi River: Redevelopment of historic Ford car assembly site in Saint Paul, Minnesota offers potential for “A 21st Century Community”


There once was a creek running through the St. Paul land where Henry Ford built his Twin Cities Assembly Plant. The project will reintroduce area residents to the Mississippi River.“We know we have a new neighborhood and how do we allow the existing neighbors and new neighbors to physically connect with the river as a resource?” he asked. “This is so powerful, because it’s also a way to have people reconnect with the urban ecosystem and the downstream river.”

Read Article

Global runoff volumes are increasing dramatically, according to a new Columbia University study (2018): “Our findings can help provide scientific guidance for infrastructure and ecosystem resilience planning and could help formulate strategies for tackling climate change,” stated Dr. Pierre Gentine


Columbia Engineering researchers have demonstrated that stormwater runoff extremes have been dramatically increasing in response to climate change and other anthropogenic changes to the environment. The researchers also found that storm runoff has a stronger response than precipitation to human-induced changes (climate change, land-use land-cover changes, etc). “Our work helps explain the underlying physical mechanisms related to the intensification of precipitation and runoff extremes,” Pierre Gentine said. “

Read Article

SUSTAINABLE WATERSHED SYSTEMS: Reinvigoration of the provincial oversight function is essential to help local governments be effective in moving British Columbia towards restorative land development.


Water defines B.C., and the rhythms of water are changing. Civil engineers, urban planners and decision-makers must change their mind-sets and grasp the inherent complexity and unpredictability of working with natural systems.“80% of the revitalizing work done by urban planners and civil engineers in the 21st century will undo 80% of the work their predecessors did to cities and nature in the 20th century,” foreshadows Storm Cunningham, author of the Restoration Economy. “We don’t fully understand complex systems, so humility and adaptive management are needed to restore nature, and to revitalize cities.”

Read Article

WATER BALANCE PERFORMANCE TARGETS: “The flow-duration relationship is the cornerstone of British Columbia’s Water Balance Methodology. As understanding has grown, the methodology has evolved.” – from Water Balance Approach on Vancouver Island (released by the Partnership for Water Sustainability in January 2018)


The Water Balance Methodology has its genesis in the whole-system approach that Dr. Ray Linsley (1917-1990) championed more than 60 years ago. As a professor at Stanford University, he pioneered the development of continuous hydrologic simulation as the foundation for water balance management. “To be useful…the simulation model must be physically based and deterministic, and it must be designed to simulate the entire hydrological cycle…hence it must be a water balance model,” wrote Linsely in 1976.

Read Article