The Bog

The Bog is where thoughts, opinions, discussion pieces, and action converge. Influential thinkers from the water community are invited to share their insights on current or controversial water topics. Please note that the views expressed herein are those of the authors, and do not necessarily reflect the position of the Alberta WaterPortal.

A new report on historically identified detention and diversion sites, commissioned by the Alberta Flood Recovery Task Force and executed by Alberta WaterSMART, has been added to the Flood Recovery Task Force page.

This report explores 100-110 years of historical documentation on previously considered options for both drought and flood mitigation in the Elbow River Watershed. Many of the potential options come from reports by the Department of the Interior (established in 1873 by Sir John A. MacDonald) which had surveyed the land by foot looking for sites where the topography of Alberta could be used to create reservoirs to combat drought. 

Executive Summary

The purpose of this study is to review historical records to identify previously proposed detention and diversion sites on the Elbow River, and determine if these historical sites have any merit for further investigation and consideration by the Government of Alberta (GoA) as an alternative to the mitigation options currently being reviewed by the Flood Recovery Task Force.

An initial historical review of potential detention and diversion sites on the Elbow River provided twelve possible options that could be implemented to mitigate for both flood and drought.

Of the twelve identified historical detention and diversion sites it is recommended that the Priddis Creek diversion be seriously considered as an option for flood and drought mitigation. The Priddis Creek diversion is designed to mitigate for flooding upstream of Bragg Creek and the City of Calgary using the natural creek bed and low lying topographical areas for channeling the water flows. By using natural topography the Priddis Creek diversion has a greater potential to slow down the water; subsequently reducing peak flows. It is also recommended that the historical resevoir sites identifed by the Department of Interior in the 1890s, along with the McLean Site, should be further investigated for feasibility. These storage sites are recommended due to their use of natural topography and their ability to mitigate for flooding upstream of Bragg Creek and the City of Calgary.

In order to ensure that all the flood mitigation options are considered for all watersheds throughout Alberta, Alberta WaterSMART recommends further investigation into all mitigation options by continuing to undertake this type of historical analysis for all watersheds throughout Alberta.

Some of the current proposed options have received criticism by the water community for the potential impact they would have on the watershed. Do any of these proposed options seem like promising alternatives?  If not, what options would you recommend exploring?

 

Welcome back to the discussion series Rewilding Our Rivers - a look at natural flood mitigation options for Alberta. This week we turn our attention to the importance of healthy soils and how the building of organic matter can play a significant role in flood mitigation.

Soil is made up of a complex web of life, where a single teaspoon of soil can contain billions of living organisms. Created from the functions of its many parts including bacteria, fungi, minerals, air and water, nurtured by sun making soil a living network from which all plant life sprouts.  

Healthy soil is considered one of the most complex ecosystems on the planet. Like all living organisms, soil requires nutrients (food), water, and air. Organic matter is essentially the soil’s food system created from decomposed organic material such as dead plants (carbon) or animal manure (nitrogen).  The decomposition of this matter into the soil system creates a topsoil layer called humus; a dark black living structure. Humus is essentially mature compost that has reached a state of stability, where it needs no further decomposing. Humus, a dense organic matter, significantly increases the soil system’s ability to retain nutrients and moisture.  Thus, healthy soil results in structure that is rich in organic matter enabling it to hold, filter, and purify water[1]

A recent article written in The Guardian by scientist George Monbiot [1]discusses emergent research coming out of the United Kingdom that tells us rivers do not necessarily store the precipitation that falls in their catchments; but rather the majority of the precipitation is stored in the soils of their floodplains  This scientific finding directly questions the value of traditional flood mitigation measures, such as canalizing and dredging rivers, techniques that are now known to increase flow rates to downstream communities.

Some scientists are now pushing for the implementation of softer engineered solutions, such as the rewilding of our rivers. Rewilding rivers, among other elements, requires the redesigning of curves and snags back into the river system along with connecting rivers to uninhabited land designated for flooding. The likelihood for downstream flooding can be greatly reduced by creating a catchment for sediment and rock, ultimately reducing the energy and speed of the river.

Naturalist, hunter and former Banff National Park superintendent Kevin Van Tighem revisits his July 2013 article entitled "Safeguarding the Source”,  

This article, published in the July 2013 edition of Alberta Views magazine, remains no less relevant in the wake of last year's destructive flooding (driven by an exceptional precipitation event but made worse by damaged headwaters landscapes that shed the water too fast) and by the public consultations, which will conclude this month, on a draft land use plan for the South Saskatchewan Regional Plan.

We at the Alberta WaterPortal are pleased to reveal our new website. A driving force behind the redesign of the Alberta WaterPortal was the desire to create a website with more intuitive navigation. Content is now sorted into three major categories: Learn, Work, and Enjoy.

Learn

The “Learn” area acts as a library of knowledge on water to inform users about the origins of Alberta’s water, how water is used, water management in our province, the relationship between water, energy and food, and the impact of water on daily life.

Work

The “Work” area presents projects and research conducted by the Alberta water community, showcases existing groups within the water community, and provides a toolkit of resources for those whose work/volunteering revolves around water. Visitors to the Alberta WaterPortal can learn more about the Watershed Planning and Advisory Councils (WPACs), Environmental Non-Governmental Organizations (ENGOs), industry organizations, and academic and government institutions focused on water-related issues. We will be adding to the water community section over the coming weeks and if you would like to see your organization included please contact us. 

Enjoy

The “Enjoy” area focuses on personal, primarily recreational, uses of water. Download a water related app for your mobile device, learn about water conservation techniques, or check for weather advisories to ensure that Alberta’s water may be enjoyed responsibly and safely.

What else is new?