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.

Today is the first ever UN sanctioned World Wildlife Day and given the importance of wildlife to the watershed we’re happy to celebrate.

In the United States in the 1930s all the wolves in Yellowstone National Park were extinguished. Over time the area lost a great number of aspen trees, the rivers saw major erosion, and other animals began to disappear. The lack of predators led to a great imbalance that impacted the water itself.

Check out the video below to learn more about the impact of predators on the watershed. 

If you only have four minutes to spare the Oldman Watershed Council shared an excellent and similar, but shorter video on their facebook page.

Welcome back to the Rewilding Our Rivers Discussion Series. Today we will look at the role of the floodplain and the importance of designing systems that support the meandering wishes of our rivers.

A floodplain is the flat area of land along a river or stream that is subject to flooding. The width of the floodplain is dependent on the meandering amplitude of the river. It is essentially the breathing room for a river or a stream to meander, overflow, re-route and change course. Rivers will flow where they want and the floodplain is there to provide space for the river to move.

The ecosystem of the floodplain consists of native grasses, woodlands, wetlands and riparian zones. The establishment of rooted vegetation helps to absorb the force as well as the volume of rising floodwaters. The vegetation also serves to stabilize bank erosion, filter pollutants and provide habitat for animals and recreational spaces for humans. Development of impervious surfaces on the floodplain such as buildings, roads and parking lots hinder the ability of the floodplain to absorb floodwaters and at the same time speeds up runoff into streams leading to increased downstream flooding.   

 If you've been searching for the perfect Alberta water themed Valentine's Day card look no further! 

Happy Valentine's Day from the Alberta WaterPortal team.

So far in the Rewilding our Rivers Discussion Series, we have discovered the importance of healthy soil systems and wetlands in the attenuation of water during flooding events. The previous two blogs talked about how soils rich in organic matter hold and retain more water, and how wetlands function like sponges across the landscape absorbing surface water runoff subsequently replenishing aquifers. In addition to ensuring that Alberta’s soils and wetlands are healthy, riparian zones also play a beneficial role in flood mitigation.

The riparian edge is where aquatic and terrestrial ecologies interface; formed by the merging of land and a river, lake, or stream. As unique ecosystems, riparian zones provide a vast array of ecological goods and services including decreased soil erosion; storing and recycling of organic matter; providing habitat for fish and wildlife; and improving water quality through the removal of nutrients such as nitrogen and phosphorus from surface and subsurface water. The functioning of these many goods and services is highly dependent on the width of riparian vegetation; at minimum a riparian zone should extend over the stream bank and 5 to 10 metres onto the floodplain[1]

Last week we learned the value of healthy soils and their role in flood mitigation . This week in honour of World Wetland Day 2014 on February 2, the Rewilding Our Rivers Discussion Series  will turn its attention to the significance of wetlands and their potential role in flood mitigation.

Wetlands are often called planet earth’s kidneys because of their ability to purify our water supply through natural filtration systems that absorb heavy metals and other harmful containments (like phosphorus). Wetlands are complex ecologies that offer many benefits and functions to our shared bio systems - most notably, they are able to retain and store water. In essence, wetlands act like sponges; they absorb rainfall, slowly saturate soil systems, and eventually recharge aquifers. By retaining and storing water, wetlands reduce the speed and volume of water entering our streams and rivers. This can be particularly important for some flood events. 

Wetlands near Utikuma Lake 
"Wetlands near Utikuma Lake, northern Alberta 2010" by Gord McKenna is licenced under CC BY 2.0.

The Ramsar Convention defines wetlands as areas of marshes, bogs, fens and peatlands. They are ecosystems that contain plant and animal life in water saturated areas. A wetlands’ ability to retain and store water is greatly dependent on its soil system. For instance, peatlands have a significantly greater capacity to retain and store water because they are made up of rich organic matter developed over thousands of years. This highlights the symbiotic relationship between wetlands and healthy soil systems and the role they can play in flood mitigation. Peatlands have become important ecosystems to protect on a global scale due to the simple fact that they are nearly impossible to reconstruct. One example of this is located in our back yard. Alberta is home to a UNESCO World Heritage Site and a Ramsar Convention Wetland of international importance located in the Peace-Athabasca Delta in the Wood Buffalo National Park.