Landscapes - Spring 2016 - (Page 51)

3 THRIVING WETLANDS | TROIS TERRES HUMIDES FLORISSANTES 1 CAROL CRAIG 3ANDWETLANDS: 3 DISCOVERIES... A LITTLE SERENDIPITY FR_RESUMÉ TROIS TERRES HUMIDES : TROIS DÉCOUVERTES Pourquoi s'ouvrir à la sérendipité? Les vingt ans de travail de Carol Craig dans trois terres humides albertaines démontrent que, malgré tous nos efforts, nous ne sommes jamais pleinement maîtres de ce qui arrive dans nos paysages. Malgré toutes nos recherches et tous nos plans, le succès dépend parfois d'une coïncidence heureuse, que ce soit une inondation, une sécheresse ou la défaillance du contrôle des sédiments. 1 FULTON: DURING 2 YEARS OF DROUGHT, THE SITE WAS LEFT ALONE TO MATURE ON ITS OWN | 1 FULTON : PENDANT DEUX ANS DE SÉCHERESSE, LE SITE A ÉTÉ LAISSÉ À LUIMÊME POUR PRENDRE DE LA MATURITÉ PHOTOS RON MIDDLETON EN_ THREE CONSTRUCTED WETLANDS used for stormwater management. Three locations. Three clients. Three problems. Serendipity. Three outcomes. Serendipity: when Horace Walpole, English Man of Letters, coined the word in 1754, it meant, simply, "a pleasant surprise." Today, serendipity means much more, implying an accidental discovery of something wonderful in the course of searching for something unrelated. Many scientific discoveries are serendipitous, none more so than our "accidental discoveries" in three Alberta wetlands. THE ACCIDENTAL DISCOVERY It was in the early 1990s that we began our work to construct Fulton Creek Marshland. The site was situated on what was then the very outskirts of Edmonton and surrounded by farmland. (Today, the area is residential.) The city needed fill material for the extension of Whitemud Drive and the Highway 21 interchange in south-east Edmonton. Once the fill was removed, the resulting "hole" would have a second use; it would become the largest constructed wetland/stormwater management facility in Edmonton. An integrated team of engineers, environmental scientists and a landscape architect created the vision, pulled the drawings together and specified a variety of soil preparations and planting and mulching techniques to see what would work. The clients, Alberta Transportation and the City of Edmonton, were open to some experimentation; they trusted they would gain knowledge that could be applied in other locations. Research - lots and lots of research - was undertaken to determine the planting palette, upland soil sources and wetland soil sources, and choose three different mulch types. We investigated planting techniques including plowing, seed stratification and scarification, livestaking, brushmattresses, live plug transplants and growing whips in advance, and tested them on the site. Slope orientation influenced the planting palette as did anticipated flood levels. Belownormal water zones were manipulated to provide both benching for varying emergent plant communities and deeper zones for 2016 vol. 18_no. 1 51

Table of Contents for the Digital Edition of Landscapes - Spring 2016

Returning the Tide
A Question of Balance
A role for the Applied Ecologist
WET Design
The Ballad of Frog Plain
Landscape Laboratories|Laboratoires Paysagers
1000 Acres in Essex
3 Wetlands: 3 Discoverles...
Fen and White Cedar
Ecological Landscaping
The Last Word | Le Mot De La Fin

Landscapes - Spring 2016