Abstracts

advanced, event-based sampling. Example data streams collected through the Southern
Ontario Water Consortium’s Alder Creek Watershed facility will be used to demonstrate
this approach and to illustrate the utility of adopting near real-time watershed monitoring
for groundwater and surface water applications.
255 - Estimating Depression-Focussed Recharge in The Prairies
Using a One-Dimensional Model
Saskia L Noorduijn, Masaki Hayashi & Laurence R. Bentley
Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
The contribution of small topographic depressions to groundwater recharge in the northern
prairie landscape has proven challenging to estimate. However, the aggregate recharge
contributions of these small topographic depressions to the underlying aquifers may be
considerable. Thus, accurately quantifying depression-focused recharge will aid in the development
of sustainable groundwater management practice. Previous research has primarily
focused on determining the hydrological fluxes at the scale of individual depressions.
There has been a recent move towards increasing the scale of interest to investigate
depression hydrological processes at scales ranging from 10’s of km up to the size of the
entire watershed. At these larger scales, applicable models are subject to a trade-off between
accuracy of the recharge estimate and computational demand. The least computationally
demanding approach would be the use of a one-dimensional (1D) model for each
grid cell. However, invoking the 1D assumption will likely produce considerable error in
the estimated recharge when multiple topographic depressions are represented in one grid
cell. An alternative approach is to categorize topographic depressions based on their surface
area and density within one grid cell. The 1D model can then be applied to estimate
recharge from each of these categories. The total estimated recharge for that grid cell is
obtained as the summation of estimated recharge contributions from each category within
that grid cell. This approach implemented within a 1D model is hypothesized to produce
more realistic recharge estimation whilst limiting computational demand.
Regional Groundwater Systems 1
Wednesday, October 28, 13:00 – 14:40
Chair: Tom Gleeson
Room: Wagner
140 - Groundwater Residence Times in Chaudière-Appalaches,
Québec: Closing the Loop between Flow and Regional
Geochemistry
Debora Janos 1 , John Molson 1 , & René Lefebvre 2
1
Département de géologie et génie géologique – Université Laval, Québec City, Québec,
Canada
2
Centre Eau Terre Environnement – INRS, Québec City, Québec, Canada
54 IAH-CNC 2015 WATERLOO CONFERENCE