Developing a module in the Cold Region Hydrological Model (CRHM) platform to numerically estimate the surface and tile flows from an agricultural field in Londesborough Ontario.

To develop the tile flow module, we need to compare our output from the CRHM model to observed surface and tile out flow rates (60 minute time step over ~3 years), using hydrometric data collected on-site and site-specific parameters (texture, topography, etc) as inputs. We will use the CRHM platform to predict different components of the hydrologic budget, and a continuous time series of soil storage, which will subsequently be related to tile flow. We will use variables such as tile depth, lateral distance, length, as well as soil hydraulic characteristics, to predict the flow rate to the tile network. To accurately verify and calibrate our model we will simulate all existing events within our time series in our study sites. In subsequent steps, we will build on the tile flow module to include phosphorus concentrations in tile and surface outflow. This will include on-site data collected over 3 years at the sites at 2-12hr intervals.

The main goal of the project is to develop a module for the Cold Region Hydrology Model (CRHM) platform to predict surface and tile outflow from an agricultural field different climate conditions. We will use the CRHM platform to predict different hydrologic components, such as infiltration and storage in the soil, and will add a tile drainage component (working with the Core team). We use our model to predict the outflows in a large number of precipitation and snow melt events, at a site that is typical of conditions within southwestern Ontario. We will compare our outflow results to the observed edge of field outflow rates to calibrate and verify our model. Note, that this data set is collected to support the project titled "Agricultural Water Futures in Canada: Stressors and Solutions". Agriculture Water Futures is a Pillar 3 project under the Global Water Futures Program funded by Canada First Research Excellence Fund.

Macrae, M., Plach, J., Carlow, R., Kompanizare, M., and Pluer, W. (2019). Developing a module in the Cold Region Hydrological Model (CRHM) platform to numerically estimate the surface and tile flows from an agricultural field in Londesborough Ontario. Waterloo, Canada: Canadian Cryospheric Information Network (CCIN). Unpublished Data.

Londesborough farm site, Maitland River Watershed, Ontario

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