Numerical Modelling

Riggs was retained by Genivar to assess receiving stream impact due to waste water treatment plant discharge.  

Riggs developed a 3D hydrodynamic model of the Napanee River from the downtown to its outlet at the Bay of Quinte in order to quantify the impact of increased effluent discharge on the existing river. A hydrodynamic model was necessary as simpler techniques proved to be inadequate in estimating mixing and dilution characteristics of the receiving stream.  

The 3D numerical model uses Environmental Fluid Dynamics Code (EFDC) as part of the receiving stream study. Effects of proposed discharges were quantified, and summarized according to current Ministry of Environment guidelines.

Riggs has recently completed a hydrotechnical study on behalf of the Kettle Creek Conservation Authority. As part of the study, a hydrologic model of the Kettle Creek watershed was developed. The objective of the hydrologic modelling was to quantify the response of the watershed to high intensity short duration storm events. The model was calibrated and verified using existing data. Following calibration, precipitation inputs were prepared to simulate a regulatory storm event. Flows obtained from the hydrologic model were subsequently used to delineate the extent of flooding.  

Hydraulic modelling within the town of Port Stanley was carried out to establish flood lines for a number of different scenarios related to harbour dredging. It was established that different harbour configurations (dredged to full draft, dredged to recreational draft, or fully silted) could produce markedly different upstream flooding impacts. The scenarios of our study were presented both to the conservation authority and municipal officials, as well as to local interested residents.