Conveyance Change in the St. Clair River 2007-2012

Swath bathymetry of the main stem of the St. Clair River was collected in 2007 and again in 2012, providing the data sets required for a thorough analysis of conveyance change in that river. Conveyance change in the St. Clair River is examined through multiple methods and models. Each method and model are explored to gain a sense of how the conveyance capacity of the river may be changing. Depth change and cut-fill analyses with and without accounting for survey error show change in the river but net change is minimal especially after accounting for survey error. Hydrodynamic modeling of the same discharge/water level scenarios in the 2007 geometry versus the 2012 geometry also show minimal change with a maximum of 1 cm change in water levels at a single location.