ABSTRACT
Current provincial standards in Alberta (Canada) prescribe one-dimensional hydraulic models as a primary requirement for flood mapping because encroachment analysis must be performed. One-dimensional models can be insufficient to simulate complex two-dimensional flow patterns based on observations and previous studies. Therefore, supplementary two-dimensional hydraulic models are sometimes constructed for areas with complex overland flow patterns. These results are used to guide one-dimensional model setup to create an “informed” one-dimensional model, using an approach that is supported by provincial standards. In previous provincial studies, cross-section alignments were developed following standard practices without consideration of two-dimensional flow patterns, creating an “uninformed” one-dimensional model. The results of the “informed” and “uninformed” models are compared along a case study reach in Calgary, Alberta (Canada) where two-dimensional flow patterns dominate to investigate inundation differences. A discussion of the methodology used to develop an “informed” one-dimensional model, including advantages, challenges, and lessons learned, is provided.
