Sigma-Zed Model in EFDC+

DSI has developed an improved version of the EFDC code to help deal with pressure gradient errors that occur in simulations that have steep changes in bed elevation. This new version of the code is called the Sigma-Zed code (EFDC_SGZ) and has been integrated into the EFDC+. Sigma-Zed contrasts with the conventional EFDC approach which applies a sigma coordinate transformation in the vertical direction and uses the same number of layers for all cells in the domain.