Project: Upper East Fork Cave Creek (UEFCC) Area Drainage Master Study Update (ADMSU)

Client Name: Flood Control District of Maricopa County

Key Personnel: Brian Schalk – Project Manager; Hari Raghavan – Project Engineer/Technical Lead; Ed Kern – FLO-2D Modeling

Project Description: The UEFCC ADMSU is being completed to identify existing flood/drainage problems and feasible mitigation options using a regional FLO-2D model that accurately represents existing conditions and can simulate alternative scenarios that may include various mitigation strategies such as Low Impact Development/Green Infrastructure practices. The 27-square-mile study area is located in the densely developed area of north Phoenix. The highly complex, regional FLO-2D modeling reflects urbanized study area characteristics such as: several regional channels and detention basins; flow diverting property walls and building footprints; several large storm drain networks (trunk lines, laterals, manholes, inlets, etc.); hundreds of hydraulically significant culverts; roadway conveyance, including significant 1-dimensional flow via numerous inverted crown streets; and sediment-laden flow from mountain preserves. FLO-2D modeling of the 27-square-mile study area is being performed using a grid comprised of elements measuring 20’x20’, totaling nearly 1.9 million grid elements.

Project Outcome and Benefits: FLO-2D modeling provides the client detailed H&H characteristics such as flow rate, depth, and velocity every 20 feet across the entire study area. Modeling results will be used for inundation mapping, hazard and risk assessment, and development of flood mitigation alternatives.