Lake Havasu City Risk MAP

Project: Lake Havasu City Risk MAP

Client Name: Mohave County Flood Control District, Lake Havasu City

Key Personnel: Brian Schalk – Project Manager; Ed Kern – Project Engineer

Project Description: Lake Havasu City is significantly impacted by highly unconfined, sediment laden, high velocity flows from the mountains and alluvial-fan-like features located to the east of the City. To help protect residents and property within the City limits, the USACE constructed a series of levee-like structures and large drainage channels in the 1960's to collect, divert, and convey flood flows through the City and eventually outfalling at Lake Havasu (Colorado River). The hydrologic and hydraulic analyses (HEC-1 and HEC-RAS) used for design and continued evaluation of the City's flood protection structures and large flood control channels are significantly outdated. As part of the Lake Havasu City Risk MAP Project, these analyses were updated using a two-dimensional modeling approach. Hydrologic and hydraulic (H&H) analyses were conducted using the two-dimensional modeling software FLO-2D for the entire contributing watershed to the City. Modeling data was used to assess channel stability (?) such as potential lateral erosion, scour, long-term aggradation and/or degradation. Modeling was also used to asses the flood protection level associated with the levee-like structures located within and outside City limits. Non-regulatory risk map products were developed to help communicate to the public the hazards and risks associated with the identified high risk areas.