All correspondence must be made through the Vendor Portal. Specifications include, but are not limited to: The Gilbert-Chandler ADMS/P Update will identify and characterize existing drainage, flooding sources, and flooding hazards within the study area primarily due to land use changes, previous study age, hydrologic methods, modern mapping technologies, and population growth within the watershed. This includes two primary project goals: the development of a comprehensive, detailed, multi-frequency FLO-2D model for the study area, and a flood hazard assessment. Major tasks will include a compilation of the data collection results with the 2D model output to identify, quantify, and qualitatively describe significant drainage and flooding issues. Other supporting tasks include data collection, supplemental field surveys (as needed), public outreach, and stakeholder coordination. Tasks may also include evaluation of past flood mitigation alternatives within the study area and updating of the original Area Drainage Master Plan as necessary, or recommendation of a revised Area Drainage Master Plan for the area with newly identified possible alternatives and a conceptual design (15% plan development and associated cost estimate) of selected alternatives. The study area covers approximately 152 square miles in southeastern Maricopa County within the Town of Gilbert, the City of Chandler, the City of Mesa, the Gila River Indian Community, and unincorporated Maricopa County areas. All correspondence must be made through the Vendor Portal.
