Specifications include, but are not limited to: • Evaluate Existing Model: o Review existing hydrologic and hydraulic stormwater system models o Review City provided hydrologic/hydraulic reports and projects o Recommend the continued use of XP-SWMM or provide justification for choosing a new stormwater modeling software, and convert existing XP-SWMM model to chosen software platform o Review existing data and identify any potential additional data that would improve model performance Recommend method for considering anticipated impacts of climate change on stormwater within the City of Eugene Evaluate Eugene’s IDF curves for potential update • Model Update: o Provide updated major drainage basin and subbasin delineations Both with the updated models and as georeferenced polygons compatible with ArcGIS. o Update stormwater models to account for the changes in land use and impervious area, stormwater conveyance infrastructure, stormwater detention facilities, and other stormwater infrastructure developed since the original creation of the model and projected. o Develop and run two scenarios: Existing conditions, using current impervious area estimations and weather data Future conditions, accounting for planned densification and urbanization, as well as changing weather patterns o City will identify locations of known conveyance, flooding, or related maintenance issues, and other areas of particular interest. Validate model in consideration of known flooding and conveyance issues o Develop planning-level conveyance/capacity-related capital improvement projects list including project concept descriptions, cost estimates, and funding source(s). o Assess all conveyance/capacity capital projects to identify and mitigate potential negative impacts and identify opportunities to enhance water quality benefits.
