Immokalee Stormwater Master Plan Update   

​Client: Collier County (sub-consultant to Robau & Associates)​
Year: 2016-2018
​
About: 
The first objective of this project was to conduct a comprehensive update of the XP-SWMM model originally developed in 2004. The updated model was then used to evaluate nine (9) proposed projects and subprojects to improve the stormwater management system. Design storm simulations for the 10- and 25-year/3-day storm events were utilized. Water quality improvements from the proposed ponds were also evaluated using the Harper Method.

Applied Skills:

• H&H Modeling: Data Processing, Conceptualization & Setup
• Design storm simulations
• Level of Service
• Scenario Evaluation

Consulting Areas:

• Surface water Management
• ​Water quality studies

Software Applied:

• XP-SWMM
• SWMM5 to SHP
• ArcMap
• ArcHydro
• Fill Sinks Plus

Specifics:
The model update included:

• New sub-basin and flow paths delineation based on new topography data and by using ArcHydro tools, as well as aerial imagery and permit information.
• New landuse and soil data used to determine the curve number (CN) for infiltration determination.
• New runoff parameters (area, % impervious, width, and slope).
• New conduit parameters based on the County geodatabase, permit information, other models for the area, and field visits.

​Outcome:
The updated model was used to evaluate the stormwater management system in Immokalee and to estimate the potential effects of the proposed projects to reduce the extent and duration of flooding in the project area.  Flood inundation maps and road Level of Service (LOS) compliance maps were produced for this evaluation. The proposed designs were adjusted according to the model results in order to optimize performance.  

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