TOWN OF IMMOKALEE STORMWATER MASTER PLAN

CLIENT:

SOUTH FLORIDA WATER MANAGEMENT DISTRICT - BIG CYPRESS BASIN OFFICE NAPLES, FLORIDA

LOCATION:

TOWN OF IMMOKALEE, FLORIDA

ESTIMATED CONSTRUCTION COST:

$7,000,000

PROJECT DESCRIPTION / SCOPE OF WORK:

Project goals were to develop the Stormwater Master Plan for the Immokalee Basin in response to noted flooding and water quality issues. XP-SWMM was used to simulate surface water conditions with applicable land uses. Simulation of flood and water quality conditions proved successful for 5, 10, 25, and 100 year flood events. Conceptual design alternative was selected by SFWMD and Collier County. Conceptual Design plans and Conceptual Permitting.

         Assisted data collection effort that included SFWMD Big Cypress Basin (BCB) gauges, recently flown Lidar Data used in DTM, survey of culverts, canal, ditch and wetland cross sections, DB-Hydro and field testing.

         Assisted in the build-out of an XP-SWMM model that consisted of 33 hydrologic sub-basins spanning over 15 square miles of canals, culverts, ditches and wetland flowways.

         Continuous simulation modeling of long term rainfall as part of the calibration and verification of the model with simulated groundwater interaction with surface water facilities.

         Event mean concentration water quality modeling using Harvey Harper method of estimating pollutant loadings for P, TN, E. coli, TSS and NH4. Water Quality modeling was calibrated using District gauge information and was verified by field testing performed after a summer 2004 storm event.

         Reports that were submitted to the District: (1) water quality assessment report, (2) engineering evaluation, (3) environmental evaluation, (4) flood control improvement plan, (5) wetland flow-way improvement plan and (6) water quality improvement plan.

         Alternative Design Models for 6 options included both water quantity and quality comparisons to the existing conditions. Improvements included 2 impoundments, culvert upgrades, dredging and widening of a canal, proposed collection systems and exfiltration trenches.

         Conceptual design of improvements with conceptual ERP permit, easement identification, and funding method analysis.