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Introduction 1 Purpose and scope 2 Previous studies 2 Acknowledgments 2 Approach 3 Description of study area 3 Bluejay and San Carlos residential canal systems 4 Canal and lake dimensions 4 Bridges and other constrictions 8 Hydrologic conditions 8 Tidal stage 8 Tidal discharge 10 Freshwater inflow 10 Water quality 11 Dispersive characteristics 17 Hydrodynamic model development for the existing canal system 18 Governing equations and assumptions 18 Numerical methods 19 Schematization of the canal systems 20 Model calibration and verification 22 Simulation of circulation as affected by tide gates 24 Tide-gate description and operation 25 Modification of BRANCH model for tide-gate simulation 26 Optimization of tide-gate locations 26 Simulation results for modified canal system 27 Simulation of tidal flushing 28 Governing equations and assumptions 33 Numerical methods 34 Selection of model input parameters 35 Results of model applications 35 Water-quality changes due to increased circulation and flushing 36 Summary and conclusions 41 References 43 FIGURES 1-2. Maps showing: 1. Location of Cape Coral 2 2. Study area within region of tidally affected saltwater canals in Cape Coral 3 3. Graph showing Caloosahatchee River streamflow and Fort Myers rainfall 4 4-5. Maps showing: 4. Study area and four functional units of saltwater canals 5 5. Path of fathometer survey in the Bluejay canal system 6 6. Graphs showing longitudinal depth profiles of selected canals in the Bluejay canal system 7 7. Map showing location of tidal stage, tidal discharge, and freshwater inflow sites in the Bluejay and San Carlos canal systems 9 8-9. Graphs showing: 8. Measured tidal stage at the boundaries of the study area,

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