CITY OF CAPE CORAL BASIN STORAGE. CAPE CORAL.
After the successful development of the City of Cape Coral Stormwater Model, the model was updated and re-calibrated with focus on dry season water levels and flows in the City for the purposes of watershed planning for irrigation supply. This model was coined the Charlotte Harbor – North Caloosahatchee River Basin, or CH-NCRB model. Several key projects have utilized the CH-NCRB model, including the Midsummer Canal (Weir 29) Structural Improvement Assessment and the Hydraulic Modeling in Support of ERP Application for Weir 29 Improvements, as well as the Basis of Design Report for the Southwest Aggregates Reservoir and the Cape Coral Basin Storage Study for the Utilities Extension Projects: North 1 and North 2 Areas.
HYDRAULIC MODELING IN SUPPORT OF ERP APPLICATION FOR WEIR 29 IMPROVEMENTS
ADA updated the existing CH-NCRB model with detailed information in order to better represent structures and channel dimensions in the Yellow Fever Creek watershed and its contributing basins. The updated model was calibrated, design storms were simulated, and areas of flooding were identified. The model results were processed to determine the optimal design for the proposed Structure 29. In addition, design discharges were determined for the proposed Weir 29 and any impacts to the receiving Yellow Fever Creek were evaluated. It was determined that the reduction of dry season flows caused by the improvements to Weir 29 will be mitigated by the implementation of a basin interconnect pump currently under design from Lee County.
BASIS OF DESIGN REPORT FOR THE SOUTHWEST AGGREGATES RESERVOIR.
The Southwest Aggregates mine site has been evaluated as a potential off-line storage reservoir or flow equalization basin, collecting wet season runoff from Cecil Webb and releasing it to Yucca Pens and the City of Cape Coral during the dry season. This potential storage reservoir would provide additional storage for the excess water currently being detained on the southwest portion of Cecil Webb WMA. ADA updated the regional CH-NCRB model in three different ways for key project tasks: 1) by implementing the proposed Bond Farm and Southwest Aggregates reservoirs and running an initial seepage assessment, 2) by increasing the model simulation period to include 2007 to 2015 a long-term assessment of impacts and water supply was made, and 3) by cutting the model down to a smaller domain centered on the SW Aggregates site and increasing the model resolution, a more focused understanding of the nearby impacts of the reservoir was evaluated. ADA documented the modeling processes that were used to determine the impacts of the proposed Southwest Aggregates Reservoir in terms of available storage, yield, seepage impacts, and groundwater and surface water impacts.
CAPE CORAL BASIN STORAGE STUDY FOR THE UTILITIES EXTENSION PROJECTS: NORTH 1 AND NORTH 2 AREAS
The City of Cape Coral Utilities Expansion Project (UEP) currently supplies over 43,500 ERUs within 50 square miles of the City. The North 1 and North 2 expansions will add over 17,000 ERU’s, increasing the required irrigation supply from the City. ADA evaluated how the North 2 and North 1 expansions will impact water levels in the supply basins and determined the optimal pumping and gate operations required for supplying existing reuse pumps and supplying irrigation water to new users, all while maintaining minimum levels in the City canals. This optimization of the transfer pumps involved complex operations at key locations. In addition, proposed modifications to existing weirs were implemented in a phased approach to determine the structure modifications that were most important for storing dry season water. This analysis will be crucial to the City as new irrigation supply pumps go on-line and further structure changes are planned.