CGA is currently finalizing the construction inspection services for the stormwater design project for the Hallandale Beach NE Quadrant Drainage Basin, which encompasses an area of approximately 170 acres. This tidally influenced basin is bounded by Atlantic Shores Boulevard, Federal Highway (US 1), Hallandale Beach Blvd (HBB), and NE 14th Avenue in the City of Hallandale Beach, Florida. Land uses within the study area are primarily single-family residential and multi-family residential.
There are a number of drainage facilities within the project area with limited conveyance capacity and high head loss. Lowest floor elevations average between 5.5’ to 6.5’ NGVD, and roadway elevations are approximately 3.7’ to 3.9’ NGVD within the study area. The conveyance system is subject to the effects of tidal fluctuation. Consequently. at times there is virtually no head available to drain the basin. The lack of conveyance capacity within this system has led to 37 Severe Repetitive Loss (RL) properties and the complete inundation of the roadway system for extended periods during storm events of lesser frequency than that required by SFWMD.
Using ICPR, CGA modeled and designed an improved collection system conveying water to two new duplex pump stations connected to a total of 15 wells. The new wells are pressurized with 15 feet of head in order to produce the necessary discharge into the G-III aquifer. The collection system piping was be upsized in order to achieve adequate flows into the new pump stations. Additionally, as part of the permitting requirements, a complex monitoring system has been installed to allow for real time review of pressure data at each drainage well along with monitoring wells installed within the project area to record ground water levels. The existing gravity outfalls were left intact, with the only modification being the installation of a “backflow” flap gate in a City structure at the downstream end of the gravity system. The flap gates are designed to stop the tidal water from flowing back into the gravity system at higher tides
The project was permitted through FDEP and the Broward County Environmental Protection and Growth Management Division. CGA, in conjunction with the City of Hallandale Beach, worked with FEMA to get an expansion approved for the existing HMGP grant. The expansion was approved to provide over $15 million in funding for this project and another project for the adjacent neighborhood.
City of Hallandale Beach
Drainage and Sewer Force
Pump Station & Injection
Well Design and Permitting
Instrumentation & Controls