Griffin Farms is a $200M, mixed-use housing development near Orlando, Florida. The project is intended to appeal to younger homebuyers by locating new residential space alongside restaurants and retail. The development will feature 100,000 square feet of retail, 264 luxury apartments and 165 luxury single family homes.
A development of this size needs a robust stormwater management system. Land use efficiency and cost drove the use of underground infiltration. After evaluating all the options, engineers at Kimley-Horn selected a corrugated metal pipe (CMP) detention system from Contech Engineered Solutions.
CMP was selected as it provided the most cost efficient solution and the most compact footprint. The ability of CMP to support traffic loading with minimum cover allowed for an increase in pipe diameter, maximizing storage efficiency of the system. In addition, the ability to incorporate risers and inlets directly into the system resulted in saving on drainage structure cost.
This was the City's first underground storage project and they were very focused on long term maintenance and longevity of the system. To approve the permit, the City required the use of CDS hydrodynamic separators as pretreatment to the underground system. The use of the CDS units will help prolong the life of the infiltration system by removing debris and sediment that can collect on the invert and within the stone backfill voids. The CDS units are also easier to clean and maintain compared to the infiltration system itself. The average CDS unit can be cleaned via a vaccum truck in less than 30 mintues, with no confined space entry. The nine CDS units installed at this site also acted as inlet structures, further reducing the cost of system.
As on every project, Contech provided design support including sizing calculations, drawings, and permitting assistance with regulators. Contech also provided installation and delivery support, coordinating the delivery of the CDS units and pipe to meet the contractor’s schedule, which called for the installation of 1,500 LF of pipe per day. The entire system was installed in 6-weeks.