Careers Contact Us
Start A Project mobile

I-4 Ultimate Reconstruction

Orlando, Florida

Owner:

FDOT

Engineer:

Jacobs

Contractor:

SGL Constructors

Installation:

2018

Technical Description:

  • 2,372' of 96" DuroMaxx® Steel Reinforced Polyethylene
  • 6,411' of 48”, 60”, and 72” perforated Aluminized Steel Type 2
  • Stormwater Management StormFilter®

The I-4 Ultimate reconstruction project is the largest transportation project in Florida history. The $2.3-billion public-private partnership consists of the reconstruction of 21 miles of highway that runs through the heart of downtown Orlando. 

Engineers designed nine underground stormwater storage systems to prevent flooding and control water quality. Underground storage was chosen because of a lack of land space and because the FDOT was working to build a functional Interstate and an aesthetically pleasing corridor for Central Florida.

Three of the underground stormwater detention systems are located where I-4 crosses Lake Ivanhoe, a popular lake just north of downtown. In addition to providing the proper storage volume, the stormwater solution also needed to meet the St. Johns River Water Management District (SJRWMD) regulations that call for nutrient filtration removal rates of 80%+ phosphorous and 50%+ for nitrogen for all runoff entering the lake.

Two of these detention systems are located in areas with a high water table, so a watertight system was needed to ensure groundwater did not infiltrate and displace the design storage volume. These sites utilized DuroMaxx Steel Reinforced Polyethylene (SRPE).

The stored stormwater is treated before discharge into Lake Ivanhoe using the Stormwater Management StormFilter equipped with cartridges filled with PhosphoSorb®, a media that removes total phosphorus. The use of PhosphoSorb enabled the engineers to meet the SJRWMD removal rates for phosphorous and nitrogen of all runoff enter the lake.

In addition to the three sites near Ivanhoe Lake, six other detention systems were constructed to prevent flooding along the reconstructed roadway. These detention systems use a combined 6,411 LF of 48”, 60”, and 72” perforated, ALT2 corrugated metal pipe providing 1,077,636 gallons of storage in the pipe. Additional storage was achieved by using perforated CMP and limestone backfill.  With the proximity to I-4, accessibility and speed of construction were very important for the contractor. The inherent nature of CMP’s longer lengths (24’ lengths) and lighter aluminized steel pieces allowed for fewer delivery trucks, smaller installation equipment, and fast installation.

A well-graded granular limestone was used for the backfill of the system. The limestone allowed for easy compaction, as well as good drainage throughout the entire system.

Technical Description:

  • 2,372' of 96" DuroMaxx® Steel Reinforced Polyethylene
  • 6,411' of 48”, 60”, and 72” perforated Aluminized Steel Type 2
  • Stormwater Management StormFilter®

800-338-1122 | www.ContechES.com

© 2021 Contech Engineered Solutions LLC, a QUIKRETE Company