US Army Corps of Engineers
Jacksonville District

CERP WCA 3 Decomp and Sheetflow Enhancement (C)

March 2018


Water Conservation Area 3 Decompartmentalization
and Sheetflow Enhancement

Construction General (C)

Congressional Districts: 18, 20, 21, 22, 23, 24, 25, 26, 27


Congress authorized the Comprehensive Everglades Restoration Plan (CERP) as the framework for restoration of the south Florida ecosystem in the Water Resources Development Act (WRDA) of 2000, Section 601 (b)(1)(A). One of several projects identified for implementation as part of CERP, the Water Conservation Area (WCA) 3 Decompartmentalization (Decomp) and Sheetflow Enhancement Project is designed to restore sheetflow and water movement in the Everglades landscape. The Decomp project includes the modification or removal of levees, canals, and water control structures in WCA 3A located in western Broward County. The project was originally envisioned to be completed in three project implementation reports (PIRs). PIR 1 and 2 would focus on those features described in the Restudy Decomp project Part 1, which were conditionally authorized, and PIR 3 would cover those identified in Part 2 in the Restudy. PIR 1 was suspended in 2010 and its restoration features have since been incorporated into the Central Everglades Planning Project (CEPP), authorized in WRRDA 2016. Decomp Phase II is scheduled to begin in 2021.

The DPM includes installation and interim operations associated with the following features: ten controllable gated culverts within the L-67A Levee (S-152), degradation of 3,000 linear feet of the L- 67C levee and three, 1,000 ft backfill treatments in the L-67C canal (no backfill, partial backfill, and complete backfill). Scientific and water quality monitoring activities began in October 2013 to evaluate the uncertainties with depth, hydroperiod, sheetflow, and canal backfilling associated with the full-scale DECOMP project


Estimated Total Cost $138,058,000
Estimated Federal Cost $75,954,000
Allocation thru FY17 $31,768,000
Allocation for FY18 $0
President’s Budget FY19 $0


South Florida Water Management District (SFWMD)
3301 Gun Club Road
West Palm Beach, Florida 33406


The Project Delivery Team (has documented all work completed for PIR 1. The work completed for the PIR was incorporated into the Central Everglades Planning Project (CEPP) and authorized in WRRDA 2016. The CEPP South validation report commenced in FY18 and incorporates elements of the Decomp PIR 1.

Designed to answer uncertainties with the full-scale Decomp project, the large-scale field test, Decomp Physical Model (DPM), kicked off in late 2008. The DPM construction was completed in 2013 in Miami-Dade County along the southern end of the L-67A and L-67C canals within Water Conservation Area 3 (WCA-3) in a region referred to as the “pocket.” The DPM was successfully operated November - December 2013 (FY14), November - December 2014 (FY15), November 2015 - January 2016 (FY16), and October 2016 - January 2017 (FY17). Phase I testing ended in January 2017. Phase II testing with extended testing periods commenced in January 2018 and is scheduled to run through 2021. Information gained will be documented and used to guide future restoration efforts

Map of Decomp project area