Perched and Low Flow Culvert Remediation: Ladders, Baffles and Concrete Apron Weirs.


The Problem

Aquatic Organism Passage (AOP) is critical for all aquatic species. Man-made structures, such as dams, weirs, tide gates and culverts, can impede or prevent this process by restricting the movement within waterways, streams and wetland habitats. For example water flowing through culvert pipes can be too fast/high, shallow, and/or perched which inhibits migration beyond these barriers.


The Solution

EKO-RX has created solutions to this problem for established culverts, etc. For large and small culverts EKO-RX and ATS Environmental have designed several types of Flexibaffle arrays combined with aquatic spat ropes and fish ramps to provide passage for all species.

Culvert Problem Culvert: Rx Baffle and Ladder


Spawning Fish Ladders

Culvert Baffle Arrays

The CBA systems are designed to be reliable, cost efficient and easy to install for new installations or be retro-fitted to existing structures.

How it works

The individual baffles are formed to match the internal radius of the culvert pipe, as shown above.


The CBA systems can be fitted prior to the installation of the culvert, or retro-fitted to existing structures. More importantly our CBAs are designed to resist damage from boulders or logs that may pass during flood events.

The individual baffles can be precut to match the internal radius of the culvert pipe or cut to length and installed on site to match conditions giving the migrating species a range of choices i.e. flexibaffle pattern arrays to create different flow characteristics:

  • depth
  • swale effect
  • resting eddies
  • velocity; and
  • turbulence.

International and US Patents pending.