What is HPTRM?
HPTRM stands for High-Performance Turn Reinforcement Mat and is considered hardened shoreline. It is a thick, anchored poly matting that is secured to slopes, river edges, lake banks, and other areas where water meets land. It is used underneath sod, but in areas of extreme erosion with constant water flow, wave-action, or an unavoidably steep slope (greater than 4:1).
Why do we hate it so much?
Study after study shows that it just doesn’t work. Here are some pictures taken by civil engineers exposing its faults (see attached). The typical lake, pond, canal, or river shoreline here in SW Florida does not endure heavy waveaction (constant, violent pounding by wakes or waves) or heavy current, ergo, the use of HPTRM in these situations leads to a solution that is way over-engineered, over-priced, and overly complicated.
What is a good alternative?
Rip rap, #57, shell.