It’s a web! The engineer called it GeoWeb. And at first look it didn’t jibe with my preconceived notion.
Perhaps a little background would be useful.
The engineer was hired to find a solution to a storm water run off problem. You can use your imagination to form a picture of a suburban property where erosion and other factors combine to change the topography over a period of fifty years. Errors in judgement during construction become magnified. Surrounding properties make changes with ripple effects.
The solution involved digging, routing water to new storm sewer inlets, and then holding it all in place. That’s where the GeoWeb comes in. The purpose is to hold a sand/gravel mixture in place while storm water flows on either an additional layer of gravel or thin layer of sod.
It arrived packed flat. Six or so inches wide with a pattern of holes. Odd. It was only after installation that it began to make sense. Stand it on edge. Pull it out like accordion folded paper. Now I understand.