Compare to Traditional Drainage
Simple Math: 120 inches vs. 4 inches. Which is the larger number?
i. Each linear foot of a HydroBlox board offers 120 inches of surface area that can intake water.
ii. Each linear foot of a 4” French drain pipe only has 8 small holes that can intake water. That’s only 4 inches of surface area vs. 120 inches.
French drains rely on slope and a big trench filled with gravel with a pipe near the bottom of the trench. Trenches are usually at least 2 feet deep and 6 to 8 inches wide.
Water fills from bottom up into small holes in the bottom of a pipe. There are 8 holes, 1/2” in diameter, per 1 ft. of pipe.
Doing the math, that means only 2.7% of the surface area of the (4”) pipe can intake water.
Worse, that means that all the work to dig a big trench filled with many wheelbarrows of gravel is just to facilitate water seeping into a few small holes.
That’s extremely inefficient. But, it was innovative in 1859