Quote:
Originally Posted by John Mercier
Lawns provide less natural filter than other formats.
It is the same at my house as it would be if I was lakefront.
The water can travel through them at a greater speed, and thus has less absorption in an incline.
Also if you do not fertilize a lawn, or allow it to grow much longer, it loses its mono-culture.
It is that loss of mono-culture that allows the turfgrass to sustain itself without the addition of fertilizer.
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John is right: "grass" or lawns have much shallower root structures than native shoreline vegetation, are therefore far less efficient filters, and make for more runoff.