Moondog55 wrote:Do you find an associated culvert on the downhill side of the road?
Moondog55 wrote:Quick small gold mines?
CasualNerd wrote:I think they're just silt collection points along drains where there's a lot of erosion or vegetation falling. Mud and silt collects in the bottom, then only clearer water overflows that into the actual drain and doesn't block pipes going under the road. You sometimes see them behind a haybale or shadecloth screen that further filters the runoff.
ribuck wrote:Could they be drainage test pits? These are dug before work is done on a road, to see how quickly it drains and therefore what kind of additional drainage must be provided. A Google Images search for "drainage test pits" brings up images that look very much like this.
CasualNerd wrote:I think they're just silt collection points along drains where there's a lot of erosion or vegetation falling. Mud and silt collects in the bottom, then only clearer water overflows that into the actual drain and doesn't block pipes going under the road. You sometimes see them behind a haybale or shadecloth screen that further filters the runoff.
Users browsing this forum: No registered users and 12 guests