The day after all that hoe work in the rain, I improved two of the rain grooves into full fledged
waterbars. It took about 3 hours to do both features.
This is after using the Merry Tiller to scarify the area. Even though the road is very well compacted, the tiller easily dug to about 2 inch depth. It is important to use a Merry Tiller here. An ordinary garden tiller will hurt itself. But with the Merry Tiller, you don't need a backhoe, nor a lot of pick and shovel work.
I'm a Merry Tiller fan. The times are 1/8 inch steel and the double reduction chain drive gives you torque to turn up 6 inch rocks and 1 inch stumps.
At this point:
- All the loose tillage has been pulled downhill into a 4 inch tall mound with rake and hoe,
- The resulting hole has been filled with 10 gallons of 67 grade gravel.
67 (aka sixes and sevens) gravel has no fines, so it makes good drainage. Water slips right through the gaps.
This is the view after compaction. The mound is now about 2 inches. It's a water bump, not a speed bump. The gravel is packed tight to minimize dispersion by car tires and catching of bike tires. Weak water flow from the left drops into the gravel and filters downhill into the ditch (up in the photo). Strong water flow overshoots the gravel but pools behind the bump, and still flows into the ditch.
This is the one on RTR east side, diverting Shadowwood water into Fran's woods.
Followup 2021: This silted up and needed to be redug in a year. Some people disliked the bump. The whole idea became less important after that stretch was crowned with a box blade, purchased Jan2020.
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