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  1. petervb

    sloping gravel driveway

    For GeoEnvGuy-- is there standard practice for sizing of granite gravel for a particular slope? 8% in this case.
  2. petervb

    sloping gravel driveway

    Thanks to all of you for the excellent advice. Mostly. The explosives idea is too far out; I don't have a government budget! to oldestguy-- can you run a 25T gravel truck up that paved drive? I still have 2000 ft to maintain. I had thought of pavement, my neighbor did that, but he is...
  3. petervb

    sloping gravel driveway

    I have a problem driveway that is constantly eroding. Every year or so, part of a 2500 ft long driveway erodes, especially at a high slope area. Most of the drive is manageable with diversion swales sending water off the road. in one spot though, two conditions are a problem: high slope...
  4. petervb

    need a two pole solid state relay for 220volt?

    Thanks compositepro and itsmoked for the advice. However, itsmoked you are disagreeing about the number of SSR's! compositepro says 2 SSR+ relay, you say 1 SSR + relay. why? If its normal can you refer me to an example.
  5. petervb

    need a two pole solid state relay for 220volt?

    I'm designing a controller for a small process heater, switching 220volts at 20amps. Since the controller uses a ramp/hold pattern with a lot cycles, an SSR is recommended for reliability. Question is: should it have a two pole relay? the 220volt is the north american "two phase" system...

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