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  1. cjohnson

    Water well pumping test - proportional flow valves

    Needed..recommendation as to type, distributor, etc. of proportional flow valves for use in water well pumping tests. Valves will be used to more accurately control the flow from the wells, hopefully reducing flucuations in flow, which complicate data analysis. Flows of up to 25 GPM out of 1...
  2. cjohnson

    Change in Well Water Quality

    I suspect two possible "explanations" to the emerging presence of SRB occurring in well. The lightening strike either created a condition where two waters are now mixing, when previously you had a single water source. Or the lightening strike altered the chemistry of the well...
  3. cjohnson

    Relief well - allowable seepage velocity

    Patrick, Well, better late than never. Sorry, I was out of the country for awhile, away from anything resembling a computer. Seepage velocities can be calculated for earthen retaining structures, up to and including the maximum velocity. Above this maximum the risk of piping becomes...
  4. cjohnson

    Relief well - allowable seepage velocity

    Patrick, Still interested in an opinion?
  5. cjohnson

    Coppermine: tailings disposal facility leakage problem

    Depending upon many variables, yes this does sound like quite a lot of leakage. The size of impoundment, evaporation rates, type of bedrock, etc. will all affect the significance of such a leak. Regardless, this is still a good deal of water, and represents a potential loss of recoverable...

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