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  1. EngrInfo

    Change in Well Water Quality

    I've seen water quality changes in domestic wells mostly after an earthquake, especially in areas where wells are drilled in hardrock formations.
  2. EngrInfo

    Concrete pipe

    Back in the mid 1990's while working as a regulator in California, we had frequent occurances where the plastic service lines that were in areas of petroleum contamination often gave a gasoline or fuel smell to the drinking water. I was told that some plastic pipe (I'm assuming to be HDPE) can...
  3. EngrInfo

    Arsenic in Distribution Systemsà

    Last week an engineer from USEPA in Cincinnati, OH confirmed a grown concern of mine with arsenic in water distribution systems that needs further discussion. First a little arsenic background: • US recently adopted a lower standard for arsenic in drinking water from 50 ppb to 10 ppb. •...
  4. EngrInfo

    de-ozonation for treated potable water

    c4eng Keywords are "least costly and safe". Considering the surface water aspect, the thing to consider is water quality and source protection. What appears to be good one day may be a highly turbid water with embedded cryptosporidium or giardia the next day after a rain. Even...
  5. EngrInfo

    Chlorine generator for pool/spa treatment

    You are talking about a salt-water pool using a salt-water chlorinator. These system typically require the addition of salt to the pool or spa to where the salt residual is somewhere around 1500 to 2500 mg/l depending on the manufacturer. If you want to make your own chlorine generator check...
  6. EngrInfo

    Detention tank design for water

    It all comes down to the velocity gradient of the fluid and the minor losses as the water flows through the tank. You can then use Bernoulli's equation to estimate the headloss. Instead of baffels, consider using plastic media in the detention tank to increase mixing. Depending on the type of...
  7. EngrInfo

    de-ozonation for treated potable water

    As mmenarry states, ozone has a very short residence time and would speculate that litte to no ozone would be available at the two connections. This is groundwater correct? Otherwise if you are supplying surface water to the resident, you have many other things to consider.

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