backwater valve flow reduction?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by ctreefer, Sep 19, 2012.

  1. ctreefer

    ctreefer New Member

    Sep 11, 2012
    I want to install a backwater valve on our footing drain in the basement. We have a groundwater issue and on top of that during high rainfall rates the storm drain where the footing drain empties into can backup into the house. (last year while on vacation we got 6" in the basement after some heavy rains)
    the drain is currently 4" PVC. I'm a little concerned that by adding the valve it may restrict some of my flow but I can't find any data on that. (In the spring during snow melt and heavy rain that pipe can max out as it is.)

    If it would cause a restriction is there something else I can do to prevent that?
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    A properly installed valve will not restrict the flow, but it may not always prevent the backup, either. They are prone to back leakage when anything gets into or on the seat and then they become ineffective for preventing a flood.
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