"Doug Dotson" dougdotson@NOSPAMcablespeedNOSPAMcom wrote in message
news:97WdnQDGHfCd_nXcRVn-
How does having this configuration have any advantage? I've never
seen a lock like this.

Doug
s/v Callista

Half the time the water is higher on the lake side (low tide in ocean) and
then it's higher in the bay end (high tide in ocean)
see http://www.jimthompson.net/brasdor/ St. Peter's Canal