aboiteaux
a. Dike and drainage structure protecting marshlands; b. Outlet structure with flap gate which permits outflow of fresh water, but prevents inflow of tidal salt water (no longer in common use).
Authorization Path: 2.4.5.2.20.15
a. Dike and drainage structure protecting marshlands; b. Outlet structure with flap gate which permits outflow of fresh water, but prevents inflow of tidal salt water (no longer in common use).
Authorization Path: 2.4.5.2.20.15