LIFE SPAN OF AMERICAN PIT BULL TERRIER. HISTORY. Sometime during the nineteenth century, dog fanciers in England, Ireland and Scotland began to experiment with crosses between Bulldogs and Terriers, looking for a dog that combined the gameness of the terrier with the strength and athleticism of the Bulldog.
Bridge enclosure is a structural floor suspended from the soffit of steel composite, plate. girder or concrete bridges. The floor and integral side membranes can be formed in. advanced composite materials which encapsulate the structure and provide permanent.
Dam Safety-Glossary of Terms. ABUTMENT-The part of a valley side (wall) against which a dam is constructed. An artificial abutment is sometimes constructed as a concrete gravity section, to take the thrust of an arch dam where there is no suitable natural abutment.REST WIDTH-The width or thickness of a dam at the level of the crest of the dam. In general, the term thickness is used for gravity and arch dams and width is used for other dams. CRIB DAM-A gravity dam built up of boxes, cribs, crossed timbers, or gabions and filled with earth or rock.