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Examples of Training-Walls.
ENTRÄNGE CHANNELS.
Remarks. 'c « 1C1V V 111V11VO < v iv»» »»uiuva to allow for extension of tidal water, and to ensure against dam- age by waves and ice. Walls carried up to high-water level, 6| feet wide at top. Slopes 1 to 1 on land side and 1J to 8 to 1 on river side, according to current. Sectional area of mound, 12J square yards. Side slopes, 2 to 1. Base width about 30 feet. Sectional area of mound, 26 square yards. Side slopes, 1 to 1. Fin- ished height about 5 fect above original surface.
Cost. Mattress work, 6s. 2d. per cubic yard ; brush work, 4s. 7jd. Large stone. 9s. 3d. : small stone, 7s. 5Jd. 3s. 9d. per cubic yard for materials ; 2s. 8d. for labour = 6s. 5d. total. Stone, 6s. 8d. per cubic yard. Stone. Is. lid. ner cubic yard, 4s. 9d. per cubic vard. Is. 4Jd. per cubic yard. 2s. 9d. per cubic yard. lOJd. per cubic yard. per ton for removing Itheir slag.
8 G 1 li miles. 43 miles. 34 miles. 24 miles.
Method of Formation. Slung during construction from overhead staging and deposited.; Weighted with stone. Made and towed 6 miles to destina- tion by tugs. Sunk in position and weishted with stones. Tirroed from barses and levelled to an even face above low-water line. Deposited bv hoppers and trimmed. Discharged from barges by hand. Discharged from barges by hand. xyioviicLigcvi ui^piug il vin iivp^vx barges and also by hand from keels and punts.
Material. Fascine mattresses about 60 feet x 15 feet x 4 feet to 7 feet thick. Fascine mattresses, 66^ feet x 33^ feet x 3^ feet, bound bv eralvanised wire. Chalk rubble from ad- jacent cliffs. ; o S 00 = I Wales. (0 Slag. Slag from local iron-
Tionalitv. Tampico, Mexico. niver w eser ironi Bremen to sea. Seine Estuary. i 2 Tees Estuary.