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A portion of the 15.3
kilometer tunnel excavated. Tunnel alignment had been carefully designed to
pass for its entire length under state owned land to avoid long talks and
expensive agreements with landowners. Tunnel lining consists of a watertight
one pass segmental lining with a 26 mm EPDM gasket plus an external foam
gasket. The lining comprises five segments and one key, with only longitudinal
joints bolted. Lining life is contractually fixed at 100 years. Access shafts
shown below are used for construction purposes; three of the five will be used
for future connections and two raising stations for the distribution of potable
water. |
