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A Gradual Rehabilitation Programme for Combined Sewerage Systems
Author(s) -
KIRYU T.
Publication year - 1994
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.1994.tb01139.x
Subject(s) - sewerage , sanitary sewer , stormwater , rehabilitation , flooding (psychology) , flood myth , civil engineering , environmental science , environmental engineering , engineering , water resource management , environmental planning , surface runoff , geography , psychology , ecology , archaeology , neuroscience , psychotherapist , biology
The Kannai‐Yamashita district, which is Yokohama's administrative and economic heart, was the first part of the city to be installed with a modern sewerage system. This district is served by combined sewers, many of which have extensive pipe deterioration, shallow covering, and insufficient capacity. Whilst rehabilitation of these sewers has therefore been an urgent priority, flood alleviation has been given even greater precedence. It was consequently decided (a) to construct supplementary storm trunk sewers and a stormwater pumping station to mitigate flooding, and (b) to implement a systematic rehabilitation of the sewers on a gradual basis. Studies of branch sewer rehabilitation also used a surcharge model in the interest of achieving an economical and efficient design.