KAIKORAI VALLEY DRAINAGE.

Otago Daily Times, Issue 19000, 24 October 1923, Page 4

KAIKORAI VALLEY DRAINAGE.

POLLUTION OF THE DISTRICT. NEW MAIN REQUIRED. Dealing with the Kaikorai Valley drainage Mr M‘Curdle, city engineer,_ submits the following suggestions for an improved service: .. A great deal of water from the Kaikorai Valley slopes in Maori Hill, Roslyn, and Morningtoii finds its way into the sewers. These sowers aro all built on the separate system, (hat is, they aro not expected to allow rain water to enter; but in wet weather they admit more rain than the main sewer will carry. This water has then to be run into the Kaikorai Creek, sewage and all. Complaints come from the Borough of Green Island ami farmers down the Valley object to the pollution. If not run into the Kaikorai Stream it lifts some of the manhole covers and overflows the road and adjacent land. At the same time part comes through the old railway tunnel and floods premises off Cargill road. It formerly flooded premises in Oaversham, lint this has been remedied by the council. To put a stop to this trouble, it is necessary to carry a main down the Valley through the Green Island Borough to a point between the late toll-bar and Mr Peter Cameron’s premises. This main should be made sufficient to carry' all the polluted water from the manufacturing premises in the Valley as well as all the sewage from the Kaikorai slopes of Mauri I-1 ill, Roslyn, and Morningtoii. From the point below the toll-bar a tunnel should bt> driven through the ridge to Black Head. The rock all the way is sandstone and marl, material easily bored ‘ and requiring Idtde or no lining, except in the bottom. The purifying of the Kaikorai Creek and the drainage of the whole Valley will thus be provided for without any pumping. The cost of this work will he about £60,036. It is not sot down in the list of recommendations, as the. funds siiculd bo found by the traders in the Valley, the Borough Council of Green Island, and the Dunedin City Council by agreement. The problem has long been under close study, and will be promptly dealt with as soon as public sentiment is ripp: It is a reform already long overdue. It is a grievous wrong that premises off Cargill road should be flooded with storm-water and sewage from Maori Hill, etc.