Proposed Improvements for St. Paul Water System
A number of improvements to the St. Paul, Minn., water system are being proposed by Superintendent Garrett O. House, who hopes to increase the storage capacity at Lake Vadnais about 175,000,000 gallons and to arrange the reservoirs there so that the plant life that now gets into the water may be eliminated before the water is served in St. Paul homes. He says the water contains no deleterious bac_____eria whatever, but that the water should be treated if it is to be rid of the results of plant growths in the lakes which are in evidence in the spring and in the fall.
At first Superintendent House thought the sediments might be screened by a device installed at the Vadnais outlet conduit. An experiment of screening on a small scale was tried, but was not satisfactory. St. Paul draws its water supply directly from Lake Vadnais. It runs directly into the mains from the lake. Superintendent House has planned a large dredging project at Lake Vadnais. What is known as the west arm of the lake is a sort of reed meadow, covered with water at times. It is cut off from the main lake by a strip of land. It is proposed to build a retaining wall 12 feet high around the west arm, and dredge out the lake bottom and deposit the material just outside the retaining wall. This would make a drive three miles long about the west arm, and would give a reservoir 12 feet deep which would hold 175,000,000 gallons of water, ten days’ supply for the city. Copper sulphate treatment would be given the water in the main part of the lake, and water would then be carried through to the clear water reservoir created in the west arm. Superintendent House estimates that the whole project would cost $150,000. This project should be undertaken at once, he says. It could be finished next season and be in use in about a year from this time. Superintendent House also proposes to install a 15,000,000 gallon pump at the McCarron’s lake station. This will cost about $96,000. He also suggests a storage reservoir at McCarron’s Lake of a capacity of about 62,000,000 gallons, to cost about $261,000. Still another project is a high service reservoir at Dale’ street. The reservoir at that point at present is of only 16,000.000 gallons capacity, about one day’s supply for the city high service in dry periods of summer. It is purposed to build an additional reservoir of 40,000,000 gallons capacity. This would cost $163,000.