DAYTON TO SPEND $4,000,000 FOR WATER WORKS IMPROVEMENTS
Report of Leonard Metcalf on the Necessary Water Supply Additions to Meet the City’s Future Growth—Probable Adoption
A PROGRAM for water works improvements involving over four million dollars has been recommended for Dayton. Ohio, by Leonard Metcalf, consulting engineer of Boston. Mass. This large expenditure will be necessary in order to meet the rapidly growing population of the city. The present population, according to Mr. Metcalf’s estimate is 168,500 and of the greater Dayton 188,000. The population of greater Dayton in 1970 is estimated to reach 500,000. The water consumption during the last year was 94 gallons per capita—17,000,000 gallons daily. The present supply is ground water from the Mad River Valley taken by means of 139 wells and a filter gallery. The available sources of additional supplv have been studied carefully. The surface waters are polluted to such an extent as to require filtration and chlorination. The ground water supplies are generally uncontaminated but require chlorination to safeguard potability Mr. Metcalf’s report continues in part:
“All of the supplies are hard. No city in the United States with a population equal to or greater than Dayton has a public water supply with a higher degree of hardness than the Dayton supply. The extreme hardness has led to the very general installation throughout the city of rain water cisterns at the individual homes and in a few cases to water softeners. “Investigation and house-to-house canvass of about 2,000 typical homes, constituting 5 per cent, of the total number in the city, indicated that 93 per cent, of the houses in the city are supplied with dual water systems. They have probably cost their owners in the aggregate substantially over $4,000.000. In other words the citizens of Dayton have probably paid for their dual soft water supplies half as much as the entire cost to them of their entire water supply system—a tremendous burden. The aggregate annual cost of operating these rain water supplies is probably at least $600,000, of which half is operating costs and the other half interest and depreciation charges.
“The most available sources of water supply are the Mad, Miami and Stillwater Rivers. Their drainage areas are 679, 1162 and 674 square miles respectively. The most advantageous is the Mad River, owing to adaptability, proximity and low cost of development. The ground water supply is from 10 to 15 degrees Fahrenheit colder than would be a surface supply during the summer months.
“The additional water supply can be developed the most advantageously by group well pumping stations on the Mad River, delivering into an 84-inch reinforced concrete collecting conduit laid in such manner as to make possible its extension and development of a gravity supply by infiltration galleries above Huffman dam.
“The construction cost of a softening and filter plant of 30 million gallons a day capacity would be $900,000. The annual operating costs, depreciation allowance and interest charges would be so increased (by the sum of $350,000) as to necessitate an increase of about 75 per cent, in the rates for metered water service.
“Should the city continue to carry a portion of the water debt by general taxation, or instead of this make available to the division of water compensation for the public fire protection service, no increase in rates will be necessary. If, on the other hand, the city should prefer to make the water user bear the entire burden of the public fire protection service an increase in rates of about 10 per cent, might prove necessary within the next few years.
The recommendations which Mr. Metcalf makes are as follows:
- —More frequent and routine cleaning of supply wells.
- —Increase in the water supply by at least 20 million gallons a day before 1930 by the construction of four-group well pumping stations with these appurtenances:
- Purchase necessary rights-of-way and land.
- Construction of a reinforced concrete collecting conduit 84 inches in diameter, two and a half miles from the suction reservoir at Ottawa Street to serve two-group well pumping stations north of Eastwood park; the extension of this conduit 1,500 feet in 1927 to a third station and 1,800 feet to a fourth station in 1929.
- Construction of necessary eight-inch to 30-inch cast iron suction and discharge mains to serve the well group pumping stations.
- The sinking of wells 45 or more feet in depth to develop a safe capacity of 12 million gallons per day in 1925; eight million gallons per day in 1927 and five million in 1929.
- The group well pumping station, should be equipped with motor, driven centrifugal units of five million, gallons a day capacity, or there abouts. depending upon the yield of the well groups.
- —The purchase is recommended of the water and other right, of the Dayton Hydraulic Company upon Mad River and such portion of its real estate as may be necessary and can be obtained advantageously.
- —The remodeling, enlarging and improving of the steam power pumping plant at Keowee Street is recommended. This will comprise:
- The construction of a railroad side track.
- The construction of a 72-inch reinforced concrete suction conduit from the suction storage reservoir to the pumping station with cast iron pipe loop connections.
- The reconstruction of the cast iron discharge pipe system for both low and high service.
- The moving of the engineer’s house.
- The rebuilding and enlarging of the Keowee Street pumping station building.
- The installation of a six million gallon a day high service pumping unit in 1925 and of a similar unit in 1927 or sooner.
- Moving the old three-million gallons a day Platt high service pump to a new foundation and abandoning the out-grown motor driven units.
- The installation in 1930 or before, of a new 20-million gallons a day high duty low service pump.
- The installation of two new high pressure water tube boilers of 500 horse nower each with appurtenances.
- —The construction in 1925 of an additional low service reservoir having a capacity of ten million gallons with connecting supply main, and of another such unit before 1930.
- —The construction in 1925 of a high service standpipe of 1,000,000 gallon capacity on Tate’s hill, with a connecting supply main, and in 1930 of another similar unit to supply the southwestern part of the city.
- —The construction of a new high service supply main of 24-inch cast iron pipe in the year 1926 or earlier, and connection of the old 20-inch main now serving the southeasterly high service district, to the low service.
- —The betterments estimated include annual allowance of $95,000 for extension of mains and the necessary allowances for services ami meters.
- —The total cost of the betterments proposed for the years 1924-1930 aggregate the sum of $4,474,000.
- —To cover these costs there will be needed authority to issue the following bonds:
- —Promp: decision should he made as to the betterments to he undertaken in order to give ample time for the preparation of plans and specifications and the letting of advantageous contracts covering the work to be undertaken.
Two million, seven hundred thousand dollars in the year 1924.
Five hundred thousand dollars in the year 1927.
One million dollars in the year 1929.
The difference between this sum and the total cost of the improvement will come from the net earnings of the works.