Hetch-Hetchy供应旧金山。
加州旧金山的公民,有投票for bringing water from the Tuolumne river in the Sierra Nevada mountains, 142 miles east of the city, and the water will reach them through 180 miles of conduits, tunnels and pipes. Bonds to the amount of $750,000 have been voted to pay for the preliminary work, and the total cost of this new municipal system may be between $40,000,000 and $50,000,000. If the city purchases the plant of the Spring Valley company and uses the Tuolumne system merely as an auxiliary, a new distributing system will not be needed. In any case the Tuolumne system must be built within a few years, as the company’s sources of water are altogether inadequate and in a few years will be of doubtful purity. As has been already stated in a former article, the Tuolumne system contemplates the construction of reservoirs in the llctch-lletchy valley on the Tuolumne river and at lake Eleanor on the creek of the same name. These reservoir sites have a drainage-area of 630 sq. mills of rocky, glacial and uninhabitable territory in the Yosemite National park. This drainagearea lies along the slopes of the Sierra Nevada mountains, rising in height from 4,700 to 12,000 ft. above sea-level. At the lower end of the Hetch-Hetchy valley is a granite gorge, with very precipitous sides and offering a most appropriate site for a dam. The valley is about 5½ miles wide, with sides so steep as to be practically impassable. It is estimated that a dam 250 ft. high would cost about $1,000,000. Lake Eleanor lies about 4 miles northwest of Hetch-Hetchy and is about 400 acres in extent. It is fed by several glacial streams, and a granite gorge offers an admirable site for a dam. This dam will be 200 ft. high and will cost $1,000,000. The waters from these two reservoirs will run along' natural channels for about 14 miles to where the Tuolumne river and Eleanor creek meet. Here a diverting dam will be constructed, and the conduits, tunnels and pipes that will carry the water to San Francisco will begin. From the diverting dam the water will be carried in canals and tunnels for 30 miles to the Bear gulch power station. Here a fall of more than 700 ft. is available and 12,000 horsepower can be produced. From the Bear gulch station the water will be carried in canals for 14 miles to the Dry Creek power station, where a fall of about 300 ft. is available and 4,500 horsepower can be produced. From this power station the water will be delivered into tailracecontrollingrcservoirs, thence into two 48-in. mains that will cross the San Joaquin valley. These pipes will be 60 miles long and will be capable of carrying 60,000,000 gal. of water a day. This pipe line will cost about $7,000,000. The water will be delivered from these mains into a reservoir at the AJtamont pumping station. Electrically driven pumps will force the water into an immense pressure reservoir, where it will start on the last lap of the journey to San Francisco. The power for the pumps will be secured from the Bear gulch and Dry creek stations: but an auxiliary steam plant will be provided. From the Altamont reservoir two 48-in. mains 70 miles long will conduct the water to service reservoirs at the San Francisco city limits. These reservoirs will have a capacity of 200.000,000 gal. and the system will deliver 60,000,000 gal. daily. It is estimated that it will cost about $32,000,000. If, however, the Spring Valley System is acquired, it will only be necessary to bring from Tuolumne 30,000,000 gal. a day, and this can be done for about $20,000,000. A city distributing system would cost about $12,000,000. The municipality would have to lay about 650 miles of mains and laterals and construct twenty-two reservoirs. The cost of an entirely new and independent system would amount to about $44,000,000 and would take ten years to build. It is believed that the Spring Valley properties can be acquired for $30,000,000. If the Spring Valley system is purchased, a complete water system will cost about $51,000,000, including the $20,000,000 for the I uolumne project as an auxiliary supply, but would save several years’ time.
加州旧金山的公民,有投票for bringing water from the Tuolumne river in the Sierra Nevada mountains, 142 miles east of the city, and the water will reach them through 180 miles of conduits, tunnels and pipes. Bonds to the amount of $750,000 have been voted to pay for the preliminary work, and the total cost of this new municipal system may be between $40,000,000 and $50,000,000. If the city purchases the plant of the Spring Valley company and uses the Tuolumne system merely as an auxiliary, a new distributing system will not be needed. In any case the Tuolumne system must be built within a few years, as the company’s sources of water are altogether inadequate and in a few years will be of doubtful purity. As has been already stated in a former article, the Tuolumne system contemplates the construction of reservoirs in the llctch-lletchy valley on the Tuolumne river and at lake Eleanor on the creek of the same name. These reservoir sites have a drainage-area of 630 sq. mills of rocky, glacial and uninhabitable territory in the Yosemite National park. This drainagearea lies along the slopes of the Sierra Nevada mountains, rising in height from 4,700 to 12,000 ft. above sea-level. At the lower end of the Hetch-Hetchy valley is a granite gorge, with very precipitous sides and offering a most appropriate site for a dam. The valley is about 5½ miles wide, with sides so steep as to be practically impassable. It is estimated that a dam 250 ft. high would cost about $1,000,000. Lake Eleanor lies about 4 miles northwest of Hetch-Hetchy and is about 400 acres in extent. It is fed by several glacial streams, and a granite gorge offers an admirable site for a dam. This dam will be 200 ft. high and will cost $1,000,000. The waters from these two reservoirs will run along' natural channels for about 14 miles to where the Tuolumne river and Eleanor creek meet. Here a diverting dam will be constructed, and the conduits, tunnels and pipes that will carry the water to San Francisco will begin. From the diverting dam the water will be carried in canals and tunnels for 30 miles to the Bear gulch power station. Here a fall of more than 700 ft. is available and 12,000 horsepower can be produced. From the Bear gulch station the water will be carried in canals for 14 miles to the Dry Creek power station, where a fall of about 300 ft. is available and 4,500 horsepower can be produced. From this power station the water will be delivered into tailracecontrollingrcservoirs, thence into two 48-in. mains that will cross the San Joaquin valley. These pipes will be 60 miles long and will be capable of carrying 60,000,000 gal. of water a day. This pipe line will cost about $7,000,000. The water will be delivered from these mains into a reservoir at the AJtamont pumping station. Electrically driven pumps will force the water into an immense pressure reservoir, where it will start on the last lap of the journey to San Francisco. The power for the pumps will be secured from the Bear gulch and Dry creek stations: but an auxiliary steam plant will be provided. From the Altamont reservoir two 48-in. mains 70 miles long will conduct the water to service reservoirs at the San Francisco city limits. These reservoirs will have a capacity of 200.000,000 gal. and the system will deliver 60,000,000 gal. daily. It is estimated that it will cost about $32,000,000. If, however, the Spring Valley System is acquired, it will only be necessary to bring from Tuolumne 30,000,000 gal. a day, and this can be done for about $20,000,000. A city distributing system would cost about $12,000,000. The municipality would have to lay about 650 miles of mains and laterals and construct twenty-two reservoirs. The cost of an entirely new and independent system would amount to about $44,000,000 and would take ten years to build. It is believed that the Spring Valley properties can be acquired for $30,000,000. If the Spring Valley system is purchased, a complete water system will cost about $51,000,000, including the $20,000,000 for the I uolumne project as an auxiliary supply, but would save several years’ time.
