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Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project
No full textDocument: "Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project" December 1963, page 9Gas and Electric Company; the California Electric Power Company; Imperial Irrigation District; and the Bureau of Reclamation. The energy is produced at several hydroelectric plants within or near the market area, in addition to large steamplants located near the load centers. Hoover, Davis, and Parker Powerplants on the Colorado River form a major source of supply. Hoover Dam Powerplant is operated for the Bureau of Reclamation by the city of Los Angeles and the Southern California Edison Company, and Parker Dam and Davis Dam Powerplants by the Bureau of Reclamation. The cities of Pasadena, Burbank, and Glendale operate municipally owned steam and hydroelectric plants, and the Imperial Irrigation District owns and operates steam and hydroelectric plants and distributes energy in the Imperial and Coachella Valleys. Most of the power systems of these agencies are interconnected, but integration of their operations is, in some cases, limited by existing facilities.
In Arizona, the principal agencies generating and distributing electric power are the Salt River Project Agricultural Improvement and Power District; the Arizona Public Service Company; the Tucson Gas, Electric Light and Power Company; Citizens Utilities Company; Arizona Electric Power Cooperative; the Bureau of Indian Affairs; and the Arizona Power Authority.
In general, these agencies serve the more densely populated areas in the south-central part of the State. The Bureau of Reclamation, by virtue of the power delivered from Hoover, Davis, and Parker Powerplants, is a large producer and distributor of electric energy utilized in the State.
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Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project
No full textDocument: "Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project" December 1963, page 14CHAPTER II
PLAN OF DEVELOPMENT
The development of the Marble Canyon Project would include the construction of Marble Canyon Dam and Powerplant, transmission facilities, the Paria River Dam, and other related features. Owing to the inaccessibility of the inner gorge, the initial activity would be the construction of access roads and of community facilities for the workers and their families at the Marble Canyon Dam site. The construction of the dam, powerplant, transmission system, and the Paria River Dam would follow in sequence. Drawing No. 788-300-61 shows the locations of the Marble Canyon and Paria River features. The Paria River sediment-retention dam would alleviate the sediment problem at Marble Canyon Reservoir for over 100 years.
Climatological Factors
Precipitation at the Marble and Paria Dam sites and on the adjacent plateaus averages about 7 inches a year, most of which occurs in the form of short-duration cloudbursts during July and August. May and June are usually the driest months of the year. Snowfall at the damsites is infrequent and light, averaging about 10 inches annually. However, at Flagstaff, Arizona, the nearest railhead which is about 100 miles south, the annual snowfall averages 68 inches.
Temperatures adjacent to the damsites range from a low of 12 degrees to a high of 117 degrees Fahrenheit. On the plateau the temperatures average 14 degrees less than those on the inner gorge rim of Marble Canyon Dam site.
Winds on the plateaus may on occasion reach high velocities, particularly in the winter and spring months.
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Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project
No full textDocument: "Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project" December 1963, page 18750 feet at elevation 3,150 feet. It would have a structural height of 415 feet, of which 105 feet would be below the streambed.
The spillway and river outlet works would have a combined capacity of 310,000 cubic feet of water per second, which is in addition to the capacity of the powerplant turbines.
The spillway would consist of five 27- by 30-foot openings through the dam at elevation 3,050 feet. Flood discharge up to a maximum of 264,800 cubic feet per second would be controlled by five fixed wheel gates. The spillway releases would cascade down the outer face of the dam into a stilling pool at the toe of the dam. River outlet capacity, totaling 37,500 cubic feet per second, would be provided by four 8- by 12-foot fixed wheel gated openings through the dam at elevation 2,936 feet. Outlet releases would also cascade down the outer face of the dam into a stilling pool.
A single detached 30-foot-diameter diversion tunnel with a capacity of 35,000 cubic feet per second, located around the right abutment of the dam, would convey the Glen Canyon Reservoir releases and tributary flows around the construction site. The tunnel would be permanently plugged upon completion of the dam and powerplant.
The powerplant--A 600,000-kilowatt powerplant, consisting of four 150,000-kilowatt units, would be located underground immediately downstream from the left abutment of the dam as shown on Drawing Nos. 788-D-20 and 21. The underground room would be excavated in the solid rock of the left wall of the inner gorge of Marble Canyon. Four 22.5-foot-diameter penstock tunnels leading from two 32-foot-diameter entrance tunnels would convey a maximum flow of 29,000 cubic feet per second of water to four 213,000-horsepower turbines.
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Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project
No full textDocument: "Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project" December 1963, page 20by motor vehicle. The distance, via U.S. Highway 89, from the railroad terminal yard developed for the Glen Canyon Project, about 5 miles east of Flagstaff, to the turnoff near Cedar Ridge is approximately 88 miles. The remaining 21 miles across the relatively level plateau country is over an unimproved road which provides satisfactory access for any type of vehicle in fair weather, but during occasional wet periods, four-wheel-drive vehicles may experience difficulty. U.S. Highway 89 from Flagstaff, which was improved to accommodate Glen Canyon Dam construction traffic, would be adequate for Marble Canyon construction traffic.
The construction of the 21-mile permanent access highway across the plateau from Cedar Ridge on Highway 89 to the townsite on Tatahatso Point would not involve any unusual construction problems. On the relatively flat plateau, existing or newly bladed roads would provide ready access to any section, permitting construction of the permanent highway to proceed simultaneously on a number of sections. Drawing No. 788-300-61 shows the locations of the access roads.
Owing to space limitations, only minor shops and equipment storage, together with aggregate stockpiling, could be provided on the rim of the inner gorge. Administration, major fabrication plants, and warehouses would need to be located on the plateau adjacent to the top of the outer rim of the canyon. Therefore, the capacity and dependability, as well as costs of the access facilities from the outer rim to the top of the inner gorge, are of major importance. Alternative cableway and inclined railway systems were studied previous to the selection of the road plan.
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Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project
No full textDocument: "Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project" December 1963, page 26hard and is not strongly cemented, yet stands in nearly vertical walls. It is relatively porous, but water will not move rapidly through it owing to the small size of the intergrain voids. This rock is the same formation and comparable to the rock at the Glen Canyon site. The extensive test data on the physical character and behavior of the rock at Glen Canyon are believed applicable to the rock at the Paria River Dam site. The upper part of the reservoir is an erosional valley cut out of the Corral shale and Entrada sandstone. There are no roads in the vicinity of the damsite, and at present access is difficult. No drilling has been done at the damsite, but channel conditions indicate the depth of fill in the stream channel to be from 60 to 100 feet. A detailed foundation exploration program will be required before final desigs are prepared.
The preliminary studies do not reveal any geologic defects of any consequence at the damsite. The Navajo sandstone is considered competent for the proposed dam.
Access facilities and relocation of U.S. Highway 89--The damsite is about 30 miles via U.S. Highway 89 from the nearest town and trucking terminal at Page, Arizona. Construction of about 8.1 miles of road across the relatively flat, but sandy, plateau from the State highway to the damsite would be required. At the damsite, the precipitous nature of the narrow canyon would make roadway construction from the rim to the streambed impracticable. Men and materials could easily be lowered to the work by cableways or hoists, with some use of ladders and stairways, as the dam approaches completion.
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Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project
No full textDocument: "Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project" December 1963, page 31contracts would be for construction of the Marble Canyon access road and construction camp, followed by the Marble Canyon Dam and Powerplant. The Marble Canyon transmission system and Paria Dam and access road would be the final major contracts awarded. Initial reservoir storage would be in the fifth year of construction, with initial power generation the latter part of the following year.
Operation, maintenance, and replacement costs--Annual costs consist of those required for operation and maintenance, including administrative and general expenses, and those associated with replacement of equipment. The following tabulation presents a summary of the annual costs of the principal features of the project. The annual costs for Paria River Dam allow for periodic inspections, routine maintenance, and placing of the outlet stoplogs as required.
Feature Operation and Maintenance Replacement Total
Marble Canyon Dam and Headquarters 12,000 $112,000
Marble Canyon Powerplant 336,000 115,000 451,000
Marble Canyon Transmission System - - 1,215,0001Epson Perfection 4870 Photo, 400 dpi, 8 bit, 2,394,741 byte
Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project
No full textDocument: "Pacific Southwest Water Plan Supplemental Information on Marble Canyon Project" December 1963, page 36Table 3--Derivation of Average Annual Project Costs
Marble Canyon Project
100-Year Period of Analysis
Construction Costs 1Epson Perfection 4870 Photo, 400 dpi, 8 bit, 2,160,032 byte
Pacific Southwest Water Plan - Draft of Report of Commissioner of Reclamation
No full textDocument: Pacific Southwest Water Plan, Draft of Report of Commissioner of Reclamation, December 20, 1963, (foldout) no paginationEpson Perfection 4870 Photo, 400 dpi, 8 bit, 1,701,378 byte
Pacific Southwest Water Plan - Draft of Report of Commissioner of Reclamation
No full textDocument: Pacific Southwest Water Plan, Draft of Report of Commissioner of Reclamation, December 20, 1963, page 23. The first steps in firming Pacific Southwest water supplies to Assure the fullest use of presently available supplies Measures to promote. more efficient water use, water salvage, and renovation of waste water. and reuse should constitute
4. Desalting of Sea Water and brackish Water should be carefully and continually evaluated in relation to the great potential that desalting of sea and brackish water holds as a new source of water supply for the Pacific Southwest.
In additional to this general agreement, a number of excellent suggestions for plan modification were received and have been adopted. There were, of course, some suggestions made that were incompatible or in conflict, one with the other. In view of the wide scope and complexity of the proposed plan and of the number and variety of interests affected, however, the number of such comments was remarkable few. None appear to present problems that defy resolution.
Summary of Pacific Southwest Water Plan as Proposed in August 1963 Report
As a background to a resume of the comments made by the individual States and agencies, a brief summary of the Pacific Southwest Water Plan as presented in the TASK FORCE report of August 1963 is in order.
The August 1963 report presented a new approach to solving the water problems of the Pacific Southwest. It proposed that the old divergent paths be discarded and that a regional apprpach be adopted that would end competitive struggle among States and assure the development of water to meet the burgeoning demands of the next 25 years or until about the year 1990.
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Pacific Southwest Water Plan - Draft of Report of Commissioner of Reclamation
No full textDocument: Pacific Southwest Water Plan, Draft of Report of Commissioner of Reclamation, December 20, 1963, page 5A repayment demonstration was made for the reimbursable portion of Phases I and II construction costs which indicated payout within a period of 50 years after the last features were constructed at 3 percent interest on municipal, industrial, and power allocated components.
In essence, this was the plan on which the States and Federal agencies commented.
Summary of Major Comments Submitted by Affected States Arizona. Governor Fannin expressed general agreement with the regional concept, but emphasized it must not be permitted to delay independent authorization of the Central Arizona Project which is now under consideration in Congress; if the inclusion of Marble Canyon in a separate Central Arizona Project or in any other plan to bring additional water into Arizona will facilitate and result in early authorization and construction, Arizona should agree to its includion; development of additional water for Arizona above and beyond the 1,200,000 acre-feet planned under the Central Arizona Project should be a major objective of the plan; projects in northern Arizona, dependent upon water exchange arrangements and upon direct diversion from Colorado River, should be authorized as soon as feasibility reports are completed.
California. Governor Brown submitted comments which, with respect to broad aspects, strongly support the regional program concept, and indicate that individual projects should be authorized only after agreement by the interested parties on a truly regional approach; the subsidy to municipal and industrial water should be eliminated: the
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