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The filtration of public water-supplies / Third edition, revised and enlarged. cover

The filtration of public water-supplies / Third edition, revised and enlarged.

Chapter 107: COST OF CONSTRUCTION.
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About This Book

This book presents a practical, engineering-focused treatment of water filtration for municipal supplies, combining historical perspective, design principles, and operational guidance. It explains types of filters, construction of beds and underdrains, selection and grading of sands and gravels, rates of filtration, head loss, and mechanisms for regulating flow. Procedures for cleaning, sand-washing, and intermittent operation are described alongside theoretical and bacteriological considerations that bear on efficiency. Methods for measuring and removing turbidity and color, the effects of suspended mud, coagulation practices, and numerous design examples and appendices illustrate how to plan, build, and maintain effective filtration works.

COST OF CONSTRUCTION.

The approximate cost of the filtration-plant complete was as follows:

Land $8,290

Pumping-station and intake

49,745

Filters and sedimentation-basin, with piping

323,960

Pure-water conduit and connection with Quackenbush Street pumping-station

86,638

Engineering and minor expenses

28,000
Total $496,633

The filters, sedimentation-basin, and pure-water reservoir are connected in such a way as to make an exact separation of their costs impossible; but, approximately, the sedimentation-basin cost $60,000, the pure-water reservoir $9,000, and the filters $255,000. The sedimentation-basin thus cost $4,100 per million gallons capacity; and the filters complete cost $45,600 per acre of net filtering area, including all piping, office and laboratory building, but exclusive of land and engineering.

ACKNOWLEDGMENT.

The general plan and location of the plant were first conceived by the Superintendent of Water-works, George I. Bailey, M. Am. Soc. C. E., and the successful execution is largely due to his efforts. The members of the Water Board, and especially the Construction Committee, have followed the work in detail closely and personally, and their interest and support have been essential factors in the results accomplished. In the designs and specifications for the pure-water conduit the author is greatly indebted to Emil Kuichling, M. Am. Soc. C. E., and also for most valuable suggestions relative to the performance of this part of the work. To William Wheeler, M. Am. Soc. C. E., of Boston, the author is indebted for advice upon the vaulting and cross-sections of the walls, and these matters were submitted to him before the plans were put in final shape. All the architectural designs have been supplied by Mr. A. W. Fuller, of Albany. W. B. Fuller, M. Am. Soc. C. E., as Resident Engineer, has been in direct charge of the work, and its success is largely due to his interest in it and the close attention which he and the assistant engineers have given it.