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By Cassels J. W.

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The wagons when loaded gave 750 Ibs. pressure viously lin. , per heavy teams traveling wherever they could do the most effective work compacted the materials better even than the the rollers. Several test pits which were dug into the dam during construcshowed that there were no distinct lines traceable between tion mass was the layers and no loose or dry spots, but that the whole solid A the and homogeneous. careful record Tabeaud Dam. , with 90 ft. depth of water in the reservoir. Water was first turned into the reservoir five months after the dam was finished.

Into the embankment where the pressure was applied, while outside of this area the rod was easily pushed to the bottom of the tank. These results corroborate in a general way the practical experience of the author, both in compressed embankments, where he found it necessary to use a pick vigorously to loosen the material of which they were composed, and in embankments made by mere- *This work is very fully described in the Annual Reports of the Metropolitan Water Board of Boston: and by Mr. F. P.

N The face puddle shown in Fig. was used merely to "make assurance doubly sure" and was not carried entirely up to the top of the dam. The earth of which the dam was constructed mav THE TABEAUD DAM. 25 be described as a red gravelly clay, and in the judgment of the author is almost ideal material for the purpose. Physical tests and experiments made with the materials at different times during gave the following average results construction : Pounds. Weight of cu. ft. 5 dam. 0 Per Percentage " of moisture in natural earth " voids in natural earth " grit and gravel in natural earth u 19 52 38 compression on dam over earth at borrow-pit " compression on dam over earth in wagons Angle Angle Angle cent.

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Global Fields by Cassels J. W.


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