. L'ingénierie et la passation des marchés. s replacedby un barrage en bois, construit en conformité. withFig 3. Le nouveau travail est un immense timbercrib 200 pi. de long, 68 pieds de large, et 24 m de hauteur, entièrement rempli de pierres et de gravier. Thewhole crib a été construit à la place, stick par stick, et il flottait sur l'eau dans le excavationmade par l'affouillement jusqu'à ce qu'il mis à la terre. Thistimber crib a été étendue le long du reste200 ft. du barrage, de sorte que ce apparaissent-ance est uniforme, et la position relative des andmagnitude les nouveaux et les anciens articles, c'est l'INGÉNIERIE 228-CONTRACTANTES vol. XXXIII. No ID. de la Fig. 4. Comme à propos de

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. Engineering and Contracting. s replacedby a timber dam, built in accordance withFig. 3. The new work is an immense timbercrib 200 ft. long, 68 ft. wide, and 24 ft. high, entirely filled with stones and gravel. Thewhole crib was built in place, stick by stick, and it floated on the water in the excavationmade by the washout until it grounded. Thistimber crib was extended along the remaining200 ft. of the dam so that the external appear-ance is uniform, and the relative position andmagnitude of the new and old sections is 228 ENGINEERING-CONTRACTING Vol. XXXIII. No. ID. shown in Fig. 4. As about one-half of this the base for a height of 32 ft. and in that pro-dim went out and the balance remained un- portion; top to be 40 ins. thick. Batter ondamaged, it is fair to assume either that the water side 5% ins. per foot. The lower side tomaterial under the part that failed was poorer be perpendicular for 12 ft.; above that batterthan that under the balance, or that something of IV2 ins. per toot. On upper side of dam logs. Fig. 3. happened to one part that did not happen tothe other. As during the freshet large quanti-ties of drift passed by, including whole trees, parts of bridges and buildings, the latter maybe the case. It is claimed by some that an oiltank floated over the dam and broke he apron. The second dam was on the Quinebaug Riv-er in the town of Thompson, where the drain-age area is in the neighborhood of 175 squaremiles. No plans of it exist so far as the writerknows. My recollection of it is that there wasno core wall, except a low one to break thejoint between the natural ground and the em-bankment. A highway occupies the top of theembankment. There was considerable seep-age at the foot of the slope and a drain waslaid to carry the water into the river. The following account of this dam is fromProfessor Dwight Potters description of thewater power on streams tributary to LongIsland Sound. At the site of the new dam the river-bed isgravel, with some quicksand

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