This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...be level, but should drain away from the canal. For smaller distributaries or minor private channels a small trapezoidal cross-section both for the bank and the canal will usually be sufficient, and as far as possible the larger portion of this cross-section should be in embankment, thus keeping the water above the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...be level, but should drain away from the canal. For smaller distributaries or minor private channels a small trapezoidal cross-section both for the bank and the canal will usually be sufficient, and as far as possible the larger portion of this cross-section should be in embankment, thus keeping the water above the level of the surrounding country. In such small channels it is not necessary to construct berms, to give subgrades or other complex cross-sections. 245. Wooden Distributary Heads.--Distributary heads on Western canals are arranged much as are the heads of main canals and escapes. They consist essentially of two parts, a regulator or check below the head on the main canal, in order to divert the water into the distributary, and a regulating gate in the latter to admit the proper amount of water. These heads usually consist of a wooden fluming, which is practically an apron to the bed of the distributary and planking to protect the banks. In this fluming are inserted the gates, which consist either of flash-boards, as in Kern County, California, or of simple wooden lifting gates, as in most other portions of the West. In Fig. 75 is shown a distributary head on the line of the Calloway canal in California. Immediately below the regulator is shown a minor headgate leading to a private channel, while a sort of well is formed in the distributary flume just below this minor headgate to retard the velocity of the current. On the line of the Idaho canal the distributary heads are designed much as are the main heads on the same canal (Fig. 75). On the Del Norte canal in Colorado a few of the distributaries are diverted by practically bifurcating the main branch, the latter thus terminating in two distributaries, in the heads of which are placed regulating ...
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