File:Architect and engineer (1922) (14801613773).jpg

Identifier: architectenginee7022sanf (find matches)
Title: Architect and engineer
Year: 1905 (1900s)
Authors:
Subjects: Architecture Architecture Architecture Building
Publisher: San Francisco : Architect and Engineer, Inc
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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t soon became apparent, how-ever, that such a gate was even more use-ful among the lowlands of the Sacra-mento and San Joaquin Valleys and inthe Island Country. There great areasof fertile land are protected by dikes andlevees. It is necessary to rid them ofsurface water and equally necessary toguard against back-flow. The device ofa sump next the levee over which thewater was raised by pumping was cum-bersome and expensive. A suitable pumpand motor cost several hundred to severalthou.sand dollars according to size; powerhad to be supplied and a certain measureof supervision. A corrugated pipethrough the levee with an automaticvalve on the outer end solved the wholeproblem. Water could flow freely fromthe land to the river whenever the latterwas at low or medium stage, but waseffectually prevented from re-floodingthe drained areas when the river rose tohigher levels. During the pa.st year or two an appli-cation of the exact reverse of this prin-ciple has been found decidedly useful in
Text Appearing After Image:
Automatic Drainaire Gate at the Oliver SaltWorks, Mount Eden. Calif. connection with duck ponds, log pondsand seashore lakes. A pipe installeilwith an automatic gate on the outer endresults in ridding land of surface water and maintaining it in that condition inthe face of later rises of the water in thedrainage way; but a reversed installa-tion (the gate on the inlet end of thepipe) will work in the opposite way, thatis, it will tend to maintain a pond insidethe dike at a level corresponding withthe high level of the tide or river. When-ever the water rises outside the dike itflows freely into the pond, but as soon asits level falls below that of the pond thegate closes and the water is retained.The advantages are obvious. Ponds, lakes and storage reseivoirs can be main-tained throughout the year at the highestlevels reached by any neighboring bodyof water save for such losses as occurthrough evaporation and seepage, andthis without any expenditure for poweror supervision. At lumber

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