San Francisco : Architect and Engineer, Inc · leaf 418
vel 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… … Automatic Gates on a Tropical DrainageProject preser\-es, salt works and at riversideand seaside parks such a device becomesof great practical importance. Now comes a still further developmentof the same idea. There are many situa-tions where it is desirable to maintainponds at certain seasons and…
Architecture · Building
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