FIELD: construction.
SUBSTANCE: drainage system on pilot-production area includes closed header with drains falling into open canal, and header mouth. Additionally the system is equipped with sight drop drainage sump arranged on closed header at the distance from its mouth, where curve of depression towards open canal is set at the level of bottom of the first drain falling into closed header. Sight drop drainage sump is arranged with inner and outer covers and manhole brackets on its inner surface along whole height of sump. Sump diametre makes at least 1.0 m.
EFFECT: invention makes it possible to provide for continuous and high-quality measurement of drain flow from closed header with minimum costs in winter period, and also to produce more valid and more accurate data of field observation of module and volume of drain flow, when open canal is snowbound.
2 cl, 2 dwg
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