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WATER PRESSURE ON WEIR

WATER PRESSURE ON WEIR

WATER PRESSURE ON WEIR

(OP)
I'm wondering if anyone can give me a bit of advise on the following, in connection with water pressures exerted on a low overflow intake weir.
The elevation of the weir crest in question is pre-determined by existing pipework. This results in the base of the downstream collection chamber (built into the weir) being for the most part below (up to 1m) the level of bedrock forming the stream bed. The average overall height dimension of the structure is 2.1m.
My question regards the water pressures exerted on the lower (buried) part of the structure:-
Assuming that the structure is cast onto the bedrock at the bottom of the excavation and the space between the structure and the remaining bedrock is backfilled with mass concrete up to original streambed level, are there any water pressures exerted on the parts of the structure below the top of the mass concrete?

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