An anti-clogging flume and structure for metering fluid flow over the flume wherein the flume is of a length sized to be inserted within a pipe and which flume has a generally cylindrical opening as an inlet at one end and a V-shaped outlet at the other end and the flume converges from the inlet end smoothly inwardly and upwardly to the outlet end with a spillway being defined at the outlet end, the spillway outlet being elevated with respect to the lowermost portion of the flume at the inlet end, and structure exterior of the flume for introducing gas into the flume adjacent the inlet end through a hole in the lowermost portion to bubble the gas through the flow along the flume adapting it for use with a recording device to meter, measure and record flow of water through the flume.
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