Primaries used as pipe inserts cost under $1000. A 6-in (150-mm) Parshall flume costs about $1500, and a 48-in (1.22-m) Parshall flume costs about $5000. Primaries for irrigation applications are usually field-fabricated. Manual depth sensors can be obtained for $200; local bubbler or float indicators for $750 to $1500; and programmable transmitting capacitance, ultrasonic, or bubbler units from $1800 to $3000. Open-channel flowmeters, when calculating flow based on depth and velocity, range from $5000 to over $10,000.
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