ARC Boats use ultrasound pulses to collect data about how much water is flowing in rivers

• Less than 10,000
• 10,000 to 49,999
• 50,000 to 99,999
• 100,000 to 499,999
• 500,000 to 999,999
• 1 million to 1,999,999
• 2 million or greater

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