Discharge data examine the process of hydrologic cycle and used significantly in water resource planning
and irrigation and flood control planning. However, it needs lots of time and money to get the discharge data. So
discharge rating curve is usually used in converting discharge data. Therefore reliability of discharge rating curve
absolutely depends on quality of discharge data. Many engineers who study hydrologic engineering make high
quality discharge data to develop reliable discharge rating curve. And they carry out research on standard and
method of discharge measurement, and equipment improvement. Now various flow meters are utilized to make discharge data in Korea. However, accuracy of equipment and experimental research data from measurement are not
enough. In this paper, constant discharge flowed through standard concrete channel, and the velocity is measured
using various flow meters. Also Discharge is calculated by measured data to compare and analyze. The equipment
for the experiment is Price AA(USGS Type AA Current meter), flow meter, ADC, C2 small current meter, flow
tracker, Electromagnetic current meter. The discharge got form various flow meters which are widely used for
discharge measurement. The various depths of water were examined and compared such as 0.30 m, 0.35 m, 0.40 m,
0.45 m, 0.50 m, 0.55 m. The experiment progresses a round-measurement on 6-case. Wading measurement(one point
method : the 60 % height in surface of the water) was applied to improve creditability and accuracy among
measurement methods. USGS Type AA current Meter, Flow Meter, ADC, C2 Small Current meter got the certificate
of quality guaranteed. So the results of experiment were used to compare discharge. The Results showed the
difference based on USGS Type AA current Meter at average discharge and velocity. Electromagnetic current meter
made differences over ± 10 % and Flow Meter made differences under ± 10 %. Also ADC, Flow Meter, C2 Small
Current meter made differences under ± 5 %.
Keywords : Stage-Discharge Curve, USGS Type AA Current Meter, Flow Meter, ADC, C2 Small Current Meter,
Flow Tracker, Electromagnetic Current Meter