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COD was previously measured from sampled water. Then 1 month measurement does not include flood condition because of safety for sampling. 1 hour measurement is automatically sampled and measured in situ at station and then includes flood condition. To clarify difference between 1 month measurement and 1 hour measurement , using both measuring results of flow rate, COD, TB and EC values of the Yamatogawa river, effect of flow rate on COD , TB and EC values was clarified. COD and TB values increased with flow rate. EC value decreased as flow rate increased . The relationships between COD and flow rate, TB and flow rate were very similar. Therefore , COD was more strongly influenced by floating material than soluble substances because TB was concentration of floating material . Using the relationships between COD and flow rate, COD loads were calculated. As a result , the COD load calculated by the 1 hour measurement was more about 2 times than the COD load calculated by the 1 month measurement.

CHARACTER OF COD VALUES WITH FLOW RATE CLAFIED BY ONE HOUR AUTOMATIC MEASUREMENT IN THE YAMATOGAWA RIVER