The analysis of surface water samples and 3 samples showed that the water quality of the canal narrow majority. There is value in the limit. All stations except BOD, which has exceeded the required standard is 2.0 milligrams per liter. (Ground water standard Category 3), the BOD upstream station is 21.0 milligrams per liter. At the drain of the airport detected BOD reduction is 16.2 milligrams per liter. When combined with water flow in the canal narrows down to a point downstream of the dirt found in the BOD 9.57 milligrams per liter, and the BOD is expected to slow down the flow of water to help dilute the dirt down. This shows that Narrow Canal contamination from the source before receiving water from Nakhon Si Thammarat Airport. Considering the amount of dissolved oxygen The station above the water were 7.75 mg per liter. At the drainage is 8.99 milligrams per liter. And downstream stations is 8.94 milligrams per liter. Shows that the amount of oxygen
dissolved tends to increase the flow of water to help dilute the dirt down as well.
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