I found that if the water supply is not enough, the number of Islands is about 2 30 m³. The proposed groundwater sources should be used, such as adding a special filter system in the original DOM to filter rust, iron and turbidity, which are cheaper than the cost of the water surface, which must invest to create new sources of water from irrigation water canal. But if there are plans to expand the system to supply the whole Tambon proposes to use water from a water surface because it is more than worth the investment. However, Heavy metals mentioned above may also be a problem, because it is not possible to eliminate the tap filter.
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