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October 1st is mostly used, but it varies from country to country. In Norway, the hydrological year start on September 1st, mostly because groundwater levels are at their lowest. At that time of the year, all snow in the mountains has melted, and it is before temperatures fall and the autumn rain settles in. It is probably better to use October 1st than ...


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It all depends where you are and how carefully you choose your water sources. In the Malaysian jungle (peninsular Malaya and Sarawak), I used natural water sources all the time for years on end without ill consequences. There are numerous springs and small streams where the water is always good, but we never used a main river where there was habitation ...


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