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In page Climate of Zambia:

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For the human population, the location of rural settlements is determined by access to water in the dry season (though boreholes are now commonly used to augment supplies). Traditionally, people have also migrated in the drier areas where rivers dambos are not prevalent. In Barotseland, people move with their livestock, grazing them on the Barotse Floodplain in the dry season and moving to higher ground at the margins during the rainy season.[1][citation needed]