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Temakartet «Avrenning» rangerer bebygde arealers etter evnen til å ta opp og fordrøye rennende vann. <\/SPAN><\/P>

Kartet klassifiserer areal etter dekkets permeabilitet. Tak, asfalterte veier og plasser, betongdekker, fjell i dagen omtales ofte som impermeabelt. Hardtråkket grusdekke, leire/silt omtales ofte som semipermeabel. Gressplener og blomsterbed omtales gjerne som helt permeable. <\/SPAN><\/P>

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