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water quality(125)
water pollution(41)
surface water(34)
water resources(27)
rivers(18)
water management(14)
lakes(12)
sediment(12)
fresh water(10)
habitats(10)
turbidity(10)
ecosystems(9)
seasons(8)
bathing water quality(7)
diarrhea(7)
algae(6)
chlorine(6)
pollutants(6)
ponds(6)
sanitation(6)
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