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water quality(134)
surface water(39)
lakes(18)
water management(18)
conservation(13)
nitrogen(13)
population(13)
turbidity(12)
oxygen(11)
phosphorus(11)
carbon(10)
nutrients(9)
agriculture(8)
public health(8)
vegetation(8)
air quality(7)
ph(7)
sustainability(7)
ammonia(6)
emissions(6)
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