Groundwater

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Across
  1. 4. drinkable
  2. 5. a river and the collection of its tributaries
  3. 7. flat land subject to periodic flooding
  4. 8. volume of water flowing past a given point
  5. 12. surface water moving through cracks and pore spaces
  6. 14. saltwater contamination
  7. 15. unending circulation of Earth's water supply
  8. 16. stream emptying into another stream
Down
  1. 1. flood control measure
  2. 2. ability to transmit water though pore spaces
  3. 3. sinking of land due to loss of groundwater
  4. 6. accumulation of sediment where a river enters an ocean
  5. 9. permeable rock layers that hold ground water
  6. 10. land area contributing water to a river
  7. 11. water within soil and rock
  8. 13. percentage of pore spaces