Water harvesting

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Across
  1. 3. Where will there be a reduced demand if permeable paving is used?
  2. 4. Allowing water to pass through solids.
  3. 7. The process for collecting rainwater.
Down
  1. 1. Needed to clean particles from rainwater.
  2. 2. Position of collection tank.
  3. 5. What water system has a reduction in supplying?
  4. 6. Need for conventional drains.
  5. 8. Where harvested water can be used.