drainage and sanitation

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Across
  1. 2. easily blocked by
  2. 3. after the treatment of water
  3. 7. sewage may collect
  4. 8. grow and multiply stagnant wastewater
  5. 9. contamination of drinking water can happen in
  6. 10. proper drainage system
Down
  1. 1. breeding are encountered in open drains
  2. 4. decay of organic waste present in waste water leads to
  3. 5. treated sewage is major source of groundwater pollution
  4. 6. is allowed to flow into water bodies