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What does the term "Storm Water drain" means?

edited June 2014 in Current Affairs
Related to NGT decision on yamuna cleaning..


  • edited June 2014
    Prelims : 2/5; Mains : 0/2; Interview : 0; Remainder : 1+1 (Tired but not; Retired) / Medical Science / Kolkata / Nihilist extraordinaire | Thanks a lot...
  • Related to NGT decision on yamuna cleaning..
    We have a sewarage drain for municipal sewage.
    Storm water drain is separate from municipal drain to carry rainfall runoff.

    Sewerage systems can be classified into combined sewerage and separate sewerage. Combined sewerage carries both stormwater and wastewater, while separate sewerage carries stormwater or wastewater separately. Recent trends have been for the development of separate sewerage systems. The main reason for this is that stormwater is generally less polluted than wastewater, and that treatment of combined wastewater and stormwater is difficult during heavy rainfalls, resulting in untreated overflows
  • Thanks...another doubt. ..though a silly one

    what's the difference between efficiency vs efficacy? Are they same., can be used interchangeably. .

  • @gini, efficacy is effectiveness of something, efficiency is how well that something achieves its efficacy.

    For example, two tablets A&B, both cure headache properly and hence can be said to have efficacy. But, say A cures it in 5 minutes and B in 30, one may say A is more efficient. Now the parameter to judge efficiency may vary, it can be time, it can be cost of medicine, amount of medicine, etc.

    But, they are not interechabgeable.
  • To add to above.
    Efficacy: capacity to produce desirable result
    Efficiency: output input ratio e.g. minimise waste
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