'it's not so easy to prepare the sewer for visitors,' says Mr. Gottschall in Vienna, an engineer who once designed sanitary works.

Standard Practice for Least Cost (Life Cycle) Analysis of Concrete Culvert, Storm Sewer, and Sanitary Sewer Systems.

Should a site waste treatment system not be available, permission could be obtained from the municipal or private sewer authority to put neutralized waste solutions to sanitary drains.