In New York State the Department of Environmental Conservation (DEC)
regulates activites in and adjacent to significant identified
wetlands.  The New York City Department of Environmental Protection
(DEP)uses DEC regulations as the basis of their limits on activities
in or close to their reservoirs and streams contributing to their
reservoirs. One regulation is to limit activity within l00 feet of a
tributory stream. I am building a house on land which is in part
within l00 feet of a tributory stream, and where these regulations
will apply.  May I construct a deck which cantilevers over the
regulated area if there are no footings in the regulated area?  Can I
construct a child's play area:  swings - slide - etc... if they are
not constructed on an impervious base?