1062 LAWS OF MARYLAND.

(e) Sewerage Districts: All the territory within which the
topographic or economic conditions are such as to make possible
or advisable the concentrations of sewerage at one point, either
for treatment or final disposition or transportation to a more
distant point.

(d) Drainage: All storm, surface or ground water, either
in natural or artificial channels.

(e) Drainage System: All the agencies, methods, appli-
ances or operations, natural or artificial, singly or combined,
that enter into the collection, transportation and final disposi-
tion of storm, surface or underground water.

(f) Drainage District: All the territory forming the water
shed of a particular stream.

(g) Sewerage or Drainage Areas: Sub-divisions of sewer-
age or drainage districts made necessary by topographic or
economic conditions.

(h) Public Nuisance: Any matter whether solid, liquid, or
gaseous, which of itself is injurious to health, or which may
become so, on contact with other substances, whether the latter
may be in themselves harmful or not, further, any matter which,
though not demonstrably poisonous, is offensive to the senses
or which on being allowed to run into a stream will render the
water therein unfit for such purposes as it was used before pollu-
tion. Also such disposition of any matter, that it may, while
in condition above described, approach within affective distance
of any distance of any dwelling or occupied land shall be held
a public nuisance.

468-D. And be it further enacted, That upon the passage
of this Act, the said Commission shall cause to be shown on a
map of said Montgomery County, the various drainage districts
therein, as shown by the topography in the different parts of
the County. It may thereupon determine which of the districts
or parts thereof is in most need of sewerage or drainage facili-
ties, and proceed to have accurate surveys of said districts
made and maps prepared, showing the outlines thereof, and
the various sewerage and drainage areas therein, together with
such topographic detail as will be necessary for the proper
design of sewerage or drainage systems or parts thereof.

Upon these maps shall be projected a proposed plan of main
sewerage and drainage for each district and the various sewer-