lume Necessary_

The second essential requirement is _ample quantity_. The supply must
be one which furnishes an ample volume _at all seasons_ and for all
purposes.

What is a reasonable daily domestic consumption? The answer to this
question necessarily depends upon the character of the building and
the habits and occupation of its inmates. It is a universal experience
that as soon as water is introduced it is used more lavishly, but also
more recklessly and regardless of waste. For personal use, from twenty
to twenty-five gallons per person should prove to be ample per day:
this comprises water for drinking and cooking, for washing clothes,
house and kitchen utensils, personal ablutions, and bathing; but,
taking into account other requirements on the farm or of country
houses, we require at least sixty gallons per capita per diem. To
provide water for the horses, cows, sheep, for carriage washing, for
the garden, for irrigation of the lawn, for fountains, etc., and keep
a suitable reserve in case of fire, the supply should be not less
than 150 gallons per person per day.

_A Good Pressure Required_

The third essential requirement is a _good water pressure_. Where a
suitable source of water is found, it pays to make it conveniently
available, so as to avoid carrying water by hand, which is troublesome
and not conducive to cleanliness. A sufficient pressure is attained by
either storing water at, or lifting it to, a suitable elevation above
the point of consumption. In this respect many farm and country houses
are found to be but very imperfectly supplied. Often the tank is
placed only slightly higher than the second story of the house. As a
result, the water flows sluggishly at the bathroom faucets, and, in
case of fire, no effective fire stream can be thrown. Where a
reservoir is suitably located above the house, the pressure is
sometimes lost by laying pipes too small in diameter to furnish an
ample stream. Elevated tanks should always be placed so high as to
afford a good working pressure in the entire system of pipes. Where a
tower of the required height is objectionable, either on account of
the cost or on account of appearance, pressure tanks may be installed
which have many advantages.

In selecting a source of water supply, the following points should be
borne in mind for guidance: first, the wholesomeness of the water;
next, the cost required to collect, store, and distribute the water;
finally, wher