| 0.37 | 13.9
October | 2.82 | 1.40 | 49.5
November | 3.83 | 3.26 | 84.9
December | 1.64 | 1.80 | 110.0
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"The filtration from April to September is very small--practically
nothing; but during those months we have 12.67 inches of rain--that
is, we have two inches a month for evaporation besides the quantity
in the earth on the first day of April. From October to March we
have 10.39 inches filtered out of 13.95 inches, the whole fall. 'Of
this Winter portion of 10.39, we must allow at least six inches for
floods running away at the time of the rain, and then we have only
4.39 inches left for the supply of rivers and wells.' (Breadmore,
p. 34.)

"It is calculated in England that the ordinary Summer run of
streams does not exceed ten cubic feet per minute per square mile,
and that the average for the whole year, due to springs and
ordinary rains, is twenty feet per minute per square mile,
exclusive of floods--and assuming no very wet or high mountain
districts (Breadmore, p. 34)--which is equal to about four inches
over the whole surface. If we add to this the six inches that are
supposed to run off in freshets, we have ten inches discharged in
the course of the year by the streams. The whole filtration was
11.29 inches--10.39 in the Winter, and .90 in the Summer. The
remainder, 1.29 inches, is supposed to be consumed by wells and
excessive evaporation from marshes and pools, from which the
discharge is obstructed, by animals, and in various other ways.
These calculations were made from experiments running through eight
years, in which the average fall of water was only 26.61 inches per
annum. When the results derived from them are applied to our
average fall of 35.28 inches, we have for the water that
constitutes the Summer flow of our streams 13.25 cubic feet per
minute per mile of the country drained, and for the average annual
flow, exclusive of freshets, 26.50 cubic feet per mile per minute.
That is to say, of the 35.28 inches of water that fall in the
course of the year, 5.30 run away in the streams as the average
annual flow, 7.95 run away in the freshets, and 20.47 evaporate
from the earth's surface, leaving 1.56 for consumption in various