well regulated fall of even three inches in a
hundred feet:

For 2 acres 1-1/4 inch pipes (with collars.)

For 8 acres 2-1/4 inch pipes (with collars.)

For 20 acres 3-1/2 inch pipes

For 40 acres 2 3-1/2 inch pipes or one 5-inch sole-tile.

For 50 acres 6 inch pipes sole-tile.

For 100 acres 8 inch pipes or two 6-inch sole-tiles.

It is not pretended that these drains will immediately remove all the
water of the heaviest storms, but they will always remove it fast enough
for all practical purposes, and, if the pipes are securely laid, the
drains will only be benefited by the occasional cleansing they will
receive when running "more than full." In illustration of this statement,
the following is quoted from a paper communicated by Mr. Parkes to the
Royal Agricultural Society of England in 1843:

"Mr. Thomas Hammond, of Penshurst, (Kent,) now uses no other size for the
parallel drains than the inch tile in the table, (No. 5,) having commenced
with No. 4,(11) and it may be here stated, that the opinion of all the
farmers who have used them in the Weald, is that a bore of an inch area is
abundantly large. A piece of 9 acres, now sown with wheat, was observed by
the writer, 36 hours after the termination of a rain which fell heavily
and incessantly during 12 hours on the 7th of November. This field was
drained in March, 1842, to the depth of 30 to 36 inches, at a distance of
24 feet asunder, the length of each drain being 235 yards.

"Each, drain emptied itself through a fence bank into a running stream in
a road below it; the discharge therefore was distinctly observable. Two or
three of the pipes had now ceased running; and, with the exception of one
which tapped a small spring and gave a stream about the size of a tobacco
pipe, the run from the others did not exceed the size of a wheat straw.
The greatest flow had been observed by Mr. Hammond at no time to exceed
half the bore of the pipes. The fall in this field is very great, and the
drains are laid in the direction of the fall, which has always been the
practice in this district. The issuing water was transparently clear; and
Mr. Hammond states that he has never observed cloudiness, except for a
short time after very heavy flushes of rain, when the drains are quickly
cleared of all sediment, in consequence of the velocity and force of the
water passing through so small a channel. Infiltration through the soil
and into the pipes, must