In view of all the information that can be gathered on the subject, the
following directions are given as perfectly reliable for drains four feet
or more in depth, laid on a 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.
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