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drains must pursue a winding or zig
h e fall
red uce t
protected by a facing of stone
base may be t
The maximum gradient which is admissible depends on
r e of the soil
the natu
sistency an ave
indicated
on firm soil it may b e great
The
l l
N
d
F
s
L
r
N
d
L
d
F
i s intended to drain
r eater than the l a tter
g
draining may vary f
species to be grown
inches
while
r ained to a dept h of
which is d
igs
and
a locality is drained
h e
T
I M I NA
PR
L
or the bas
r aced
r
age fall of
h e feeders d
of t
l
d
d
p
s
l
l
dr
l l
l
r
rs
d
p
s
p
h
pp
h
s
d
land
r om
cotch pine
illustrate the comparative depth to which
and that of the feeder s and lead
of
drains d
Y
ORK
and sides of the d
or fascines
per cent
pends on the d
d
d
d
s
h
h
h e form
t
The depth to which the soil requi
inches to
r nbeam
ho
beech and silver fir
feet
pends on t
zag course
r ains
in som
would prob
r
on loose soil smaller
pth to w
s
L
h r
A
s
l
x
d
r must be som ewh
feet
according to the
and elm can do wi
h e fall and on the
so as to
must
ca ses the
a bly be
h ich it
d
d
a t
r es
h
pref
r soil
rs
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