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BULLETIN 906. U. S. DEPARTMENT OF AGRICULTUKE. 
Fig. 23. — Overflow stands. 
diver-ion. The valve 
is controlled by a float 
in an auxiliary stand. 
Such an arrangement 
would have v a 1 u e 
where high pressure 
pipe is laid down a 
steep g r a d e . a n d 
where relief stands 
would have to be ex- 
cessively high to back 
water up to all points 
of diversion. In the 
above case, water was 
intended to be used 
for domestic use and 
some provision was 
necessary to keep con- 
siderable pressure at 
each diversion point. 
It was not practicable to allow the entire head of water on the rfipe 
on account of the steep grades and long length of the main, and relief 
stands at frequent intervals, high enough to deliver water to the 
second story of a house were too expensive, and at the same time 
unsightly. 
DISTRIBUTING HYDRANTS. 
After water has been conveyed to the field or orchard, the type 
of distributing hy- 
drant or valve should 
be selected to suit 
the soil, grades, and 
crops to be watered. 
The mo^t common 
type of valve con- 
sists of a stand of 
one length of con- 
crete pipe that is 
fitted with a number 
of small gates 'fig-. 
25 and 26 ) . the size 
of the stand and 
number of gates de- 
pending on the num- 
ber of furrows to be 
Supplied from one Fig. 24. — A diversion stand with covered top and valves. 
