NURSERY PRACTICE ON THE NATIONAL FORESTS. 
13 
should be drawn to scale. A system embodying these desirable 
features is shown in figure 1. 
Cost of pipe. — While the costs of pipe vary, some of the prices 
paid at Forest Service nurseries are cited, simply to show the relative 
value of different types: 
Cents 
per foot. 
6-inch Douglas fir wooden pipe 1 17i 
4-inch Douglas fir wooden pipe 13| 
4-inch black iron pipe 43£ 
25-inch galvanized-iron pipe 25 
2-inch galvanized-iron pipe 18 
li-inch galvanized-iron pipe 12 
1-inch galvanized-iron pipe 8 
Oral 
rh plug 
I Boundary o. 
I Nursery Area 
Main Pipe Line 
— Lateral Pipe Line 
9 Gate Valves 
Unions 
» Faucets 
® 
1 
f 
1 
1 
1 
i 
1 
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1 
i 

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J 

l 
i 
i 
i 
1 
! 
1 
i 
i 
1 
7 
i 
i ■ 
] 
i 
i 
1 
i 
T 
i 
1 
1 
1 
1 
1 
1 ■ 
Fig. 1. — Diagram of a water system. 
COMPARATIVE MERITS OF IRRIGATION AND SPRINKLING SYSTEMS. 
In general, irrigation is not so satisfactory as a piping system. 
It has some commendable points and others which are objectionable. 
It does not require so large an initial outlay as a sprinkling system; 
there need be very little head to the flow of water; in subirrigation 
by ditches heavy soils do not tend to bake so much as when sprinkled ; 
possibly a greater area can be covered per day than by sprinkling, 
and the water which comes in open ditches usually is warmer 
than that coming through pipes, which is a desirable feature. On 
the other hand, to irrigate effectively there must be very little 
slope to the land and the area must be very evenly graded; ditch 
irrigation necessitates frequent paths, and consequently a much larger 
area for the production of stock, with all that it entails in prepara- 
1 Douglas fir wooden pipe has given excellent satisfaction where used, 
pipe wears better than black iron pipe. 
Galvanized-iron 
