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, souk; of the prices 

 paid at Forest Service nurseries are cited, simply to show the relut i \ < 

 value of different types: 



pet foot 



6-inch Douglas fir wooden pipe 1 IT , 



4-inch Douglas fir wooden pipe i:; 



4-inch black iron pipe _ 4:}$ 



2^-inch galvanized-iron pipe 25 



2-inch galvanized-iron pipe ]s 



p-inch galvanized-iron pipe 12 



1-inch galvanized-iron pipe 8 



Drain pipe with plug 



/ Boundary o. 

 1 Nursery Area 

 ■ Main Pipe Line 

 -Lateral Pipe Lines 



Gate Valves 



Unions 



Faucets 



1 



1 



1 



1 



1 



i 



1 

 1 



i 



1 



i 



T 



i 



1 

 j 



i 



1 

 | 



T 



! 



1 

 i 



i 



i 

 i 

 i 



1 

 1 

 i 



ra 



A 



1 



1 



1 



I 



1 



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. Gal 

 pipe wears better than black iron pipe. 



