176 



FORESTRY AND IRRIGATION 



April 



to obtain better prices on tile, if pur- 

 chased in larger lots, the drainage of 

 any more extensive area would require 

 the digging of an outlet either to the 

 Jordan River or to Great Salt Lake. 



The tract is composed of a surface 

 soil of loam and sandy loam, with a 

 depth ranging from 12 to 18 inches. 

 The underlying material is a heavy 

 clay. A very shallow sand stratum 

 occurs at a depth of 4 feet over the 

 greater part of the tract. The lower 

 or lakeward half of the tract is under- 

 lain at an average depth of 26 inches 



from inch cubes to granules about as 

 large as buckshot. When wet, it still 

 breaks on regular lines of fracture, but 

 materially softens, and if thoroughly 

 plowed loses its hardpan properties. In 

 excavating during the drainage instal- 

 lation it was necessary to break the dry 

 material with a pick, as was also the 

 case with the white hardpan. 



With the above soil and hardpan con- 

 ditions it was deemed advisable to place 

 the drains 150 feet apart, and this in- 

 terval was used except in one instance. 

 The system for the 40 acres [includes 



laiofeet 



R- 



i. 



Z. eso fed 



tincJitilc, 



3,-nJifile. 



Intake. 



carrai, 

 PLA.VI OF OPERATIONS NEAR SALT LAKE ClTV. 



by white calcareous hardpan from i to 

 2 inches in thickness. Occasionally 

 two strata of this hardpan are found, 

 the first lying about 4 inches above the 

 second. 



Another special soil feature occurs in 

 places in the tract. This consists of a 

 layer of peculiar brown material, some- 

 what inclined to fracture along lines 

 after the manner of adobe, and yet 

 maintaining in the interior part of the 

 layer a hard, impervious core. This 

 material is found at from 4 to 1 2 inches 

 beneath the surface. When it is turned 

 with the plow in a dry condition, it 

 breaks into particles ranging in size 



eight lateral drains and one main drain. 

 Each of the laterals is 1,250 feet long, 

 and is laid with 850 feet of 4-inch and 

 400 feet of 3-inch drain tile. The ex- 

 ception already referred to is in the in- 

 terval for lateral No. 8, which is laid 

 200 feet from the nearest lateral, the 

 object being to study its efficiency under 

 such conditions of soil as exist in this 

 tract. 



The main drain is put in across the 

 lower part of the tract, 20 feet from its 

 west side, and is met by seven of the 

 laterals. This drain was laid with 270 

 feet of lo-inch, 300 feet of 8-inch, and 

 520 feet of 6-inch tile. 



Diagram used by permission of the Bureau of Soils. 



