The average cost of the drainage system completed was $16.50 per 

 acre, and it is believed that the drainage of larger tracts could be 

 accomplished at about the same cost. Some of the stated items of 

 expense could be considerably reduced, but others would be greater. 

 For example, while it might be possible to obtain better prices on tile, 

 if purchased 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 underlain at an average depth of 26 inches by white calcare- 

 ous hardpan, from 1 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 con- 

 sists of a layer of peculiar brown material, somewhat inclined to frac- 

 ture 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 12 inches beneath the surface. When it is turned 

 with the plow in a dry condition, it breaks into particles ranging in 

 size 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 excava- 

 ting during the drainage installation 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 conditions it was deemed advisable 

 to place the drains 150 feet apart, and this interval was used, except 

 in one instance. The system for the 40 acres includes 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 draintile. 

 The exception alread}^ referred to is in the interval 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 10-inch, 300 feet of 8-inch, and 520 feet of 

 6-inch tile. 



The 10-inch tile in the main drain have a capacity sufficient to 

 remove 4 inches of water per week from the adjacent lands, or lands 

 underlain by laterals Nos. 1 to 7. Ordinary operations for reclama- 

 tion do not overload the drains, however, since the factors of summer 

 evaporation and subdrainage through the soil play important parts in 

 the disposal of the water added in flooding operations. 



