Redwood Pipe TAne 



290 



ground cement pipes to the lands where it is to be used. These 

 pipes extend beneath the surface, out of sight and out of the 

 way, ranging from 14, 12, 10 and 8 inches in diameter for the 

 mains, to 6 and 5 inches for the laterals ; and there were in 

 1888 some 13 miles of these pipes in the Redlands settlement. 



In the general system, the lands are plotted in square 

 10-acre lots, and a 5- or 6-inch lateral supplies one tier of these, 

 delivering the water usually at the highest corner. These pipes 



Fi. 5'J. Pipe line carried on trestle. 



are generally laid on the slope of the country, which one way 

 i-anges from 50 to 100 feet per mile, and do not carry the water 

 under much pressure, but rather more nearly as though it were 

 running in open channels. The accumulation of pressure as the 

 face of the country falls is prevented by the introduction of 

 small concrete chambers from 5 to 6 feet square, placed at 

 frequent intervals, and at the places of branching. As the water 

 passes along the supply pipes it enters these chambers, rising 

 until it falls over measuring weirs in the partition walls of the 

 chamber, and drops into other compartments from which other 

 pipes lead away in their respective directions. 



