DEVICES, APPIvlANCES AND CONTRIVANCES. 395 



hundred feet to the mile, the sewer having a velocity 

 of 2.58 feet a second of time when running full. The 

 sewer, unfortunately, had to cross the Las Animas 

 river, which was accomplished by the means of an 

 inverted siphon made of sixteen-inch cast-iron pipe 

 having a masonry catch-basin at either end, as shown 

 in Fig. 92. The siphon carries a current having a 

 velocity of 4.68 feet a second when running full, a 

 rather high velocity being necessary to keep it from 

 choking. A masonry chamber is built at the mouth of 

 the outlet, from which the sewer is condudled to 

 various reservoirs. There are automatic flushers at 



FIG. 92 — INVERTED SEWER SYSTEM. 



the head of each lateral, so that the sewage is well 

 diluted by the time it reaches the final outlet, very 

 little solid matter remaining. The sewage might just 

 as well be delivered into open ditches from the siphon 

 catchment, and these could serve as head ditches at the 

 land to be irrigated, provided, of course, the grade 

 would be sufficient. In winter the surplus sewage 

 might be condudled to various reservoirs, where it 

 could be stored or allowed to seep away as desired. 



In selecfting ground for a sewage farm account 

 must be taken of the relative elevation of the land, and 

 of the town, manufac5lti ring establishment, or residence 

 from which the material comes. Whenever possible, 

 as a matter of economy, the farm should be sele(5led 



