394 Irrigation and Drainage 



are tapped every 3 feet for short half -inch nipples 

 with caps. With this arrangement it is easy to 

 take out water at any desired place, pressure being 



Fig. 121. Small gasoline pumping plant for garden and lawn irrigation. 



maintained in the whole system of pipes when the 

 pump is at work. The pipes for watering the lawn 

 are sunk just flush with the sod, and the nipples 

 rise obliquely upward so short a distance as not to 

 interfere with the lawn mower. The arrows show 

 both the slope of the lawn and the way the water 

 is distributed. By opening only 7 to 10 nipples at 

 a time, a large volume of water is secured, which 

 spreads readily over the surface. In the garden irri- 

 gation, 15 or 20 rows may be watered at once, and if 



