116 TILE DBAIKAGE 



For 2 acres, Itf-inch pipes (with collars). 



For 8 acres, 2#-inch pipes (with collars). 



For 20 acres, 3V*-inch pipes. 



For 40 acres, two 3*4-iuch pipes, or one 5-inch sole tile. 



For 50 acres, 6-inch pipes or sole tile. 



For 100 acres, 8-inch pi pas, or two 6-inch sole tiles. 



"It is not intended that these drains will immediately 

 remove all the water of the heaviest storm, but they will 

 always remove it fast enough for practical purposes." 



I do not think tfwy will. 



French gives several pages of dense and discouraging 

 tabulated figures showing the velocity in feet per second 

 and discharge in gallons per 24 hours for many sizes of tiles 

 and grades of fall; but he gives, so far as I can lind, no 

 definite recommendations. He says : tk The size of tiles is a 

 matter of much importance. Tiles should be large enough 

 to carry off in a reasonable time all the surplus water that 

 may fall upon the land. Here the English rules will not be 

 safe for us ; for although England has many more rainy days 

 than we have, yet we have more inches of water from the 

 clouds in a year. Instead of their eternal drizzle we have 

 thunder-showers in summer, and in spring and autumn north- 

 east storms, when the windows of heaven are opened, and a 

 deluge, except in duration, bursts upon us. Snows cover the 

 fields until April (in the North), when they suddenly dissolve, 

 often under heavy showers of rain, and planting-time is at 

 once upon us. It is desirable that all the snow and rain 

 water should pass through the soil into the drains, instead of 

 overflowing the surface, so as to save the elements of fertility 

 with which such water abounds, and also to prevent the 

 washing of the soil. We require, then, a greater capacity of 

 drainage, and larger tiles, than do the English, for our drains 

 must do a greater work than theirs, and in less time.'" 



And yet he gives no tangible rule or opinion as to whai 

 sized mains are required here for various areas. 



Klippart quotes French's tables, and, in substance, his 

 remarks about the English drizzle, but gives no definite or 

 tangible rule or formula. 



