TILE DRAINAGE. 



10;; 



laterals were laid just where they are. The map will repay 

 careful study. 



SPECIAL PROBLEMS AND QUESTIONS. 



I next touch upon several inquiries, problems, and state- 

 ments that have come to me by mail. 



From Sheboygan, Mich., came the following letter and 

 diagram which I answered in The National Stockman in sub- 

 stance as below. 1 quote w r ith due credit. 



" I have a wet, boggy piece of land, too wet to pasture, which I 

 wish to drain into two or throe reservoirs. This diagram shows 

 the shape, slope, and features of the land, and my plan concern- 

 ing it. The darts show the slope. Could this piece be drained by 

 cutting one ditch toward the southeast along the dotted line A B 

 (see cut), another southwest as shown by the other dotted line 



UEVEL. DRYISH LANB. 



Fig. 29. Problem submitted. 



CD. or will it be necessary to cut other ditches running parallel 

 to the north and west ditches [I don't understand this], or to run 

 from A to S? Also how far apart, how deep, and what sized 

 tiles? Should they be laid close, and be mortared on top. or a 

 little way apart on top ? Should the ditch have a good pitch ? " 



Now, this letter is too indefinite. The amount of fall is not 

 given, nor the reason why he wants to drain into reservoirs. 

 Assuming that he has reasons, that he can't get other (free) 

 outlet, and that these reservoirs have gravel bottoms, and that 

 they will dispose of the water from the bog so that it will not get 

 back into the tiles, 1 answer the queries as follows : 



Such a bog. unless the soil is quite porous, would need drains 30 

 to 50 feet apart and r*, 1 * to 3 1 ., feet deep. As to pitch, get all that 

 the land will give you. If nearly a dead level, "shade up'' a 

 i rifle, say from IJJ... feet deep at the outlet, to 2% feet deep at the 

 upper end. As to size of tiles, I would use none less than three or 

 four inch in a k ' bog." Lay the tiles as close as possible, and use 



