EXPERIMENT STATION BULLETINS. 



487- 



made when plowing the land. Such drains carry away the surface water 

 readily but do not drain the saturated soil and subsoil, and moreover require 

 considerable time in their construction each year and result in appreciable 

 amounts of waste land in cultivated fields. 



Fig. 3. — Natural drainage courses usually afford ample outlet for tile drains. 



CLIMATE 



The climatic conditions of the Detroit area are fairly uniform. Near Lake 

 Erie and the Detroit river frosts are retarded somewhat but this is only 

 for a few days. The nature of the topography does away with practically 

 all frost pockets. 



Climatological data from three stations of the U. S. Weather Bureau are 

 given. Data from the Detroit station are representative of the water front 

 while that taken from Plymouth represents some of the highest land in the 

 entire area. The latter being located on one of the delta formations near the 

 glaciated uplands. Eloise is located on one of the medium elevations of the 

 area and about equidistant from the shore and the uplands. 



