D ralnape Site Classes 



To determine reasonable permeabilities for 

 the Department of Water Resources mapped w 

 classified them by drainage site classes, 

 tlon scheme was based on the physiographic 

 earlier, on soil profile texture, and on s 

 These drainage classes permit more exact d 

 ability of a given soil to transmit water 

 and horizontally. 



different soils, 

 est side soils and 

 This classlflca- 

 posltlons defined 

 tratlgraphy . 

 escrlptlons of the 

 both vertically 



Drainage from tile systems within each drainage site class 

 was composited and averaged to determine the relative 

 discharge and nutrients for a particular grouping. A map 

 designating the locations of some of the drainage site 

 classes mapped along the west side is taown in Figure 15. 

 Meanings of symbols used in the delineations are presented 

 in Table l8. The acreage of tile systems sampled within 

 each class is presented in Table 19 along with the average 

 discharge and concentrations of nitrogen, phosphorus, and 

 total dissolved solids. The drainage site classes are 

 presented in their order of decreasing permeability. 





FIGURE 15/DRAlNAGE Siir CLASSES-GU^TIN^ TO MENDOT^ AREA 



66 



