The weighted average flow, nutrient concentrations, and TDS 

 in composited drainage from the systems monitored in the 

 entire area over a two-year period (I967-68) are summarized 

 by physiographic positions in Table 16. 



TABLE 16 



TILE DMIN DISCHARGE, NUTRIENT CONCENTRATIONS, 

 AND TOTAL DISSOLVED SOLIDS SUMMARIZED 

 BY PHYSIOGRAPHIC POSITIONS 

 1967-68 



Differences between nutrient concentrations and quantities 

 dischajrged were recognized in tile drains from similar 

 physiographic positions. These inconsistencies led to an 

 examination of soil series as a criterion for determining 

 quantity and quality of tile drainage (Table 17). 



Discharge 



The highest quantity discharged was from one system located 

 in Ambrose soil series. Drainage from this system exceeded 

 17 acre-feet per acre per year in 1968. The next highest 

 discharge was from a tile system located in the Rincon soil 



62 



