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Table 3

Typology of SSC-discharge plots, described by Williams (1989) 

ClassType and description
I. Single-valued line a. Straight line 
b. Bending upward line 
c. Bending downward line 
II. Clockwise loop a. SSC peaking before discharge 
b. Simultaneous peaks of SSC and discharge; asymmetrical SSC and discharge peaks 
c. Spread of SSC graph less than that of discharge graph; bending upwards loop 
d. Spread of SSC graph greater than that of discharge graph; bending rightwards loop 
III. Counterclockwise loop a. SSC peaking after discharge 
b. Same as IIb – counterclockwise direction 
c. Same as IIc – counterclockwise direction 
d. Same as IId – counterclockwise direction 
IV. Single line plus a loop Highly asymmetrical SSC graph, peaking ahead of discharge 
V. Figure eight SSC and discharge graphs of variable skewness 
ClassType and description
I. Single-valued line a. Straight line 
b. Bending upward line 
c. Bending downward line 
II. Clockwise loop a. SSC peaking before discharge 
b. Simultaneous peaks of SSC and discharge; asymmetrical SSC and discharge peaks 
c. Spread of SSC graph less than that of discharge graph; bending upwards loop 
d. Spread of SSC graph greater than that of discharge graph; bending rightwards loop 
III. Counterclockwise loop a. SSC peaking after discharge 
b. Same as IIb – counterclockwise direction 
c. Same as IIc – counterclockwise direction 
d. Same as IId – counterclockwise direction 
IV. Single line plus a loop Highly asymmetrical SSC graph, peaking ahead of discharge 
V. Figure eight SSC and discharge graphs of variable skewness 
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