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See Hoffman report page 71 [[BR]]

* op_slope_score =op_height/op_depth[[BR]]
||>5||+1||
||1.5-5||0.5||
||1-1.5||0||
||0.25-1||-0.5||
||<0.25||-1||
||NA||0||

* op_rug_score[[BR]]
||metal, béton -étanche et lisse||1||
||maconnerie||0.5||
||pierres||-0.5||
||other||-1||

 * ob_score=ob_rug_score+ob_slope_score+ob_height[[BR]]
si "bueno" --> passe à poisson --> 0
 * op_score_expert*