KP - Water Retention

KP0                 Water retention @    0 Kilopascals
KP10                Water retention @   10 Kilopascals
KP33                Water retention @   33 Kilopascals
KP1500              Water retention @ 1500 Kilopascals

Water retention units are % by total soil volume (including coarse
fragment content).

KP0

mineral horizon 3-90; may be -9 if KIND=U or N
organic horizon 50-98; may be -9 if KIND=U or N
R,W -9

KP10

mineral horizon 2-90; may be -9 if KIND=U or N
organic horizon 35-80; may be -9 if KIND=U or N
R,W -9

KP33

mineral horizon 0-61; may be -9 if KIND=U or N
organic horizon 10-70; may be -9 if KIND=U or N
R,W -9

KP1500

mineral horizon 0-45; may be -9 if KIND=U or N
organic horizon 5-50; may be -9 if KIND=U or N
R,W -9

     KP10 and KP33 must not both be missing for KIND=M or O.

     The order must be KP0>=KP10>=KP33>=KP1500 allowing 
     for one of KP10 and KP33 to be -9
     
     If HZN_SUF=z then KSAT, KP0, KP10, KP33, KP1500 MUST BE -9