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wet     = scen.groundWet;       // current scen.groundWet before changing
ground  = scen.groundCond;    // current scen.groundCond before changing

WET_LOW  = 0,  //when 0, terrain gets more dry (dry > mud > froz)
WET_DEF  = 2,  //default at start of scenario
WET_HIGH = 4   //when 4  terrain gets less wet (froz > mud > dry)

GND_DRY  = 0,  // dry ground
GND_FROZ = 1,  // frozen ground
GND_MUD  = 2   // mud ground

//First checks if ground wet changes
//
if (weather is rain or snow)  // if any precipitation
{
   if (wet < WET_HIGH)     // scen.groundWet cannot be more than WET_HIGH
      scen.groundWet ++;   //increase level
}
else  // there is no precipitation
    if (wet > WET_LOW)           
       scen.groundWet--;   //decrease level

// Then checks ground condition
//
if (wet != scen.groundWet) // wet changed, so can change scen.groundCond
{
   wet = scen.groundWet;   // uptate to new wet level

   if (gndWet == WET_LOW)  // change in sequence: froz > mud > dry
   {
      if (ground == GND_FROZ)   
      {
         scen.groundCond = GND_MUD;
      }
      else if (ground == GND_MUD)
      {
         scen.groundCond = GND_DRY;
      }
   }
   if (gndWet == WET_HIGH)  // change in sequence: dry >mud > froz
   {
      if (ground == GND_DRY and is raining)  // raining change always to MUD ?
      {
         scen.groundCond = GND_MUD; 
      }
      else
         if (ground != GND_FROZ and (is raining or snowing))   // if not frozen and any precipitation
         {
            scen.groundCond = GND_FROZ;
         }
   }

// if scen.groundCond changed, reset scen.groundWet
if (ground != scen.groundCond)
{
   scen.groundWet = WET_DEF;
}