Help with programming project

...Init_Water(CurrWater, barrels); 
 
Time_Step_Water(CurrWater, NewWater, evaporation, wind);
 
Copy_Water(CurrWater, NewWater);
 
Display_Water(NewWater);
 
return 0;
 
}
 
 
 
void Init_Water(double CurrWater[][COLUMNS], double barrels)
 
{
 
for(int i = 0; i < ROWS; i++)
 
{
 
for(int j = 0; j < COLUMNS; j++)
 
CurrWater[i][j] = 0.0;
 
}
 
CurrWater[ROWS / 2][0] = barrels;
 
}
 
 
 
void Time_Step_Water(double CurrWater[][COLUMNS], double NewWater[][COLUMNS], 
 
float evaporation, unsigned int wind)
 
{
 
double oil, stayOil;
 
Init_Water(NewWater, 0.0); // set NewWater to all 0's
 
for(int i = 0; i < ROWS; i++)
 
{
 
for(int j = 0; j < COLUMNS; j++)
 
{
 
oil = CurrWater[i][j] * (1.0 - evaporation); // volume after evaperation
 
stayOil = ( oil * (10.0 / (10.0 + wind))); //oil left in initial square
 
NewWater[i][j] += stayOil; //accumulated oil into NewWater
 
oil = oil - stayOil; //oil moved by wind
 
if(j < ROWS - 1) // if not at the far right
 
{
 
NewWater[i][j + 1] += oil * 0.40; // 40% to immediate right
 
if(i> 0) // if not at top, 20% to northeast
 
NewWater[i - 1][j + 1] += oil * 0.20;
 
if(i < COLUMNS - 1) // if not at bottom, 20% to southeast
 
NewWater[i + 1][j + 1] += oil * 0.20;
 
}
 
if(i > 0) // if not at top, 10%to north
 
NewWater[i - 1][j] += oil * 0.10;
 
if(i < COLUMNS - 1) // if not at bottom, 10% to south
 
NewWater[i + 1][j] += oil * 0.10;
 
}
 
}
 
}
 
 
 
void Copy_Water(double CurrWater[][COLUMNS], double NewWater[][COLUMNS])
 
{
 
for(int i = 0; i < COLUMNS; i++)
 
{
 
for(int j = 0; j < ROWS; j++)
 
CurrWater[i][j] = NewWater[i][j];
 
}
 
}
 
 
 
void Display_Water(double NewWater[][COLUMNS])
 
{
 
for(int i = 0; i < ROWS; i++)
 
{
 
for(int j = 0; j < COLUMNS; j++)
 
{
 
cout << setw(4) << setprecision(0) << fixed;
 
cout << NewWater[i][j] << endl;
 
}
 
}
 
}