T   streeter-phelps model                             title field 
F 33 10000.0 5  time step and inner iterations
G 1 81 4 4 1     grid and array sizes
G 3 0.000000 33.333333 66.666667 100.000000      vertical grid distribution
G 18 1 1 2 4 2 4 0 0.000015 0.0  inflow of bod
G 18 1 1 2 4 2 4 1 0.0 0.0 inflow of osd (zero)
W 1 50.0 150.0 5.0 manning's value, disharge and downstream waterlevel
W 2 3 1 40 81
K 1 40000 60000
K 2 0 1
F 50 2 two constituents
Q 0 0 bio_oxygen_demand    name
Q 0 1 oxygen_satur_def     name
Q 2 0 0 -0.000055   degradation
Q 2 1 0 0.000055     degradation
Q 1012 1 1 -0.00041667    reaeration at surface