HYDROLOGY AND
WATER CHEMISTRY CHANGES

DANUBE RIVER

Water inflow

 (cm/s)

P(PO4)

 (mg/l)

N(NO3)

 (mg/l)

P(PO4) inflow

tons/year

N(NO3) inflow

tons/year

DELTA  ECOSYSTEMS

Before 1960

1971-1980

1980-1989

309

359

620

<0.01

0.06

0.07

0.4

1.5

1.5

100

700

             1,400

4,000

17,000

              29,300