MAP Technical Reports Series No. 106 UNEP

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Table 5
River Po: Nitrogen and Phosphorus Export by Sub-Basins. (Data: Marchetti)
No. Basin Size
sqkm
0 Upper Po
1 Dora/Stura
2 Orca/Dora B
3 Sesia
4 Tanaro/Scriv
5 Agona-Ticino
6 Staffora
7 Lambro
8 Trebbia
9 Adda
10 Nure
11 Arda-Parma
12 Crostolo
13 Oglio
14 Mincio
15 Secchia
16 Panaro
4,885
2,523
6,532
3,072
9,498
9,020
1,120
3,858
1,396
7,636
1,069
4,457
574
6,693
3,083
2,367
2,191
Population
1,000,000
0.465
1.639
0.343
0.452
1.038
1.084
0.123
4.605
0.040
1.668
0.062
0.578
0.208
1.165
0.348
0.366
0.472
Nitrogen
kg/day
28,189
5,197
4,582
9,384
49,000
23,804
601
40,858
1,277
16,363
677
12,053
1,817
29,129
3,146
9,800
8,072
Sum 69,974 14.656 243,948
N/P:
Phosphoru
s
kg/day
2,196
487
364
887
1,026
944
101
4,869
46
1,324
28
684
183
1,498
270
1,100
1,054
17,061
14.3
N
calc.
14,988
15,837
18,428
19,349
29,916
28,979
3,531
36,365
3,746
28,876
3,050
14,565
2,649
23,591
9,775
8,077
8,247
P
calc.
437
1,541
322
425
976
1,019
116
4,329
38
1,568
58
543
196
1,095
327
344
444
260,967 13,777
Multiple Regressions: Nitrogen:
Regression Output: Regression Output:
Constant
-3423.30 Constant
0
Std Err of Y Est
8842.04 Std Err of Y Est
8766.6
R Squared
0.6878 R Squared
0.6711
No. of Observations
17 No. of Observations
17
Degrees of Freedom
14 Degrees of Freedom
15
Basin: Popul.: Basin: Popul.:
X Coefficient(s) 3.0194 6199.60 X Coefficient(s) 2.5172 5787.7
Std Err of Coef. 0.8117 2106.03 Std Err of Coef. 0.5612 2033.8
t-value
3.720 2.944 t-value
4.486 2.846
Phosphorus:
Regression Output: Regression Output:
Constant
191.68 Constant
0
Std Err of Y Est
613.20 Std Err of Y Est
602.60
R Squared
0.7542 R Squared
0.7456
No. of Observations
17 No. of Observations
17
Degrees of Freedom
14 Degrees of Freedom
15
Basin: Popul.: Basin: Popul.:
X Coefficient(s) 0.0053 916.53 X Coefficient(s) 0.0334 939.59
Std Err of Coef. 0.0563 146.06 Std Err of Coef. 0.0386 139.80
t-value
0.0939 6.275 t-value
0.866 6.721
not sign!
not sign!