MAP Technical Reports Series No. 106 UNEP

- 57 -
to 10,000 t/y, while for the same river the authors estimated values as high as 18,000 to 20,000
t/y in wet years. Therefore, load estimates calculated from one or two year data only,
compounded by unreliable measurements of the hydraulic load and infrequent sampling, may
be entirely misleading.
Table 13b
Estimated Total Phosphorus Load to Mediterranean Sea under 3 assumptions
of % diffused source load of total correction for amount
fertilizer used /ha by countries
basic % assumption> Total estimated P-Load estimated
Population generated
actual
% point source 1
t/y F.f.
60%
t/y
40%
t/y
20%
t/y
Albania
France
Greece
Italy
Malta
Monaco
Spain
Yugoslavia
Sub-total
Algeria
Egypt
Libya
Morocco
Tunisia
Sub-total
Cyprus
Israel
Lebanon
Syria
Turkey
Sub-total
1,647
6,367
4,785
30,942
207
15
7,484
1,394
52,841
64%
6,210
8,916
1,233
1,831
2,681
20,871
25%
361
1,558
1,441
624
5,400
9,384
11%
1.23
2.70
1.45
1.49
0.54
0.00
0.66
1.06
0.24
3.13
0.07
0.27
0.15
0.40
1.74
1.04
0.31
0.51
5,387
37,025
17,464
115,261
432
17
17,110
4,159
196,854
66%
9,681
58,468
1,568
2,965
3,774
76,455
26%
662
6,466
4,254
1,048
10,954
23,384
8%
3,446
20,523
10,819
70,996
324
17
12,386
2,739
121,250
66%
8,270
31,682
1,485
2,487
3,390
47,314
26%
525
3,870
2,811
864
8,319
16,388
9%
2,476
12,272
7,497
48,863
270
17
10,024
2,029
83,448
65%
7,565
18,289
1,443
2,248
3,198
32,744
25%
456
2,571
2,090
772
7,001
12,890
10%
Total t/ 83,096 296,693 184,953 129,083
Avg:
Total Load Estimate:
= 1.15*Pop-P* {1 + [basic %/(100 - basic %)]* F.factor}
35%
20%
32%
31%
55%
100%
50%
39%
31%
74%
18%
90%
71%
82%
31%
63%
28%
39%
68%
57%
46%
32%
50%
55%
36%
51%
50%
73%
100%
69%
59%
50%
1 Correspondingly: Actual % diffused load = 100 - % point source load
86%
32%
96%
85%
91%
51%
79%
46%
59%
83%
75%
66%
52%
66%
76%
60%
73%
73%
88%
100%
86%
79%
73%
94%
56%
98%
94%
96%
73%
91%
70%
79%
93%
89%
84%
74%
82%
Unfortunately, the Mediterranean river load estimates are insufficient to make valid
comparisons. Accordingly, stretching the existing information beyond its range of validity is
unavoidable. UNEP (1984) lists water discharge rates and catchment basin size for 69 rivers