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-15 |
-10 |
-5 |
0 |
5 |
10 |
15 |
20 |
0.000 |
0.001 |
0.010 |
0.100 |
1.000 |
CHLa Z-Cusum . |
TP (mg/l) |
SCI CHLa Zcusum Threshold Median TP 75pctl TP |
-25 |
-20 |
-15 |
-10 |
-5 |
0 |
5 |
10 |
15 |
20 |
25 |
30 |
0.001 |
0.010 |
0.100 |
1.000 |
CHLa Z-Cusum . |
TP (mg/l) |
SCM CHLa Zcusum Threshold Median TP 75pctl TP |
-20 |
-10 |
0 |
10 |
20 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
0.000 |
0.001 |
0.010 |
0.100 |
1.000 |
CHLa Z-Cusum . |
TP (mg/l) |
SCO CHLa Zcusum Threshold Median TP 75pctl TP |
SCI |
LAND |
SCM |
SCO |
OFF |
OCEAN |
94 |
Hence, we propose the development of protective nutrient criteria that include |
two limits: LT-L (Long-Term Limit) and UP-L (Upper Limit). The LT-L is the expected |
nutrient concentration in a water body at which no adverse effects would be expected or |
the effects would be insignificant for the type of designated use. The LT-L is equal to the |
nutrient threshold or to the median nutrient concentration if the threshold is larger than |
the median. The UP-L is a nutrient upper bound concentration of the LT-L that accounts |
for natural variability in nutrient drivers, for example annual seasonality and climatic |
variability. The UP-L is the 80th upper confidence limit of a normal distribution with mean |
equal to the threshold and standard deviation equal to the nutrient’s standard deviation |
for the segment under consideration. This limit allows one exceedence in three |
consecutive years. The Type I error rate for both limits is about 10 percent. A summary |
of the calculated criteria is presented in Table 6.2. |
95 |
Table 6.2: Total Phosphorous (TP) and Total Nitrogen (TN) median, Long-Term Limit |
(LT-L) and Upper-Limit (UP-L) concentrations for South Florida coastal and estuarine |
waters. |
Basins Segment TN median TN LT-L TN UP-L TP median TP LT-L TP UPL |
FK MAR 0.165 0.126 0.213 0.007 0.007 0.011 |
BKB 0.219 0.182 0.292 0.007 0.007 0.010 |
BKS 0.200 0.163 0.276 0.009 0.008 0.012 |
LK 0.178 0.178 0.270 0.006 0.005 0.008 |
MK 0.185 0.147 0.244 0.006 0.004 0.007 |
OFF 0.142 0.113 0.198 0.006 0.004 0.008 |
UK 0.158 0.125 0.201 0.005 0.003 0.007 |
BB CS 0.277 0.205 0.307 0.006 0.004 0.008 |
MBS 0.534 0.476 0.656 0.006 0.004 0.007 |
NCI 0.290 0.290 0.397 0.005 0.004 0.008 |
NCO 0.244 0.235 0.344 0.006 0.005 0.009 |
NNB 0.257 0.189 0.304 0.010 0.007 0.012 |
SCI 0.421 0.421 0.598 0.006 0.004 0.007 |
SCM 0.292 0.244 0.382 0.006 0.004 0.008 |
SCO 0.209 0.187 0.283 0.005 0.004 0.007 |
SNB 0.254 0.153 0.246 0.008 0.005 0.008 |
FB CFB 0.869 0.869 1.331 0.015 0.012 0.025 |
ECFB 0.613 0.449 0.652 0.006 0.004 0.009 |
NFB 0.614 0.664 0.882 0.009 0.005 0.010 |
SFB 0.571 0.520 0.781 0.007 0.007 0.012 |
WFB 0.323 0.222 0.408 0.012 0.012 0.025 |
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