X hits on this document

457 views

0 shares

0 downloads

0 comments

50 / 164

of TSI based on water chemistry and submerged nutrient biomass. Question 4 is based on the

assessment and other (including TSI and TSI

watershed and demographic adjusted for biomass) results

factors.

Table

2

of lake assessments

provides

the nutrient

on the six

study lakes.

These and other results from the lake assessments will be used to posed above. All the lakes are clear water lakes and by the current than 40 to be not considered impaired (based on criteria established in

answer the four questions rule must have a TSI less F.A.C 62.303).

Table 1 Group 1 Basin Lake Assessed in 2006 that were listed as impaired

Lake

IWR

303

Impairment

Concentration Causing

Basin

(d)

Impairment

Group

Listed

Nitrogen

Phosphorus

Limiting Nutrient

1

x

1

x

1

x

1

x

1

x

0.01

N and P

0.02

N and P

0.01

N and P

0.01

N and P

0.01

N and P

Calm

Nutrient

0.33

Carroll

Nutrient

0.44

Crescent

Nutrient

0.65

Magdalene

Nutrient

0.67

Mound

Nutrient

0.45

The lake assessment nutrient chemistry results show single case impairment for two lakes and a potential for three lakes to become impaired by that criteria. Additional sampling for at least three of the lakes may provide adequate evidence to remove them from the 303(d) verified list. Lake Crescent should be a lake of concern for the County and consideration for restoration, especially restoration of submerged aquatic plant communities is recommended.

Table 2 Nutrient results from 2006 Lake Assessment for five impaired lakes

Lake

IWR

303 (d)

Impairment

Concentration Causing

Basin

Listed

Impairment

Group

1

x

1

x

1

x

1

x

1

x

Calm

Nutrient

0.41

0.022

Carroll

0.45

0.023

Crescent

0.94

0.035

Magdalene

1.07

0.014

Mound

0.52

0.02

Nitrogen

Phosphorus

42.92

44.72

35.92

38.04

52.32

52.75

37.25

40.79

38.45

43.48

Limiting Nutrient

P P P P P

TSI

TSI Adj

Conclusion

A lake assessment for lakes between 50 and 250 acres requires one day or less to accomplish while those between 250 and 1000 acres take between two and three days to complete using our current methods. The results can assist a County in make critical decisions concerning future management of their lakes.

References

Canfield and Hoyer, J. Aquat. Plant Management, 38: 2000.

Session 1 – Page 3

Document info
Document views457
Page views457
Page last viewedSat Dec 10 11:23:43 UTC 2016
Pages164
Paragraphs2961
Words43681

Comments