A.R.M. Loxahatchee National Wildlife Refuge
Enhanced Water Quality Monitoring and
Modeling
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Report No. LOXA06-003

Enhanced Water Quality Monitoring and Modeling Program for the A.R.M. Loxahatchee National Wildlife Refuge

Quarterly Update Report - April 2006

Prepared by: Matt Harwell, A.R.M. Loxahatchee National Wildlife Refuge

With contributions from Laura Brandt, Leslie MacGregor (NPS), Donatto Surratt, and Mike Waldon

Overview

This update is a summary of activities since the previous status report of January 2006 on the implementation of the Refuge's Enhanced Water Quality Monitoring and Modeling Program. A project overview, and other detailed information about the program can be found at: http://sofia.usgs.gov/lox_monitor_model/. The primary objective of this overall program focuses on providing information for use in ecological management of the Refuge (Brandt et al. 2004; Harwell et al. 2005).

The Refuge's monitoring component of this program also addresses one of the Consent Decree Principals recommendations (17 December 2003):

B. Enhancing Monitoring of the Refuge

Design and implement an enhanced monitoring program to improve spatial and temporal understanding of factors related to phosphorus dynamics.

The Refuge's modeling component of this program also addresses several of the Consent Decree Principals recommendations (17 December 2003):

C. Modeling of the Refuge

  1. Develop a water quality/hydraulic model for the Refuge with a phosphorus cycling component.
  2. Evaluate issues associated with phosphorus loads and transports within the L-40 and L-7 canals.
  3. Develop and track a simple phosphorus mass-balance model for the Refuge.

Information Availability

Through collaboration with USGS, information from the Refuge's Enhanced Water Quality Monitoring and Modeling Program has been made available on the USGS' SOFIA web site at: http://sofia.usgs.gov/lox_monitor_model/.

Final data for monthly samples to date continue to be publicly posted on DBHYDRO by the SFWMD at: (http://www.sfwmd.gov/org/ema/dbhydro/index.html) (new URL: http://my.sfwmd.gov/dbhydroplsql/show_dbkey_info.main_menu).

Monitoring Update (January - March 2006)

Sampling of the enhanced water quality monitoring network (Figure 1) occurred at 34 stations in January 2006, 38 stations in February 2006, and 27 stations in March 2006 (Table 1).

Total phosphorus data for 2005-2006 are presented in Table 1. Maps of TP for January - March 2006 are presented in Figure 2, Figure 3, and Figure 4.

Conductivity sonde deployment information for 2005-2006 is presented in Table 2.

map showing location of Enhanced Water Quality Monitoring network stations, in relation to Consent Decree compliance stations, for the A.R.M. Loxahatchee National Wildlife Refuge January 2006 map of total phosphorus values from the Enhanced Water Quality Monitoring and the Everglades Protection Area stations in the A.R.M. Loxahatchee National Wildlife Refuge
Figure 1. (left) Location of Enhanced Water Quality Monitoring network stations (LOXA###), in relation to Consent Decree compliance stations (LOX##), for the A.R.M. Loxahatchee National Wildlife Refuge. [larger image] Figure 2. (right) January 2006 map of total phosphorus values from the Enhanced Water Quality Monitoring and the EVPA stations in the A.R.M. Loxahatchee National Wildlife Refuge. A primary reason that a station is not sampled is that it has less than 10 cm of clear water column representative of that area. [larger image]


February 2006 map of total phosphorus values from the Enhanced Water Quality Monitoring and the Everglades Protection Area stations in the A.R.M. Loxahatchee National Wildlife Refuge March 2006 map of total phosphorus values from the Enhanced Water Quality Monitoring and the Everglades Protection Area stations in the A.R.M. Loxahatchee National Wildlife Refuge
Figure 3. (left) February 2006 map of total phosphorus values from the Enhanced Water Quality Monitoring and the EVPA stations in the A.R.M. Loxahatchee National Wildlife Refuge. A primary reason that a station is not sampled is that it has less than 10 cm of clear water column representative of that area. [larger image] Figure 4. (right) March 2006 map of total phosphorus values from the Enhanced Water Quality Monitoring and the EVPA stations in the A.R.M. Loxahatchee National Wildlife Refuge. A primary reason that a station is not sampled is that it has less than 10 cm of clear water column representative of that area. [larger image]

screenshot of table 1
Table 1. Click to view full table.

screenshot of table 2
Table 2. Click to view full table.

Modeling Update

Model development continues. The modeling team is also developing simplified water budget and mass budget models for the Refuge and will make presentations about the modeling effort at the June 2006 Greater Everglades Ecosystem Restoration conference.

Water Quality Data Analyses Updates

Water quality analyses continue, including analysis of transect water quality data. The present focus is on data analysis for the 2006 Annual Report. Additionally, presentations about water quality analysis efforts will be made at the June 2006 Greater Everglades Ecosystem Restoration conference.

Next Steps

The next steps for this program continue to focus on data collection and analysis and continuing forward with model development.

References

http://sofia.usgs.gov/lox_monitor_model/

Brandt, L.A., Harwell, M., Waldon, M. (2004) Work Plan: Water Quality Monitoring and Modeling for the A.R.M. Loxahatchee National Wildlife Refuge: 2004-2006. Prepared for the A.R.M. Loxahatchee National Wildlife Refuge. April, 2004. 33 pp.

Harwell, M. Surratt, D., Waldon, M., Walker, B., Brandt, L. (2005) A.R.M. Loxahatchee National Wildlife Refuge Enhanced Water Quality Monitoring and Modeling Interim Report. April, 2005. 106 pp.

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