MANASOTA & PEACE RIVER BBDs Meeting Notebook 10-21-09.docx

L917
Polk County Lake Bathymetric Mapping
Project Type Cooperative Funding
AOR(s)
Water Supply, Flood Protection, Water Quality, Natural Systems
Basin(s) Alafia River, Hillsborough River, Peace River
Cooperator(s)
Project Manager ZAJAC, CHRIS
Task Manager(s)
Status Ongoing
Polk County, Polk County Natural Resources
Description
This project will complete electronic bottom contours (elevation models) of 75 lakes located in Polk County for
inclusion as a data layer in multi-agency Geographic Information System (GIS) databases. This project will use lake
elevation data that has been previously collected by a District survey consultant and convert it into lake bottom contour
maps and stage volume data. Information relative to lake level monitoring stations and existing public boat ramps will
be included. The deliverables will be uploaded into the County's and District's GIS databases. The updated bottom
contour information will be used for water quality restoration work, water budgets, lake volume calculations, and flood
protection models. Obtaining bottom contours in a digital format will provide a much more accurate calculation of the
lake volume needed for implementation of these type projects. The first phase of this project funded in FY2008
completed bathymetric maps for 48 lakes. Funds requested in FY2010 will be used to map an additional 27 lakes.
Benefits
Digital elevation models of lakes are currently a data gap within various hydrologic studies and analyses. Completed
elevation models are needed to calculate accurate lake volumes and to determine lake water budgets. This
information will be used for SWUCA related hydrologic studies such as the determination of relationships between lake
levels and the Floridan aquifer. The data will also will be used for setting Minimum Flows and Levels (MFLs) of these
lakes.
Costs
The total project cost is $40,000, with the County contributing $20,000 and the District requested to contribute
$20,000. The County and District each contributed $10,000 in FY2008 to complete maps of the first 40 lakes. The
FY2010 funds will be used to complete mapping of the second group of 27 lakes. The District is requested to fund
$10,000 in FY2010 with an equal match by the County. The District's FY2010 share is split between the Peace River
Basin Board ($7,400), Hillsborough River Basin Board ($1,500) and Alafia River Basin Board ($1,100). The District
funding amounts shown in the table include staff salaries, travel and central garage.
Additional Information
The majority of the maps were published over 30 years ago as hard copy files and need to be updated as digital
elevation models that can easily be integrated into modern water resource model applications. The completed maps
will be made available to other governmental agencies and the public via the internet and as part of the Polk County
Lakes Access Directory. Coverage will be countywide and include lakes in the Alafia River, Hillsborough River, and
Peace River Basins.
Prior
Funding
Cumulative FY 2009 FY2010
Transfers Funding Funding
District Budgeted - Ad Valorem Based
Revenue
011 Alafia River Basin 1,100 0 0 1,100
0 2,200
013 Hillsborough River Basin 1,500 0 0 1,500
0 3,000
020 Peace River Basin 10,198 0 1,795 8,403
0 20,396
Project Funds Not Budgeted by the
District
Polk County 10,000 0 0 10,000
0 20,000
020 - Peace River Basin 312
Total:
Future
Funding
Total
Funding
$45,596