Nutrient and Pesticide Accounting in the Chipola River/Floridan Aquifer System - PowerPoint PPT Presentation

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Nutrient and Pesticide Accounting in the Chipola River/Floridan Aquifer System

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Florida Department of ... Maps. Population in 2005. Population Data. 0. 10000. 20000. 30000. 40000 ... County (Ala) Calhoun County. Jackson County. City ... – PowerPoint PPT presentation

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Title: Nutrient and Pesticide Accounting in the Chipola River/Floridan Aquifer System


1
Nutrient and Pesticide Accounting in the Chipola
River/Floridan Aquifer System
A New Study Jointly Funded by U.S. Geological
Survey and Florida Department of Environmental
Protection
By Christy Crandall
2
New Joint Project between FDEP and U.S.
Geological Survey
  • Scheduled to start in January but all of the
    papers are still being signed
  • Hope to start next month

3
STUDY OBJECTIVES
  • Identify significant nutrients and pesticides
    inputs to the Chipola River/Floridan aquifer
    system using existing information
  • Characterize the hydrologic and geochemical
    processes occurring along flowpaths using a
    groundwater flow and tracking model and a
    geochemical model along flow paths.
  • Test 1 or possibly 2 hypothetical
    scenariostracking nitrate and maybe an organic
    compound to the Jackson Blue Spring and the
    Chipola River.

4
BACKGROUND
5
Study Area Location
Chipola Watershed
6
Floridan Aquifer System
  • Vertically contiguous thick sequence of
    limestone and dolostone of late Paleocene to
    early Miocene age
  • Highly potable--drinking water is derived from
    Floridan aquifer system
  • Contains numerous springs, sinks and other karst
    featureshighly vulnerable.

7
The Floridan aquifer and the Chipola River Basin
  • Recharge occurs mainly in unconfined and
    semi-confined areas
  • Potentiometric surfaceflows southward from
    northern extent

8
The Floridan aquifer and the Chipola River Basin
  • Ground water makes up the majority of the
    Chipola River's discharge during low and medium
    flow conditions
  • At least 63 springs identified(Barrios and
    Chellette, 2004)

9
Why are we worried?
  • Higher nitrate concentrations and more
    occurrances of nitrate and pesticides in the
    Chipola River and Floridan aquifer in this area
    than in other areas of the Floridan aquifer
    system (U.S. Geological Survey data).

10
Groundwater Nitrate
Concentrations were highest in ACFB Network Medi
an NO3 ACFB 2.46 SANT 0.05
GAFL2 0.54 GAFL3 0.05 GAFL4 0.06
11
(No Transcript)
12
Number of Dectections
ACF Basin pesticide detections in wells springs
Number of Dectections
13
FDEP Basin Status Report 2002
14
Summary of SW Nutrients and Pesticides from 1995,
USGS
  • Cowarts Creek nr. Cottonwood AL
  • Median nitrate concentration 0.5 mg/L as N
  • Nitrogen, Ammonia Organic, Dissolved 0.25 mg/L
    as N
  • Phosphorus, Total 0.03 mg/L as P
  • Metolachlor 0.03 ug/L
  • Atrazine 0.02 ug/L
  • Chipola River near Altha, FL
  • Median nitrate concentration 0.5 mg/L
  • Nitrogen, Ammonia Organic, Dissolved 0.25 mg/L
    as N
  • Phosphorus, Total 0.03 mg/L as P
  • Metolachlor 0.05 ug/L

15
APPROACH
16
1. Acquire and compile existing data
Water Quality Data FDEP USGS NWFWMD
17
Maps
Land use Aquifer Vulnerability Potentiometric
Surface Stream Aquifer Thickness
18
Population Data
Population in 2005
19
2. Use data to target top 30 source areas for
nutrients and perform reconnaissance field
sampling. Field Parameters Nitrate Bacteria Few
Pesticides?
20
  • 3. Use new data to target 10 most significant
    source areas of nutrients and sample--analyses to
    include major ions, trace elements?, age tracers,
    isotopes, pesticides, etc.,.

21
4. During this time a ground-water flow and
particle-tracking model will be compiled and
calibrated for the Floridan/Chipola aquifer/river
system
22
Start with existing Recent Models
Hal Davis USGS, Tallahassee
  • Lyn Torak
  • USGS, Atlanta

23
  • 5. Track particles along flow lines and identify
    geochemical processes occurring along flowpaths.

24
Flowpaths to a Public Supply Well
25
  • 6. Use the model to test hypothetical scenarios
    such as
  • the effects of changing BMPs
  • or zoning changes on predicted concetrations to
    the Chipola River and Blue Springs (3 to 5
    locations).

26
Summary and Conclusions
  • New USGS MODFLOW CONDUIT FLOW PACKAGE can switch
    between laminar and turbulent flow
  • Project ends in 2009I am hopeful that I may
  • be able to provide some insight on travel time
    from aquifer recharge to river
  • identify some major source areas and vulnerable
    areas
  • and potentially say something about land use
    protection.
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