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U.S. Geological Survey
Water Resources Discipline, Central Region, Denver, Colorado
156th Committee Meeting
Oct. 17-19, 2006
Eureka Springs, Arkansas
As part of its national mission the United States
Geological Survey (USGS) operates data-collection networks for the purpose of
monitoring the water resources of the United States. Within the Arkansas,
White, and Red River Basins the surface-water sites include about 450
continuous-recording streamflow gages and more than 300 surface-water quality
sampling sites, some of which are equipped with continuous monitors. In
addition, a variety of other sites, such as partial-record stations and
precipitation stations, are also operated. The data collected from these
networks are published annually and can be obtained from individual USGS
District offices as soon as the data are reviewed. Most stations are equipped
with data-collection platforms and provide "real-time data" through satellite
transmission. In addition, the USGS conducts water-resource investigations that
are published periodically.
The Arkansas Water Science Center operates 103
continuous-record streamflow gages, 18 partial-record gages, 8 stage-only gages,
47 rainfall gages, 76 surface-water quality stations (13 of which have
continuous real-time recorders), and 1 NASQAN site in the Arkansas, White, and
Red River Basins. Ground-water levels are being measured in about 500 wells.
Fifteen wells are real-time sites and nine wells are continuous recorder sites.
Approximately 65 wells are sampled for water-quality determinations. A basic
data report is published annually. Ground-water data and potentiometric-surface
reports also are published annually. These data are collected as a part of the
USGS’ Collection of Basic Records program; ongoing cooperative work with local
State and Federal agencies; and in support of the Arkansas River Compact
Commission, the Red River Compact Commission, and the Union County Water
Conservation Board.
Water-quality data are currently being collected at 14
stream sites and 9 lake sites in the White River Basin, 14 stream sites and 5
lake sites in the Arkansas River Basin, and 10 stream sites and 3 lake sites in
the Red River Basin. Water-quality data have been collected and a full
water-quality model for Beaver Lake has been developed and calibrated. The
calibrated model was applied to evaluate how various nutrient and sediment
loading scenarios into Beaver Lake effect the reservoir water quality. A study
was also completed on the occurrence of organic-wastewater constituents in
selected streams in the Illinois, Spavinaw, and White River watersheds that are
influenced by wastewater discharge.
Several interpretive hydrologic investigations are being
conducted in Arkansas. A study to establish a set of regionalized equations to
predict the 2- year and 7-year low-flow for streams in Arkansas is ongoing. Six
USGS Water Resources Investigations Reports documenting results from six
separate ground-w ater flow and optimization models were released at 3 separate
press conferences. These reports are available for download at the USGS website
ar.water.usgs.gov.
The reports documented past and future hydrologic conditions in the Sparta and
alluvial aquifers, as well as sustainable-yield estimates from ground and
surface water. The alluvial aquifer, which is in hydraulic connection with the
lower White and Arkansas Rivers, is an important source of agricultural and
irrigation water. The Sparta is a primary source of water for industrial and
municipal use. Both aquifers have been over pumped and are experiencing massive
cones of depression in some areas.
As a follow up to published ground-water modeling analyses of
the Mississippi River Valley alluvial aquifer, the USGS performed additional
conjunctive-use optimization modeling to assess the impact of varying planned
withdrawals from the White and Arkansas Rivers as part of the Grand Prairie and
Bayou Meto Irrigation Projects. The alluvial aquifer, which is in hydraulic
connection with the lower White and Arkansas Rivers, is an important source of
agricultural and irrigation water. If planned deliveries of water from the
Arkansas and White Rivers are set to zero, and potential additional withdrawals
from other rivers specified within the model are removed, then the long-term
sustainable yield from ground water produced from the alluvial aquifer
increases. An additional analysis of potential ground-water withdrawals from a
site near Pine Bluff, AR adjacent to the Arkansas River showed that about 39
million gallons per day could be produced sustainably, which is more than the
amount of water being pumped from the Sparta aquifer by a large paper mill in
the area.
Model simulations of the impact of proposed pumping from wells
owned by municipalities in Lonoke County were developed by the USGS. The purpose
of the models was to assess future impacts of pumping to water levels in the
Mississippi River Valley alluvial aquifer out to the end of the year 2049.
Water level changes were assessed in a multi-county area surrounding the area of
proposed pumping. Changes in the number of dry cells in the model area after 46
years of pumping were also assessed.
A proposal to study the feasibilty of artificial recharge of the
alluvial aquifer using constructed wetlands in conjunction with specially
constructed trenches, recharge galleries, and wells was developed in conjunction
with staff from Arkansas State University. Potential study site locations are
near Weiner, AR and at the UAPB Experimental Farm near Lonoke, AR.
A computer model of hydrodynamics and dissolved oxygen in
Beaver, Table Rock, Bull Shoals and Norfork Reservoirs has recently been
developed and calibrated to evaluate probable impacts of proposed minimum flow
changes. Water-quality data have been collected and a full water-quality model
for Beaver Reservoir has been developed and calibrated. The calibrated model is
currently being used to evaluate how various nutrient and sediment loading
scenarios into Beaver Lake effect the reservoir water quality. Stream flow and
nutrient flux have been investigated in the Buffalo River and two of its major
tributaries. Recharge area delineation and water quality of four public water
supply springs in north-central Arkansas has recently been investigated.
The Ozark Plateaus National Water-Quality Assessment (NAWQA)
Program, headquartered in Arkansas, includes portions of Arkansas, Kansas,
Missouri, and Oklahoma. Numerous technical reports and fact sheets on ground-
and surface-water quality and aquatic ecology have been published since the
study began in 1991. During the low intensity phase of the Ozark Plateaus NAWQA
program, periodic sampling for nutrients, pesticides, suspended sediment,
fecal-indicator bacteria, sulfate, and chloride, and fish, macroinvertebrate,
and periphyton communities occurred at two to three surface-water sites in the
White River Basin. Six wells in the Springfield Plateau aquifer in southern
Missouri, northern Arkansas, and eastern Oklahoma were sampled for a similar
list of constituents in the springs of 2002 and 2005. A reconnaissance of more
than 60 sites in Arkansas, Missouri, and Oklahoma took place in the summer of
2005. Thirty of these sites spanning a range of nutrient concentrations in
forested and agricultural settings in the White River, Arkansas River, and
Missouri River Basins were sampled during the summer of 2006. Samples were
collected for analysis of nutrients and suspended sediment, periphyton
communities, benthic macroinvertebrate communities, and fish communities. Seven
of these sites will be sampled seasonally for nutrients, suspended sediment,
periphyton, and macroinvertebrates during 2007.
The Colorado Water Science Center currently operates 76
recording streamflow gages and 3 gages on reservoirs within the Arkansas River
Basin. All streamflow stations are equipped with satellite telemetry, which
allows near real-time access to the data through
http://water.usgs.gov.
Continuous recording water-quality monitors are operated at 17 sites. Periodic
water-quality data are collected at 41 surface-water sites, 6 sites in Pueblo
reservoir, and 160 wells. Suspended-sediment data are collected at 31 sites.
Water-level measurements are made annually or more frequently in about 560
wells.
The National Water-Quality
Assessment (NAWQA) Program, High Plains Regional Ground-Water Study started in
October 1998. Studies conducted during the first 2 years of intensive data
collection were located in Kansas, Oklahoma, and the Texas Panhandle north of
Amarillo. These studies included a broad-scale assessment of water quality in
the Ogallala Formation and the Quaternary deposits; an investigation of the
quality of recently recharged ground water under irrigated fields in the
Ogallala Formation and under recent commercial and residential development in
alluvial deposits in Wichita, Kansas; a water-quality comparison study, in which
15 public-supply wells were sampled and compared against 15 nearby domestic
wells; a transect study within the Ogallala Formation along the Kansas/Oklahoma
state line to examine vertical gradients in ground-water chemistry and age; and
unsaturated-zone studies to measure recharge rates and chemical fluxes to the
water table under irrigated fields. Studies conducted during the third year of
intensive data collection were located in the Texas Panhandle south of
Amarillo. These studies included a broad-scale assessment of ground-water
quality in the Ogallala Formation; a transect study within the Ogallala
Formation to examine vertical gradients in ground-water chemistry and age; and
unsaturated-zone studies to measure recharge rates and chemical fluxes to the
water table under irrigated fields. During the fourth year, efforts were split
between an irrigated agricultural (cotton) Land Use Study in the southern High
Plains and several ground-water quality studies in the northern High Plains. The
northern High Plains studies include a broad-scale assessment of the Ogallala
Formation in which approximately 50 domestic-supply wells were sampled during
this initial effort; a transect study that began with the installation of
multiple-completion wells at four sites along a hypothetical flowline, and
unsaturated-zone studies to measure recharge rates and chemical fluxes to the
water table under rangeland and irrigated fields. The work in the northern High
Plains is designed to complement similar work that has taken place in the
central and southern High Plains.
The Kansas District currently
operates 63 continuous-record stream gages, 7 stage only gages, 3 irrigation
ditch gages, 1 lake gage, 10 crest-stage gages, and 3 continuous-record
ground-water level recorders in the Arkansas River Basin. Periodic water levels
are collected at 115 wells in the Arkansas River Basin near Wichita.
Water-quality samples are collected at 4 of the streamflow stations, 3
continuous-record ground-water wells, and 115 short-term project stations.
Continuous-record water quality are logged and transmitted real-time from 4
surface-water stations and 1 lake gage. All continuous-record surface-water and
ground-water stations are equipped with DCP's and most of the streamflow
stations have rain gages installed. Support for these data collection is
provided by USGS, State agencies, other Federal agencies, various local
governments, and the Arkansas River Compact Administration.
A USGS
real-time water quality notification system has been developed in Kansas. Five
of the 14 sites in Kansas are located in the Arkansas River Basin. Information
provided by this system can be used to improve drinking water treatment and to
monitor the environment. The real-time water quality information includes
hourly sensor measurements of streamflow, specific conductance, pH, water
temperature, turbidity, and chlorophyll. Statistical models are then applied to
the hourly values and concentrations of other water quality chemicals can be
estimated, such as fecal coliform bacteria. The hourly values and information
on the real-time water-quality notification system are available on the Internet
at
http://ks.water.usgs.gov/Kansas/rtqw/ .
The
Kansas District is continuing work on a cooperative study with the city of
Wichita to collect and interpret water quantity and quality data for the Equus
Beds Ground-Water Recharge Demonstration Project in south-central Kansas. The
objective of this endeavor is to collect and interpret the data necessary to
evaluate two ground-water recharge and recovery techniques, including the
impacts on water quality, design criteria, and problems associated with
infiltration of streamflow. Interpretation of the results of data collection
activities and evaluation of the effectiveness of the recharge techniques are
being published in a series of articles that can be found at
http://ks.water.usgs.gov/Kansas/equus.
The USGS Kansas Water Science Center is continuing work on
a cooperative study with the City of Wichita and the U. S. Bureau of Reclamation
on water quality in Cheney Reservoir and the surrounding watershed. Cheney
Reservoir serves and both a drinking water supply and a recreational resource
for the City of Wichita. The primary objectives of this study are to: 1)
continue quantification of watershed contributions of nutrients, sediment, total
dissolved solids, and herbicides to Cheney Reservoir, 2) link watershed inputs
with reservoir water quality, and 3) determine relations between reservoir water
quality, algal community structure and dynamics, and cyanobacterial production
of taste-and-odor compounds and toxins. In addition to standard real-time
water-quality monitors nitrate and blue-green algae monitors are also being
utilized for this project. Numerous other reports have been published and are
accessible on the project website at
http://ks.water.usgs.gov/Kansas/qw/cheney.
Historic lead and zinc mining in the tri-state area of
southeast Kansas, southwest Missouri, and northeast Oklahoma has left a legacy
of contaminated streams and surface-water impoundments. An assessment of this
contamination was begun in 2004 as a cooperative study between the USGS Kansas
Water Science Center, U.S. Fish and Wildlife Service, and Kansas Department of
Health and Environment. The initial phase of the study evaluated trace element
concentrations in streambed sediment at 87 locations in the Kansas part of the
tri-state area (a superfund site established in 1983). Concentrations of
cadmium, lead, and zinc in streambed sediment were as large as two orders of
magnitude greater than sediment-quality guidelines for the protection of aquatic
life. The second phase of the assessment will examine the historic accumulation
of trace elements in the bottom sediment of Empire Lake, the largest
surface-water impoundment in the study area.
In 2005, the USGS Kansas Water Science Center and Kansas
Water Office began a cooperative study to evaluate ground-water availability and
quality in the Ozark and Springfield aquifers of southeast Kansas, southwest
Missouri, and northeast Oklahoma. A regional ground-water flow model will be
developed to simulate the effects of existing and proposed municipal and
industrial ground-water withdrawal rates on ground-water levels. Pumping stress
also may induce changes in water quality. Results of this study will help water
managers assess the availability of ground water in their areas, to determine
the effects of pumping on groundwater levels, and to assess the potential for
possible future contamination of wells.
The Louisiana Water Science Center operates 62
continuous-recording stream gages (16 continuous discharge gages, 46 continuous
stage gages), 5 lake and reservoir gages, 21 crest-stage gages, 27 flood-profile
gages stations in the Red River Basin. As part of the Louisiana real-time
monitoring network, 41 of the continuous gages have Data Collection Platforms (DCP’s),
and 32 sites have rain gages. Included in the real-time network are 19
stage-rain gages in the Caddo-Bossier Parish area near Shreveport, Louisiana.
The Louisiana District operates a statewide ground-water-level and quality
network of which 71 water-level sites and 20 water-quality sites are located in
the Red River Basin..
The Missouri Water Science
Center currently operates 34 continuous-record streamflow gages, 5 stage-only
gages, 5 crest-stage gages, and 21 rain gages in the White and Arkansas River
Basins. Water-quality data are collected at 33 sites in the White and Arkansas
River Basins. Continuous-record dissolved oxygen and water temperature data are
collected from July through December at two surface-water stations. These data
collection efforts are done in cooperation with local, state, and other federal
government agencies. The center has three investigative studies underway in the
Missouri part of the basin, a surface-water quality study of the Elk River
basin, a ground-water model in the Springfield, Missouri area, and a
source-water assessment of springs and streams along the Current and Jacks Fork
Rivers in the ONSR (Ozark National Scenic Riverways).
Elk River study - Confined animal feeding operations, land application of
manure, excessive fertilizer use, leaking septic tanks, and urban runoff are
suspected of degrading the water quality, with respect to nutrient
concentrations, in the Elk River Basin. The USGS is conducting a study to
determine which sub-basins in the Elk River Basin are contributing the largest
volume of nutrients to the system and to determine the source(s) of the
nutrients. The study includes storm-runoff, routine water-quality, and sediment
sampling. In addition to nutrients and fecal bacteria, selected sites are
monitored for pharmaceuticals. The data will be used by resource managers as
part of a phase II total maximum daily load assessment. The findings of this
study are scheduled to be published by October 1, 2007.
ONSR source-water assessment -Beginning in 2005, the USGS begin a three-year
source-water assessment of springs and streams in the Ozark National Scenic
Riverways. Project tasks include conducting a geohydrologic investigation to
better define the extent and locations of spring recharge areas, an inventory of
potential contaminant sources in spring recharge areas and the Current and Jacks
Fork watersheds, and to develop and implement, with the National Park Service, a
methodology for integrating information about the number, type, and distribution
of potential contaminant sources. The findings of this study are scheduled to
be published by October 1, 2008.
Greene County ground-water model -In October 2006, the USGS began a
ground-water modeling study of Greene County, Missouri. The model will include
the surficial and deeper aquifer in the region and stream and spring flows. The
study in being conducted in cooperation with the Greene County Resource
Management District and the U.S. Army Corps of Engineers, Little Rock District.
The New Mexico Water Science
Center, within the Arkansas River Basin, operates 18 continuous-record
streamflow gages, 4 lake or reservoir gages, and 3 water-quality sampling
sites. In addition, data was collected at 15 crest-stage partial record sites.
Ground-water data are collected semi-annually at 10 wells, and at 5-year
intervals at about 190 wells.
Currently, there are no interpretive studies within the Arkansas or Red River
basins.
The Oklahoma Water Science Center is located within the
Arkansas and Red River Basins and collects surface-water and discharge data from
148 continuous recording stream gages, 21 lake and reservoir gages, and 32 other
surface-water sites. Surface-water-quality data are collected at 25 continuous
monitoring sites and 31 miscellaneous sites. Event-flow water-quality samples
are collected at 19 surface-water stations in five separate basins.
Ground-water levels are measured at 4 continuous sites and annually at 250
wells. Four surface-water and two ground-water sites were added this year.
A
continuing study within the Norman Landfill Research Site is a study of a small
wetland that overlies the leachate plume. Many closed landfills are located on
alluvial deposits near rivers and a large number of those landfills are near
wetlands. Research at other sites has shown that wetlands may be able to reduce
contaminant concentrations. The wetland at Norman Landfill overlies the
leachate plume, and leachate-contaminated ground water interacts with the
wetland. We are studying the exchange of water between the wetland and the
leachate-contaminated ground water to determine if the wetland reduces the
contaminant concentrations.
The World
Wide Web site about Norman Landfill can be viewed at:
http://water.usgs.gov/nrp/organic/norman.htm
The study
determining Trends in Peak Flows of Selected Streams in Oklahoma has been
published. This study has determined whether significant trends exist in the
magnitude of annual peak discharge and mean-annual flow.
A study has begun in cooperation with the Oklahoma Department of
Transportation to develop an internet-based web-based application (StreamStats)
for Oklahoma. It will:
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Automatically
measure basin and climatic characteristics for ungaged sites using GIS;
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Provide
published streamflow statistics, basin and climatic characteristics, and
other information for data-collection stations contained in published
streamflow statistsics reports.
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Provide
estimates of flood-frequency statistics, basin and climatic characteristics,
and other information for user-selected points on ungaged streams; and
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Link to USGS
NWIS on line data.
The USGS, Oklahoma Water Science Center, in cooperation
with the Osage Tribe, Department of Energy, and U.S. Environmental Protection
Agency is investigating the effects of hydrocarbons and produced water (brines)
on soil and ground and surface water (Osage-Skiatook Petroleum Environmental
Research Project). These findings will help mitigate effects of those products
at similar sites throughout the nation. Information can be viewed on the USGS,
Oklahoma Center home page at:
http://ok.water.usgs.gov/public/skiatook
The
investigation at Tar Creek Super Fund Site in cooperation with Oklahoma
University the Oklahoma Department of Environmental Quality has been completed.
Following the release of a multi-agency study on the potential hazard of
subsidence in the Picher Mining District a buyout of residences is being
offered. Virtually all funds have been diverted to the buyout effort resulting
in a cessation of remedial work and investigations. USGS has participated in
multiple projects at Tar Creek and operates three water-quality and surface
water gages in the area. EPA has agreed to fund two surface-water gages on Tar
Creek and the remaining gage on Beaver Creek is not supported at this time.
The study
for Production Well-Head Arsenic Remediation in Western Cleveland County,
Oklahoma, continues in cooperation with U.S. Environmental Protection Agency
(EPA), Oklahoma State University (OSU), the City of Norman and the U.S.
Geological Survey (USGS). This is a 2-year research program investigating the
source, transport, and chemistry of naturally-occurring arsenic in the Central
Oklahoma (Garber-Wellington) Aquifer. This year, USGS is collecting
depth-dependent samples in 10 marginal City of Norman production wells to
determine the depths that are contributing arsenic. This new technology,
developed by the USGS, allows sampling from public-supply well during normal
operation. In early October, USGS drilled a 730-foot test hole and retrieved
rock and zonal water samples from the lower 430 feet. The purposes of the test
hole are: 1) to quantify the amount of arsenic in water at different sand zones
in the multilevel aquifer, 2) to test the predictive ability of geohydrologic
models proposed by Oklahoma State University, and 3) to collect rock core for
use in EPA laboratory experiments. The information generated from this research
may help local municipalities remediate public-supply wells, as well as site
future production wells in areas where arsenic poses no risk. The project field
work has been completed in late 2005 and the report is in final review in 2006.
The
Characterization of the Ada-Vamoosa Aquifer on the Osage Reservation study is to
characterize areas of maximum potential well yield in the Ada-Vamoosa aquifer in
the Osage Reservation. The USGS will use existing hydrologic data from wells in
the aquifer and perform aquifer recovery tests on selected wells to construct a
map of the potential well yield based on specific capacity and hydraulic
conductivity.
The
Oklahoma Water Science Center continues working with the Oklahoma Water
Resources Board, Oklahoma State University, the University of Oklahoma, the
Oklahoma Geological Survey, and the U.S. Environmental Protection Agency
National Ground-Water Risk Management Laboratory, Ada, OK, in an investigation
of the Arbuckle-Simpson aquifer in southern Oklahoma. The Arbuckle-Simpson
aquifer study is funded by the Bureau of Reclamation and the State of Oklahoma.
The USGS is constructing a ground-water flow model to test water management
options for the aquifer. The USGS recently published the results of an
investigation of the gravitational field near Chickasaw National Recreation Area
near Sulphur:
Scheirer,
Daniel S.; Scheirer, Allegra Hosford, 2006, Gravity investigations of the
Chickasaw National Recreation Area, south-central Oklahoma: U.S. Geological
Survey Open-File Report 2006-1083.
This
publication can be found at:
http://pubs.er.usgs.gov/usgspubs/ofr/ofr20061083
The
Arbuckle-Simpson aquifer study is funded by the Bureau of Reclamation and the
State of Oklahoma.
The USGS,
Oklahoma Water Science Center in cooperation with the USDA, Agricultural
Research Service, Grazing Lands Research Lab has begun studying Nutrient
Constituent Loading in the Fort Cobb Reservoir Drainage Basin. The purpose is
to monitor inflow to Fort Cobb Lake, land use changes, and nutrient and sediment
loading of major tributaries under the National Resources Conservation Service
Conservation Environmental Assessment Project. This will quantify varying
changes in conservation practices and stream-flow chemical loading. A digital
atlas is currently being compiled for the Fort Cobb Reservoir Basin that will
include; biological, water, chemical, land use, etc. The information will be in
cooperation with the ARS and other agencies.
The Texas Water Science Center
operates 34 continuous record streamflow stations, 1 flood-hydrograph
partial-record station, 21 continuous record stage reservoir stations, and 1
continuous record stage and contents reservoir station in the Arkansas and Red
River Basins. Four of the continuous record stations are in the Canadian River
Basin (subbasin of the Arkansas River Basin) and the remaining are in the Red
River Basin. Periodic chemical-quality data are available for 13 stations
located in the Red River Basin and one site, Canadian River near Amarillo, in
the Arkansas River Basin. The number of periodic sampling sites will slightly
increase above 2006 levels. Continuous record temperature and conductivity data
are available for 13 stations located in the Red River Basin and one site,
Canadian River near Amarillo, in the Arkansas River Basin. Many of the water
quality and streamflow sites are associated with the Chloride Control Project,
Corps of Engineers, Tulsa.
The
Arsenic Study of Lake Arrowhead will continue in 2007. Arsenic is a drinking
water concern for public water supply entities. The study began in 2006 on Lake
Arrowhead and included monthly water quality sampling of the reservoir,
beginning in January and ending in September. Several lake sediment cores were
collected during late summer. The sediment cores were sampled at intervals
approximating the sedimentation rate and analyzed for Arsenic and selected trace
metals. Chemical analysis of the sediment cores will help define water-quality
trends in the reservoir. Streamflow water quality samples were alsocollected
from tributaries to help identify sources of arsenic during high flow and low
flow conditions.
Annually,
three (winter, spring, summer) water-quality surveys are conducted on Wright
Patman Lake near Texarkana, TX for the Fort Worth Corps of Engineers. Three
inflow sites and one outflow site are included in the lake survey. Data
collected provide a means to evaluate temporal water quality changes in Wright
Patman and are used by regulatory agencies evaluating water quality standards
for the reservoir.
Additional water-quality data are being collected and analyzed for the Red River
Authority's Clean Rivers Program monitoring plan. Data include a water-quality
continuous monitor and sampling for major ions, bacteria, and nutrients 4 times
per year at 1 site.
A study
will begin in 2007 to determine streamflow quantity and water quality (bromide
concentrations, bromide loads, and salinity) of the Red River from Lake Texoma
to the Arkansas border at selected locations. Water-quality samples will
collected during high-flow and low-flow events in order to cover all ranges of
streamflow experienced during the 2 year period. High-flow sampling is very
important in determining loads because the majority of loads, for many
constituents, are transported during high-flow events. This approach would
utilize a network of stream gages, continuous water-quality monitors, and
periodic discrete sampling. Sample analysis will consist of bromide and common
anions/cations. Bromide concentrations will also be determined for Lake Texoma
temporally and spatially through surveys at eight sites in the lake. Bromide
concentrations would be determined from discrete samples in the water column
selected on attendant observations of dissolved oxygen, pH, specific
conductance, and temperature. Three lake surveys are planned: early spring,
summer (during anoxic conditions), and after a significant storm event in the
Lake Texoma region.
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