Environmental Characteristics and Geographic ...

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Environmental Characteristics and Geographic Information System Applications for the Development of Nutrient Thresholds in Oklahoma Streams Water-Resources Investigations Report 02–4191 Prepared in cooperation with the OKLAHOMA WATER RESOURCES BOARD U.S. Department of the Interior U.S. Geological Survey

Transcript of Environmental Characteristics and Geographic ...

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Environmental Characteristics and GeographicInformation System Applications for the Developmentof Nutrient Thresholds in Oklahoma Streams

Water-Resources Investigations Report 02–4191

Prepared in cooperation with theOKLAHOMA WATER RESOURCES BOARD

U.S. Department of the InteriorU.S. Geological Survey

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Masoner, J.R., and others—

Environmental Characteristics and G

IS Applications for D

evelopment of N

utrient Thresholds—U

SGS/W

RIR 02–4191

Printed on recycled paper

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U.S. Department of the InteriorU.S. Geological Survey

Environmental Characteristics andGeographic Information SystemApplications for the Development ofNutrient Thresholds in Oklahoma Streams

By Jason R. Masoner1, Brian E. Haggard2, and Alan Rea1

1 U.S. Geological Survey2 U.S. Department of Agriculture, Agriculture Research Service

Prepared in Cooperation with the OKLAHOMA WATER RESOURCES BOARD

Water-Resources Investigations Report 02–4191

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U.S. Department of the InteriorGale A. Norton, Secretary

U.S. Geological SurveyCharles G. Groat, Director

For sale by U.S. Geological Survey, Information ServicesBox 25286, Denver Federal CenterDenver, CO 80225

District ChiefU.S. Geological Survey202 NW 66 St., Bldg. 7Oklahoma City, OK 73116

For more information about the USGS and its products:Telephone: 1-888-ASK-USGSWorld Wide Web: http://www.usgs.gov/

Information about water resources in Oklahoma is available on the World Wide Web athttp://ok.water.usgs.gov

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not implyendorsement by the U.S. Government.

Although this report is in the public domain, it contains copyrighted materials that are noted in the text.Permission to reproduce those items must be secured from the individual copyright owners.

UNITED STATES GOVERNMENT PRINTING OFFICE: OKLAHOMA CITY 2002

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Contents

Abstract. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Purpose and scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Environmental characteristics and GIS applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Drainage-basin areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Stream order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Immediate stream-channel slope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Land use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Selected references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1. Environmental characteristics for each of the 798 water-quality sites in Oklahoma. . . . . . . . . . . . . . . . . . 15

Figures

Figure 1. Map showing locations of water-quality sites, study area, and geographic scope of data sets used todetermine environmental characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Figures 2-7. Diagrams showing:2. Flow-direction grid using a coding structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53. Flow-accumulation grid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54.Portionof theNationalHydrographyDataset (2001) inOklahomaemphasizingthevarying

stream density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65.SynthetichydrographycreatedfromtheNationalElevationDataset (2001)showingthe

consistent stream density used to calculate stream order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66. Method of designating stream order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77. Method of designating immediate stream-channel slope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Tables

1.OriginalNationalLandCoverDataset (NLCD) land-usecategorysystemkeyandreclassified land-usecategory system key used in report to compute land-use proportions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2.Summarytableof thereclassified land-usecategorysystemkey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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Conversion Factors and Datum

Vertical coordinate information is referenced to North American Vertical Datum of 1988 (NAVD88).

Horizontal coordinate information is referenced to North American Datum of 1983 (NAD 83).

Multiply By To obtain

Length

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Area

square foot (ft2) 0.09290 square meter (m2)

square mile (mi2) 2.590 square kilometer (km2)

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Environmental Characteristics and GeographicInformation System Applications for the Development ofNutrient Thresholds in Oklahoma Streams

By Jason R. Masoner, Brian E. Haggard, and Alan Rea

Abstract

The U.S. Environmental Protection Agency has developednutrient criteria using ecoregions to manage and protect riversand streams in the United States. Individual states and tribes areencouraged by the U.S. Environmental Protection Agency tomodify or improve upon the ecoregion approach. The Okla-homa Water Resources Board uses a dichotomous process thatstratifies streams using environmental characteristics such asstream order and stream slope. This process is called the UseSupport Assessment Protocols, subchapter 15. The Use SupportAssessment Protocols can be used to identify streams threat-ened by excessive amounts of nutrients, dependant upon a ben-eficial use designation for each stream. The Use SupportAssessment Protocols, subchapter 15 uses nutrient and environ-mental characteristic thresholds developed from a study con-ducted in the Netherlands, but the Oklahoma Water ResourcesBoard wants to modify the thresholds to reflect hydrologic andecological conditions relevant to Oklahoma streams and rivers.

Environmental characteristics thought to affect impair-ment from nutrient concentrations in Oklahoma streams andrivers were determined for 798 water-quality sites in Oklahoma.Nutrient, chlorophyll, water-properties, and location data wereretrieved from the U.S. Environmental Protection AgencySTORET database including data from the U.S. GeologicalSurvey, Oklahoma Conservation Commission, and OklahomaWater Resources Board. Drainage-basin area, stream order,stream slope, and land-use proportions were determined foreach site using a Geographic Information System. The methods,procedures, and data sets used to determine the environmentalcharacteristics are described.

Introduction

The U.S. Environmental Protection Agency has developednutrient criteria using ecoregions to manage and protect riversand streams in the United States from impairment (Robertson,Saad, and Wieben, 2001). Individual states and tribes areencouraged by the U.S. Environmental Protection Agency tomodify or improve upon the ecoregion approach. (Robertson,Saad, and Wieben, 2001). The Oklahoma Water ResourcesBoard (OWRB) developed a dichotomous process that stratifiesor groups streams using environmental characteristics such as

stream order and stream slope to identify streams that need fur-ther study to determine if they are impaired (OWRB, 2001).This process is called the Use Support Assessment Protocols,subchapter 15 (USAP). The OWRB is using nutrient and envi-ronmental characteristic thresholds developed in the Nether-lands (Peters and Gardeniers, 1998; OWRB, 2001). The USAPcan be used to identify streams threatened by excessive amountsof nutrients, dependant upon a beneficial use designation foreach stream. Nutrient criteria are not synonymous with water-quality standards. The purpose of the USAP is to identifystreams, based on nutrient and environmental characteristicthresholds for each stream, that may be threatened by excessiveamounts of nutrients and impairment of their beneficial use.Further studies would be required to determine if water-qualitystandards are exceeded.

The U.S. Geological Survey, in cooperation with the Okla-homa Water Resources Board, is providing descriptive statisticsof water-quality sampling sites that can be used to modify theUSAP to reflect hydrological and ecological conditions relevantto Oklahoma streams and rivers. Four environmental character-istics -- drainage-basin area, stream order, stream slope, andland-use proportions -- that affect nutrient concentrations inOklahoma streams were compiled using a Geographic Informa-tion System (GIS) and are provided in appendix 1 (back ofreport). These characteristics, when used in conjunction withwater-quality data collected from Federal, State, tribal, andlocal programs, will help evaluate streams in Oklahoma andthrough statistical models, help determine which streams arenutrient threatened.

Purpose and Scope

This report describes the methods, procedures, and datasets used to determine environmental characteristics and pro-vides a list of the environmental characteristics (appendix 1,back of report) that can be used to help modify the USAPthresholds to represent hydrological and ecological conditionsrelevant to streams in Oklahoma. Nutrient, chlorophyll, water-properties, and location data were retrieved for 798 water-qual-ity sites from the U. S. Environmental Protection AgencySTORET database (U.S. Environmental Protection Agency,2001), the Oklahoma Conservation Commission, and the Okla-homa Water Resources Board. STORET included data col-lected by the U.S. Geological Survey.

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The 798 water-quality sites are located in Oklahoma, butthe geographic scope of the data sets used to derive environ-mental characteristics included the Arkansas-Red River drain-age basins, an area of about 202,000 square miles (fig. 1). Thereare many sampling sites listed in appendix 1 that are reported ashaving different site identification numbers but have identicallatitude and longitude coordinates. This is because there aremultiple federal and state agencies collecting and maintainingindependent water-quality databases that use different proce-dures for designating site identification numbers. This reportprovides environmental characteristics for each water-qualitysite so that the agencies responsible for maintaining a particularsite would have access to environmental characteristics throughthe site identification number. The water-quality sites are notlabeled on figure 1, as many of the sites are extremely closetogether and the purpose of this report is to provide the environ-mental characteristics and to describe the methods, procedures,and data sets used to determine the environmental characteris-tics.

Acknowledgments

The authors thank Robert Tortorelli, Evan Hornig, andLyn Osburn of the U.S. Geological Survey for their contribu-tions to this report.

Environmental Characteristics and GISApplications

Drainage-basin areas

Drainage-basin areas for 798 water-quality sites in Okla-homa were determined from several data sources using ARC/INFO (ESRI, 2001a) and ARC/VIEW (ESRI, 2001b) GISapplications. Topographic data sets of flow direction and flowaccumulation were used to delineate drainage basins. Flow-direction and flow-accumulation data sets were created from ahydrologically conditioned Digital Elevation Model (DEM)with a 60-meter cell size. The DEM was created from elevationdata (hypsography) and stream data (hydrography) from digitalversions of the U.S. Geological Survey 1:100,000-scale topo-graphic maps (Cederstrand and Rea, 1995).

Development of flow-direction and flow-accumulationdata sets is an important step in delineating drainage basinsusing DEMs. A flow-direction data set (fig. 2) contains cell val-ues that indicate the direction water will flow out of each cellbased on elevation (Jenson and Domingue, 1988). A codingstructure developed by Jenson and Domingue, (1988) codescells based on the orientation with respect to one of the eightneighboring cells. The coding structure uses slope calculationsbetween neighboring cells to code individual cells. Slope is cal-culated from the change in elevation between cells divided bythe distance between cell centers. The distance between cell

centers for diagonal cells is measured by multiplying the cellsize by the square root of two.

The flow accumulation grid (fig. 3) contains cellvalues computed from the flow direction grid that equalthe number of cells that flow into it. Cells having a flowaccumulation value of zero (to which no other cells flow)generally correspond to the pattern of ridges (Jenson andDomingue, 1988). Cells that have many other cellsflowing into it usually are representative of streams orrivers.

The ARC/INFO GRID module was used to delin-eate drainage basins and compute corresponding basinareas (ESRI, 2001a). Individual water-quality sites wereused to define a pour point (an outlet for a drainage area)from which a complete or partial drainage basin wascreated. An automated process was developed that itera-tively selected a water-quality site, converted it into apour point, snapped the pour point to cells of high flow-accumulation, and delineated a drainage basin for thatsite. The RESELECT command selected a single water-quality site and the POINTGRID command converted thepoint into a grid point. The SNAPPOUR commandadjusted the points to cells of high flow accumulation andthe WATERSHED function delineated the drainage areausing the flow-accumulation and flow-direction data sets.

A partial drainage basin was created when thedrainage basin for a water-quality site extended beyondthe coverage of the flow-direction and flow-accumulationdata sets of Cederstrand and Rea (1995), which werelimited to a small margin around Oklahoma. Additionaltechniques using the ARC/VIEW GEOPROCESSING(ESRI, 2001b) extension were used to complete drainagebasins. Partial drainage basins were completed byappending the most detailed digital hydrologic unit mapsavailable for that area. Two hydrologic unit data sets,Seaber and others (1984) and Kansas Data Access andSupport Center (2000), were used to complete partiallydefined drainage basins. The UNION operation appendedthe partially defined drainage basin and the hydrologicunit maps. The DISSOLVE operation eliminated smallsliver polygons created from the UNION operation. Thismethod resulted in one polygon unit that represented thedrainage-basin area. Drainage-basin areas for each water-quality site are listed in appendix 1 (back of report).

Stream Order

Stream order was calculated using methods developed byStrahler (1952) and a stream data set created from a hydrologicderivative (flow accumulation) of the U.S. Geological SurveyNational Elevation Dataset (NED). NED is spatially referencedin a geographic coordinate system using degrees, minutes, and

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Figure 1. Locations of water-quality sites, study area, and geographic scope of data sets used to determine environmental characteristics.

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Environmental Characteristics and GIS Applications 5

Figure 2. Flow-direction grid using a coding structure developed by Jenson and Domingue (1988), modifiedfrom Environmental Systems Research Institute (2001a).

Figure 3. Flow-accumulation grid (modified from Environmental Systems Research Institute,(2001a).

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seconds as units of measurement. NED is based on 1:24,000-scale topographic maps and has a resolution of one arc-second(equivalent to 30 meters). The NED data were projected to anAlbers Equal Area projection and resampled to a 30-meter pixelresolution. Flow-direction and flow-accumulation data setswere created for the Arkansas-White-Red River basin (fig. 1)using the FILL, FLOWDIRECTION, and FLOWACCUMU-LATION functions (Elevation Derivatives for National Appli-cations, 2001). These data sets (hydrologic derivatives of theNED) are similar to derivatives of the 60-meter DEM developedby Cederstrand and Rea (1995) used to delineate drainagebasins.

The stream network needs to have a constant stream den-sity and include all upstream headwaters to calculate streamorder. Stream density can be expressed as a measure of close-ness between stream channels. A stream network that varies instream density will produce higher stream order values in moredense areas and lower stream order values in less dense areas.Figure 4 shows U.S. Geological Survey 1:100,000-scale topo-graphic quadrangle boundaries and the National HydrographyDataset (NHD) (2001). The varying stream density is shownin the upper Bristow quadrangle in relation to stream density inthe lower Shawnee quadrangle. This variation in stream densityis due to varying detail during the digitizing process.

A detailed and consistent stream network was createdusing the ARC/INFO GRID function STREAMLINE to con-vert the raster linear network (flow accumulation) to a vectorlinear network (synthetic hydrography) that represented

streams at a consistent density (fig. 5). The synthetic hydrogra-phy data set was created using a threshold of 5,000 30-metercells from the flow accumulation grid. Cell threshold has adirect affect on the length of headwater streams and minimumsize of drainage-basin areas that can be delineated. The mini-mum size drainage basin that could be delineated based on athreshold of 5,000 30-meter cells is 1.7 square miles. Increasingor decreasing the cell threshold directly affects the length of thesynthetic hydrography. Although the derived synthetic hydrog-raphy is based on 1:24,000-scale topographic maps, derived 1storder streams, in areas of low topographic relief, may actuallybe a 2nd order stream when manually determined using1:24,000-scale topographic map. In areas of high topographicrelief, stream order values derived using the synthetic hydrog-raphy were consistent with stream order values determinedmanually using 1:24,000-scale topographic maps.

A program was used to assign stream order values forstreams in the synthetic hydrography data set using methodsdeveloped by Strahler (1957; fig. 6).

The beginning or headwater streams are designated asfirst-order streams. A second-order stream is formed when twofirst-order streams intersect; when two second-order streamsintersect, a third-order stream is formed; and so forth. TheARC/INFO NEAR command was used to locate the streamnearest to a water-quality site and transfer the stream ordervalue to the water-quality site. The derived stream order valueswere transferred to the environmental characteristic data set(appendix 1, back of report).

Figure 4. Portion of the National Hydrography Dataset (2001)in Oklahoma emphasizing the varying stream density.

Figure 5. Synthetic hydrography created from the National Eleva-tion Dataset (2001) showing the consistent stream density used tocalculate stream order.

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Environmental Characteristics and GIS Applications 7

Figure 6. Method of designing stream order (modified from Strahler, 1957, p. 344).

Immediate Stream-Channel Slope

The immediate stream-channel slope is defined in thisreport as the change in elevation between beginning and endingpoints of a stream segment divided by the length of the streamsegment. The average length of a stream segment used to com-pute the immediate stream-channel slope was 1.75 miles. Theminimum and maximum lengths used were .31 mile and 3.1miles, respectively. Stream slope varied slightly when checkedagainst slope values determined manually from 1:24,000-scaletopographic maps.

Basin characteristics such as stream slope can be problem-atic because the length measured is highly dependent on scaleor in this case, dependent on the cell threshold used to createsynthetic hydrography. Flow-accumulation data sets, and theDEM created by Cederstrand and Rea (1995) were used to cal-culate the immediate stream-channel slope for each of the 798water-quality sites. The “Drainage-basin areas” section of this

report provides specific information about topographic data setscreated by Cederstrand and Rea.

A vector linear network that represented Oklahomastreams was created from the flow-accumulation data set usingthe ARC/INFO GRID function STREAMLINE. The flow-accumulation and flow-direction data sets created by Ceder-strand and Rea (1995) were designed specifically for definingwatersheds; therefore, the corresponding stream network isvery dense and file size is very large. To decrease file size andreduce processing times, the ARC/INFO BUFFER commandwas used to select only the streams within a 5,000-meter dis-tance from the water-quality sites (fig. 7). This methoddecreased the number of arcs from 567,727 to 58,794 arcs.

The NODEPOINT command was used to create points foreach node in the stream data set. A node is defined as the begin-ning or ending point of a line; therefore, any confluence ofstreams would be represented as a node. A unique identificationcode for each point was used that linked the points back to

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Figure 7. Method of designating immediate stream-channel slope.

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Environmental Characteristics and GIS Applications 9

the nodes in the stream data set. The LATTICESPOT com-mand was used to overlay the point data onto the DEM andinterpolate an elevation value from the underlying neighboringcells. The elevation values were transferred from the point dataset to nodes in the stream data set using the RELATE andMOVE commands.

The CALCULATE command was used to compute thechange in elevation between nodes, divided by the distancebetween nodes. This calculation resulted in the immediatestream-channel slope for stream segments near water-qualitysites (fig. 7). The NEAR command was used to locate the near-est stream segment for each water-quality site and transfer theslope value to the water-quality data set. The stream slope val-ues were transferred to the environmental characteristic data set(appendix 1, back of report).

Land Use

Land-use proportions were computed for each of the 798drainage-basin areas using the ARC/INFO GRID module andland-use information from the National Land Cover Dataset(NLCD) (2000). The NLCD is based on 30-meter Landsat The-matic Mapper (TM) data acquired by the Multi-ResolutionLand Characterization (MRLC) Consortium. The base data setfor the NLCD project was compiled using leaves-off LandsatTM data, nominal-1992 acquisitions and other ancillary leaves-on Landsat TM data. The NLCD data set consists of 21 land-usecategories (table 1). These land-use categories were aggre-gated to produce a land-use data set that consisted of 11 land-use categories (table 2).

Table 1. Original National Land Cover Dataset (NLCD) land-use category system key and reclassifiedland-use category system key used in report to compute land-use proportions

[n/a, not applicable]

NLCDkey

Land-use category descriptionsKey usedin report

11 Open water 1

12 Perennial ice/Snow 1

21 Low-intensity residential 2

22 High-intensity residential 2

23 Commercial/Industrial/Transportation 2

31 Bare rock/Sand/Clay 3

32 Quarries/Strip mines/Gravel pits 3

33 Transitional 3

41 Deciduous forest 4

42 Evergreen forest 4

43 Mixed forest 4

51 Shrubland 5

61 Orchards/Vineyards/Other n/a

71 Grasslands/Herbaceous 6

81 Pasture/Hay 7

82 Row crops 7

83 Small grains 8

84 Fallow 9

85 Urban/Recreational grasses 10

91 Woody wetlands 11

92 Emergent herbaceous wetlands 11

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Table 2. Summary table of the reclassified land-use category system key

Resampledkey usedin report

Land-use category description

1 Water

2 Developed lands

3 Barren

4 Forest upland

5 Shrubland

6 Grasslands/Herbaceous

7 Pasture/Hay

8 Row crops/Small grains

9 Fallow

10 Urban/Recreational grasses

11 Wetlands

A land-use data set was compiled for the Arkansas-White-Red River basin (fig.1). The ARC/INFO MASK command wasused to clip out land-use information for each drainage basin.This method produced a land-use data set for each drainagearea. Land-use proportions within each drainage basin were cal-culated by dividing the number of cells of a given category bythe total number of cells in a drainage basin multiplied by 100to yield the percent land-use. The land-use proportions wereappended to the environmental characteristic data set (appendix1, back of report).

Summary

The U.S. Environmental Protection Agency (USEPA) hasdeveloped nutrient criteria using ecoregions to manage and pro-tect rivers and streams in the United States. Individual statesand tribes are encouraged by the U.S. Environmental ProtectionAgency to modify or improve upon the ecoregion approach.The Oklahoma Water Resources Board (OWRB) has developeda dichotomous process that stratifies or groups streams based onenvironmental characteristics such as stream order and streamslope; this process is commonly known as the Use SupportAssessment Protocols, subchapter 15 (USAP). The OWRB isusing nutrient and environmental characteristic thresholdsdeveloped from a study conducted in the Netherlands. The U.S.Geological Survey, in cooperation with the OWRB, is provid-ing descriptive statistics of water-quality sampling sites that canbe used to modify the USAP to reflect hydrological and ecolog-ical conditions relevant to Oklahoma streams and rivers. Fourenvironmental characteristics -- drainage-basin area, stream

slope, stream order, and land-use proportions -- that affect nutri-ent concentrations in Oklahoma streams were compiled using aGeographic Information System and are provided in appendix 1(back of report).

Data sets of flow-direction and flow-accumulation (alsoreferred to as hydrologic derivatives) were used to define drain-age basins for 798 water-quality sites in Oklahoma. The ARC/INFO GRID module was used to create drainage basins andcompute corresponding areas. Individual water-quality siteswere used to define a pour point (an outlet for a drainage area)from which a complete or partial drainage basin was created.An automated process was developed that iteratively selected awater-quality site, converted it into a pour point, snapped thepour point to cells of high flow-accumulation, and delineated adrainage basin for that site. Over 400 drainage basins extendedbeyond the coverage of the flow-accumulation and flow-direc-tion data sets developed by Cederstrand and Rea (1995). TheARC/VIEW GEOPROCESSING extension was used to appenddrainage partially defined drainage areas to the most detaileddigital hydrologic unit maps available for those areas.

Stream order was calculated using methods developed byStrahler (1952) and a stream data set created from a hydrologicderivative (flow accumulation) of the U.S. Geological SurveyNational Elevation Dataset (NED). The stream data set derivedfrom the flow accumulation dataset modeled streams in Okla-homa at a consistent stream density. A program was used toassign stream order values for streams in the synthetic hydrog-raphy data. The beginning or headwater streams are designatedas a first-order stream. A second-order stream is formed whentwo first-order streams intersect; when two second-orderstreams intersect, a third-order stream is formed; and so forth.

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Selected References 11

The immediate stream-channel slope for each of the 798water-quality sites was calculated using flow-accumulation andDigital Elevation Model data sets. A vector linear network thatrepresented streams in Oklahoma at a consistent density wascreated from the flow-accumulation data set. A point data setwas made from each beginning and ending node in the streamdata set. A unique identification code was used that linked thepoint data set to the stream data set. The point data set was usedto overlay the DEM and extract elevation information for eachpoint. Elevations for each point were transferred to the nodes inthe stream data set using unique identification codes. A simplecalculation using the change in elevation between nodes,divided by the distance between nodes, was performed to calcu-late the immediate stream-channel slope for stream segmentsnear water-quality sites.

Land-use proportions were computed for each of the 798drainage-basin areas using the ARC/INFO GRID module andland-use information from the National Land Cover Dataset(NLCD). The NLCD is based on 30-meter Landsat ThematicMapper (TM) data acquired by the Multi-Resolution LandCharacterization (MRLC) Consortium. The base data set for theNLCD project was compiled using leaves-off Landsat TM data,nominal-1992 acquisitions and other ancillary leaves-on Land-sat TM data. The NLCD data set consists of twenty-one land-use categories. These land-use categories were aggregated toproduce a land-use data set that consisted of 11 land-use cate-gories. A land-use data set was compiled for the Arkansas-White-Red River basin. Drainage-basin boundaries were usedto select only the land-use information inside the drainagebasins. Land-use proportions within each drainage basin werecalculated by dividing the number of cells of given category bythe total number of cells in a drainage basin multiplied by 100.

Selected References

Brown, J.R., Ulery, R.L., and Parcher, J.W., 2000, Creating aStandardized Watersheds Database for the Lower RioGrande/Rio Bravo, Texas: U.S. Geological Survey Open-File Report 00-065, 17 p.

Cederstrand, J.T. and Rea, Alan, 1995, Watershed boundariesand digital elevation model of Oklahoma derived from1:100,000-scale digital topographic maps: U.S. GeologicalSurvey Water-Resources Investigations Report 95-727,CDROM.

Elevation Derivatives for National Applications, (EDNA),2001, Elevation Derivatives for National ApplicationsHomepage: accessed August 7, 2001 at URLhttp://edcnts12.cr.usgs.gov/ned-h

Environmental Systems Research Institute, Inc. (ESRI), 2001a,GRID Command References, ARC/INFO Version 8.1 Arc-Doc: Redlands, CA. [Online documentation]

——, 2001b, ARC/VIEW Version 3.2: Redlands, CA. [Onlinedocumentation]

Hutchinson, M.F., 1989, A new procedure for gridding eleva-tions and stream data with automatic removal of spuriouspits: Journal of Hydrology, v. 106, p. 211-232.

Jenson, S.K., and Domingue, J.O., 1988, Extracting Topo-graphic Structure from Digital Elevation

Data for Geographic Information System Analysis: Photogram-metric Engineering and Remote Sensing, v. 54, n. 11, p.1593-1600.

Kansas Data Access and Support Center, 2000, State of KansasGeographic Information Systems Initiative's Data Accessand Support Center: accessed March 20, 2000, at URLhttp://gisdasc.kgs.ukans.edu/

Langbein, W.B., and Iseri, K.T., 1973, General introduction andhydrologic definitions: U.S. Geological Survey Water-Supply Paper 1541-A, 29 p.

Munn, M.D., Black, R.W., Haggland, A.L., Hummling, M.A.,and Huffman, R.L., 1998, An

Assessment of stream habitat and nutrients in the Elwha RiverBasin: Implications for restoration: U.S. Geological SurveyWater-Resources Investigations Report 98-4223, 38 p.

National Elevation Dataset (NED), 2001, National ElevationDataset Homepage: accessed November 14, 2001, at URLhttp://gisdata.usgs.gov/ned

National Hydrography Dataset (NHD), 2001, National Hydrog-raphy Dataset Homepage: accessed July 24, 2001, at URLhttp://nhd.usgs.gov/

National Land Cover Dataset (NLCD), 2000, Land Cover Char-acterization Program: accessed August 1, 2001, at URLhttp://landcover.usgs.gov/

Oklahoma Water Resources Board (OWRB), 2001, Oklahoma'sWater Quality Standards Subchapter 15, Use SupportAssessment Protocols: Title 785, chapter 46, subchapter 15

Peters, E.T.H., and Gardeniers, J.J.P., 1998. Ecologically basedstandards for nutrients in streams and ditches in the Nether-lands: Water Science Technology 17(3): p. 277-234

Robertson, D.M., Saad, D.A., and Wieben, A.M., 2001, Analternative rationalization scheme for defining nutrient crite-ria for rivers and streams: U.S. Geological Survey Water-Resources Investigations Report 01-4073, 57 p.

Seaber, D.R., Kapinos, E.P., and Knapp, G.L., 1984, Statehydrologic unit maps: U.S. Geological Survey Open-FileReport 84-708, 198 p.

Strahler, A. N., 1952, Hypsometric (areal-altitude) analysis oferosional topography: Bulletin Geological Society of Amer-ica, v. 63, p. 1117-1142.

——, 1957, Quantitative analysis of watershed geomorphol-ogy, Transactions-American Geophysical Union, v. 8, p.913-920

Tortorelli, R.L., 1997, Techniques for estimating peak-stream-flow frequency for unregulated streams and streams regu-lated by small floodwater retarding structures in Oklahoma:U.S. Geological Survey Water-Resources InvestigationsReport 97-4202, p.39

U.S. Environmental Protection Agency, 2001, Storage andRetrieval (STORET) data system, 2001, U.S. EPA Storage

Page 18: Environmental Characteristics and Geographic ...

12 Environmental Characteristics and Geographic Information System Applications for the Development of Nutrient Thresholdsin Oklahoma Streams

and Retrieval data system: accessed May 4, 2001, at URLhttp://www.epa.gov/storet/

U.S. Geological Survey, 2000, National Land Cover Dataset:U.S. Geological Survey Fact Sheet 108-01, p. 3

Page 19: Environmental Characteristics and Geographic ...

Appendix

Page 20: Environmental Characteristics and Geographic ...

14 Environmental Characteristics and Geographic Information System Applications for the Development of Nutrient Thresholdsin Oklahoma Streams

Page 21: Environmental Characteristics and Geographic ...

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Page 25: Environmental Characteristics and Geographic ...

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Page 26: Environmental Characteristics and Geographic ...

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Page 27: Environmental Characteristics and Geographic ...

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Page 28: Environmental Characteristics and Geographic ...

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Page 29: Environmental Characteristics and Geographic ...

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Page 30: Environmental Characteristics and Geographic ...

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Page 35: Environmental Characteristics and Geographic ...

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Page 36: Environmental Characteristics and Geographic ...

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Page 37: Environmental Characteristics and Geographic ...

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Page 39: Environmental Characteristics and Geographic ...

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Page 40: Environmental Characteristics and Geographic ...

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Page 41: Environmental Characteristics and Geographic ...

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Appe

ndix

1. E

nviro

nmen

tal c

hara

cter

istic

s fo

r eac

h of

the

798

wat

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ualit

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in O

klah

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[dm

s,de

gree

sm

inut

esse

cond

s;m

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are

mile

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per

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erce

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ow; n

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ashi

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itude

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land

s

Page 42: Environmental Characteristics and Geographic ...

Cat

fish

Ck

Sect

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25/3

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Appe

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1. E

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h of

the

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land

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Page 43: Environmental Characteristics and Geographic ...

Mill

Ck

nr. H

arde

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ity34

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Appe

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1. E

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tal c

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Page 44: Environmental Characteristics and Geographic ...

Spri

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Page 48: Environmental Characteristics and Geographic ...

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Appe

ndix

1. E

nviro

nmen

tal c

hara

cter

istic

s fo

r eac

h of

the

798

wat

er-q

ualit

y si

tes

in O

klah

oma—

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inue

d

[dm

s,de

gree

sm

inut

esse

cond

s;m

i2 ,squ

are

mile

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per

mile

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erce

nt;D

ev.l

and,

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elop

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nds;

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ins;

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k,C

reek

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iver

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bove

; blw

, Bel

ow; n

r., N

ear;

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h., W

ashi

ngto

n; H

wy,

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hway

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land

s

Page 49: Environmental Characteristics and Geographic ...

Whi

skey

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nviro

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tal c

hara

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r eac

h of

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tes

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ow; n

r., N

ear;

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h., W

ashi

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wy,

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land

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Page 50: Environmental Characteristics and Geographic ...

Sout

h C

anad

ian

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ro -

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ndix

1. E

nviro

nmen

tal c

hara

cter

istic

s fo

r eac

h of

the

798

wat

er-q

ualit

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tes

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klah

oma—

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gree

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esse

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ow; n

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Page 51: Environmental Characteristics and Geographic ...

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Appe

ndix

1. E

nviro

nmen

tal c

hara

cter

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s fo

r eac

h of

the

798

wat

er-q

ualit

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tes

in O

klah

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d

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s,de

gree

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inut

esse

cond

s;m

i2 ,squ

are

mile

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per

mile

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erce

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nds;

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ins;

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k,C

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iver

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bove

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ow; n

r., N

ear;

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h., W

ashi

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wy,

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hway

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Page 52: Environmental Characteristics and Geographic ...

Lak

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, Bel

ow; n

r., N

ear;

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h., W

ashi

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wy,

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hway

]

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iden

tific

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nnu

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rLa

titud

e(d

ms)

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itude

(dm

s)

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n ch

arac

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tics

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-use

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Page 53: Environmental Characteristics and Geographic ...

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