wetland analysis - nera final analsyis...wetland analysis - nera final analsyis analysis input...

Wetland Analysis - NERA Final Analsyis Analysis Input LayersT & E Wetland Species, 303d Impaired Waters, Wetlands - NWI AcresSurface Water Flow Decline, Wetland Trend, Noxious Weeds, Ground Water Decline,and Wetland Complexes

Noxious Weeds Infestation Estimates - Purple LoosestrifeBase Data

% of HUC ContainingPurple Loosestrife

0.001094 - 2.6034502.603451 - 11.98465511.984656 - 19.98468819.984689 - 51.876978

AnalysisWeight

40506070

8. Noxious Weeds Estimates - Purple Loosestrife County Noxious Weed Data: Data collected by the The Nebraska Department of Agriculture from county weed superintendents. These are the local agencies responsible for enforcing the Nebraska Noxious Weed Act. NDA requests this information annually MEDIUM Ranking

MEDIUM Weight

WetlandsBase LayerComponent

Nebraska ResourceAssessment Wetland/Deep Water Habitat Trend

Resource Component

Modified wetlands includewetlands that have beenpartially drained or ditched,diked or impounded orexcavated.

Source: US Fish & Wildlife Service National Wetlands Inventory 1981 - Present.Map Date: February 2005

6. Wetland/Deep Water Habitat Trend. NERA 2 uses National Wetlands Inventory (NWI) based on data from 1981 to present developed by US Fish & Wildlife Service. MEDIUM Ranking - based on percent of total wetlands that have been modified.

% of Total WetlandsModified.01 - 25.00 %25.01 - 50.00 %50.01 - 75.00 %75.01 - 100 %

Interpretation LegendAnalysisWeight

40506070

"5.

MEDIUM Weight

7. Ground Water Trend - Decline, Spring 1999 - Spring 2004 Data based on USGS ground water change maps from spring to spring of the following years: 1999 - 2000, 2002 - 2003 and 2003 - 2004. Categories are based on Jenks Natural Breaks Divisions within the data. The base maps that went into the final map were created based on the percent of each HUC that contained a range of decline. There were three ranges of decline: -0.01 to -1.99 ft, -2.00 to -5.00 ft and > -5.00 ft. Each category was then given a point from 1 to 3, lowest decline to the highest decline. The total points for each year's worth of data were then added together to create the trend map as shown above. Weight NERA2: LOW Ranking.

Total Points/HUC3 Categores

Annual Ground Water Decline Years 99-00, 02-03, 03-04Base Data

AnalysisWeight

Nebraska ResourceAssessment

WetlandsBase LayerComponent

0 - 23 - 89 - 1213 - 18

16202428

LOW Weight

WetlandsPercent of HUC Containing Wetlands

Source: US Fish & Wildlife Service National Wetlands Inventory 1981 - Present.Map Date: February 2005

WetlandsBase LayerComponent

Nebraska ResourceAssessment

3. Wetlands NERA 2 uses US Fish & Wildlife Service National Wetlands Inventory (NWI) data. Based totally upon the percent of the HUC containing wetland acres. MEDIUM ranking.

% of HUC Containing Wetlands

Interpretation LegendAnalysisWeight

40506070

0.000000 - 1.1117021.250081 - 2.4087712.625567 - 4.7899845.536973 - 9.491154

MEDIUM Weight

1. Surface Water Quality NERA 2 uses the 2004 Nebraska Department of Environmental Quality Section 303d Impaired Stream or Lake List.The map is the compulation of the following three data sets: Population by HUC Number of CAFO's by HUC Number of Impairments by Stream SegmentThe above three data sets were all given points based on the total number of occurances (See accompanying maps). The points per HUC were then summed to obtain the finalanalysis by HUC. This map reflects that sum total of points. The weights given will be the weights used in the NERA 2 analysis for Surfact Water Quality.

Surface Water Quality - Section 303d List WetlandsBase LayerComponent

Nebraska Resource Assessment

Final HU Ranking80100120140

AnalysisWeight

221 - 280

80 - 100100 - 160160 - 220

HIGH Weight

LOW WeightSurface Water Flow Decline

4. Surface Water Flow Decline NERA 2 used annual percent change in flow calculations from DNR.

Nebraska Resource Assessment WetlandsBase LayerComponent

AnalysisWeight

20

HU Ranking

DeclineNo Decline

LOW WeightWetland Complexes

8. NERA 2 used the different Wetland complexes identified by Nebraska Game & Parks Commission with different relative importance "Scores". The scores were summed and the HU's were ranked according to the total points. Weight: LOW Ranking

Nebraska Resource Assessment WetlandsBase LayerComponent

AnalysisWeight

HU Ranking

16202428

12 - 34 - 56 - 8

T & E and At Risk Wetland Dependent SpeciesHIGH Weight

1. T & E and At Risk Species NERA 2 used Nebraska Game & Parks data on T & E species as well as the Natural Heritage Legacy Project that identifies At Risk species. The number per HU was identified and summed and given a weight.

Nebraska Resource Assessment WetlandsBase LayerComponent

AnalysisWeight

80100120140

HU Ranking0 - 23 - 56 - 89 - 13

Map Date: June 2005USDA NRCS Nebraska

Description of Interpretation:Input layers 1- 8 weighted values for wetlands were totaledto give a final HU ranking. Rankings were classified into 4classes using Natural Breaks. The higher the ranking, thehigher the concern for Wetlands.

Wetlands AnalysisFinal HU Ranking

Low Concern

High Concern

Map is not appropriate forlocalized interpretation.

This map is to be used for areato area (hydro unit to hydro

unit) comparisons only.