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Kerber Creek Restoration Project. Case study employing statistical techniques to analyze effects of restoration activities, Saguache, CO. - PowerPoint PPT Presentation

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By: Trevor Klein (OSM/VISTA, Kerber Creek Restoration Project); Laura Archuleta (Environmental Contaminants Specialist, U.S. Fish & Wildlife Service), Jason Willis (Mine Restoration Field Coordinator, Trout Unlimited), Negussie Tedela, Ph.D. (Hydrologist, Bureau of Land Management), Brian Sanchez, Ph.D. (Environmental Contaminants Specialist, U.S. Fish & Wildlife Service)Case study employing statistical techniques to analyze effects of restoration activities, Saguache, COKerber Creek Restoration Project

Introduction: Site History & Study Objectives

Methods: Site Description & Study Design

Results: Presentation of Data

Discussion: Results & Study Errors

Conclusions

Presentation Overview2Site Location

Northernmost end of Saguache County, CO in the northern San Luis Valley

Tributary to San Luis Creek in the Rio Grande Closed Basin

Kerber Creek watershed is approximately 260 km2

Includes private and BLM-owned rangeland and Rio Grande National Forest

31880s 1970s (largely ceased by 1930s)Dozens of silver, lead, zinc, copper mines (largest: Rawley 12)Tailings originally collected and consolidated in streams and behind damsDams destroyed by flood events that carried tailings downstream and deposited them along the stream bank (mid-20th century)

Bonanza Mining District: A History

Restoration Efforts, I1991: USFS & CDPHE investigate for Superfund designation1994: Bonanza Group (ASARCO, Inc., USFS, BLM, Local Landowners) approved to pursue Voluntary Cleanup

1994-1999: Restoration projects implemented (upper watershed)2002: ASARCO, Inc. declares bankruptcy, halting restoration projects

Rawley 12, pre-1996

Rawley 12, 2012

Squirrel Creek, pre-1992

Squirrel Creek, 2012Restoration Efforts, IIKerber Creek Restoration ProjectMission: To sustain the health of the Kerber Creek watershed through collaborative restoration projects and community education

MethodsPhytostabilization: In-situ treatment of mine waste deposits

Stream Bank Stabilization: Installation of in-stream rock structures, re-gradation of stream banks

Restoration Project ObjectivesImprove water quality

Increase vegetation cover

Increase fish density

Increase macroinvertebrate density

Reduce width/depth ratio

Increase sinuosityCase Study: Problem and ObjectivesProblemObjectivesSystematic, rigorous data analyses rarely conducted for restoration projects

Needs Comprehensive understanding of project results using easily monitored/derived variablesFurther knowledge of stream restoration processesEvaluate effects of extent of phytostabilization & time on sinuosity

Identify functional relationship between extent of phytostabilization & sinuosity

Assess validity & feasibility of statistical techniques employed7

Introduction: Site History & Study Objectives

Methods: Site Description & Study Design

Results: Presentation of Data

Discussion: Results & Study Errors

Conclusions

Presentation Overview8Geology: Dominated by tertiary igneous rock (latite)

Precipitation: Low elevation, 25.4 cm; High elevation, 76.2 cm

EcologyVegetation: grasses, willows, sedgesFishery: brook trout, some brown trout & longnose dace

HydrologyAvg. high flow: 60 cfsAvg. base flow: 4 cfs100-yr flood: 464 cfs

GeomorphologyAvg. bankfull width: 4.3 4.9 mAvg. bankfull depth: < 0.3 mAvg. gradient: 3%Medium-to-large cobble substrateSite Description

Measuring Variables, I: Sinuosity

Measuring Variables, II: Extent of Phytostabilization

Used to investigate Objective 1

Repeated measures analysis of varianceTime: Effect of natural channel evolutionIndependent Variable: Phytostabilization index treatment levels

Interaction Term: Time BY Phytostabilization indexDependent Variable: Sinuosity

Statistical Analysis, I: ANOVA

12Statistical Analysis, II: Linear RegressionNote differences in graphs of Cooks D statistic vs. observation, studentized residual vs. leverage, sinuosity vs. predicted value, and measures of normalityRegression Diagnostics With and Without Outlier

Introduction: Site History & Study Objectives

Methods: Site Description & Study Design

Results: Presentation of Data

Discussion: Results & Study Errors

Conclusions

Presentation Overview15Results, I: ANOVANo statistically significant differences; all null hypotheses could not be rejected

Regression coefficient not significant

Adjusted correlation coefficient = 0.357

No final regression model

Results, II: Linear Regression

Phytostabilization Index (unitless)Sinuosity (unitless)

Introduction: Site History & Study Objectives

Methods: Site Description & Study Design

Results: Presentation of Data

Discussion: Results & Study Errors

Conclusions

Presentation Overview18Discussion, I: ANOVA19Discussion, II: Linear Regression20Discussion, III: Validity & Feasibility of the Study21Variable time periods since completion of restoration at each site

Remote sensing-induced errors at KC08Discussion, IV: Other Considerations

Introduction: Site History & Study Objectives

Methods: Site Description & Study Design

Results: Presentation of Data

Discussion: Results & Study Errors

Conclusions

Presentation Overview23Findings generally inconclusiveFurther, more rigorous data collection requiredNeed to develop more accurate, quantitative measures of extent of restorationNeed to identify appropriate statistical techniquesConclusions

Squirrel Creek, 1990s

Squirrel Creek, 2013

Thanks!Trevor Klein, OSM/VISTA CoordinatorE-mail: trevorik276@gmail.comPhone: 757-286-2579

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