William W. Walker, Jr., Ph.D.Environmental Engineer, Concord, Massachusetts| Home Page | Resume´ | E-Mail |Project SummariesDOCTORAL THESIS RESEARCH (1973-1976) Harvard University, Division of Engineering & Applied Physics. Thesis. Lake Modeling and Statistics; Parameter Estimation in Nonlinear Dynamic Systems; Case Study of Onondaga Lake, NY; Compilation and Analysis of Water Quality Data Base and Development of Vertical Stratification Model; Error and Sensitivity Analysis Techniques Applied to Empirical Lake Eutrophication Models. CHARLES RIVER COMBINED SEWER OVERFLOW STUDY (1971-1972) Process Research, Inc. & Metropolitan District Commission, Massachusetts Field Inspection, Mapping, and Modeling Storm & Combined Sewer Systems in Boston Metropolitan Area. HARDY POND EUTROPHICATION STUDY (1972-1974) Process Research, Inc. & City of Waltham, Massachusetts Lake & Watershed Assessment; Aquatic Weed Harvesting. ALGAL BIOPOLYMERS AS SOIL AMENDMENTS (1973-1975) Process Research, Inc. & American Bioculture, Inc. Research & Development of Algal Mass Culturing Techniques; Agricultural Field Experiments in Arizona and California to Evaluate Effects of Algal-Derived Polymers on Soil Structure and Crop Yield LOWER CHARLES RIVER BASIN STUDY (1973-1975) Process Research, Inc. & Metropolitan District Commission, Massachusetts Development of Model for Algae (Multi-Species), Coliforms, and Transparency, as Influenced by Combined Sewer Overflows, Urban Runoff, and Inflows from Upper Charles; Effects of Salinity and Light on Algal Species Transition and Coliform Dieoff; Evaluation of Water Quality Management Alternatives, Including Combined Sewer Flushing and Physical/Chemical Treatment of Upstream Inflows to Remove Turbidity, Color, and Phosphorus. IMPACTS OF PL 92-500 ON THE CHARLES RIVER BASIN (1974-1975) Process Research, Inc. & National Commission on Water Quality Assessment Impacts of Water Pollution Control Legislation on Water Quality; Data Review; Model Implementation. POTOMAC ESTUARY WASTELOAD ALLOCATION STUDY (1975) Process Research, Inc. & Washington Suburban Sanitary Commission Review of Water Quality Data and Proposed Wasteload Allocations; Evaluation of Point-Source vs. Non-Point Source Impacts. CROSS-FLORIDA BARGE CANAL ENVIRONMENTAL IMPACT STUDY (1975) Meta Systems, Inc. & U.S. Army Corps of Eng., Jacksonville, Florida Estimation of Nutrient Balances and Related Water Quality Impacts of Alternative Alignments for Proposed Canal Across Northern Florida. ONONDAGA LAKE CASE STUDY (1976) National Academy of Science, Study Group on Environmental Monitoring Preparation of Case Study Demonstrating Uses of Lake Water Quality Monitoring Data in Defining and Solving Problems. ENVIRONMENTAL IMPACTS OF SHERCO COAL-FIRED POWER PLANT (1977) Environmental Research and Technology, Inc. & State of Minnesota Assessment of Impacts on Mississippi River Water Quality. BOSTON CASE STUDY (1977) Environmental Research & Technology, Inc. & Council on Environmental Quality, Washington Urban Runoff Modeling; Evaluation of Storage/Treatment & Street Sweeping as Control Measures for Urban Nonpoint Source Pollution. LOW-FLOW AUGMENTATION FOR WATER QUALITY CONTROL (1978) Meta Systems, Inc. & U.S. Environmental Protection Agency Development of Screening Procedures & Models for Evaluating Water Quality Benefits of Low-Flow Augmentation. ONONDAGA LAKE DATA BASE (1978) Stearns and Wheler, Inc., Cazenovia, New York Water Quality Data Base & Computer Support; Assessment of Vertical Transport in Saline Lake. WATER QUALITY IMPACTS OF AGRICULTURAL PRACTICES (1978-1979) Meta Systems, Inc. & U.S. Environmental Protection Agency Development of Models for Soil Erosion, Sediment & Nutrient Transport, and Lake Responses to Soil & Water Conservation Practices Applied to Midwestern Agricultural Watersheds. WATER QUALITY IMPACTS OF NEW RESIDENTIAL DEVELOPMENT (1978-1979) Meta Systems, Inc. & U.S. Environmental Protection Agency Urban Stormwater Runoff Data Analysis & Development of Simulation Model For Evaluating Control Alternatives. FATE AND IMPACTS OF COLOR IN RECEIVING WATERS (1979-1980) Environmental Research and Tech., Inc. & Pulp & Paper Client Literature Review; Development of Models and Screening Procedures for Ranking Mills with Respect to Color Impact. WATER QUALITY MONITORING FOR PULP & PAPER INDUSTRY (1979-1980) Environmental Research and Tech., Inc. & Pulp & Paper Client Survey Design; Data Analysis and Interpretation; Stream Modeling; Several Locations Nationwide. WEST RIVER WATERSHED WATER SUPPLY STUDY (1978-1982) Meta Systems, Inc. & New Haven Water Company, Connecticut Assessment of Land Use/Reservoir Water Quality Relationships; Design of Monitoring Programs and Data Analysis; Development of Models for Relating Land Uses to Eutrophication and Related Water Quality Conditions. LAKE QUINSIGAMOND NATIONWIDE URBAN RUNOFF / 314 STUDY (1979-1982) Meta Systems, Inc. & MA Dept. of Env. Quality Engineering Assessment of Lake Water Quality as Influenced by Urban Nonpoint Sources; Development of Multiple-Segment Lake Model; Assessment of Fishery Habitat as Influenced by Eutrophication (Hypolimnetic Oxygen Depletion) and Thermal Stratification; Evaluation of Lake Restoration Alternatives. LOWER WINOOSKI RIVER WASTELOAD ALLOCATION STUDY (1979-1982) Meta Systems, Inc., USEPA Water Planning Division, VT Agency of Environmental Cons. & GKY Assoc. Analysis of Historical Water Quality Data from Complex Vermont River System Influenced by Several Point Sources and Hydropower Dams; Design of Monitoring Programs to Support Model Implementation; Refinements to USEPA's QUAL-2 Model to Improve Nutrient Cycles and Algal Kinetics; Development of SAS Interface; Assistance in Model Applications for Wasteload Allocation. Publication 1984. IMPACTS OF WACHUSETT MOUNTAIN SKI AREA EXPANSION (1979-1980) Meta Systems, Inc. & Massachusetts Department of Environmental Management Runoff & Erosion Modeling; Evaluation of Control Alternatives; Water Supply Impact Assessment. EMPIRICAL METHODS FOR PREDICTING EUTROPHICATION IN IMPOUNDMENTS (1978- Waterways Experiment Station, U.S. Army Corps of Engineers, Vicksburg, Mississippi Development of Simplified Techniques for Predicting Eutrophication Potential in Reservoirs; Compilation of a Nationwide Data Base on 300 Corps Reservoirs, Including Data on Water Quality, Hydrology, Morphometry, and Watersheds; Testing of Empirical Nutrient Loading Models Previously Developed for Northern Lakes; Refinement of Models to Improve Performance and Utility in Reservoirs; Development of Interactive Mainframe and Microcomputer Computer Programs to Assist in Data Reduction and Model Implementation; Development of Nationwide Data Base on Contaminants in Corps Reservoirs and Interface with USEPA's STORET System; Preparation of 5 Published Research Reports, 14 Working Papers, and 9 Symposia Presentations; Presentation of 2 Courses / Computer Workshops; Several Revisions of Software & Documentation. Research Reports and Software . EUTROPHICATION ANALYSIS PROCEDURE FOR VERMONT LAKES (1981-1983) Vermont Agency of Environmental Conservation, Dept. of Water Resources & Environmental Engineering Development of Model for Predicting Lake Water Quality from Watershed Land Uses, Soil Types, and Lake Morphometry Using Probabilistic Techniques; Analysis of Statewide Lake Water Quality Data Base. Publication 1982. LAKE MOREY 314 DIAGNOSTIC STUDY (1979-1983) Vermont Department of Water Resources & USEPA Design of Monitoring Program; Analysis of Lake and Watershed Data; Development of Predictive Model for Evaluating Control Options for Eutrophic Lake with High Internal Phosphorus Recycling Rates. COLUMBIA RESERVOIR / DUCK RIVER STUDY (1980-1981) Environmental Defense Fund Testimony Before Tennessee Water Quality Control Board on Water Quality Impacts of Proposed TVA Reservoir. PHOSPHORUS/CHLOROPHYLL RELATIONSHIPS IN U.S. LAKES & RESERVOIRS (1980) Tetra Tech, Inc. & U.S. Environmental Protection Agency Attended Workshop and Reviewed Client's Report on Nationwide Effectiveness of Point and Nonpoint Phosphorus Loading Reductions for Controlling Lake and Reservoir Eutrophication. EUTROPHICATION CONTROL STRATEGIES FOR THE POTOMAC ESTUARY (1981) Environmental Defense Fund Reviewed Reports on Data Analysis and Modeling of Water Quality and Management Alternatives. SEBASTICOOK RIVER WASTELOAD ALLOCATION (1982) Kleinschmidt and Dutting, Inc., Pittsfield, Maine Reviewed Proposed Wasteload Allocation; Recommended Monitoring Program; Applied QUAL-2 Stream Water Quality Model to Small Stream Influenced by Combined Municipal/Industrial Discharge. WATER QUALITY IMPACTS OF VERMONT HYDROPOWER PROJECTS (1982) Vermont Department of Water Resources & Environmental Engineering Development of Screening Procedures and Models for Identifying Water Quality Problems Associated with Existing and Proposed Hydropower Projects in Vermont. SUDBURY/CONCORD RIVER WATER SUPPLY DIVERSION STUDY (1982-1984) IEP, Inc. & Metropolitan District Commission, Massachusetts Assessment of Downstream Water Quality Impacts of Proposed Diversion; Analysis and Interpretation of Hydrologic and Water Quality Monitoring Data; Application of Modified QUAL-2 Program to Evaluate Impacts on Dissolved Oxygen, Nutrients, Algae, and Coliforms; Modifications of Model to Account for Interactions with Adjacent Wetlands; Development of Interface to Permit Use of HEC-II Hydraulic Output in QUAL-2. ENGINEERING MANUAL ON RESERVOIR WATER QUALITY (1983) FTN & Associates & U.S. Army Corps of Engineers Wrote Chapters on Watershed Ecological Systems, Statistics, and Reservoir Eutrophication Modeling. LAS VEGAS BAY / LAKE MEAD NUTRIENT LOAD ALLOCATION STUDY (1983) Environ Corporation & City of Las Vegas, Nevada Reviewed Data and Modeling Reports in Support of Testimony by Client on Issues Related to Eutrophication and Turbidity. ORGANIC CONTAMINANTS IN NIAGARA FALLS WATER SUPPLY (1983-1985 ) Cambridge Analytical Associates, Inc. & USEPA Region II Developed and Summarized Computer Data Base on Historical Water Quality, as Part of Investigation of Water Supply Contamination. PHOSPHORUS STANDARD FOR CHERRY CREEK RESERVOIR (1984, 2000) Greenwood Village, Colorado Prepared Report and Testified before Colorado Water Quality Control Board on Management of Reservoir Water Quality Via Regulation of Phosphorus; Developed and Applied Methods for Relating Mean Nutrient and Chlorophyll-a Levels to Bloom or Nuisance-Level Frequencies (1984); Testified Regarding Proposed Revision of Phosphorus Standard (2000). QUAL-2 RIVER MODEL ENHANCEMENTS (1984) National Council for Air and Stream Improvement, Medford, Massachusetts Developed Recommendations for Updating of QUAL-2 Model With Respect to Algal Kinetics and Nutrient Cycles. Workshop 1983. OCCOQUAN RESERVOIR STUDY (1984) Environ Corporation, Washington, D.C. Supported Testimony by Client Regarding Impacts of Watershed Development on Reservoir Eutrophication and Water-Supply Trihalomethanes; Compiled and Analyzed Nationwide Data Base Relating Reservoir Eutrophication Indices to Finished-Water Trihalomethane Levels. RATES, CONSTANTS, & KINETICS IN SURFACE WATER MODELING (1977, 1984) Tetra Tech., Inc. & USEPA, Athens Laboratory, Georgia Development of Manuals on Surface Water Modeling Techniques; Reviewed Client's Drafts Report and Attended Two Workshops. LAKE CHAMPLAIN FISH HATCHERY IMPACT STUDY (1984-1989) Vermont Department of Fish and Wildlife; Vermont Department of State Buildings; in conjunction with J.P. Laible, Department of Civil Engineering, University of Vermont, & S.W. Effler, Upstate Freshwater Institute, New York Development of Two-Dimensional Transport Model for Evaluating Near-Field Impacts of Proposed Hatchery Discharge on Eutrophication and Related Water Quality Conditions; Design of Field Studies to Support Model Implementation; Development of Software for Display and Reduction of 2-D Water Quality Data; Evaluation of Alternative Effluent Limitations and Outfall Locations; Compilation and Analysis of Eutrophication-Related Water Quality Data from Throughout Lake Champlain; Assessment of Relationships Between Nutrient Levels and Nuisance Algal Growths in Various Lake Segments; Testimony at Public Hearings. MANASQUAN RIVER AND WATER-SUPPLY RESERVOIR STUDY (1985) Environ Corporation & New Jersey Water Supply Authority Reviewed Reports on Modeling of River and Proposed Reservoir. IMPACTS OF PHOSPHATE DETERGENT BAN ON CHESAPEAKE BAY (1985) Environ Corporation & Soap and Detergent Association Reviewed Historical Monitoring Data on Eutrophication and Related Water Quality Conditions in Bay and Tributaries; Developed Point-Source Inventory and Mass-Balance Calculations for Alternative Point- and Nonpoint- Source Control Scenarios. THE MILL DEVELOPMENT WATER QUALITY IMPACTS (1985) IEP, Inc., Northboro, Massachusetts Environmental Impact Study for Commercial/Residential Development; Modeled of Impacts on Receiving Water Dissolved Oxygen. RIVERPARK/93 WATER QUALITY IMPACTS (1985-1986) IEP, Inc. & Spaulding and Slye, Inc., Massachusetts Environmental Impact Study for Industrial Park Development; Design of Detention Ponds and Wetlands For Treating Tertiary Effluent and Urban Runoff; Modeling of Receiving Water Impacts. EMERALD SQUARE MALL WATER QUALITY IMPACTS (1985-1987) IEP, Inc.& New England Development and Management, Inc. Environmental Impact Study for Proposed Shopping Mall in Water Supply Watershed; Design of Detention Ponds and Wetland Basins for Runoff Treatment; Design of Monitoring Programs and Data Analysis; Development of Probabilistic Techniques for Evaluating Impacts on Receiving Water Quality, Including Suspended Solids, Nutrients, and Heavy Metals. URBAN DEVELOPMENTS IN ST. PAUL WATER SUPPLY (1983-1987) St. Paul Water Utility, Minnesota Review of Urban Development Plans; Recommendation of Alternatives for Control of Runoff and Related Water Quality Impacts; Development of Regional Criteria for Sizing Detention Ponds to Remove Phosphorus and Other Urban Runoff Pollutants. VADNAIS LAKES DIAGNOSTIC STUDY (1983-1992, 1999-2000) St. Paul Water Utility, Minnesota Design and Implementation of Study for Evaluating Algal-Related Taste-and-Odor Problems; Assessment of Cause-Effect Relationships Linking Watersheds, Pumped Water Supply Sources, Lake Water Quality, Taste-and-Odor, and other Water Treatment Problems; Evaluation of Control Options for Lake Eutrophication, Including Hypolimnetic Aeration, Phosphorus Inactivation, Copper Sulfate, and Watershed Non-Point Source Controls. EBMUD WATER SUPPLY SOURCE EVALUATION (1985-1987) Environ Corp. & East Bay Municipal Utilities District, CA Assessment of Impacts of Alternative Source Diversion Schemes on Reservoir Eutrophication and Water-Supply Trihalomethane Levels. EUTROPHICATION ANALYSIS FOR MASSACHUSETTS LAKES (1986-88) Massachusetts Division of Water Pollution Control Compilation & Analysis of Statewide Data Bases on Watershed Nutrient Export and Lake Eutrophication; Investigation of Factors Associated with Occurrence of Nuisance Aquatic Weed Densities; Development of Models and Computer Software for Use in Lake Diagnostic Studies. SAUK RIVER/HORSESHOE CHAIN OF LAKES STUDY (1986) Minnesota Pollution Control Agency, Division of Water Quality Analysis of Point-Source Phosphorus Loads on Lake Eutrophication and Related Water Quality Conditions. LAMPRICIDE TRANSPORT IN LAKE CHAMPLAIN (1986-1988) New York Department of Environmental Conservation, Division of Fish and Wildlife; in conjunction with J.P. Laible, Department of Civil Engineering, University of Vermont Development of Hydrodynamic and Mass Balance Models to Evaluate the Transport of Lampricides Applied to Several Lake Champlain Tributaries Under a Proposed Lamprey Control Program. REVIEW OF WOONSOCKET INDUSTRIAL HIGHWAY EIS (1986) Town of Lincoln, Rhode Island Reviewed Water Quality and Hydrologic Aspects of Environmental Impact Statement Prepared by Federal and State Highway Agencies. LAKE AND RESERVOIR RESTORATION GUIDANCE MANUAL (1986-1988) North American Lake Management Society & U.S. Environmental Protection Agency Development of Chapter on Techniques for Evaluating Lake or Reservoir Eutrophication Problems. IMPACTS OF WASTEWATER DIVERSION ON ILLINOIS RIVER (1986-87) State of Oklahoma, Attorney General's Office Preparation of Testimony for EPA Hearing Regarding Impacts of a Proposed Wastewater Diversion from Arkansas on Eutrophication and Related Water Quality Conditions in the Illinois River, Oklahoma; Evaluation of Nutrient Transport in Stream and Reservoir Segments of Major River Basin. EVALUATING TRENDS IN CHESAPEAKE BAY WATER QUALITY (1987-88) Soap and Detergent Association, New York Compilation and Analysis of Historical Water Quality Monitoring Data from Chesapeake Bay and its Tributaries; Estimation of Spatial and Temporal Variance Components; Evaluation of Trends in Relation to Implementation of Phosphorus Detergent Bans and Other Source Control Strategies. CHICKAWAUKIE LAKE DIAGNOSTIC STUDY (1987-1988) Cambden and Rockland Water Company & Maine Department of Environmental Protection Analysis of Lake Water Quality Data; Evaluation of Alternative Eutrophication Control Measures. WHITE POND PRELIMINARY DIAGNOSTIC STUDY (1987-1990) Town of Concord, Massachusetts Design and Implementation of Pond Water Quality Monitoring Program; Watershed Reconnaissance; Investigation of Factors Contributing to Nuisance Algal Blooms; Groundwater Hydrologic and Water Quality Studies to Quantify Phosphorus Loads from Shoreline Onsite Sewage Disposal Systems; Development of Pond Restoration/Protection Strategies. LAKE QUINSIGAMOND URBAN RUNOFF CONTROL STRATEGIES (1987-88) Environmental Design and Planning, Inc. & City of Worcester, Massachusetts Investigation of Alternatives for Controlling Pollutant Loadings from an Urban Watershed; Evaluation of Lake Water Quality Conditions and Benefits of Control Measures. ONONDAGA LAKE WATER QUALITY DATA ANALYSIS (1987) Upstate Freshwater Institute, Inc., Syracuse, New York Analysis of Extensive Lake Water Quality Data Base; Evaluation of Spatial, Seasonal, and Longterm Variability in Transparency. EXPERT SYSTEM FOR QUAL-2E MODEL (1987) U.S. Environmental Protection Agency, Environmental Research Laboratory, Athens, Georgia Technical Assistance in Development & Testing of Expert System for Preparation of Input Files for QUAL-2E Stream Water Quality Model; Focus on Inputs Related to Simulation of Nutrients and Algae. HYDRODYNAMICS AND POLLUTANT TRANSPORT IN BURLINGTON BAY (1987) City of Burlington, Vermont & University of Vermont Development and Application of Models for Simulating Pollutant Transport in Burlington Bay, Lake Champlain; Evaluation of Alternative Outfall Locations. WILLSBORO BAY STUDY (1987-88) Willsboro Bay Marina, Inc., New York; with J.P. Laible, University of Vermont Development and Application of Models for Simulating Pollutant Transport in Willsboro Bay, Lake Champlain; Evaluation of Assimilative Capacity for Phosphorus Loadings Associated with Proposed Marina Expansion. BEAVER BROOK STUDY (1988-1989) Anderson-Nichols & Co., Inc., Boston, Massachusetts Evaluation of Proposed Wastewater Discharge Impacts on Nutrients and Eutrophication in a Small Headwater Stream; Application of QUAL-2 Simulation Model. EVALUATING WATERSHED MONITORING PROGRAMS (1988) Dept. of Public Works, City of Baltimore, Maryland Analysis of Historical Monitoring Data from Water Supply Watersheds; Evaluation of Monitoring Program Designs and Development of Statistical Techniques for Detecting Trends in Stream Nutrient Loadings and Reservoir Water Quality Following Implementation of Nonpoint Source Controls. NARRAGANSETT BAY NONPOINT SOURCE STUDY / P8 URBAN CATCHMENT MODEL (1988-1989) Narragansett Bay Project, Rhode Island & IEP, Inc. Massachusetts Development of Models for Quantifying Nonpoint Sources in Narragansett Bay Watersheds; Development of Submodels for Predicting Water Quality Impacts of Buffer Strips and Other Nonpoint Source Control Techniques; Development of Interactive Computer Software ("P8") for Use by Planners and Engineers in Designing Urban BMP's. MAINE WATERSHED MODELING (1988) Maine Department of Environmental Protection, Lakes Program Development of Spreadsheet for Predicting Phosphorus Loads from Maine Watersheds, As Related to Land Use, Soil Type, and Non-Point Source Control Techniques; Development of Spreadsheet for Designing Wet Detention Ponds to Achieve P Load Reductions. ILLINOIS RIVER STUDY (1988-1990) State of Oklahoma, Attorney General's Office Application of QUAL2 Model to Evaluate Impacts of Point and Nonpoint Discharges on Eutrophication and Related Water- Quality Conditions in the Illinois River, Arkansas & Oklahoma; Design of Monitoring Program to Support Modeling Efforts; Development of Recommendations for Controlling Severe Eutrophication Problems in Stream and Reservoir Segments. URBAN RUNOFF CONTROLS FOR ONE TRACER LANE, LEXINGTON, MA (1989) Trustees of Tracer Lane II Realty Trust & IEP Inc. Analysis of Urban Runoff Controls for a Proposed Office Building Adjacent to a Water Supply Reservoir; Modeling of Infiltration and Detention Basis; Projection of Water Quality Impacts. NUTRIENT IMPACTS ON FLORIDA EVERGLADES (1989- U.S. Department of Justice, Environment & Natural Resources Division, Washington, D.C.; U.S. Department of Interior, Everglades National Park Technical Support /Expert Witness in Litigation Regarding Impacts of Nutrient Loadings from South Florida Agricultural Areas on Everglades National Park and Loxahatchee National Wildlife Refuge; Development of Water Quality Standards; Development of Design Criteria for Wetlands Constructed to Remove Phosphorus from Agricultural Runoff. & to Promote Restoration of Natural Hydroperiods; Development of Statistical Procedures for Tracking Progress of Restoration Efforts. LAMBERT CREEK WATERSHED STUDY (1990-1993) Vadnais Lake Area Water Management Organization, Minnesota Diagnostic Study of Nutrient Sources in a Major Tributary to the St. Paul Water Supply Lakes. Watershed Modeling to Quantify Sources and Evaluate Control Measures. PHOSPHORUS IN MASSACHUSETTS WATERS (1990) The Soap & Detergent Association Potential Impacts of a Phosphate Detergent Ban on Water Quality in Massachusetts Rivers and Lakes. (with IEP, Inc.) RANDLEMAN LAKE STUDY (1990) Black & Veatch / Piedmont Triad Regional Water Authority, North Carolina Development of Model for Predicting Eutrophication-Related Water Quality Conditions in a Proposed Water-Supply Reservoir. COMPILATION & REVIEW OF ONONDAGA LAKE DATA BASE (1991- Onondaga County Department of Drainage and Sanitation, New York Compilation, Screening, and Statistical Analysis of 22-year Historical Water Quality Data Base for Eutrophic Lake in Syracuse; Software for Data Screening, Trend Analysis, and Tributary Load Calculations; Lake Advisory Committee; Development of Statistical Framework for Using Long-term Data Sets to Test Hypotheses and Support Future Wastewater Management Decisions. NEW YORK CITY WATERSHED STUDIES (1991) New York City Department of Environmental Protection Reviewed Client's Reports Assessing Impacts of Land Development on Eutrophication and Related Water Quality Conditions in Croton Falls and Muscoot Reservoirs; Advised on Monitoring, Modeling, and Control Measures. WATER QUALITY ASSESSMENT OF LAKE PEPIN, MISSISSIPPI RIVER, MINNESOTA (1991-1995) Minnesota Pollution Control Agency Data Analysis and Model Development for Evaluating Impacts of Alternative Point-Source and Non-Point-Source Controls on Eutrophication and Related Water Quality Conditions in Mississippi River Impoundment. Publication 1995. LAKE YOUNGS STUDY ( 1991-1995) Entranco Engineers, Herrera Environmental Consultants, Seattle Water Department Technical Support in Diagnostic Studies of Oligotrophic Water-Supply Reservoir; Focus on Identification of Taste-and-Odor Precursors and Potential Control Methods; Participation in Technical Workshops; Review of Client Reports. LAKE CHAMPLAIN PHOSPHORUS LOAD ALLOCATION STUDIES (1992-1993) Vermont Department of Environmental Conservation Development of Phosphorus Mass-Balance Model for Use in Allocating Phosphorus Loads to Achieve In-Lake Phosphorus Standards; Review of Procedures for Monitoring and Calculating Tributary P Loads. Modification of BATHTUB Model to Enhance Simulation of Embayments. LAKE OKEECHOBEE EUTROPHICATION STUDIES (1993-1994) South Florida Water Management District Analysis and Modeling of Eutrophication in Lake Okeechobee; Review of Research Reports; Review of Methodology and Data for Calculation of Mass-Balances; Empirical Modeling of Nutrient/Chlorophyll Relationships. Publication 1995 VIABILITY OF ALUM TREATMENTS IN CHINA LAKE & THREEMILE POND, MAINE (1993-1994) Town of China & Maine Department of Environmental Projection Assessment of Alum Treatment for Control of Phosphorus Recycling in Two Lakes; Analysis of Extensive Limnological Data Bases to Assess Magnitudes and Spatial Distributions of Sediment Phosphorus Sources; Development and Application of Mass-Balance Models to Evaluate Alum Doses, Depth Distributions, and Treatment Longevity. WATER QUALITY STANDARDS FOR THE SACRAMENTO-SAN JOAQUIN DELTA ESTUARY (1994-1995) Metropolitan Water District of Southern California Evaluation of Water Quality Standards Proposed by US Environmental Protection Agency for the Sacramento-San Joaquin Delta Estuary, San Francisco Bay; Evaluation of Relationships Among Flow, Salinity, and Bio-Abundance Indicators; Analysis of Fish Population Data. EFFECTIVENESS OF URBAN STORMWATER BMP'S IN FLORIDA (1994) South Florida Water Management District Compilation and Analysis of Large Data Sets Characterizing Water Quality in Discharges from Detention Ponds and Other Urban Stormwater Treatment Devices; Assessment of Exceedence Frequencies in Water Quality Standards as Related to Region, Land use, and Treatment Device Type; Development of Algorithms and Screening Procedures for Tracking Compliance with Surface Water Discharge Permits. CAMBRIDGE WATER DEPARTMENT LIMNOLOGICAL STUDY (1995-1996) Fugro East, Inc. and Cambridge Water Department, Massachusetts Compilation of Historical Hydrologic and Water Quality Data from Urban Watershed; Development of Watershed and Lake Models; Evaluation of Spent Alum Impacts on Storage Reservoir; Evaluation of Water Quality Control Options; Design of Future Monitoring Program. BMP REPLACEMENT WATER RULE FOR EAA (1995-1996) South Florida Water Management District, Everglades Regulation Development of Rainfall-Driven Models for Tracking Changes in Runoff from the ~500,000-Acre EAA Following Implementation of BMP's; Equations for Annual Allocation of Water Deliveries to the Everglades from Lake Okeechobee to Offset Water Losses Due to BMP's; Methods for Seasonal Allocation Designed to Match Timing of Natural (Pre-Developed) Flows Estimated from Hydrologic Simulation Model; Report, Software, and Presentations at Four Public Workshops. AGENCY LAKE EUTROPHICATION MODELING (1994-1995) U.S. Department of Interior, Bureau of Reclamation, Denver Analysis of Hydrologic and Water-Quality Data from Hypereutrophic Lake in the Upper Klamath Basin, Oregon; Development of Water and Nutrient Budgets; Application of BATHUB Model; Assessment of Factors Controlling Internal Nutrient Recycling. FLUX & BATHTUB TRAINING (1995) Minnesota Pollution Control Agency Two-Day Workshop for ~30 Agency Staff and Consultants on Software Developed for Lake Assessments; FLUX Program for Calculating Nutrient Loads Based upon Tributary Monitoring Data; BATHTUB Program for Modeling Lake or Reservoir Eutrophication Response. Software LAPLATTE RIVER / LAKE CHAMPLAIN WATERSHED MODELING STUDY (1995-1997) Charleston University & Vermont Dept. of Environmental Protection Development of Model for Predicting Phosphorus Export Based upon Watershed Land Uses, Topographic/Geologic Features, Climate; Model Interface with GIS Data Base; Calibration and Testing Against Data from Vermont and New York Watersheds Contributing to Lake Champlain; Designed for Evaluating BMP Implementation Strategies to Meet Watershed Load Targets. Documentation Software REVIEW OF TAINTER LAKE MODELING (1995) Wisconsin Department of Natural Resources Review of Eutrophication Model (BATHTUB) Application to Tainter Lake. EVERGLADES REGULATION (1995- South Florida Water Management District, Everglades Regulation Assistance in the Development of Regulations for Implementation of Legislation for Everglades Protection and Restoration; Development of Compliance Tests Based upon Statistical Models Developed from Historical Hydrologic and Water-Quality Monitoring Data; Software for Tracking BMP Performance at Farm & Basin Scales; URBAN DEVELOPMENT IMPACTS IN MARYLAND (1996) Environ Corporation Evaluation of Urban Development Impacts on Nutrient Loads to Downstream Water Bodies; Comparisons of Natural Wetlands and Construct Stormwater Detention Ponds with Respect to Nutrient Removal Efficiency. P8 URBAN CATCHMENT MODEL ENHANCEMENTS (1996- ) Wisconsin Dept of Natural Resources , Minnesota Pollution Control Agency, U.S. Environmental Protection Agency Modifications of Model Developed in 1990 for Simulating Urban Stormwater Runoff Quantity/Quality and Effects of BMP's; Addition of Snowfall/Snowmelt Components; Alternative Storm File Formats; Enhanced Street Sweeping Routines; Calibration of Model to Runoff Water Quality Data from 6 Locations in Wisconsin & Minnesota; Increased Program Capacity; Provided ASCII Input & Output Routines for Watershed Data & Linkage to GIS; Converted to Windows Operating System. Documentation Support Website PLATTE LAKE STUDY (1996- Michigan Department of Natural Resources, Fisheries Division Review of Long-term Water-Quality Monitoring Data from Oligotrophic Lake in Northern Michigan; Evaluation of Fish Hatchery Impacts on Lake Eutrophication; Evaluation of Proposed Lake and Effluent Standards. TECHNIQUES FOR MEASURING WETLAND PHOSPHORUS LOSS COEFFICIENTS (1997-1998) Wetland Management Services & St Johns Water Management District Identification of Existing Data to Support Calibration of P Uptake Models in Florida Wetlands; Design of Field Studies to Support Calibration and Application of Models. PETENWELL RESERVOIR MODELING STUDY (1997-1999) University of Wisconsin, College of Natural Resources, Stevens Point Assistance in the Development of a Eutrophication Model for an Impoundment on the Wisconsin River; Reviewed Client's applications of FLUX and BATHTUB. REVIEW OF BASINS 2.0 (1998) The Cadmus Group, Inc., & U.S. Environmental Protection Agency Reviewed Software Integrating Water Quality Assessments with Geographic Information Systems & Data Bases. Report 1998 CONTAMINANT SOURCES & TRANSPORT IN WACHUSETT RESERVOIR, MASSACUSETTS (1999-2000) U.S. Department of Justice Evaluation of Sources & Transport of Pathogens & Pathogen Indicators in Watershed & Reservoir of Unfiltered Water Supply Serving Metropolitan Boston; Evaluation of Relationships between Land Use & Fecal Coliform Export Using Long-Term Water- Quality Monitoring & GIS Data; Assessment of Potential Transport of Fecal Coliforms, Cryptosporidium, & Giardia through Reservoir. Statistical Analysis of Fecal Coliform Excursions at Water Supply Intake in Relation to Antecedent Storm Events; Review of Watershed Management Efforts; Written Report & Testimony in Federal Court. Report 1999 DEVELOPMENT OF A PHOSPHORUS TMDL FOR LAKE OKEECHOBEE (2000) Florida Department of Environmental Protection & U.S. Department of the Interior Technical Advisory Committee. Development of Restoration Targets. Review of Alternative Modeling Approaches. Development of Coupled Sediment & Water-Column Phosphorus Mass-Balance Model. Publication 1995 Publication 2002 Workshop April 2000 May 3, 2000 May 4, 2000 May 31, 2000 August 1, 2000 Final TMDL Report Dec 2000 TMDL METHODOLOGY FOR LAKES (1999-2001) New England Interstate Water Pollution Control Commission & U.S. Environmental Protection Agency Development & Demonstration of a Framework for Considering Uncertainty & Variability in Phosphorus TMDL's for Lakes. Report 2001 Workshop 2001 Publication 2003 DEVELOPMENT OF A PHOSPHORUS TMDL FOR UPPER KLAMATH LAKE, OREGON (2000) Oregon Department of Environmental Quality (with Jake Kann, Aquatic Ecosystem Sciences) Data Analysis & Modeling of Shallow Hyper-Eutrophic Lake. Estimation of Inlake Phosphorus Target and External Phosphorus Loads Required to Achieve Compliance with Water Quality Standards. Development of Dynamic Phosphorus-Balance Model for Simulating Phosphorus, Chlorophyll-a, and pH. Model Considers Sediment Phosphorus Recycling Triggered by High pH. TMDL Report 2001 EVALUATION OF HIGHWAY 69 IMPROVEMENT PROJECT ON MILLE LACS LAKE, MINNESOTA (2001) Short, Elliot & Hendrickson, Inc., Minnesota Department of Transportation, & Minnesota Pollution Control Agency Evaluation of Water Quality Impacts Associated with Highway Construction & Resulting Development in Watershed of 207 mi2 Mille Lacs Lake, Minnesota. Development and Application of Models for Evaluating Near-Shore and Lake-Wide Water Quality Impacts of Alternative Highway Alignments. Report 2001 PHOSPHORUS BALANCE MODEL FOR LAKE ISTOKPOGA, FLORIDA (2002-2004) South Florida Water Management District Dynamic Model to Evaluate Shallow Lake Responses to Phosphorus Load. Used for TMDL Development. Publication 2003. MONITORING STRATEGIES FOR GULF OF MEXICO HYPOXIA (2002) Monitoring Strategies and Statistical Methods for Measuring Performance of Nutrient Loading Controls in the Mississippi River Basin. Workshop 2002. NATURAL RESOURCE ANALYSIS OF LAKE OKEECHOBEE PHOSPHORUS MANAGEMENT STRATEGIES (2002) Hazen and Sawyer, Inc. / South Florida Water Management District Review of Client's Report Summarizing the Applicability, Effectiveness, and Costs of Alternative Phosphorus Management Strategies for the Lake Okeechobee Watershed. PHOSPHORUS BALANCE MODELS FOR TULSA WATER SUPPLY RESERVOIRS (2002) Mc Kinney & Stringer P.C. , City of Tulsa, Tulsa Metropolitan Utility Authority Development and Applications of Dynamic Phosphorus Balance Models for Eucha and Spavinaw Reservoirs. Report 2002 PHOSPHORUS TMDL FOR ASSABETT RIVER (2003) Organization for the Assabet River, Concord, Massachusetts. Reviewed TMDL report. Data analysis; Phosphorus balance modeling; Recommendations for refining design of monitoring program. DEVELOPMENT OF CHLOROPHYLL-A CRITERIA FOR TEXAS RESERVOIRS (2003-2005) Allen Plummer Associates, Inc. / Texas Water Conservation Assoc. Technical Support in the Development Chlorophyll-a Criteria for Texas Reservoirs. Design and Analysis of Monitoring Programs and Public Surveys to Evaluate Relationships between Chlorophyll-a Concentrations and User-Perceived Impairments in Aesthetic Quality or Suitability for Recreational Uses in 9 Texas Reservoirs. NALMS 2004 Workshop 2003 Workshop 2004 Final Report 2005 EUTROPHICATION IN JENNINGS BAY, LAKE MINNETONKA (2002) HDR, Inc. / Minnehaha Creek Watershed District, Minnesota Value Engineering Workshop to Evaluate Eutrophication Problems in Lake Embayment. Report 2002 EVALUATING IMPACTS OF LAKESHORE DEVELOPMENT IN ITASCA COUNTY, MINNESOTA (2004-2005) Minnesota Department of Natural Resources Screening Methodology and Software for Ranking Regional Lakes Based Upon Sensitivity to Shoreline Development. Report 2005. PHOSPHORUS TMDL FOR THE SAUK RIVER CHAIN OF LAKES (2006-2009) Sauk River Watershed District, Minnesota Modeling Phosphorus and Related Eutrophication Indicators in 15 Interconnected Lakes. Estimation of TMDL to Achieve Water Quality Standards Report 2009 PHOSPHORUS TMDL FOR LITTLE ROCK LAKE, MINNESOTA (2009- ) Benton County Soil District, Minnesota Modeling Phosphorus and Related Eutrophication Indicators in 15 Interconnected Lakes. Estimation of TMDL to Achieve Water Quality Standards. UPPER KLAMATH LAKE PROJECT (2006- R2 Resource Assoc, U.S. Department of the Interior, Bureau of Reclamation & U.S. Department of Justice Evaluating Water Quality Impacts of Alternative Strategies for Managing Lake Water Levels. Expert Testimony. NUTRIENT BALANCES FOR KLAMATH RIVER RESERVOIRS, CALIFORNIA (2009-2010) Kier Associates Developed Dynamic Mass Balances for Reservoir Segments Along the Klamath River in Northern California Using Flow and Water Quality Data. MODELING THE BLACKSTONE RIVER BASIN, MASSACHUSETTS (2007-2009) Camp Dresser & McKee / Upper Blackstone Water Pollution Abatement District, Worcester Project Review Team for Development and Application of a Hydrology and Water Quality Model for the Blackstone River Basin (HSPF Model). Applied to Evaluate Point-Source and Non-Point-Source Control Strategies for Nutrients. Update in Progress.... http://www.wwwalker.net/projects.htm |