Salton Sea


William W. Walker, Jr., Ph.D.

Environmental Engineer

bill@wwwalker.net

Concord, Massachusetts

Resume    Projects   Linked-In

 Publications   Software


Major Projects

Everglades.  Technical Support for Water Quality & Hydrologic Restoration, prepared for U.S. Department of the Interior & other Government Agencies, 1989- 

P8  Urban Catchment Model,  Rainfall/Runoff Simulation to Support Design of BMPs for Urban Watersheds, prepared for U.S. Environmental Protection Agency, Minnesota Pollution Control Agency & Wisconsin Department of Natural Resources,  1990- .

Empirical Methods for Predicting Eutrophication in Impoundments,  prepared for Waterways Experiment Station, US Army Corps of Engineers, 1981- .

Dynamic Model for Everglades Stormwater Treatment Areas,  prepared for U.S. Dept of the Interior & U.S. Army Corps of Engineers,  2001- .

Onondaga Lake Ambient Monitoring Program, New York, 1998- .

Upper Klamath Lake Basin, Oregon  1995-

Lake Champlain Region, 1982-2011

Vadnais Lake Chain Diagnostic Study, St. Paul Water Utility, 1983-2000.

Summary of Water Quality Models, 1977-

Masters Thesis, Massachusetts Institute of Technology, 1971   

Ph.D. Thesis, Harvard University, 1977  


Nutrient Criteria, Models, & TMDL Reports

Interim Phosphorus Standards for the Everglades, in G. Gibson et al., Nutrient Criteria Technical Guidance Manual, Lakes & Reservoirs, Appendix B, U.S. Environmental Protection Agency, Office of Water, EPA-822-B000-001, April 2000.

Development of Chlorophyll-a Criteria to Support Recreational Uses of Texas Reservoirs.  presented at: Lakes: Habitat for Fish, Habitat for People, North American Lake Management Society Symposium, Victoria, British Columbia November 2004.   Workshop 2003    Workshop 2004    Project Final Report 2005

Consideration of Variability & Uncertainty in Phosphorus Total Maximum Daily Loads for Lakes,   Journal of Water Resources Planning & Management, ASCE, Vol. 129, No. 4,  pp. 337-344, July 2003.

Experience in Developing Phosphorus TMDLs for Lakes.  National Conference on Enhancing State Lake Management Programs, Chicago, April 2003. 

Quantifying Variability & Uncertainty in Phosphorus TMDLs for Lakes.  Annual Symposium, North American Lake Management Society, Madison, November 2001.

Quantifying Uncertainty in Phosphorus TMDLs for Lakes.  prepared for New England Interstate Water Pollution Control Commission & U.S. Environmental Protection Agency Region I,  March 2001.

Developing Phosphorus TMDLs for Lakes & Reservoirs.  Workshop on Water Quality Management & Restoration Using Settling Basins, Wetlands, & Other Watershed BMP's,  U.S. Army Corps of Engineers,  St. Paul,  March 2001.

Experience in Developing Phosphorus TMDLs for Shallow Lakes.  Annual Symposium, North American Lake Management Society, Miami, November 2000.|

Phosphorus TMDL for Lake Okeechobee, Florida.   Lake Okeechobee Technical Advisory Committee Meetings.  prepared for Florida Dept. of Environmental Protection & U.S. Department of the Interior.   April 6, 2000     May 3, 2000     May 4, 2000     May 31, 2000   August 1, 2000   Final Report Dec 27, 2000   Publications:  Bloom Frequency Analysis   Phosphorus Goal Development

Phosphorus TMDL for Upper Klamath Lake, Oregon.  prepared for Oregon Department of Environmental Quality, March 2001.

Phosphorus TMDL for Sauk River Chain of Lakes, Minnesota.  prepared for Sauk River Watershed District, August 2009.

Phosphorus TMDL for Little Rock Lake, Minnesota.  prepared for Benton Soil & Water Conservation District, April 2011.

Phosphorus TMDL for Lake Champlain, Vermont, Technical Support Final TMDL, 2002.

Phosphorus Balance Models for Eucha & Spavinaw Reservoirs,  Oklahoma.   prepared for Tulsa Water Authority,   August 2002.

Simplified Procedures for Eutrophication Assessment & Prediction, Prepared for US Army Corps of Engineers, 1978-1999.

GIS-Based Phosphorus Loading Model for Optimizing Agricultural BMP Allocation, LaPlatte River, Vermont.  1997.

Lake & Reservoir Restoration Guidance Manual, Chapter 4 - Predicting Lake Water Quality.  prepared for USEPA & NALMS,  1988.

Impacts of Proposed Wastewater Diversion on Eutrophication and Related Water Quality Conditions in the llinois River, Oklahoma.  prepared for State of Oklahoma, Office of the Attorney General, January 1987.

Some Recent Adaptations and Applications of QUAL2 in the Northeast.  EPA Water Quality Modelers Group , 1983.

Downstream Water Quality Impacts of Diversions from Sudbury Reservoir:  Data Analysis and Model Calibration.  prepared for IEP, Parsons Brinkerhoff, & Metropolitan District Commission, Massachusetts, 1983.


Monitoring Program Design & Data Analysis

Statistical Framework for the Onondaga Lake Monitoring Program, Onondaga County, New York, 1998-2012.

Long-Term Monitoring of Watersheds: Statistical Models & Examples. presented at "Science to Support Nutrient-Management Decisions Related to Hypoxia in the Northern Gulf of Mexico in the Mississippi River Basin", St. Louis, October 2002.

Water Quality Trends at Inflows to Everglades National Park, Water Resources Bulletin, 1991.

Eleven Years of Lake Eutrophication Monitoring in Vermont: A Critical Assessment, States Lakes Conf., 1989.

Evaluating Watershed Monitoring Programs.  prepared for City of Baltimore, 1988.

Land Use / Nutrient Export Relationships in the Northeast, Meta Systems, 1978.


Software

DMSTA - Dynamic Model for Everglades Stormwater Treatment Areas,, 2001-

EPGM - Everglades Phosphorus Gradient Model, 1996-2004.

P8 Urban Catchment Model for Designing Urban BMPs, 1990-2007

GISPLM - GIS-Based Phosphorus Loading Model for Optimal Allocation of Agricultural BMPs, 1997.

LRSD - Lake/Reservoir Sampling Design Worksheet, 1988

CNET - Reservoir Eutrophication Modeling Worksheet, 1988

PONDSIZ - Design Calculations for Wet Detention Ponds, 1987

PONDNET - Flow & Phosphorus Routing in Pond Networks, 1988

Software for Eutrophication Assessment & Prediction, USACE, 1985-1999

  • FLUX - Mass Discharge Computations for Tributaries

  • PROFILE - Analysis of Lake & Reservoir Monitoring Data

  • BATHTUB - Empirical Models for Lake & Reservoir Eutrophication

Custom Software for Specific Projects:  Load Calculations  Trend Analysis   Database


Selected Publications

Modeling Phosphorus Dynamics in Everglades Wetlands and Stormwater Treatment Areas, CREST,  2011.

Consideration of Variability & Uncertainty in Phosphorus Total Maximum Daily Loads for LakesASCE, July 2003.

Development and Application of a Phosphorus Balance Model for Lake Istokpoga, FloridaLake & Reservoir Mgt, 2003.

Development of a Phosphorus Goal in the TMDL Process for  Lake Okeechobee, FloridaLake & Reservoir Mgt, 2002.

Design Basis for Everglades Stormwater Treatment Areas, Water Resources Bulletin, 1995.

Relating Algal Bloom Frequencies to Phosphorus Concentrations in Lake Okeechobee, Lake & Reservoir Mgt, 1995.

Establishing a Chlorophyll-a Goal for a Run-of-the-River Reservoir, Lake & Reservoir Mgt., 1995.

Water Quality Trends at Inflows to Everglades National Park, Water Resources Bulletin, 1991.

Nutrient-Based Control Strategies for Taste-and-Odor, Proc. AWWA Conference, 1989.

Development of Lake Assessment Methods Based Upon the Aquatic Ecoregion Concept, Lake & Reservoir Mgt, 1989.

Eleven Years of Lake Eutrophication Monitoring in Vermont: A Critical Assessment, States Lakes Conf., 1989.

Design & Evaluation of Phosphorus Controls for the St. Paul Water Supply, Lake & Reservoir Mgt, 1989.

Developing Phosphorus Criteria for Minnesota Lakes, Lake & Reservoir Management, 1988.

Phosphorus Removal by Urban Runoff Detention Basins, Lake & Reservoir Management, 1987.

Design Calculations for Wet Detention Ponds,  St. Paul Water Utility, 1987.

Urban Non-Point Source Impacts on a Surface Water Supply, Proc. EPA Conf. on Non-Point Sources, 1985.

Statistical Bases for Mean Chlorophyll-a Criteria, Lake & Reservoir Mgt, 1985.

Trophic State Indicators in Reservoirs, Lake & Reservoir Management, 1984.

Calibration & Application of Qual-2 to the Lower Winooski River, Water Resources Bulletin, 1984.

Significance of Eutrophication in Water Supply Reservoirs, J.  American Water Works Assoc., 1983.

An Empirical Analysis of Phosphorus, Nitrogen, and Turbidity Effects on Reservoir Chlorophyll-a Levels, 1982.

A Sensitivity & Error Analysis Framework for Lake Eutrophication Modeling, Water Resources Bulletin, 1982.

Variability of Trophic State Indicators in Reservoirs, EPA Restoration of Lakes & Inland Waters, 1981.

Use of Hypolimnetic Oxygen Depletion Rate as a Trophic State Index for Lakes, Water Res. Research, 1979.


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