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

Environmental Engineer

bill@wwwalker.net

Concord, Massachusetts

Resume    Projects    Reports 

 Publications   Software

 

Agency Lakes, Upper Klamath Basin, Oregon.  
Google Earth View   Algal Bloom June 2005. 


Various Topics

P8  Urban Catchment Model,  Rainfall/Runoff Simulation to Support Design of BMP's for Urban Watersheds, prepared for U.S. Environmental Protection Agency, Minnesota Pollution Control Agency & Wisconsin Department of Natural Resources,  1990-2007.

BATHTUB  -  Empirical Models for Lake & Reservoir Eutrophication,  prepared for Waterways Experiment Station, US Army Corps of Engineers, 1981-2006.

Dynamic Model for Everglades Stormwater Treatment Areas,  prepared for U.S. Dept of the Interior & U.S. Army Corps of Engineers,  2001-2005.

Everglades Reports.  prepared for U.S. Department of the Interior, 1990-2009.

Technical Support for the Onondaga Lake Ambient Monitoring Program, 1998-2009.

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


Nutrient Criteria, Modeling, & TMDL Reports

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.

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 TMDL's for Lakes, National Conference on Enhancing the States' Lake Management Programs, Chicago, April 2003. 

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

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

Developing Phosphorus TMDL's 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 TMDL's for Shallow Lakes.  Annual Symposium, North American Lake Management Society, Miami, November 2000.

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

Phosphorus TMDL for Lake Okeechobee.   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

Lake Champlain Phosphorus TMDL, Vermont & New York,  Support Final TMDL, 2002.

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

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

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


Monitoring Program Design & Data Analysis

Statistical Framework for the Onondaga Lake Monitoring Program, Onondaga County, New York, 1998-2007.

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.

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


Software Available Here

EPGM - Everglades Phosphorus Gradient Model, 1996, August 2004

GISPLM - GIS-Based Phosphorus Loading Model, 1997.

P8  Urban Catchment Model, 2007


Software Available from Waterways Experiment Station, U.S. Army Corps of Engineers

  • FLUX - Mass Discharge Computations for Streams, Version 5.1

  • PROFILE - Analysis of Lake & Reservoir Monitoring Data, Version 5.0

  • BATHTUB - Empirical Models for Lake & Reservoir Eutrophication

Documentation      Program Descriptions      Download 


Software Available by Request

  • LRSD - Lake/Reservoir Sampling Design Worksheet

  • CNET - Reservoir Eutrophication Modeling Worksheet

  • PONDSIZ - Design Calculations for Wet Detention Ponds

  • PONDNET - Flow & Phosphorus Routing in Pond Networks


Selected Publications

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.

A Sensitivity & Error Analysis Framework for Lake Eutrophication Modelling, 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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