REPLY TO DISCUSSION by Ray C. Whittemore : “Methodologies for Calibration and Predictive Analysis...
1
We thank the author for the appreciation expressed, not only for acknowledging the contribu- tion but for bringing attention to the current status of watershed modeling and TMDL development. The challenges in achieving the goals of the Clean Water Act are manifold. Our goal was to address some of the difficulties many practitioners face and to provide alternatives, using a modeling approach that ulti- mately may have widespread acceptance for estab- lishing loadings to waterbodies. As pointed out by the discussion author, HSPF has stood the test of time. Over a period of several decades the science and code constructs comprising HSPF have been updated. A number of federal and state agencies, services, and departments are apply- ing and evaluating HSPF in their work. The USEPA Office of Water software BASINS has brought HSPF to a much wider community of users. BASINS includes a geographic information system, required input datasets, HSPF control and output file editing, and visualization utilities in one interface. No longer is a user required to build control files by hand. Mak- ing HSPF easier to use has been achieved. Intelligent use of this complex model, encompassing such issues as data quality, parameter sensitivity, and predictive analysis are now deserving of attention. We agree that with more widespread use of HSPF comes the burden of assuring scientifically credible and defensible TMDLs. Given the number of impaired waterbodies at stake this is not best tackled by a select few modelers. Nor is this a task for less experi- enced modelers limited to performing numerous parameter investigations “by hand” with limited resources and time constraints. Automated parameter estimation software packages are no panacea, howev- er they greatly inform the modeling process. They are a tool demonstrated to increase a modeler’s efficiency and provide valuable information when used appro- priately. 1 Discussion No. 02004D-2 of the Journal of the American Water Resources Association 40(1):267. 2 Paper No. 02004 of the Journal of the American Water Resources Association 39(2):251-265. 3 Respectively, Department of Environmental Engineering, University of Queensland, Australia; and USEPA/ORD/NERL, Ecosystems Research Division, 960 College Station Road, Athens, Georgia 30605 (E-Mail/Johnston: [email protected]). JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION 268 JAWRA JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION FEBRUARY AMERICAN WATER RESOURCES ASSOCIATION 2004 REPLY TO DISCUSSION by Ray C. Whittemore 1 “Methodologies for Calibration and Predictive Analysis of a Watershed Model” 2 John Doherty and John M. Johnston 3
REPLY TO DISCUSSION by Ray C. Whittemore : “Methodologies for Calibration and Predictive Analysis of a Watershed Model”
We thank the author for the appreciationexpressed, not only for acknowledging the contribu-tion but for bringing attention to the current status ofwatershed modeling and TMDL development. Thechallenges in achieving the goals of the Clean WaterAct are manifold. Our goal was to address some of thedifficulties many practitioners face and to providealternatives, using a modeling approach that ulti-mately may have widespread acceptance for estab-lishing loadings to waterbodies.
As pointed out by the discussion author, HSPF hasstood the test of time. Over a period of severaldecades the science and code constructs comprisingHSPF have been updated. A number of federal andstate agencies, services, and departments are apply-ing and evaluating HSPF in their work. The USEPAOffice of Water software BASINS has brought HSPFto a much wider community of users. BASINSincludes a geographic information system, requiredinput datasets, HSPF control and output file editing,and visualization utilities in one interface. No longeris a user required to build control files by hand. Mak-ing HSPF easier to use has been achieved. Intelligentuse of this complex model, encompassing such issuesas data quality, parameter sensitivity, and predictiveanalysis are now deserving of attention.
We agree that with more widespread use of HSPFcomes the burden of assuring scientifically credibleand defensible TMDLs. Given the number of impairedwaterbodies at stake this is not best tackled by aselect few modelers. Nor is this a task for less experi-enced modelers limited to performing numerousparameter investigations “by hand” with limitedresources and time constraints. Automated parameterestimation software packages are no panacea, howev-er they greatly inform the modeling process. They area tool demonstrated to increase a modeler’s efficiencyand provide valuable information when used appro-priately.
1Discussion No. 02004D-2 of the Journal of the American Water Resources Association 40(1):267.2Paper No. 02004 of the Journal of the American Water Resources Association 39(2):251-265.3Respectively, Department of Environmental Engineering, University of Queensland, Australia; and USEPA/ORD/NERL, Ecosystems
Research Division, 960 College Station Road, Athens, Georgia 30605 (E-Mail/Johnston: [email protected]).
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION 268 JAWRA
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATIONFEBRUARY AMERICAN WATER RESOURCES ASSOCIATION 2004
REPLY TO DISCUSSIONby Ray C. Whittemore1
“Methodologies for Calibration and Predictive Analysis of a Watershed Model”2
John Doherty and John M. Johnston3
Used Mac Distiller 5.0.x Job Options
This report was created automatically with help of the Adobe Acrobat Distiller addition "Distiller Secrets v1.0.5" from IMPRESSED GmbH. You can download this startup file for Distiller versions 4.0.5 and 5.0.x for free from http://www.impressed.de. GENERAL ---------------------------------------- File Options: Compatibility: PDF 1.4 Optimize For Fast Web View: No Embed Thumbnails: Yes Auto-Rotate Pages: No Distill From Page: 1 Distill To Page: All Pages Binding: Left Resolution: [ 2400 2400 ] dpi Paper Size: [ 630 810 ] Point COMPRESSION ---------------------------------------- Color Images: Downsampling: Yes Downsample Type: Bicubic Downsampling Downsample Resolution: 350 dpi Downsampling For Images Above: 525 dpi Compression: Yes Automatic Selection of Compression Type: Yes JPEG Quality: Maximum Bits Per Pixel: As Original Bit Grayscale Images: Downsampling: Yes Downsample Type: Bicubic Downsampling Downsample Resolution: 350 dpi Downsampling For Images Above: 525 dpi Compression: Yes Automatic Selection of Compression Type: Yes JPEG Quality: Maximum Bits Per Pixel: As Original Bit Monochrome Images: Downsampling: No Compression: Yes Compression Type: CCITT CCITT Group: 4 Anti-Alias To Gray: No Compress Text and Line Art: Yes FONTS ---------------------------------------- Embed All Fonts: Yes Subset Embedded Fonts: No When Embedding Fails: Cancel Job Embedding: Always Embed: [ ] Never Embed: [ ] COLOR ---------------------------------------- Color Management Policies: Color Conversion Strategy: Leave Color Unchanged Intent: Default Device-Dependent Data: Preserve Overprint Settings: Yes Preserve Under Color Removal and Black Generation: No Transfer Functions: Remove Preserve Halftone Information: No ADVANCED ---------------------------------------- Options: Use Prologue.ps and Epilogue.ps: No Allow PostScript File To Override Job Options: No Preserve Level 2 copypage Semantics: Yes Save Portable Job Ticket Inside PDF File: No Illustrator Overprint Mode: Yes Convert Gradients To Smooth Shades: Yes ASCII Format: No Document Structuring Conventions (DSC): Process DSC Comments: Yes Log DSC Warnings: No Resize Page and Center Artwork for EPS Files: No Preserve EPS Information From DSC: No Preserve OPI Comments: No Preserve Document Information From DSC: Yes OTHERS ---------------------------------------- Distiller Core Version: 5000 Use ZIP Compression: Yes Deactivate Optimization: No Image Memory: 524288 Byte Anti-Alias Color Images: No Anti-Alias Grayscale Images: No Convert Images (< 257 Colors) To Indexed Color Space: Yes sRGB ICC Profile: sRGB IEC61966-2.1 END OF REPORT ---------------------------------------- IMPRESSED GmbH Bahrenfelder Chaussee 49 22761 Hamburg, Germany Tel. +49 40 897189-0 Fax +49 40 897189-71 Email: [email protected] Web: www.impressed.de
