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Table IV-2. Regional Kd regression equations 
State-River segment Group 
Regional K d equation 
MARYLAND GROUP 1 
Bush River BSHOH, 
Gunpowder River GUNOH. 
Magothy River MAGOH. 
Middle River MIDOH. 
St. Mary’s River 1 
K d = 0.5545 + 0.3172 * Turbidity 11 ' 1 - 5 ’ + 0.0160*Chlorophyll a - 
0.0138*Salinity 
MARYLAND GROUP 2 
Eastern Bay-EASMH 
Lower Patuxent River-PAXMH 
Lower Potomac River-POTMH 
West/Rhode Rivers-WSTMH/RHDMH 
Kj = -0.1247 + 0.2820 * Turbidity (1 ' 1 ■*> + 0.0207*Chlorophyll a + 
0.0515*Salinity 
MARYLAND GROUP 3 
Fishing Bay/Chicamacomico River- 
FSH.MH. Severn River-SEVMH 
South River-SOUMH 
K d = 1.0895 + 0.4160 * Turbidity (I / , - 5) + 0.0140*Chlorophyll a - 
0.0950*Salinity 
MARYLAND GROUP 4 
Little Choptank River-LCHMH 
Miles/Wye Rivers-EASMH 
K d = -0.8991 + 0.4338 * Turbidity (1 ' 15) + 0.0180*Chlorophyll a + 
0.0912*Salinity 
MARYLAND GROUP 5 
Upper and Middle Patuxent River- 
PAXOH/PAXTF 
Kj = 0.8191 +0.2691 * Turbidity (1 '- 0.0084*Chlorophyll a + 
0.0384*Salinity 
MARYLAND GROUP 6 
Lower Chester River-CHSMH 
Middle Chester River-CHSOH 
K d = 0.0493 + 0.4658 * Turbidity (1 ' L5) + 0.0100*Chlorophyll a - 
0.0090*Salinity 
VIRGINIA GROUP 1 
Mattoponi River-MPNOHAtPNTF 
Chickahominv River-CHKOH 
James River-JMSPH JMSOH 
JMSMH JMSTF1 JMSTF2 
Appomatox River-APPTF 
K d = 1.192674757 + 0.295620722*Turbidity " ' '- 5) - 
0.056160407*Salinity + 0.000274598*Chlorophyll a 
VIRIGLNIA GROUP 2 
Upper Middle Pamunkey River-PMKOH PMKTF 
Lower York River-YRKPH YRKMH 
Lower Piankatank River-PIAMH 
Kj = 0.5275793536 + 0.3193475331 Turbidity (l ' lJ5) + 
0.0176700982*Salinity + 0.0271723238*Chlorophy 11 a 
Source: E. Perry (2006) Appendix D of this document. 
'Note: Group acronyms are a combination of river and salinity zone membership. An example is BSHOH where BSH=Bush River and 
OH=Ohgohaline zone. Salinity zones are TF=Tidal Fresh. OH=Ohgohaline. MH=Mesohaline. PH=Polyhaline. Refer to Table II-1. in 
Chapter 2 of this document for the Chesapeake Bay Program segmentation schemes. 
chapter iv • Refinements to Procedures for Assessing Chesapeake Bay Water Clarity and 5AV Criteria 
