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of shallow-water habitat meeting the applicable water clarity criteria to support 
restoration of the remaining acres of SAV, beyond the SAV beds already mapped, 
necessary to reach that segment’s SAV restoration goal acreage. These measure¬ 
ments of SAV acreages and water clarity levels would be drawn from three years of 
data as previously described in the Regional Criteria Guidance (U.S. EPA 2003a). 
Here’s a hypothetical example of determining attainment of the shallow-water bay 
grass use using both mapped SAV acreage and shallow-water habitat acreage 
meeting the water clarity criteria. Segment X has an SAV restoration goal acreage of 
1,400 acres. Over the past three years, SAV beds totaling 1,100 acres have been 
mapped within the segment for at least one of the three years. Therefore, the 
remaining SAV acreage necessary to meet the segment’s restoration goal is 1,400 
acres (SAV restoration goal) minus 1,100 acres (SAV currently mapped) or 300 
acres. Beyond the currently vegetated shallow-water habitat, an additional 750 acres 
of shallow-water habitat (2.5 times 300 acres) would need to attain the water clarity 
criteria in order to determine that this segment is attaining the shallow-water bay 
grass use in combination with the 1,100 acres of mapped SAV. 
LITERATURE CITED 
Batiuk, R. A., P. Bergstrom, M. Kemp. E. Koch, L. Murray, J. C. Stevenson, R. Bartleson, V. 
Carter, N. B. Rybicki, J. M. Landwehr, C. Gallegos, L. Karrh, M. Naylor, D. Wilcox, K. A. 
Moore, S. Ailstock and M. Teichberg. 2000. Chesapeake Bay Submerged Aquatic Vegetation 
Water Quality and Habitat-Based Requirements and Restoration Targets: A Second Technical 
Synthesis. CBP/TRS 245/00 EPA 903-R-00-014. U.S. EPA Chesapeake Bay Program, 
Annapolis, Maryland. 
Batiuk. R. A., R. Orth, K. Moore, J. C. Stevenson. W. Dennison. L. Staver, V. Carter, N. B. 
Rybicki, R. Hickman, S. Kollar and S. Bieber. 1992. Chesapeake Bay Submerged Aquatic 
Vegetation Habitat Requirements and Restoration Targets: A Technical Synthesis. CBP/TRS 
83/92. U.S. EPA Chesapeake Bay Program, Annapolis, Maryland. 
Chesapeake Executive Council. 2003. Chesapeake Executive Council Directive No. 02-03: 
Meeting the Nutrient and Sediment Reduction Goals. Annapolis, Maryland. 
Moore, K„ D. Wilcox, R. Orth and E. Bailey. 1999. Analysis of historical distribution of 
submerged aquatic vegetation (SAV) in the James River. Special Report No. 355 in Applied 
Marine Science and Ocean Engineering. Virginia Institute of Marine Science, School of 
Marine Science, College of William and Mary, Gloucester Point, Virginia. 
Moore, K. A., D.J. Wilcox and R. J. Orth. 2000. Analysis of the abundance of submersed 
aquatic vegetation communities in the Chesapeake Bay. Estuaries 23 (1): 1 15-127. 
Moore, K., D. Wilcox and B. Anderson. 2001. Analysis of historical distribution of 
submerged aquatic vegetation (SAV) in the York and Rappahannock rivers as evidence of 
historical water quality conditions. Special Report No. 375 in Applied Marine Science and 
Ocean Engineering. Virginia Institute of Marine Science, School of Marine Science, College 
of William and Mary, Gloucester Point, Virginia. 
chapter vii 
Updated Guidance for Application of Water Clarity Criteria and SAV Restoration Goal Acreages 
