ET-4C2 (6/24/05 version)
Chemical Integrity: Existing Sediment Reduction Targets

There are a number of existing sediment reduction targets for the State of Ohio. The targets presented in Table 1 summarize the "as is" sediment target situation in Ohio. Since all of these targets were developed prior to the NPS Plan 2005-2010, stakeholder questions were raised about the rationale and baseline data for the existing targets. Consequently, a future action item is to analyze the existing sediment reduction targets and refine as applicable to water quality attainment.

Table 1

Target Source of target Indicator Level Date to reach target
55% reduction in sediments entering Lake Erie Lake Erie Quality Index (LEQI) 3 N/A
Baseline (PDF 21kb): 1.1 M metric tons/year average load from Maumee, Grand, Cuyahoga and Sandusky watersheds (1991-1996). Above target translates to 0.5 M metric ton/year reduction from these four watersheds.
reduce sediment flowing into Lake Erie by 11.4% (150,000 metric tons/year) through establishing 67,000 (10% of 600,000 farmed riparian acres) acres of conservation treatments in 27 Lake Erie basin counties Lake Erie CREP 3 2010
Baseline (July 2004): The existing annual sediment load from the CREP area is unknown, so some assumptions had to made from available data (PDF 60kb). Conservation practices have been implemented on 21,952 (32% of target) acres resulting in a 90,000 metric ton/year sediment reduction.
reduce sediment run-off into Hoover Reservoir by 30% Upper Big Walnut CREP 1 2012
Baseline: The existing sediment load reduction target is designed to reduce loss of reservoir volume which adversely affects a safe yield of drinking water. Currently, sediment loading to Hoover Reservoir is measured with several proxy indicators including secchi disk measurements (2.5 to 3.0 feet; eutrophic range is 1.7 to 3.3 feet), turbidity levels in raw water, and reservoir sedimentation study results. Sedimentation rates vary between 0.2% and 0.5% annually depending on location within the reservoir. Average sediment loss from upland erosion is 1.2 tons/acre.
reduce sediment loading flowing into the Ohio River from the Scioto River basin by 20% Scioto CREP 3 2013
Baseline: The Scioto River basin carries over 350,000 metric tons of sediment annually to the Ohio River. Sediment loading data, by tributary, for the Pennsylvania, West Virginia, Ohio, Kentucky, Indiana, and Illinois portions of the Ohio River basin is available in "Assessment of Overland Runoff Nonpoint Source Pollution, 2003".