Publications

This document contains the method of producing both the Chesapeake Bay Program Land Use and the Phase 4.2 Watershed Model Landuse. It also documents the hindcasting & forecasting of model land use, the development of model segmentation, and model linkages.

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This study was undertaken to compare results obtained with standard and alternative, new techniques for total nitrogen and chlorophyll determination in estuarine water samples.

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An assessment of ambient toxicity of Delaware public peninsula creeks where agriculture is the dominant land use. The assessment evaluates potential persistent impacts and potential intermittent or pulsed impacts. Three watershed assessments have plastic culture practices.

This workshop was held to cover the topic of Sedimentsheds. sedimentshed is a new concept, and is defined as the area that contributes the sediment which directly influences water clarity in near-shore Submerged Aquatic Vegetation (SAV) grow zones.

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Chesapeake Bay watershed model precipitation and meteorological data development and atmospheric nutrient deposition.

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The Chesapeake Bay Groundwater Toxics Loading Workshop was held April 15-16, 1992, at the U.S. EPA Chesapeake Bay Program Office. Workshop participants reviewed and discussed available information on results from groundwater studies and developed a strategy to provide a firs order estimate of the magnitude of groundwater loads of toxic substances to Chesapeake Bay and its tidal tributaries. The participants also recommended that groundwater loads of nutrients should be assessed concurrently with the toxic substance loads.

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This report summarizes the findings of the workshop. The first objective of the workshop was to determine connections between issues, programs, agencies, organizations, and jurisdictions to advance their abilities to address atmospheric nitrogen issues. The second objective was to identify platforms for discussion of solutions, and the last objective was to determine research and policy work needed to advance the understanding of ecosystem impacts of nitrogen in the air and watershed.

Appendix F documents in detail the Phase IV Chesapeake Bay Watershed Model point source nutrient data assimilation process for the facilities located in signatory and non-signatory jurisdictions of the Chesapeake Bay Watershed. This document includes a description of the data sources, the methods of assimilation, types of analysis performed to determine nutrient reduction estimates, and trends in nutrient loadings discharged to the Chesapeake Bay Watershed. The Phase IV Watershed Model Point Source Database includes information for approximately 612 (the exact number varying depending on the year) active industrial, municipal, and federal facilities discharging directly to surface waters within the Chesapeake Bay watershed from all signatory and non-jurisdictions including: New York, Pennsylvania, Maryland, Delaware, District of Columbia, Virginia and West Virginia. Facility information, and flow and loading data are included for each of the 612 facilities for the years 1985 through 1996, 2000, Tributary Strategy Implementation (which is expected to occur after the year 2000) and additional nutrient reduction scenarios. The following flow and loading parameters are included: flow, total nitrogen, nitrate, organic nitrogen, total phosphorous, phosphate, organic phosphorous, biochemical oxygen demand, and dissolved oxygen.The nutrient point source loading data can be presented in both loads discharged at end of pipe and loads delivered to the Chesapeake Bay. To determine delivered loads, delivery factors were applied to the discharged loads to estimate attenuation as loads travel down the tributaries to the mainstem of the Chesapeake Bay. The total nitrogen load delivered to the Chesapeake Bay has decreased by 14 percent from 1985 to 1996, and is expected to decrease 27 percent from 1985 to 2000, and 33 percent from 1985 and Tributary Strategy Implementation (after 2000). These reductions are primarily due to facilities implementing biological nitrogen removal. The total phosphorous load delivered to the Chesapeake Bay has decreased 50 percent from 1985 to 1996, and is expected to decrease 55 percent from 1985 to 2000.

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Eutrophication -- low dissolved oxygen -- caused by excess nutrients, is the most significant water quality problem facing the Bay. The Chesapeake Bay Program jurisdictions have committed to reduce nitrogen and phosphorus pollution reaching the Bay by 40 percent from 1985 levels by the year 2000. This report addresses the cost effectiveness of various control options. This is an archived document.

This study was performed to compare standard EPA techniques for determining nitrogen and phosphorus concentrations in natural waters with oceanographic techniques typically employed by estuarine and marine scientists.

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