Publications

This is a report on the effect of pH on the release of phosphorous from the Potomac River sediment.

Nine action recommendations derived from a 1996 nutrient conference are addressed.

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The Wetlands Implementation Plan is designed to achieve the wetlands policy goals of the Chesapeake Bay Agreement. Both guidance and recommendations to restructure the original implementation plan are addressed.

This is a report on Deposition of Air Pollutants to the Great Waters: First Report to Congress.

The Monitoring Subcommittee of the Chesapeake Bay Program decided to implement a Chesapeake Bay Coordinated Split Sample Program, using field split samples, that was to begin in May or June 1989. As part of the planning for that program, an analysis of the data from the past Chesapeake Bay split sample programs was undertaken. This report gives the results of the analysis.

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The overall modeling framework used to assess Virginia's tributary strategies in 1999 is documented. This synthesis report provides an overview of the Chesapeake Bay Program airshed, watershed, and estuary models and other diagnostic tools which were applied to determine tributary allocations for each of the four lower Virginia basins; the Rappahannock, York, Hames, and Easter Shore Virginia. The publication describes the model scenarios developed to test various management options aimed at improving water and bay grasses quality through different levels of nutrient and sediment reductions. Tracer analyses are presented to better understand the hydrologic interactions among tributaries and the mainstem Bay. Watershed and estuarine physical descriptions, flows and nutrient and sediment loadings of the lower Chesapeake Bay system are detailed. As responses to these loadings, modeled measures of water and habitat quality, needed to sustain key living resources, are interpreted and address.

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A major force in establishing the present land use pattern has been the desire of people to locate primary residences in low density settings and second homes near the water. Unfortunately, development in agricultural, forest, and shore front areas chews up valuable farmland, woodland, and shore access areas and destroys existing local economies. this document addresses these concerns.

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The hydrologic calibration of the phase 5 watershed model was evaluated through 9 published acceptable criteria used in HSPF Expert system. The specific flow characteristics evaluated are: Error in total volume; Error in low flow or base flow recession; Error in 50% lowest flow; Error in 10% highest flow; Error in storm volumes; Summer volume error; Winter volume error; Summer storm volume error; and Storm peaks simulated verses observed for selected storms in inches. One Phase 5 base flow statistic was also used.

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This work contains the following themes as they relate to the Chesapeake Bay: The Living Natural Bay/Ecosystems

Comparison of simulated and observed flow for 8 years of calibration (1984-1991).

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