Achieving Nutrient and Sediment Reduction Goals in the by National Research Council, Division on Earth and Life

By National Research Council, Division on Earth and Life Studies, Water Science and Technology Board, Committee on the Evaluation of Chesapeake Bay Program Implementation for Nutrient Reduction to Improve Water Quality

The Chesapeake Bay is North America's greatest and such a lot biologically different estuary, in addition to a massive advertisement and leisure source. despite the fact that, over the top quantities of nitrogen, phosphorus, and sediment from human actions and land improvement have disrupted the atmosphere, inflicting destructive algae blooms, degraded habitats, and lowered populations of many species of fish and shellfish. In 1983, the Chesapeake Bay application (CBP) was once tested, in keeping with a cooperative partnership one of the U.S. Environmental safety employer (EPA), the kingdom of Maryland, and the commonwealths of Pennsylvania and Virginia, and the District of Columbia, to deal with the level, complexity, and resources of toxins coming into the Bay. In 2008, the CBP introduced a sequence of tasks to extend the transparency of this system and heighten its responsibility and in 2009 an government order injected new power into the recovery. furthermore, as a part of the impression to enhance the speed of development and elevate responsibility within the Bay recovery, a two-year milestone process was once brought geared toward decreasing total pollutants within the Bay by way of targeting incremental, momentary commitments from all the Bay jurisdictions. The nationwide examine Council (NRC) verified the Committee at the review of Chesapeake Bay application Implementation for Nutrient aid in enhance Water caliber in 2009 in line with a request from the EPA. The committee was once charged to evaluate the framework utilized by the states and the CBP for monitoring nutrient and sediment keep an eye on practices which are applied within the Chesapeake Bay watershed and to judge the two-year milestone process. The committee used to be additionally to evaluate present adaptive administration options and to suggest advancements which can aid CBP to fulfill its nutrient and sediment relief objectives. The committee didn't try to determine each attainable approach which may be carried out yet as a substitute fascinated by methods that aren't being applied to their complete strength or that could have big, unrealized power within the Bay watershed. simply because a lot of those ideas have coverage or societal implications which could now not be absolutely evaluated by means of the committee, the suggestions aren't prioritized yet are provided to inspire extra attention and exploration one of the CBP companions and stakeholders.

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Extra resources for Achieving Nutrient and Sediment Reduction Goals in the Chesapeake Bay: An Evaluation of Program Strategies and Implementation

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Estimates of Nitrogen Source Loads to the Bay Approximately 400 million pounds (181 million kg) of nitrogen compounds emitted to the atmosphere are deposited on the Bay’s watershed each year, with approximately 68 percent coming from NOy and 32 percent from NHx (R. Dennis, EPA, personal communication, 2011). Sources of atmospheric nitrogen are described in Box 1-4. , “municipal” and/or “industrial” point sources,” “urban” and/or “agricultural” point or nonpoint sources. In many cases, it is expeditious to aggregate urban and agricultural point sources and nonpoint sources, in which case the terms “urban runoff” and “agricultural runoff” are used to incorporate the two but do not include discharges from municipal or industrial wastewater treatment facilities.

5 million kg) (Figure 1-2). 3 million kg/year) of phospho- Copyright © National Academy of Sciences. All rights reserved. 5 The largest contributing sectors included urban/suburban runoff (including in-stream sediment) (31 percent), excess animal waste from agricultural areas (26 percent), municipal wastewater treatment plants and industrial discharge (21 percent), and excess fertilizer from agricultural areas (19 percent). Sediments Sediment delivery to coastal waters by rivers and streams is a natural process created by the weathering of rocks and soil, but agricultural and urban/suburban activities have accelerated erosion and are now major contributors to sediment loads to the Bay (Figure 1-8).

The Chesapeake Bay Tributary Strategies, released during 2004-2006, outlined partner-specific implementation activities within each tributary necessary to remove the Bay and tributaries from the impaired waters list (summarized in EPA, 2010a). In 2007, the CBP re-evaluated the nutrient and sediment cap loads and found that sufficient progress had not been made toward improving water quality (CBP, 2007a). These findings led to the development of the two-year milestone strategy, the federal Chesapeake Bay TMDL, and watershed implementation plans, described later in this chapter.

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