Accurate quantification of riverine water‐quality concentration and flux is challenging because monitoring programs typically collect concentration data at lower frequencies than discharge data. Statistical methods are often used to estimate concentration and flux on days without observations. One recently developed approach is the Weighted Regressions on Time, Discharge, and Season (WRTDS), which has been shown to provide among the most accurate estimates compared to other common methods.

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In the annual IAN Report Card, IAN staff reflect back on accomplishments from 2018. The self-assessment is based on indicators in three categories: social impacts, ecological outcomes, and partner engagement. Overall, IAN received an overall grade of B (86%) which is an improvement from the 2017 score of B- (81%).

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Aerial surveys of coastal habitats can uniquely inform the science and management of shallow, coastal zones, and when repeated annually, they reveal changes that are otherwise difficult to assess from ground-based surveys. This paper reviews the utility of a long- term (1984–present) annual aerial monitoring program for submersed aquatic vegetation (SAV) in Chesapeake Bay, its tidal tributaries, and nearby Atlantic coastal bays, USA.

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This report card provides a transparent, timely, and geographically detailed assessment of Chesapeake Bay. In 2018, the report card includes five water quality indicators and two biotic indicators. In 2018, the overall grade for Chesapeake Bay is a 46%, a C. This means the Bay is in moderate health. Despite the decrease in score from 2017, overall bay health is still significantly improving over time. Long term trends of each reporting region health and a fisheries index are also presented.

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Flux quantification for riverine water-quality constituents has been an active area of research. Statistical approaches are often employed to make estimation for days without observations. One such approach is the Weighted Regressions on Time, Discharge, and Season (WRTDS) method. While WRTDS has been used in many investigations, there is a general lack of effort to identify factors that influence its estimation bias.

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Water clarity is an important ecosystem indicator of eutrophication in Chesapeake Bay and other coastal and estuarine systems across the globe. Although a variety of measures are available to quantify light availability in water, Secchi disk depths have been the most consistent and frequent measure employed in water monitoring programs.

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Nutrient reduction efforts have been undertaken in recent decades to mitigate the impacts of eutrophication in coastal and estuarine systems worldwide. To track progress in response to one of these efforts we use Generalized Additive Models (GAMs) to evaluate a diverse suite of water quality constituents over a 32-year period in the Chesapeake Bay, an estuary on the east coast of the United States.

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This guide includes detailed instructions for volunteers who are using the Water Reporter platform to collect and submit data for the Chesapeake Bay SAV Watchers Introductory Monitoring Program.

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The Methods Manual includes background information on SAV and the Chesapeake Bay SAV Watchers Monitoring Program, detailed protocol for the Advanced Monitoring Program (Tier 2), safety information, an updated SAV species guide, and many other resources.

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A pocket-sized SAV species identification guide that also includes a field packing list, protocol reminders, and reference photos of other macrophytes. For use in the field by volunteers participating in the Chesapeake Bay SAV Watchers Introductory and Advanced Monitoring Programs. This version is designed to be viewed on a phone or computer screen.

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