Anacostia River sewage treatment works, contract No. 9.

At head of title: P. W. A. Project No. Md. 1185-F. Washington Suburban Sanitary District.

Comparison of Hydrologic and Hydraulic Characteristics of the Anacostia River to Non-Urban Coastal Streams

Streams in urban areas often utilize channelization and other bank erosion control measures to improve flood conveyance, reduce channel migration, and overbank flooding. This leads to reductions in evapotranspiration and sediment storage on floodplains. The purpose of this study is to quantify the evapotranspiration and sediment transport capacity in the Anacostia Watershed, a large Coastal Plain urban watershed, and to compare these processes to a similar sized non-urban watershed. Times series data of hydrologic and hydraulic changes in the Anacostia, as urbanization progressed between 1939-2014, were also analyzed. The data indicates lower values of warm season runoff in the non-urban stream, suggesting a shift from evapotranspiration to runoff in urban streams. Channelization in the Anacostia also increased flow velocities and decreased high flow width. The high velocities associated with channelization and the removal of floodplain storage sites allows for the continued downstream transport of sediment despite stream bank stabilization.

PHYTOPLANKTON AND NUTRIENT DYNAMICS WITH A FOCUS ON NITROGEN FORM IN THE ANACOSTIA RIVER, IN WASHINGTON, D.C. AND WEST LAKE, IN HANGZHOU, CHINA

Nutrient loading has been linked with severe water quality impairment, ranging from hypoxia to increased frequency of harmful algal blooms (HABs), loss of fisheries, and changes in biodiversity. Waters around the globe are experiencing deleterious effects of eutrophication; however, the relative amount of nitrogen (N) and phosphorus (P) reaching these waters is not changing proportionately, with high N loads increasingly enriched in chemically-reduced N forms. Research involving two urban freshwater and nutrient enriched systems, the Anacostia River, USA, a tributary of the Potomac River feeding into the Chesapeake Bay, and West Lake, Hangzhou, Zhejiang Province, China, was conducted to assess the response of phytoplankton communities to changing N-form and N/P-ratios. Field observations involving the characterization of ambient phytoplankton communities and N-forms, as well as experimental (nutrient enrichment) manipulations were used to understand shifts in phytoplankton community composition with increasing NH4+ loads. In both locations, a >2-fold increase in ambient NH4+:NO3- ratios was followed by a shift in the phytoplankton community, with diatoms giving way to chlorophytes and cyanobacteria. Enrichment experiments mirrored this, in that samples enriched with NH4+ lead to increased abundance of chlorophytes and cyanobacteria. This work shows that in both of these systems experiencing nutrient enrichment that NH4+ supports communities dominated by more chlorophytes and cyanobacteria than other phytoplankton groups.

El Evento ‘Museo’: Aportes sobre el campo teórico de la Museología (1955-2015)

Desde hace mucho tiempo hemos defendido la idea de que Museo no es solo una institución, sino que debe ser entendido también como un proceso, fenómeno, flujo o acontecimiento. En el escenario contemporáneo del conocimiento, es fundamental que se pueda percibir al Museo más allá de su forma institucionalizada: solamente así será posible comprender con alguna precisión y profundidad sus nuevas formas de presentación y las relaciones que se establecen entre este fenómeno y las nuevas representaciones sociales. Este artículo presenta algunas reflexiones sobre el tema a partir del análisis de autores del campo museal, haciendo especial énfasis en los argumentos de base teórico-filosófica, o de base comunicacional, a partir de los cuales la Museología se ha estructurado como campo disciplinario.

Urban Catalyst: Continuing the Legacy of Massachusetts Avenue

This thesis proposes a reconnection of Massachusetts Avenue to the Anacostia River waterfront in Washington, DC. An intervention at the site of Reservation 13 will reconcile a difficult urban edge and reunite the neighborhood of Lincoln Park with the river. It also addresses the discontinuity of the avenue to the southeast and proposes the development of a bridge between the Western bank and ultimately Randle Circle. Along this reconciled corridor will be a series of architectural interventions that serve to promote community involvement. Ultimately this thesis is about generating an urban continuity and the cultural vibrancy and understanding that such a connection would foster.

Preliminary plan for the National Botanical Garden and Arboretum, Washington, D.C. : as recommended by the National Commission of Fine Arts /

Also covers part of Anacostia Park.

[Map of part of S.E. Washington D.C. now occupied by the Navy Yard and adjacent squares].

Covers area bounded by Anacostia River waterfront, 10th, L, and 5th streets S.E.