Dock, Detroit River, between 1st & 2nd Avenues

1 of 2

Dock, Detroit River, between 1st & 2nd Avenues

2 of 2

View of Detroit, Michigan, from Sandwich, Canada

From Gleason's pictorial drawing room companion, issue unidentified

Ambassador Bridge construction workers

On verso: Detroit-Windsor Bridge

Shooting Rapids at Sault-St-Maria [sic]

Sault Sainte Marie, Mich.

Saginaw River, Michigan; letter from the Secretary of the Army transmitting a letter from the Chief of Engineers ... submitting a report, together with accompanying papers and illustrations, on a review of reports on Saginaw River, Mich., with a view to determining the feasibility of improving Saginaw River or its tributaries for flood control and other purposes ...

Mode of access: Internet.

Kalamazoo River, Mich. Letter from the Secretary of War transmitting report from the Chief of Engineers on Kalamazoo River, Mich., covering navigation, flood control, power development, and irrigation.

Mode of access: Internet.

Architectural exhibition : Detroit Architectural Club and the Society of Arts and Crafts under the patronage and in the galleries of the Detroit Museum of Art, May 12 to 23 inclusive.

Includes index.

Meeting on housing between Detroit Urban League and City of Detroit, Common Council

On verso: Hearing--Common Council--City of Detroit, Pres. Remus G. Robinson, Sec'y Willam Price, On housing

Physical controls on carbon dioxide transfer velocity and flux in low-gradient river systems and implications for regional carbon budgets

Outgassing of carbon dioxide (CO(2)) from rivers and streams to the atmosphere is a major loss term in the coupled terrestrial-aquatic carbon cycle of major low-gradient river systems (the term ""river system"" encompasses the rivers and streams of all sizes that compose the drainage network in a river basin). However, the magnitude and controls on this important carbon flux are not well quantified. We measured carbon dioxide flux rates (F(CO2)), gas transfer velocity (k), and partial pressures (p(CO2)) in rivers and streams of the Amazon and Mekong river systems in South America and Southeast Asia, respectively. F(CO2) and k values were significantly higher in small rivers and streams (channels <100 m wide) than in large rivers (channels >100 m wide). Small rivers and streams also had substantially higher variability in k values than large rivers. Observed F(CO2) and k values suggest that previous estimates of basinwide CO(2) evasion from tropical rivers and wetlands have been conservative and are likely to be revised upward substantially in the future. Data from the present study combined with data compiled from the literature collectively suggest that the physical control of gas exchange velocities and fluxes in low-gradient river systems makes a transition from the dominance of wind control at the largest spatial scales (in estuaries and river mainstems) toward increasing importance of water current velocity and depth at progressively smaller channel dimensions upstream. These results highlight the importance of incorporating scale-appropriate k values into basinwide models of whole ecosystem carbon balance.

Assessment of Ametryn Contamination in River Water, River Sediment, and Mollusk Bivalves in Sao Paulo State, Brazil

Sao Paulo state, Brazil, is one of the main areas of sugar cane agriculture in the world. Herbicides, in particular, ametryn, are extensively used in this extensive area, which implies that this herbicide is present in the environment and can contaminate the surface water by running off. Thereby, residues of ametryn were analyzed in samples of river water an river sediment and in freshwater bivalves obtained from the rivers Sapucai, Pardo and Mogi-Guacu in Sao Paulo State, Brazil. Samples were taken in the winter of 2003 and 2004 in two locations in each river. The specimens of freshwater bivalves collected and analyzed were Corbicula fluminea, an exotic species, and Diplodon fontaineanus, a native species. Additionally, the evaluation of the ability of bioconcentration and depuration of ametryn by the freshwater bivalve Corbicula fluminea was also performed. Ametryn concentrations in the samples were measured by liquid chromatography coupled to mass spectrometry. Residues of ametryn in water (50 ng/L) and in freshwater bivalves (2-7 ng/g) were found in the Mogi-Guacu River in 2004, and residues in river sediments were found in all rivers in 2003 and 2004 (0.5-2 ng/g). The observation of the aquatic environment through the analysis of these matrixes, water, sediment, and bivalves, revealed the importance of the river sediment in the accumulation of the herbicide ametryn, which can contaminate the biota.