Water quality in the Connecticut, Housatonic, and Thames River basins, Connecticut, Massachusetts, New Hampshire, New York, and Vermont, 1992-95

Garabedian, Stephen P.; Coles, James F.; Grady, S.J.; Trench, Elaine C. Todd; Zimmerman, Marc J.

doi:10.3133/cir1155

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…Median concentrations of TP in all IS groups were higher (3–4×) compared to those found in some studies (Tufford et al , ; Schoonover et al , ; Crim, ) and exceeded the EPA ambient water quality criteria for rivers in the Southeastern Coastal Plain (0.04 mg L −1 ) by an order of magnitude in some watersheds (U.S. EPA, ). However, TP concentrations in the most urbanized streams of the present study were considerably lower than those reported in Garabedian et al () for streams in the northeast U.S with high wastewater inputs (e.g. 1.4 mg L −1 ).…”

Section: Discussioncontrasting

confidence: 87%

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Effects of urbanization on stream hydrology and water quality: the Florida Gulf Coast

Nagy

Lockaby

Kalin

et al. 2011

Hydrological Processes

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At the global scale, the population density of coastal areas is nearly three times that of inland areas, and consequently, land development represents a threat to coastal ecosystems. It is critical to understand how increasing urbanization affects coastal watersheds. To that end, the objective of this study was to examine the influence of urban development on stream water quality and hydrology in a coastal setting, a scenario that has received less attention than other physiographic regions. Stream hydrologic, physicochemical, and microbial data were collected in watersheds near Apalachicola, Florida with a range of impervious surfaces from 0 to 15%. Watersheds with greater impervious cover exhibited higher pH, specific conductance, and temperature, elevated nutrient concentrations and loads (Cl À , NO 3 À , SO 4 2À , Na + , K + , Mg 2+ , Ca 2+ , and total phosphorus), higher bacterial concentrations (fecal coliform and Escherichia coli), and increased maximum flow and hydrograph flashiness. Different responses to development here compared to other physiographic regions included lower total suspended solid concentrations, higher total dissolved solid concentrations, and a lack of response of base flow to increased urbanization. Additionally, Na + and Cl À concentrations were elevated to a greater extent than is often the case in non-coastal areas. In the coming years, urban development is projected to increase substantially in coastal zones and thus there is risk of further stream degradation in coastal watersheds.Significant difference among IS classes indicated by different letters. † p = 0.07 TP = total phosphorus, DOC = dissolved organic carbon, TDN = total dissolved nitrogen, TSS = total suspended solids, and TDS = total dissolved solids.URBANIZATION EFFECTS ON WATER RESOURCES † Total forest includes evergreen, mixed, and forested wetlands. NS indicates the relationship was not significant at the 0.05 probability level. TP = total phosphorus, DOC = dissolved organic carbon, TDN = total dissolved nitrogen, TSS = total suspended solids, and TDS = total dissolved solids. R. C. NAGY ET AL Q avg = average flow, Q min = minimum flow, Q 0.1% = flow exceeded 99.9% of the time, Q 1% = flow exceeded 99% of the time, Q 50% = median flow, Q max = maximum flow, RB = flashiness index, and BF = base flow. R. C. NAGY ET AL

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Section: Discussioncontrasting

confidence: 87%

“…Increased TP in urban streams is commonly associated with wastewater and fertilizer use in urban areas (Garabedian et al , ; Paul and Meyer, ). Higher TP concentrations and loads were observed in watersheds with higher IS cover (Tables and and Figure ) and corroborate the findings of Tufford et al () in South Carolina coastal streams.…”

Section: Discussionmentioning

confidence: 99%

Effects of urbanization on stream hydrology and water quality: the Florida Gulf Coast

Nagy

Lockaby

Kalin

et al. 2011

Hydrological Processes

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“…Mean annual precipitation ranges from 1200 mm near the coast to about 900 mm in the northern part of the basin, and precipitation is evenly distributed throughout the year (Garabedian et al ., 1998; Magilligan and Nislow, 2001). Mean annual discharge of the Connecticut River is 550 m 3 s −1 (Garabedian et al ., 1998), with peak flows typically occurring in late winter and early spring and low flows in late summer (Magilligan and Graber, 1996). Forty‐four major tributaries (each with a drainage basin of at least 78 km 2 ) flow into the Connecticut River.…”

Section: Methodsmentioning

confidence: 99%

Determining the effects of dams on subdaily variation in river flows at a whole‐basin scale

Zimmerman

Letcher

Nislow

et al. 2010

River Research & Apps

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River regulation can alter the frequency and magnitude of subdaily flow variations causing major impacts on ecological structure and function. We developed an approach to quantify subdaily flow variation for multiple sites across a large watershed to assess the potential impacts of different dam operations (flood control, run-of-river hydropower and peaking hydropower) on natural communities. We used hourly flow data over a 9-year period from 30 stream gages throughout the Connecticut River basin to calculate four metrics of subdaily flow variation and to compare sites downstream of dams with unregulated sites. Our objectives were to (1) determine the temporal scale of data needed to characterize subdaily variability; (2) compare the frequency of days with high subdaily flow variation downstream of dams and unregulated sites; (3) analyse the magnitude of subdaily variation at all sites and (4) identify individual sites that had subdaily variation significantly higher than unregulated locations. We found that estimates of flow variability based on daily mean flow data were not sufficient to characterize subdaily flow patterns. Alteration of subdaily flows was evident in the number of days natural ranges of variability were exceeded, rather than in the magnitude of subdaily variation, suggesting that all rivers may exhibit highly variable subdaily flows, but altered rivers exhibit this variability more frequently. Peaking hydropower facilities had the most highly altered subdaily flows; however, we observed significantly altered ranges of subdaily variability downstream of some flood-control and run-of-river hydropower dams. Our analysis can be used to identify situations where dam operating procedures could be modified to reduce the level of hydrologic alteration.

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Storage and export of nutrient and oxyhydroxide elements across glaciated soils and watersheds in western Massachusetts, USA

Richardson

2023

CATENA

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Water quality in the Connecticut, Housatonic, and Thames River basins, Connecticut, Massachusetts, New Hampshire, New York, and Vermont, 1992-95

Cited by 7 publications

References 2 publications

Effects of urbanization on stream hydrology and water quality: the Florida Gulf Coast

Effects of urbanization on stream hydrology and water quality: the Florida Gulf Coast

Determining the effects of dams on subdaily variation in river flows at a whole‐basin scale

Storage and export of nutrient and oxyhydroxide elements across glaciated soils and watersheds in western Massachusetts, USA

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