Water quality in the Georgia-Florida coastal plain, Georgia and Florida, 1992-96

Berndt, Marian P.; Hatzell, Hilda H.; Crandall, Christy A.; Turtora, Michael; Pittman, John R.; Oaksford, Edward T.

doi:10.3133/cir1151

Cited by 23 publications

(15 citation statements)

References 1 publication

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“…Of other Alabama rivers studied, from 1999 to 2001 [25] and 2006 to 2007 [23], most had TP concentrations that were within 0.06 mg/L of our mean concentration, though one was half the LCR mean TP concentration and two were over four times the concentration found in our study (Table 6). A Georgia-Florida drainage study (1992 to 1996) found mean OP levels for primary agricultural streams to be 0.06 mg/L and 0.08 mg/L for urban sites [26], which was slightly lower than the mean OP concentration of 0.097 mg/L in our study. [29] Yazoo River, Mississippi (1984 to 1993) 0.26 Atkins et al [30] Mobile River Basin, Alabama (1998 to 1999) 0.10…”

Section: Comparison To Regional Datacontrasting

confidence: 44%

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Past, Present, and Future Nutrient Quality of a Small Southeastern River: A Pre-Dam Assessment

Miller

Stewart

2013

Water

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Riverine dams alter both the physical environment and water chemistry, thus affecting species assemblages within these environments. In the United States, dam construction is on the decline and there is a growing trend for dam removal. The Choctawhatchee, Pea, and Yellow Rivers Watershed Management Authority had initiated the permitting process for placing a reservoir dam on the Little Choctawhatchee River (LCR), a tributary to the Choctawhatchee River. The purpose of the proposed reservoir was water supply, and while the permit application has been suspended, history shows that this or related projects are likely to arise in the future. This study collected data on nutrient quality seasonally (four times) from 12 sites in the LCR watershed from October 2007 to June 2008 in order to determine pre-dam conditions and to compare these data to historical and regional information. Historical and current nutrient concentrations were elevated throughout the watershed, in most cases above suggested criteria, and indicated that water quality of the river was and continues to be nutrient rich. A future reservoir at recent levels of water quality will likely be highly eutrophic, and anthropogenic influences will further stress this ecosystem and its water quality as the urban region expands.

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Section: Comparison To Regional Datacontrasting

confidence: 44%

“…Berndt et al [26] found that 30% of the Georgia-Florida sites reported had TP concentrations higher than 0.1 mg/L, which is the non-regulatory U.S. EPA TP goal, which poses a nuisance algal threat when exceeded. Of the 48 samples taken in our study, 40 samples (>80%), had TP concentrations exceeding the non-regulatory goal.…”

Section: Comparison To Regional Datamentioning

confidence: 99%

Past, Present, and Future Nutrient Quality of a Small Southeastern River: A Pre-Dam Assessment

Miller

Stewart

2013

Water

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“…The well water was from a confined portion of the Upper Floridian aquifer with temperatures that ranged from 15 to 17°C. The National Water Quality Assessment Program described nitrate concentrations in confined areas of the Upper Floridian aquifer as <0.50 mg NO 3 –N L −1 and total phosphorus concentrations as below 0.05 mg P L −1 (Berndt et al, 1998).…”

Section: Methodsmentioning

confidence: 99%

Nitrogen and Phosphorus Runoff Losses from Variable and Constant Intensity Rainfall Simulations on Loamy Sand under Conventional and Strip Tillage Systems

et al. 2007

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Further studies on the quality of runoff from tillage and cropping systems in the southeastern USA are needed to refine current risk assessment tools for nutrient contamination. Our objective was to quantify and compare effects of constant (Ic) and variable (Iv) rainfall intensity patterns on inorganic nitrogen (N) and phosphorus (P) losses from a Tifton loamy sand (Plinthic Kandiudult) cropped to cotton (Gossypium hirsutum L.) and managed under conventional (CT) or strip-till (ST) systems. We simulated rainfall at a constant intensity and a variable intensity pattern (57 mm h(-1)) and collected runoff continuously at 5-min intervals for 70 min. For cumulative runoff at 50 min, the Iv pattern lost significantly greater amounts (p < 0.05) of total Kjeldahl N (TKN) and P (TKP) (849 g N ha(-1) and 266 g P ha(-1) for Iv; 623 g N ha(-1) and 192 g P ha(-1) for Ic) than did the Ic pattern. However, at 70 min, no significant differences in total losses were evident for TKN or TKP from either rainfall intensity pattern. In contrast, total cumulative losses of dissolved reactive P (DRP) and NO3-N were greatest for ST-Ic, followed by ST-Iv, CT-Ic, and CT-Iv in diminishing order (69 g DRP ha(-1) and 361 g NO3-N ha(-1); 37 g DRP ha(-1) and 133 g NO3-N ha(-1); 3 g DRP ha(-1) and 58 g NO3-N ha(-1); 1 g DRP ha(-1) and 49 g NO3-N ha(-1)). Results indicate that constant-rate rainfall simulations may overestimate the amount of dissolved nutrients lost to the environment in overland flow from cropping systems in loamy sand soils. We also found that CT treatments lost significantly greater amounts of TKN and TKP than ST treatments and in contrast, ST treatments lost significantly greater amounts of DRP and NO3-N than CT treatments. These results indicate that ST systems may be losing more soluble fractions than CT systems, but only a fraction the total N (33%) and total P (11%) lost through overland flow from CT systems.

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“…The Biscayne aquifer lies close to the surface, while the Upper and Lower Floridan aquifers lie below it. At present, water demand is met primarily from the Biscayne aquifer or from surface water bodies (such as Lake Okeechobee and the Water Conservation Areas) (Berndt et al, 1998). The Biscayne aquifer is a 'surficial aquifer', recharged primarily by rainfall, and is the primary source of potable water for Dade, Broward, and parts of Palm Beach and Monroe counties.…”

Section: Water Availability and Current Storage Capacitymentioning

confidence: 99%

The effect of limited options and policy interactions on water storage policy in South Florida

Mayer

2001

Journal of Environmental Management

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Water quality in the Georgia-Florida coastal plain, Georgia and Florida, 1992-96

Cited by 23 publications

References 1 publication

Past, Present, and Future Nutrient Quality of a Small Southeastern River: A Pre-Dam Assessment

Past, Present, and Future Nutrient Quality of a Small Southeastern River: A Pre-Dam Assessment

Nitrogen and Phosphorus Runoff Losses from Variable and Constant Intensity Rainfall Simulations on Loamy Sand under Conventional and Strip Tillage Systems

The effect of limited options and policy interactions on water storage policy in South Florida

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