2007
DOI: 10.3133/sir20075237
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Evaluation of Approaches for Managing Nitrate Loading from On-Site Wastewater Systems near La Pine, Oregon

Abstract: Plate 1. Selected cross sections showing lithologic units of the La Pine region, Oregon …………………………………………………………………… [In pocket] *Transmissivity: The standard unit for transmissivity is cubic foot per day per square foot times foot of aquifer thickness [(ft 3 /d)/ft 2 ]ft. In this report, the mathematically reduced form, foot squared per day (ft 2 /d), is used for convenience. Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) or micrograms per liter (µg/L). Datums V… Show more

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Cited by 11 publications
(4 citation statements)
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“…Annual per capita N loading rates to groundwater at the LT and YG sites are lower than other estimates of 4.5 kg N yr −1 (Cox and Kahle, 1999), which would yield 9 and 13.5 kg N yr −1 for households with two and three people, respectively. Based on septic tank studies in central Florida (Sherman and Anderson, 1991) and Oregon (Morgan et al, 2007), about 9.5 to 9.7 kg N yr −1 per home are released to the drainfield, and it is estimated that an additional 25% reduction in N occurs beneath the drainfield (Anderson et al, 1994; Morgan et al, 2007). The annual N loading for the HK site (6.6–12 kg N yr −1 ) also is lower than the estimated loading to groundwater of 18 kg N yr −1 based on per capita N loading (Anderson et al, 1994; Cox and Kahle, 1999).…”
Section: Resultsmentioning
confidence: 99%
“…Annual per capita N loading rates to groundwater at the LT and YG sites are lower than other estimates of 4.5 kg N yr −1 (Cox and Kahle, 1999), which would yield 9 and 13.5 kg N yr −1 for households with two and three people, respectively. Based on septic tank studies in central Florida (Sherman and Anderson, 1991) and Oregon (Morgan et al, 2007), about 9.5 to 9.7 kg N yr −1 per home are released to the drainfield, and it is estimated that an additional 25% reduction in N occurs beneath the drainfield (Anderson et al, 1994; Morgan et al, 2007). The annual N loading for the HK site (6.6–12 kg N yr −1 ) also is lower than the estimated loading to groundwater of 18 kg N yr −1 based on per capita N loading (Anderson et al, 1994; Cox and Kahle, 1999).…”
Section: Resultsmentioning
confidence: 99%
“…where: C PEN1 is a coefficient for adjusting Pen1 values to reach the order of magnitude of other penalty items in the total penalty function (see Equation (17); here, C PEN1 = 1,000,000); N adW is the number of AWs (nominal); X j and Y j are the abscissa (number of column in the 80 × 80 Modflow top view grid) and the ordinate (number of rows in the Modflow grid) of AW j (j = 3, 4), respectively (nominal); maxX and maxY are the max physical values of X j and Υ j , respectively (nominal). C4: The EWs (W 1 , W 2 ) must not pump pollution during the study period of 300 d. Thus, the pollutant concentration in the respective cell must remain equal to zero.…”
Section: Constraint Handlingmentioning
confidence: 99%
“…It is assumed that aerobic conditions apply in the aquifer, with dissolved oxygen concentrations DOC > 0.5 mg/L (oxic groundwater; similar to [17]), which do not favor the denitrification process (as described in [18,19]).…”
mentioning
confidence: 99%
“…Seven landscape-scale variables that describe the hydrogeologic and landscape settings of the springs and that may influence spring discharge type, discharge amount, and water chemistry were derived from other spatial datasets and summarized for each spring. These Gannett, 1984;Gonthier, 1985 Early Tertiary volcanic, volcaniclastic, and volcanic sediment deposits of the Clarno and John Day Formations 5-140 0.003-0.3 Low Gannett, 1984;Gonthier, 1985 Basalt flows of the Miocene Columbia River Basalt Group 5-900 0.3-40 Medium Ely et al, 2014;Gannett, 1984;Gonthier, 1985;Vaccaro et al, 2015 Quaternary surficial deposits 9-1,400 8-46 Medium Gannett, 1984;Gonthier, 1985;Morgan, Hinkle, & Weick, 2007 Late Tertiary volcanic, volcaniclastic, and volcanic sediment deposits of the Deschutes Formation (and their age equivalents) 20-23,000 3-680 High Gannett et al, 2001;Gannett, Lite, Risley, Pischel, & La Marche, 2017;Gonthier, 1985 Quaternary volcanic deposits of the Cascade Range and Newberry Volcano 50-74,000 1-300 High Gannett et al, 2001Gannett et al, , 2017Gates & Gannett, 1996;Manga, 1997, Saar & Manga, 2004 Note. Transmissivity and hydraulic conductivity values were estimated in the cited sources using a variety of methods including analysis of specific capacity data from well logs, published aquifer tests, and model analysis.…”
Section: Landscape Variablesmentioning
confidence: 99%