Scientific Investigations Report 2007–5237
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5237
Table 7. Summary of model simulation results for eight on-site wastewater management scenarios tested with the study-area model in the La Pine, Oregon, study area.
[Acres are based on simulated nitrate concentrations in the uppermost active (saturated) model cells. Equilibrium acreages are based on simulated nitrate concentrations at end of simulation (2139). Peak acreages are based on simulated nitrate concentrations in the year when the highest concentrations occur for each scenario. Abbreviations: TDC, transferable development credit; mg N/L, milligram nitrogen per liter; lb/yr, pound per year; mg/L, milligram per liter; Symbol: –, no data]
| Scenario | Effluent recharge concentration (mg N/L) |
TDC | Equilibrium | Peak | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Equilibrium nitrate loading(lb/yr) | Reduction in loading from scenario 1 (percent) | Acres greater than 10 mg/L at equilibrium | Reduction from scenario 1(percent) | Acres greater than 10 mg/L at peak | Reduction from scenario 1(percent) | Peak concentration year | ||||
| 1 | 46 | No | 147,000 | – | 9,398 | – | 9,398 | – | 2139 | |
| 2 | 46 | Yes | 125,000 | 15 | 7,317 | 22 | 7,317 | 22 | 2139 | |
| 3 | 20 | No | 65,300 | 56 | 1,909 | 80 | 1,944 | 79 | 2053 | |
| 4 | 20 | Yes | 55,900 | 62 | 1,433 | 85 | 1,456 | 85 | 2049 | |
| 5 | 10 | No | 34,200 | 77 | 700 | 93 | 1,233 | 87 | 2038 | |
| 6 | 10 | Yes | 29,500 | 80 | 619 | 93 | 1,153 | 88 | 2035 | |
| 7 | 2 | No | 9,200 | 94 | 115 | 99 | 975 | 90 | 2027 | |
| 8 | 2 | Yes | 8,300 | 94 | 109 | 99 | 975 | 90 | 2027 | |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5237
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