A hydrologic model which simulates the movement and occurrence of water in and on top of the ground.
- Browse Related Terms: Aerial cover, ASTS, Conjunctive use, Consolidation grouting, Corduroy, Effluent Seepage, Frost line, Geohydrology, Ground Water Overdraft, Harrow, Hydrogeochemistry, Hydrogeologist, Hydrogeology, Initial Detention, Offstream uses, Peak ground acceleration (PGA), Sacramento Soil Moisture Accounting Model (SACSMA), Scrape, Seashore, Snow Depth, Sprinkler irrigation, Terrain, Usable storage capacity, Withdrawal, Yield
Any specific, discrete, narrowly delineated location on Federal land that is identified by an Indian Tribe, or Indian individual determined to be an appropriately authoritative representative of an Indian religion, as sacred.
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A subsidiary dam of any type constructed across a saddle or low point on the perimeter of a reservoir. See dike.
- Browse Related Terms: BCD, Camber, DD, Dike, Diversion capacity, Downstream face, Earth Dam or Earthfill Dam, Flood Wave, Fluctuating flows, Gabion dam, Hydraulic fill structure, Impoundment, Irrigation check, Overtopping, Pond, Rolled Earth Dam, Saddle dam, Seepage collar, Tailings dam., Toe Drain (or Outfall), Toe of Dam, Toe of Dam (Upstream and Downstream), Top of dam., Upstream face
Passed in 1974, SDWA is the main federal law that ensures the quality of Americans' drinking water. See Safe Drinking Water Act of 1974.
- Browse Related Terms: AAC, ACGIH, AIPC, AIRFA, AISC, ANSI, ARWRI, ASCE, ASCII, ASSE, Avoirdupois weight, AWWA, Bureau of Indian Affairs (BIA), Safe Drinking Water Act (SDWA), Tribe, United States
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The annual quantity of water that can be taken from a source of supply over a period of years without depleting the source beyond its ability to be replenished naturally in wet years.
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The earthquake expressed in terms of magnitude and closest distance from the damsite or in terms of the characteristics of the time history of free-field ground motions for which the safety of the dam and critical structures associated with the dam are to be evaluated. In many cases, this earthquake will be the maximum credible earthquake to which the dam will be exposed. However, in other cases where the possible sources of ground motion are not easily apparent, it may be a motion with prescribed characteristics selected on the basis of a probabilistic assessment of the ground motions that may occur in the vicinity of the dam. To be considered safe, it should be demonstrated that the dam can withstand this level of earthquake shaking without release of water from the reservoir.
- Browse Related Terms: Capable fault, DBE, Design basis earthquake (DBE), Design response spectra, Earthquake, Maximum credible earthquake (MCE), Maximum design earthquake (MDE), Operating basis earthquake (OBE), Safety Evaluation Earthquake (SEE), Seismic evaluation criteria, Soil classification, Synthetic earthquake
The largest flood for which the safety of a dam and appurtenant structure(s) are to be evaluated.
- Browse Related Terms: Deficiency Verification Analysis (DVA), DVA, Modification Decision Analysis (MDA), Overall safety of dams classification, Potential dam safety deficiency, Safety evaluation flood (SEF), Safety Evaluation of Existing Dams (SEED) report
The onsite examination performed initially and at predetermined intervals (approximately every 6 years). The design, construction, operation, performance, and existing condition of all features are evaluated in accordance with state-of-the-art criteria. See overall safety of dams classification.
- Browse Related Terms: Annual inspection (AI), Certified water right, Comprehensive Facility Review (CFR), Evaluation report (Report for Examination No. 1, first formal examination), Examination report, Exit conference, Initial SEED examination, Intermediate SEED examination, Major facility, Ongoing Visual Inspection (OVI), Periodic Facility Review (PFR), Safety Evaluation of Existing Dams (SEED) examination, Special examination
A compilation of independent technical reports that evaluate the design, construction, and performance of a dam for its structural and hydraulic integrity using available data; identify existing or potential dam safety deficiencies; and recommend future actions appropriate for the safety of the dam. Evaluation includes review of hydrology, geology, seismicity, seepage, structural adequacy, design criteria, construction, operation, instrumentation records, existing field conditions, and past performance. See evaluation report. See overall safety of dams classification.
- Browse Related Terms: Deficiency Verification Analysis (DVA), DVA, Modification Decision Analysis (MDA), Overall safety of dams classification, Potential dam safety deficiency, Safety evaluation flood (SEF), Safety Evaluation of Existing Dams (SEED) report
The condition of containing dissolved or soluble salts. Saline soils are those whose productivity is impaired by high soluble salt content. Saline water is that which would impair production if used to irrigate sensitive crops without adequate leaching to prevent soil salinization.
- Browse Related Terms: Available capacity, Drip irrigation (trickle), Field (Moisture) Capacity, Halophytic, Permanent wilting point (permanent wilting percentage), Potential evapotranspiration, saline, Saline sodic land, Topsoil, Wilting point
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Soil that contains soluble salts in amounts that impair plant growth but not an excess of exchangeable sodium.
- Browse Related Terms: Available capacity, Drip irrigation (trickle), Field (Moisture) Capacity, Halophytic, Permanent wilting point (permanent wilting percentage), Potential evapotranspiration, saline, Saline sodic land, Topsoil, Wilting point
Water that contains more than 1,000 milligrams per liter of dissolved solids.
- Browse Related Terms: Biosphere, Black water, Cavitation damage, Condensation, DEW, Dew point, freshwater, Plasticity index, Pressure Gage, Raffinate ponds, Saline water, Total dissolved solids (TDS), Turbidimeter
Saltiness. The relative concentration of dissolved salts, usually sodium chloride, in a given water supply. A measure of the concentration of dissolved mineral substances in water.
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Family of fish that includes salmon and steelhead.
- Browse Related Terms: AFRP, Alevin, Anadromous, Angler-day, Cold-water fishery, Fish weir, Forage fish, Hatchery, ichthyology, Juvenile, Nonconsumptive water uses, Rough fish, Salmonids, Spawn, Warm-water fishery, Wetlands, Wildlife Refuge, Young-of-year
The movement of sand or fine sediment by short jumps above a streambed under the influence of a water current too weak to keep it permanently suspended in the moving water.
- Browse Related Terms: Aquiclude, Aquifuge, Current (I), Ground Water Hydrology, Hydrologic Cycle, Lysimeter, Percolation, Percolation Rate, Saltation
Random variation reflecting the inherent variability within a population being counted.
- Browse Related Terms: Ecological Resilience, Large Marine Ecosystems, local government, Sample error, Seismotectonic Province, Territorial communities, Urban area
Mineral grains whose particle size vary from a No. 4 sieve to a No. 200 sieve. A loose soil composed of particles between 1/16 mm and 2 mm in diameter.
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Material which has a particle size which varies from a No. 4 sieve to a No. 200 sieve and is used for refilling an excavation.
- Browse Related Terms: Backfill, Backfill concrete, Borrow, Borrow areas, Borrow pits, Cutoff Trench, Cutoff trench (keyway), Dam foundation, Embankment Dam (Fill Dam), Embankment dam or fill dam, Exploit, Fill Dam, Payline, Pipe trench, Pit run gravel, Refill, Sand backfill, Select material, Slurry trench, Uncompacted backfill, Unsuitable material, Wastebank
Seepage characterized by a boiling action at the surface surrounded by a cone of material from deposition of foundation and/or embankment material carried by the seepage. A swirling upheaval of sand or soil on the surface of or downstream from an embankment caused by water leaking through the embankment. The ejection of sand and water resulting from piping.
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