- Igneous intrusion that squeezes between sedimentary layers and domes the overlying layers.
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- Lake or reservoir wetland habitat.
- Browse Related Terms: Chironomid, Fry, Gametes, Lacustrine habitat, Larval fish, Limnological conditions, Palustrine habitat, Simulid
The measure of the time between the center of mass of precipitation to the center of mass of runoff (on the hydrograph); basin lag is a function of not only basin characteristics, but also of storm intensity and movement. Some hydrologic texts define lag from the center of mass of rainfall to the hydrograph peak.
- Browse Related Terms: Basin Lag, Excess Rain, Flash Flood Guidance (FFG), HDRAIN, Hyetograph, Isohyet, Lag (of a basin), Parametric Data, response time
The time it takes a flood wave to move downstream.
- Browse Related Terms: attenuation, Bed elevation, Dispersion, Flood Crest, Height of dam., Lag (Time), Maximum wave, Significant wave height, Staff gauge, Structural Height, Wave runup
- In tunneling, planking placed against the dirt or rock walls and ceiling, outside the ribs.
- Browse Related Terms: BLAST, Blasting mats, Chipping, Coyote holes, Lagging, Loose yards, Mixed face, Muck, Overbreak, Quarry
- The order of mammals including rabbits, hares, and pikas.
- Browse Related Terms: Breeding rate, Coastal Waters, District, Lagomorphs, Meander Belt, Oil, On-district storage, Population
Streamline flow in which successive flow particles follow similar path lines and head loss varies with velocity to the first power.
- Flow in which the head loss is proportional to the first power of the velocity. The flow field can be characterized by layers of fluid, one layer not mixing with adjacent ones. The flow is laminar or turbulent depending on the value of the Reynolds number, which is a dimensionless ratio of the inertial forces to the viscous forces. In laminar flow, viscous forces are dominant and the Reynolds number is relatively small. In turbulent flow, the inertial forces are very much greater than the viscous forces and the Reynolds number is large. Laminar flow occurs very infrequently in open channel flow.
- Browse Related Terms: Acceleration, Flood severity, Flow line, Flow net, Hydrograph, Laminar Flow, Stream line, Turbulent flow, Velocity
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- Reclamation's systematic placing of lands into classes based on their suitability for sustained irrigated farming. Land classes are defined by productivity, with Class 1 being the most productive. For other classes, the equivalent acreage to Class 1 for the same productivity is defined (Class 1 equivalency). For example, (the productivity of) X acres of Class 2 land is equal to (the productivity of) 1 acre of Class 1 land.
- Browse Related Terms: arid, Deed covenant, Excess land, Exempt land, Irrigable acreage for service (irrigable area for service), Irrigation district, Land classification, Landholder, Reclamation Reform Act of 1982 (RRA), Temporary irrigation service land
- Land held in title.
- Browse Related Terms: Coastal Flooding, Corridor, Easement, Environmental analysis, Fallow, Flowage, Flowage easement, Geomorphology, Irrigation, Land ownership, Land retirement, Marginal land, Marine Environment, Multiple use, National Monument, National Parks, Plot, Public land order, Right of way, River corridor, Rural area, Sacred site, Soil conservation, Wilderness
- Permanent removal of land from agricultural production.
- Browse Related Terms: Coastal Flooding, Corridor, Easement, Environmental analysis, Fallow, Flowage, Flowage easement, Geomorphology, Irrigation, Land ownership, Land retirement, Marginal land, Marine Environment, Multiple use, National Monument, National Parks, Plot, Public land order, Right of way, River corridor, Rural area, Sacred site, Soil conservation, Wilderness
- An open area where trash is buried. Facility in which solid waste from municipal and/or industrial sources is disposed; sanitary landfills are those that are operated in accordance with environmental protection standards.
- Browse Related Terms: Dam tender, Earthwork, essential element, Gated spillway, Incident command system, Landfill, Logbook (operating log), Maintenance management system, OML, Posted operating instructions, Remote operation, Reservoir regulation (or operating) procedure, Review of Operation and Maintenance (RO&M), Standing Operating Procedures (SOP), Supervisory control
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- A landholder is an individual or legal entity owning or leasing land subject to the acreage limitation provisions.
- Browse Related Terms: arid, Deed covenant, Excess land, Exempt land, Irrigable acreage for service (irrigable area for service), Irrigation district, Land classification, Landholder, Reclamation Reform Act of 1982 (RRA), Temporary irrigation service land
- The failure of a sloped bank of soil or rock in which the movement of the mass takes place along a surface of sliding.
- Browse Related Terms: Allowable bearing capacity, Arching, At-rest earth pressure, Capillary Potential, Coefficient of consolidation, Effective force, Flow failure, Flow slide, Foundation material (foundation soil), Foundation surface, Internal vibration, Landslide, Peat, Pore pressure, Shear zone, Slough, Ultimate bearing capacity, Void
An electronic device that interfaces a river or precipitation gage with a telephone line making it possible for remote computers to call a gaging site and retrieve data. Eventually LARCs will Replace DARDCs.
- Browse Related Terms: Area Wide Hydrologic Prediction System (AWHPS), Automated Tone Dial Telephone Data Collection System (ATDTDCS), base station, Basin runoff model, Centralized Automated Data Acquisition System (CADAS), Computer base station, Cooperative Observer, Data collection platform, Data Collection Platform (DCP), E-19a, Abridged Report on River Gage Station, File Transfer Protocol (FTP), GOES Data Collection System (DCS), Ground receive sites, Hydromet, Integrated Flood Observing and Warning System (IFLOWS), LARC (Limited Automatic Report Collector), Limited Automatic Remote Collector (LARC), National Environmental Satellite, Data, and Information Service (NESDIS), NWSRFS V5.0, or Version 5 (National Weather Service River Forecast Model Version 5), Stage II Precipitation Processing, Standard Hydrologic Exchange Format (SHEF)
Regions of ocean space encompassing coastal areas from the river basins and estuaries out to the seaward boundary and continental shelves and to the seaward margins of coastal current systems. They are relatively large regions on the order of 200,000 square kilometers or greater, characterized by distinct bathymetry, hydrography, productivity, and trophically dependent populations.
- Browse Related Terms: Ecological Resilience, Large Marine Ecosystems, local government, Sample error, Seismotectonic Province, Territorial communities, Urban area
- An immature stage that develops from the fertilized egg before assuming the characteristics of the adult.
- Browse Related Terms: Chironomid, Fry, Gametes, Lacustrine habitat, Larval fish, Limnological conditions, Palustrine habitat, Simulid
For purposes of national system natural heritage and cultural heritage MPAs, the site's authority must clearly state its intent to provide permanent protection. For national system sustainable production MPAs, the site must be established with the intent at the time of designation to provide, at a minimum, the duration of protection necessary to achieve the mandated long-term sustainable production objectives for which the site was established.
- Browse Related Terms: Avoid Harm, Ecological Network, Lasting, National System of MPAs, Network of MPAs, Prior appropriation, Protection, Refuge compatibility requirements, Reserved, Sustainable Production, Zoning
- A channel that conveys water from a canal to a farm, municipality, etc.
- Browse Related Terms: Canal, Channel (watercourse), Channelization, Conveyance loss (distribution loss), Ditch, Exit channel., Head Race, Inlet structure., Lateral, Turnout
- Ridge-like pile of sediment along the side of a glacier.
- Browse Related Terms: Alluvial fan, Alluvium, Bed material, Bed-material discharge, Contact load, Deposition, Detritus, Dredging, End moraine (terminal moraine), Lateral moraine, Sediment Storage Capacity, Sedimentation, Wash load
- Fluid, molten igneous rock erupted on the earth's surface.
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