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There are 375 entries started with 'r'
R R- HORIZON R, r
Rm Rs ru
RA RABBLE ARMS RAC
RACE TRACK RACM RACT
RAD (Unit) RADIAL FLOW RADIAL WELL
RADIAN (rad) RADIANT INTENSITY (Unit) RADIATION
RADIATION BELTS RADIATION DAMAGE RADIATION INVERSION
RADIATION SICKNESS RADIATION SURVEY RADICAL
RADIOACTIVE RADIOACTIVE DECAY RADIOACTIVE ELEMENTS
RADIOACTIVE MATERIALS RADIOACTIVE NUCLEAR WASTE RADIOACTIVE SPRING
RADIOACTIVE WASTE RADIOACTIVE WASTE, CONTROLLED RADIOACTIVE WASTE, HIGH LEVEL
RADIOACTIVE WASTE, LOW LEVEL RADIOACTIVE WASTE, UNCONTROLLED RADIOACTIVITY
RADIOCARBON RADIOCARBON DATING RADIOISOTOPE
RADIOLOGICAL SURVEY RADIOLUMINESCENCE RADIONUCLIDE
RADIUM RADIUS OF INFLUENCE OF A WELL RADON
RADON DAUGHTERS RADON FAMILY RADON GAS
RADON PARENT RADWASTE RAFFINATE
RAFT FOUNDATION RAILWAY SOFTENING RAIN
RAIN- FED STREAM RAIN FOREST RAIN GAGE
RAIN MAKER RAIN PILLAR RAIN PRINT
RAIN-DAY RAINDROP RAINDROP SHAPE
RAINDROP SIZE RAINDROP SPEED RAINFALL
RAINFALL AREA RAINFALL DYNAMICS RAINFALL EXCESS
RAINFALL INDEX RAINFALL INFILTRATION RAINFALL PENETRATION
RAINFALL RATE RAINFALL-DISTRIBUTION COEFFICIENT RAINFALL-INTENSITY CURVE
RAINSTORM RAINWASH RAKER PILE
RAMP RAMS RANKINE'S THEORY
RAP RAPID (Soil Drainage) RAPID MIX
RAPID-SAND FILTER RAS RASP
RATE RATE CONSTANT (k) RATE LAW
RATE OF REACTION RATE-DETERMINATING STEP RATE-OF-FLOW CONTROLLER
RATING RATIO RAVINE (Landform)
RAW SLUDGE RAW WATER RAYLEIGH WAVES
RBE RCC RCRA
RCRIS RD/RA RDF
REACTANT(S) REACTION RATE REACTIVATION
REACTIVE WALL REACTIVE WASTE REACTOR
REACTOR, NUCLEAR REAERATION REAGENT
REAGENT GRADE WATER REAL DENSITY REAL SPECIFIC GRAVITY
REAUMUR REBOILER RECALCINING
RECARBONATION RECENT SOIL RECESSIONAL MORAINE
RECHARGE RECHARGE BASIN RECHARGE GROUNDWATER
RECHARGE WELL RECIRCULATION RATIO (Biological Filters) RECLAIMED WASTEWATER
RECLAMATION RECLAMATION LAND RECLAMATION, MINING
RECORD OF DECISION RECOVERABLE RECOVERY CYCLE
RECYCLE RATIO RECYCLING RED ARSENIC
RED ARSENIC GLASS RED BAG WASTE RED CLAY
RED DESERT SOIL RED DOG RED LIST
RED MUD RED ORPIMENT RED PODZOLIC SOILS
RED WATER REDDISH CHESTNUT SOILS REDDISH PRAIRIE SOILS
REDDISH-BROWN SOILS REDOX POTENTIAL REDOX REACTION
REDUCING AGENT REDUCTANT REDUCTION
REDUCTION OF AREA REDUCTION-OXIDATION POTENTIAL REDUCTION-OXIDATION REACTION
REED BED REEF REFLECTED WAVE
REFLECTION REFORESTATION REFRACTED WAVE
REFRACTION REFRACTION COEFFICIENT REFRACTIVE INDEX (n)
REFRACTORY REFRACTORY ORGANICS REFRIGERANT
REFUSE REFUSE DERIVED FUEL (RDF) REGELATION
REGENERANT REGENERATE REGENERATIVE THERMAL OXIDIZER (RTO)
REGIONAL METAMORPHISM REGOLITH REGOSOLS
REJECT REJECT STAGING RELATIVE ACCURACY TEST AUDIT (RATA)
RELATIVE BIOLOGICAL EFFECT (RBE) RELATIVE CONSISTENCY (Ic, Cr) RELATIVE DENSITY (Dd)
RELATIVE DIELECTRIC CONSTANT RELATIVE HUMIDITY RELATIVE RISK
RELATIVE VELOCITY RELATIVE WATER CONTENT RELAXATION
RELAXATION TIME RELEASE RELIEF (Landform)
RELIEF SEWER REM (rem) (Unit) REMEDIAL ACTION
REMEDIAL INVESTIGATION/FEASIBILITY STUDY (RI/FS) REMEDIATION REMEDIATION CONTROL SURVEY
REMEDY REMOLDED SOIL REMOLDING INDEX, (RI, IR)
REMOLDING SENSITIVITY REMOVABLE ACTIVITY REMOVAL
RENDZINA SOILS RENEWABLE RESOURCE REPLACEMENT (Geology)
REPORTABLE QUANTITY REPRESENTATIVE SAMPLE REPULSIVE ENERGY
REPULSIVE FORCE RESERVOIR RESIDUAL COHESION
RESIDUAL FRICTION ANGLE RESIDUAL MATERIAL RESIDUAL RADIOACTIVITY
RESIDUAL SHEAR STRENGTH RESIDUAL SHRINKAGE RESIDUAL SOIL
RESIDUAL STRENGTH COEFFICIENT ( r) RESIDUAL STRESS RESIDUAL WASTE
RESIDUE RESILIENCE RESILIENCE, MODULUS OF
RESIN RESIN BEADS RESISTING FORCES
RESISTIVITY RESONANCE RESOURCE CONSERVATION
RESOURCE CONSERVATION AND RECOVERY ACT (ACRA) RESOURCE RECOVERY RESOURCES
RESPIRATION RESPIRATORY SYSTEM, HUMAN RESPONSE TRUST FUND
RESTORATION RESTRICTED USE RESURGENT WATER
RETAINING WALL RETARDING BASIN RETENSION, WATER
RETENTION RETENTION POND RETENTION TIME
RETICULATED MINI-PILE WALLS RETROGRADE SOLUBILITY RETURN ACTIVATED SLUDGE (RAS)
RETURN FLOW RETURN SEEPAGE RETURN SLUDGE
RETURN WATER REVERSE OSMOSIS REVERSE HEAD
REVERSED STREAM REVETMENT REVETMENT WALL
REYNOLDS' CRITICAL VELOCITY REYNOLDS' NUMBER (R) RF/AS
RFA RHA RHEOLOGY
RHIZOSPHERE RHYOLITE RI/FS
RIA RIBONUCLEIC ACID (RNA) RICE HUSK (Material)
RICE HUSK ASH (Material) RICE HUSK CEMENT RICHTER EARTHQUAKE MAGNITUDE SCALE
RIDGE RIDGING RIFFLE
RIGHT-HAND RULE RIGID BODY RIGID PAVEMENT
RIGID PLASTIC RIGID PLASTIC MATERIAL RIGIDITY
RILL RIME RING OF FIRE
RIP RIP CURRENT RIPARIAN LAND
RIPARIAN RIGHTS RIPARIAN RIGHTS, WATER LAW RIPPABLE EXCAVATION
RIPPLE MARKS RIPRAP RISE RATE
RISING FILM EVAPORATOR RISK ASSESSMENT RIVER DEPOSITS
RIVERINE ENVIRONMENT RIVERS RMCLs
RNA ROAD OIL ROADCHEM
ROCK ROCK AVALANCHE ROCK BOLTS
ROCK CLASSIFICATION ROCK CLASSIFICATION, BASED ON GEOLOGICAL OR LITHOLOGICAL SYSTEMS ROCK CLASSIFICATION, BASED ON ORIGIN AND GENESIS
ROCK CLASSIFICATION, BASED ON STRENGTH OF ROCK MASS ROCK CLASSIFICATION, FOREST SERVICE ROCK CRYSTAL
ROCK CYCLE ROCK FALL ROCK FLOUR
ROCK FLOW ROCK FORMATION ROCK MECHANICS
ROCK SALT ROCK SLIDE ROCK-FILL DAM
ROCK-FORMING MINERALS ROCK-QUALITY DESIGNATION (RQD) ROCK-UNIT
ROCKWELL HARDNESS ROGUE WAVE ROLLING LAND
ROOF ROCK ROOT ROOT CONTROL
ROOT PILE (Foundation) ROOT ZONE ROOT-TREE INTERACTION
ROSIN AND REMMLER'S LAW OF CRUSHING (Geology) ROTARY COLLECTOR ROTARY DISTRIBUTOR
ROTARY DRUM SCREEN ROTARY DRUM THICKENER ROTARY KILN INCINERATOR
ROTATING BIOLOGICAL CONTACTOR (RBC) ROTATIONAL LANDSLIDE ROTIFER
ROTOR ROUGHING FILTER RPM (rpm)
RTECS RTO RTR
RUBBER RUBBER TIRE RUBBER TIRE AGGREGATE
RUBBER TIRE, SCRAP RUBBER TIRE, WASTE RUBBER, SYNTHETIC
RUBBER-LIKE MATERIAL RUBBISH RUBBLE
RUBBLE DAM RUBBLE DRIFT RUNOFF
RUNOFF PERCENTAGE RUNOFF RATE RUNOFF VOLUME
RUNOFF COEFFICIENT RUNOFF DRAINAGE RUN-ON
RUPTURE RUPTURE ENVELOPE RUPTURE LINE
RUT DEPTH (Pavement) RUT DEPTH INDICATOR (Pavement) RYZNAR INDEX




ENVIRONMENTAL GEOTECHNOLOGY DICTIONARY
Edited By
Hsai-Yang Fang, Ph.D
Professor Emeritus
Lehigh University. Bethlehem, PA
Distinguished Fellow
Global Institute for Energy & Environmental Systems
The University of North Carolina at Charlotte, Charlotte, NC

Copyright Reserved 2006

Environmental geotechnology is a relatively new and interdisciplinary subject, which covers soil, water and rock and their interaction with various environmental cycles including the atmosphere, biosphere, hydrosphere, lithosphere, as well as geomicrobiosphere. To tackle this complex subject, it is necessary to have knowledge from other disciplinary fields including agricultural science, biology, environmental science, geology, microbiology, mineralogy, and physicochemistry. Therefore, a uniform glossary of terms, definitions, nomenclature, abbreviation, acronym, symbols and units is needed for general discussions, reports and documents to minimize confusion and to improve the effectiveness for the environmental aspects of geotechnical problems. Some important information is collected, compiled and edited, and in spite of careful preparation of this dictionary, there cannot be avoided some missing or misinterpreted terms, typing errors, etc. The editor hopes, however, that with the aid of suggestions and criticism, there can be improvement for a later edition.
Thanks to many government agencies, professional societies and private organizations including American Society of Civil Engineers (ASCE), American Society for Testing and Materials (ASTM), Transportation Research Board (TRB), International Society of Environmental Geotechnology (ISEG), U.S. Environmental Protection Agency (EPA), U.S. Department of Energy (DOE) for providing useful documents for preparation of the dictionary. Also thanks to Prof. Charles Ochola, Villanova University, Prof. Tae-Hyung Kim, Korea Maritime University, Ms. Eleanor S. Nothelfer of Fritz Engineering Laboratory, Lehigh University and Mr. Gustavo Borel Menezes of Global Institute for Energy and Environmental Systems (GIEES), University of North Carolina at Charlotte for their assistance during various phases of preparation of the manuscript.
Acknowledgment is made to Review Committee Members for their time and willingness to review the manuscripts.

Prof. Ronald C. Chaney, Humboldt State University, Arcata, CA
Prof. John L. Daniels, The University of North Carolina at Charlotte, NC
Prof. Jeffrey C. Evans, Bucknell University, Lewisburg, PA
Prof. T. Cassia De Brito Galvao, Universidade Federal de Minas Gerais, BRAZIL
Prof. Hilary I. Inyang, The University of North Carolina at Charlotte, NC
Dr. Abidin Kaya, URS Corporation, Honolulu, HI
Prof. Jai-Young Lee, The University of Seoul, KOREA
Prof. Irene M.C. Lo, Hong Kong University of Science & Technology, Hong Kong
Prof. Horace K. Moo-Young Jr., Villanova University, PA
Dr. Jouko Saarela, Finnish Environmental Institute, FINLAND
Prof. Robert W. Sarsby, The University of Wolverhampton, U.K.
Prof. Leonardo Zeevaert, Universidad Nacional Automoma de Mexico, MEXICO
Prof. Thomas F. Zimmie, Rensselaer Polytechnic Institute, NY

Hsai-Yang Fang
February 15, 2006

Web Edition by:
Gustavo Borel Menezes, GIEES, UNC Charlotte
Simon Chung, GIEES, UNC Charlotte

Developed by: Gustavo Borel Menezes