West Virginia Code of State Rules › Agency 38 - Mining And Reclamation › Title 38 - LEGISLATIVE RULE DEPARTMENT OF ENVIRONMENTAL PROTECTION MINING AND RECLAMATION › Series 38-14 - Dam Control › Section 38-14-2 - Definitions

Current through Register Vol. XLI, No. 28, July 12, 2024
Unless the context in which used clearly requires a different
				  meaning, the definitions contained in
W.Va. Code
§ 20-50-3 shall apply to this rule in addition to those definitions set
				  forth below.
2.1 "Appurtenances" means
				any ancillary part of the dam and/or reservoir system which contributes to the
				operation or construction of the dam.
2.2 "Channel protection" means any measures
				taken to prevent or control erosion, cavitation, or other destructive the
				lowest point of the crest of the embankment of a dam and the reservoir water
				surface.
2.3 "Dangerous condition"
				means any structural, or hydraulic condition of a dam or its appurtenances
				which may lead to (1) failure of the dam and possible loss of human life or
				substantial loss of property, or (2) harm to the public health or welfare, or
				(3) significant harm to the environment.
2.4 "Design storm" means predicted
				precipitation of given intensity, frequency, and duration based on National
				Weather Service data,
2.5
				"Diversion ditch" means a designed channel constructed for the purpose of
				collecting and transmitting surface runoff resulting from a given design
				storm.
2.6 "Embankment" means a
				man-made deposit of earth or waste materials, usually exhibiting at least one
				sloping face.
2.7 "Emergency
				spillway" means a hydraulic structure designed to discharge water in excess of
				that which an impoundment is designed to store or which cannot be passed
				through a principal spillway.
2.8
				"Engineer" means a registered professional engineer in accordance with Article
				13, Chapter 30 of the Code of West Virginia, 1931, as amended (W.Va. State
				Registration Law for Professional Engineers.)
2.9 "Freeboard" means the vertical distance
				between the lowest point of the crest of the embankment of a dam and the
				reservoir water surface.
2.10
				"Geotechnical engineering" means the application of soil mechanics, rock
				mechanics, and geology to the solution of problems involving engineering
				structures and their interaction with surrounding earth materials.
2.11 "Hazard potential" means a
				classification rating assigned to a structure based on engineering evaluations
				and judgement for predicting the danger to human life, property and environment
				should a failure of the structure occur.
2.12 "Highway, primary" means those roadways
				which are designated as interstates, U.S. numbered highways or West Virginia
				numbered highways.
2.13 "Highway,
				secondary" means those roadways which are designated by the West Virginia
				Department of Highways as county numbered routes.
2.14 "Hydraulics" means the study of the
				physical behavior of liquids, especially water, in natural or man-made systems
				or -processes.
2.15 "Hydrologic
				analysis" means a determination, using accepted engineering methods, to
				establish surface water runoff for a specified design storm.
2.16 "Hydrology" means the science that deals
				with the occurrence and behavior of water in the atmosphere, on the ground and
				underground.
2.17 "Impoundment"
				means a basin constructed for the retention of water, sediment or
				waste.
2.18 "Natural drainway"
				means any natural water course which may carry water to the tributaries and
				rivers of the watershed.
2.19
				"P100" means the rainfall amount based on a 100 year" frequency, 6-hour,
				duration rainfall event.
2.20 "PMP"
				means the probable maximum precipitation.
2.21 "Principal spillway" means the hydraulic
				structure designed to discharge water stored between normal pool and the
				emergency spillway invert elevations.
2.21 "Probable maximum precipitation" means
				the depth-duration-area rainfall for a particular area that represents the
				maximizing of the most critical meteorological conditions that are considered
				possible of occurrence.
2.22
				"Safety factor" means the ratio of the available shear strength to the
				developed shear stress, or ratio of the sum of the resisting forces to the sum
				of the loading or driving forces, as determined by accepted engineering
				practices.
2.23 "Sediment" means
				solid material, either mineral or organic, resulting from the works of man that
				has been moved from its site of origin by water.
2.24 "Serious problem" means a situation,
				which left uncorrected, may lead to a dangerous condition,
2.25 "Site" means the actual or planned
				location of a dam including, but not limited to, appurtenant works, reservoirs
				area, diversion ditches, sediment control facilities, and borrow
				areas.
2.26 "Subsidence" means a
				sinking, collapsing or cracking of a portion of the earth's surface resulting
				from the presence of a void or voids beneath the surface.