WHATCOM COUNTY LID CODE INTEGRATION PROJECT WCC (DEFINITIONS)
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1 Chapter DEFINITIONS Sections: Best management practice (BMP) Hard surface Hazard tree Impervious surface Land disturbing activity Low impact development (LID) LID best management practices (BMPs) Net land area disturbed Net new impervious surface area Net new permeable pavement areas Net replaced impervious surface area Net replaced permeable pavement areas Replaced hard surface Replaced impervious surface Replaced impervious surface area Replaced permeable pavement area Significant tree Stormwater Stormwater runoff Tree, significant Best management practice (BMP). Best management practice (BMP) means the schedule of activities, prohibitions of practices, maintenance procedures, and structural and/or managerial practices approved by Washington State Department of Ecology that, when used singly or in combination, prevent or reduce the release of pollutants and other adverse impacts to waters of Washington State. 1 PAGE PLANNING COMMISSION RECOMMENDATION AUGUST 11, 2016
2 Hard surface. Hard surface means an impervious surface, a permeable pavement, or a vegetated roof Hazard tree. Hazard tree means any tree that is susceptible to immediate fall due to its condition (damaged, diseased, or dead) or other factors, and which because of its location is at risk of damaging permanent physical improvements to property or causing personal injury Impervious surface. Impervious surface means a hard surfacenon-vegetated surface area which either prevents or retards the entry of water into the soil mantle as under natural conditions prior to development, and/or a,. A nonvegetated surface area and/or a hard surface area which causes water to run off the surface in greater quantities or at an increased rate of flow from the flow present under natural conditions prior to development. Common impervious surfaces include, but are not limited to, roof tops, walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel roads, packed earthen materials, and oiled macadam or other surfaces which similarly impede the natural infiltration of stormwater. Natural surface waters and oopen, uncovered detention/retention facilities shall not be considered as impervious surfaces for purposes of determining whether the thresholds for application of minimum requirements are exceeded. Open, uncovered retention/detention facilities shall be considered impervious surfaces for purposes of runoff modeling.calculated when determining total impervious surfaces. Alternative surface methods as set forth in WCC shall not be considered impervious surfaces Land disturbing activity. Land disturbing activity means activity that results in a movement of earth or a change in the existing soil cover (both vegetative and nonvegetative) and/or the existing soil topography. Land disturbing activities include but are not limited to clearing, grading, filling, and excavation. Compaction that is associated with stabilization of structures and road construction shall also be considered a land disturbing activity. Vegetation maintenance practices are not considered land-disturbing activity. Stormwater facility maintenance is not considered land disturbing activity if conducted according to established standards and procedures Low impact development (LID). A stormwater and land use management strategy that strives to mimic pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration by emphasizing conservation, use of on-site natural features, site planning, and distributed stormwater management practices that are integrated into a project design. 2 PAGE PLANNING COMMISSION RECOMMENDATION AUGUST 11, 2016
3 LID best management practices (BMPs). Distributed stormwater management practices, integrated into a project design, that emphasize pre-disturbance hydrologic processes of infiltration, filtration, storage, evaporation and transpiration. LID BMPs include, but are not limited to, bioretention, rain gardens, permeable pavements, roof downspout controls, dispersion, soil quality and depth, minimal excavation foundations, vegetated roofs, and water re-use Net land area disturbed. Net land area disturbed means the quantity of disturbed native vegetated land area minus the quantity of any non-native vegetated land area Net new impervious surface area. Net new impervious surface area means the quantity of new minus the quantity of any existing impervious surface area Net new permeable pavement areas. Net new permeable pavement areas means the quantity of new permeable pavement area minus the quantity of any existing permeable pavement area Net replaced impervious surface area. Net replaced impervious surface area means the quantity of replaced impervious surface area minus the quantity of any existing impervious surface area Net replaced permeable pavement areas. Net replaced permeable pavement areas means the quantity of replaced permeable pavement area minus the quantity of any existing permeable pavement area Replaced hard surface. Replaced hard surface means, for structures, the removal and replacement of hard surfaces down to the foundation;. ffor other hard surfaces, the removal down to bare soil or base course and replacement Replaced impervious surface. Replaced impervious surface means, for structures, the removal and replacement of impervious surfaces down to the foundation;. Ffor other impervious surfaces, the removal down to bare soil or base course and replacement. (From 2012 DOE Stormwater Manual) Replaced impervious surface area. Replaced impervious surface area means, for structures, the removal and replacement of impervious surfaces down to the foundation. For other impervious surfaces, the removal down to bare soil or base course and replacement. 3 PAGE PLANNING COMMISSION RECOMMENDATION AUGUST 11, 2016
4 Replaced permeable pavement area. Replaced permeable pavement area means the removal and replacement of permeable pavement areas down to bare soil or base course and replacement Significant tree. See WCC Tree, significant Stormwater. Stormwater means that portion of precipitation that does not naturally percolate into the ground or evaporate, but flows via overland flow, interflow, pipes and other features of a stormwater drainage system into a defined surface waterbody, or a constructed infiltration facility.means the portion of precipitation that does not evaporate or naturally percolate into the ground, but flows or is disposed of via one or more of the following means: Surface or overland flow; Interflow; Infiltration; Evaporation; Pipes and other features of a stormwater drainage system; Into one or more of the following: Defined surface waterbodies (e.g., rivers, streams, creeks, sloughs, ponds, lakes); Subsurface water bodies; Springs; Seeps; Wetland; Constructed infiltration facilities Stormwater runoff. Stormwater runoff means the portion of precipitation that does not evaporate or naturally percolate into the ground, but flows via one or more of the following means: Surface or overland flow; Interflow; Shallow ground water; Pipes and other features of a stormwater drainage system; Into one or more of the following: Defined surface waterbodies (e.g., rivers, streams, creeks, sloughs, ponds, lakes); Springs; Seeps; Wetlands. 4 PAGE PLANNING COMMISSION RECOMMENDATION AUGUST 11, 2016
5 Tree, significant. Any evergreen tree, twelve inches or greater in diameter at breast height (DBH) or deciduous tree, eight inches or greater DBH. Diameter at breast height shall be measured four and one half feet above existing grade. The Director of Planning and Development Services may authorize the exclusion of any tree, which for reasons of health or age is not desirable to retain, from this definition. I:\Planning Division\Long Range Planning\NPDES Phase II\LID Code Development\Planning Commission\ Meeting Materials\ Definitions - PC adopted.docx 5 PAGE PLANNING COMMISSION RECOMMENDATION AUGUST 11, 2016
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