As used in this chapter, the following terms shall have the meanings indicated:
BEST MANAGEMENT PRACTICE (BMP)Activities, facilities, designs, measures, or procedures used to manage stormwater impacts from regulated activities, to meet state water quality requirements, to promote groundwater recharge, and to otherwise meet the purposes of this chapter. Stormwater BMPs are commonly grouped into one of two broad categories or measures: "structural" or "nonstructural." In this chapter, nonstructural BMPs or measures refer to operational and/or behavior-related practices that attempt to minimize the contact of pollutants with stormwater runoff, whereas structural BMPs or measures are those that consist of a physical device or practice that is installed to capture and treat stormwater runoff. Structural BMPs include, but are not limited to, a wide variety of practices and devices, from large-scale retention ponds and constructed wetlands, to small-scale underground treatment systems, infiltration facilities, filter strips, low-impact design, bioretention, wet ponds, permeable paving, grassed swales, riparian or forested buffers, and filters, detention basins, and manufactured devices. Structural stormwater BMPs are permanent appurtenances to the project site.
CONSERVATION DISTRICTA conservation district, as defined in Section 3(c) of the Conservation District Law [3 P.S. § 851(c)] that has the authority under a delegation agreement executed with DEP to administer and enforce all or a portion of the regulations promulgated under 25 Pa. Code Chapter 102.
DEPThe Pennsylvania Department of Environmental Protection.
EARTH DISTURBANCE ACTIVITYA construction or other human activity which disturbs the surface of the land, including, but not limited to: clearing and grubbing; grading; excavations; embankments; road maintenance; building construction; and the moving, depositing, stockpiling, or storing of soil, rock, or earth materials. Earth disturbance activity is subject to regulation under 25 Pa. Code Chapters
92, 102, or the Clean Streams Law.
Borough of Ambridge, Beaver County, Pennsylvania.
NRCSUSDA Natural Resources Conservation Service (previously SCS).
REGULATED ACTIVITIESAny activities that may affect stormwater runoff and any activities that may contribute nonstormwater discharges to a regulated small MS4.
STATE WATER QUALITY REQUIREMENTSThe regulatory requirements to protect, maintain, reclaim, and restore water quality under Title 25 of the Pennsylvania Code and the Clean Streams Law.
STORM FREQUENCYDesign shall normally be based on a twenty-five-year storm frequency and shall be computed in accordance with DEP, Office of Water Management Erosion and Sediment Pollution Control Program Manual and/or PennDOT Design Manual Part 2, Highway Design, Publication 13M, latest editions.
STORMWATERDrainage runoff from the surface of the land resulting from precipitation or snow- or icemelt.
STORMWATER DRAINAGEThe maximum rate of postdevelopment stormwater runoff shall be less than or equal to the rate of predevelopment stormwater runoff.
USDAUnited States Department of Agriculture.
WATERS OF THIS COMMONWEALTHAny and all rivers, streams, creeks, rivulets, impoundments, ditches, watercourses, storm sewers, lakes, dammed water, wetlands, ponds, springs, and all other bodies or channels of conveyance of surface and underground water, or parts thereof, whether natural or artificial, within or on the boundaries of this commonwealth.