Definitions Additional Resources
Directly Connected Impervious Area: Any impervious surface Pre-project: The existing land use SLO Green Build SLO Guide Low Impact Development Interim Low Impact Development which drains into a catch basin, condition prior to a proposed http://www.slogreenbuild.org/Library/documents/ Guidelines area drain, or other conveyance development activity. general/20101117LIDguide.pdf structure without first allowing flow across pervious areas (e.g. Redevelopment: The creation, vegetated areas). addition, and/or replacement of City Of Santa Barbara Post-Construction Best impervious surface on an already Management Practice Manual Hydromodification: The developed site. Examples include alteration of hydrologic the expansion of a building characteristics and channel footprint, road widening, the http://www.santabarbaraca.gov/Resident/Community/ geometry within a watershed. addition to or replacement of a Creeks/Storm_Water_Management_Program.htm structure, and creation or addition Impervious Surface / Area: A of impervious surfaces. hard surface area which either Replacement of impervious Southern California Storm Water Coalition Southern prevents or reduces the entry of surfaces includes any activity that is California LID Guidance Manual water into the soil mantle. not part of a routine maintenance Common impervious surfaces activity where impervious materials http://www.casqa.org/LID/SoCalLID/tabid/218/ include, but are not limited to, roof are removed, exposing underlying tops, walkways, patios, driveways, soil during construction. Default.aspx parking lots or storage areas, Redevelopment does not include concrete or asphalt paving, gravel trenching and resurfacing Contra Costa Clean Water Program Stormwater C.3. roads, packed earthen materials, associated with utility work, and oiled, macadam or other resurfacing and reconfiguring Guidebook surfaces which similarly impede the surface parking lots and existing natural infiltration of storm water. roadways, new sidewalk http://www.cccleanwater.org/Publications/Guidebook/ construction, pedestrian ramps, or Low Impact Development bike lane on existing roads, and Stormwater_C3_Guidebook_5th_Edition.pdf (LID): An integrated site design routine replacement of damaged methodology that uses small-scale pavement, such as pothole repair. detention and retention (Integrated Management Practices, or IMPs) to Roadway: Any paved surface used mimic pre-project site hydrological to carry vehicular traffic (cars/ conditions or improve pre-project trucks, forklifts, farm machinery, or conditions. any other large machinery).
New Development: Development Runoff: Stormwater that does not activity that includes site alteration infiltrate into the ground during (e.g., paving, grading, excavating, and after a rainfall event. filling, or clearing) or installation of structures and other impervious Stormwater: runoff that originates surfaces. as precipitation on a particular site, basin, or watershed. Parking Lot: A land area or Participating Agencies: facility for the parking or storage of motor vehicles used personally, for business, or for commercial purposes. Handout Permeable Pavements: Pavements for roadways, sidewalks, or plazas that are designed to Created in Partnership with the Central Coast infiltrate a portion of rainfall, including pervious concrete, pervious asphalt, unit-pavers-on- sand.
Interim LID Guidelines Handout Interim LID Guidelines Handout Why The Need? Project Tiers On-site Stormwater Runoff Reduction Measures he interim Low Impact Development (LID) Tier 1 Projects guidelines are a pilot project sponsored by he first step in reducing stormwater runoff may be municipalities in San Luis Obispo County and Any project that creates between 2,500 sf to 5,000 sf of as simple as revisiting a proposed site plan with a design professional and adjusting the location of a the Central Coast Regional Water Quality increased impervious surface is considered a Tier 1 ControlT Board. These guidelines and regulations act as a development to preserve natural areas, natural project. A Tier 1 project is required to utilize at least transition into new rules that will be developed as a part of Tdrainage, and limit the amount of grading. Ways to achieving one (1) agency approved stormwater runoff reduction a joint effort to develop new hydromodification control this may include: measure. Please contact this agency’s project engineer or criteria. In addition to the environmental benefits, LID planner for additional guidance. Clustering building(s) may provide aesthetic benefits, and in some cases, an economic benefit as well. These guidelines should be Reducing impervious paved areas utilized to the extent feasible to reduce on-site stormwater Tier 2 Projects Reducing the footprint of a proposed building and runoff. increasing its height as permitted by local ordinance Any project that creates more than 5,000 sf of Increasing landscaping with the use of drought
Our local agency is participating in this effort to meet increased impervious surface is considered a Tier 2 tolerant plant material goals developed by the Central Coast Regional Water project. A Tier 2 project is required to utilize at least Quality Control Board. If you have any questions two (2) agency approved stormwater runoff reduction In addition to some basic site plan/design modifications, a regarding the information in this handout, please contact a measures. Please contact this agency’s project engineer proposed project that is considered Tier 1 shall incorporate planner or public works representative. or planner for additional guidance. at least one (1) of the following Low Impact
Development (LID) measures. A project that is considered Exempt Projects Tier 3 Projects Tier 2 and Tier 3 shall incorporate at least two (2) LID measures. A partial list of measures are located below. If an Any projects that create less than 2,500 square feet (sf) of The following projects within this agency’s jurisdiction applicant proposes to use a measure to fulfill their project increased impervious surface are exempt from these require additional measures that may not be outlined in requirement, the local agency may require drainage guidelines. These projects are still encouraged to reduce this handout. Please contact this agency’s planning or calculations. stormwater runoff as much as possible by utilizing any of public works department for information on additional the provided stormwater runoff reduction measures requirements. Tier 3 projects will require at least two included in this handout. (2) LID measures that retain or reduce runoff and meet LID Measures any additional agency requirements. Rain garden Open-joint block Example Vegetated swales Pavers Automotive repair Parking lots of 25 Hollywood driveway Porous turf pavement NTS shops spaces or more that Bio-retention system Pavement Commercial are potentially disconnection exposed to Infiltration planters developments of Rain barrel 100,000 sf or more stormwater runoff Amend soils Rain water harvesting Gasoline stations Single family Down-spout residential homes on disconnect Green roofs Parking lots that are Hillsides larger than 5,000 sf Reduce roadway Stormwater ponds that are potentially Residential tentative surface (where Wetland creation exposed to subdivisions maps permitted) Other, as approved by with a potential of 5 stormwater runoff Porous paving systems this agency or more units Restaurants Open-cell block pavers
Interim LID Guidelines Handout Interim LID Guidelines Handout Interim LID Guidelines Handout