the total development density at that which could be constructed on the site under conventional zoning and regulations leaving surrounding land without paving or buildings. This is a common method of preserving natural land features, agriculture, sensitive land areas, etc. The open space area is often developed for recreational use. 2. The grouping of plants, especially of the same type.

cluster (residential) 1. The layout of residential buildings or dwelling units in such a way as to provide less area of disturbance to the land, allowing more area to remain in agriculture or a natural condition, or as a developed open space. 2. The placement of more than one residential building on a single lot or parcel of land for the purpose of constructing single-family residential dwelling units, whether in an attached or detached construction arrangement.

cluster subdivision A wholly or principally residential subdivision that permits a reduction in lot area, setback, or other site development regulations, provided there is no increase in the overall density permitted for a conventional subdivision in a given zoning district. The remaining land area is used for common space as a visual or functional amenity or as a means of ecological preservation.

cm Abbreviation for centimeter(s).

cmp Abbreviation for corrugated metal pipe.

CMU Abbreviation for concrete masonry unit.

CN ratio Abbreviation for carbon to nitrogen ratio.

CNRC Abbreviation for Canadian National Research Counsel.

CO 1. Abbreviation for cleanout. 2. Abbreviation for certificate of occupancy. 3. Abbreviation for change order.

coarse The portion of sand with particles Ho of an inch to M of an inch in size.

coat A single layer of paint, stain, etc. applied to a surface.

coated nail A nail with a coating of galvanization, cement, or other material meant to prevent it from coming loose.

cobble or cobble stone or cobblestone 1. A

rounded stone larger than a pebble or gravel but smaller than a boulder, especially when used for paving or construction purposes. 2. A rock fragment or rounded rocks between 2M and 10 inches (64 to 256 mm).


cob wall A wall made up of clay, straw, and gravel.

cocoon A protective coating secreted by an insect larva in which a pupa develops.

code This term is sometimed used in the construction industry to reference any regulations imposed on design and work by governing agencies.

code of practice A document of standards outlining acceptable construction with various materials and workmanship.

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