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Term Definition
Design Rate of Flow. In a pool, spa, or hot tub, the rate of flow in gallons divided by the number of minutes in the turnover time; also called the Design Filter Rate.  
Design Temperature. A temperature close to the lowest expected for a location, used to determine design heat load.  
Design. To conceive or plan out in the mind.  
Design/Build Institute of America. 1010 Massachusetts Avenue, NW, Suite 350, Washington, DC 20001, (202) 682-0110  
Design/Build. A project delivery system in which the same entity is responsible for both design and construction.  
Destructive Distillation. Distilling a product at a temperature so high that products obtained are of different chemical composition than existed in the original material.  
Destructive Testing. Testing of building materials in a manner that destroys the material.  
Detail. 1. Extended treatment or attention to particular items. 2. Drawing of a small portion of an assembly.  
Detectable Warning. A standardized surface or feature built in or applied to walking surfaces or other elements to warn visually impaired persons of hazards in the path of travel.  
Detector, Leak. See Leak Detector.  
Detector, Smoke. See Smoke Detector.  
Detergent. Cleaning agent.  
Deterioration. Depreciation; loss of value of real property due to physical wear and tear.  
Determinate. 1. Having defined limits; definite. 2. Statically Determinate; see Statically Determinate Structures.  
Developed Length. The length as measured along the center line of the pipe and fittings.  
Development Length. In reinforced concrete, the length of steel reinforcing required to develop the required bond between the reinforcing and the adjacent concrete.  
Device Cover. A protective or ornamental removable cover over an electrical box or device.  
Device. 1. A piece of equipment or a mechanism designed for a special purpose or function. 2. An ornamental design. 3. A unit of an electrical system which is intended to carry but not utilize electric energy.  
Devil’s Float. In plastering, a wooden float with two nails protruding from the toe, used to roughen the surface of the brown coat.  
Dew Point. Temperature at which vapor, at 100 percent humidity, begins to condense and deposit as liquid on cold surfaces.  
Dew. Condensed atmospheric moisture deposited in small drops on cool surfaces.  
Dewatering. To remove water from the ground or excavations with pumps, wellpoints, or drainage systems.  
Dew-Point Temperature. The temperature at which condensation occurs.  
Dextral. Right handed.  
DF. 1. Douglas Fir. 2. Drinking Fountain.  
DFPA. Douglas Fir Plywood Association  
DG. Decomposed Granite.  
DHI. Door & Hardware Institute.  
Diagnostic Architecture. The science and practice of analyzing building failures to determine the causes and devise repair methods.  
Diagonal Bond. This is a form of raking bond in which the bricks are laid in an oblique direction in the middle section of a thick wall; the bricks may also be laid in this fashion in paving.  

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