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Drainage gradient (DG) is a term in road design, defined as the combined slope due to road surface cross slope (CS) and longitudinal slope (hilliness). Although the term may not be used, the concept is also used in roof design and landscape architecture. If the drainage gradient is too low, rain and melt water drainage will be insufficient.
Section through railway track and foundation showing the sub-grade. Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage.
A drainage equation is an equation describing the relation between depth and spacing of parallel subsurface drains, depth of the watertable, depth and hydraulic conductivity of the soils. It is used in drainage design.
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The Department of Public Works and Highways (Filipino: Kagawaran ng mga Pagawain at Lansangang Bayan), abbreviated as DPWH, is the executive department of the Philippine government solely vested with the mandate to “be the State's engineering and construction arm” and, as such, “tasked to carry out the policy” of the State to “maintain an engineering and construction arm and ...
About 73 percent of cities with a population of 100,000 or more apply a separate calculation method, which divides the cost of sewage into the rainwater cost. Usually, Germany calculates concrete, asphalt, and building roofs as impervious areas and charges an annual fee of $2.6 per m 2. Builders are installing rainfall storage tank and ...
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A poorly graded soil will have better drainage than a well graded soil, [2] if it is not high in clay quality. Soil is graded as either well graded or poorly graded. [ 3 ] Soil gradation is determined by analyzing the results of a sieve analysis [ 4 ] [ 5 ] or a hydrometer analysis .