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2. Drainage gradient - Wikipedia

   en.wikipedia.org/wiki/Drainage_gradient

   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.

3. Permeable paving - Wikipedia

   en.wikipedia.org/wiki/Permeable_paving

   Unlike a full-depth porous asphalt pavement, OGFCs do not drain water to the base of a pavement. Instead, they allow water to infiltrate the top 3/4 to 1.5 inch of the pavement and then drain out to the side of the roadway. This can improve the friction characteristics of the road and reduce road spray. [27]

4. Grading (earthworks) - Wikipedia

   en.wikipedia.org/wiki/Grading_(earthworks)

   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.

5. Landscaping - Wikipedia

   en.wikipedia.org/wiki/Landscaping

   In order to landscape it, the land must be reshaped to direct water for appropriate drainage. This reshaping of land is called grading . [ 4 ] Sometimes in large landscaping projects like, parks, sports fields and reserves soil may need to be improved by adding nutrients for growth of plants or turf, this process is called soil amelioration.

6. Cross slope - Wikipedia

   en.wikipedia.org/wiki/Cross_slope

   Cross section of a road. 1. Gutter; 2. Shoulder; 3. Sub-base; 4. Base course; 5. Asphalt. Cross slope, cross fall or camber is a geometric feature of pavement surfaces: the transverse slope with respect to the horizon.

7. Drainage equation - Wikipedia

   en.wikipedia.org/wiki/Drainage_equation

   the design drain spacing (L) can be found from the equation in dependence of the drain depth (Dd) and drain radius (r). Drainage criteria One would not want the water table to be too shallow to avoid crop yield depression nor too deep to avoid drought conditions. This is a subject of drainage research.

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9. Soil gradation - Wikipedia

   en.wikipedia.org/wiki/Soil_Gradation

   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 .