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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. Runoff curve number - Wikipedia

    en.wikipedia.org/wiki/Runoff_curve_number

    Natural desert landscaping (pervious area only) 63: 77: 85: 88 Artificial desert landscaping (impervious weed barrier, desert shrub with 1- to 2-inch sand or gravel mulch and basin borders) 96: 96: 96: 96 Urban districts Commercial and business (85% imp.) 89: 92: 94: 95 Industrial (72% imp.) 81: 88: 91: 93 Residential districts by average lot size

  4. Site plan - Wikipedia

    en.wikipedia.org/wiki/Site_plan

    A site plan or a plot plan is a type of drawing used by architects, landscape architects, urban planners, and engineers which shows existing and proposed conditions for a given area, typically a parcel of land which is to be modified. Sites plan typically show buildings, roads, sidewalks and paths/trails, parking, drainage facilities, sanitary ...

  5. 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.

  6. Drainage density - Wikipedia

    en.wikipedia.org/wiki/Drainage_density

    Drainage density relates to the storage and runoff terms. Drainage density relates to the efficiency by which water is carried over the landscape. Water is carried through channels much faster than over hillslopes, as saturated overland flow is slower due to being thinned out and obstructed by vegetation or pores in the ground. [7]

  7. Drainage equation - Wikipedia

    en.wikipedia.org/wiki/Drainage_equation

    Theoretically, Hooghoudt's equation can also be used for sloping land. [8] The theory on drainage of sloping land is corroborated by the results of sand tank experiments. [9] In addition, the entrance resistance encountered by the water upon entering the drains can be accounted for. Definitions of drainage of sloping land and entrance resistance

  8. Urban runoff - Wikipedia

    en.wikipedia.org/wiki/Urban_runoff

    As stormwater is channeled into storm drains and surface waters, the natural sediment load discharged to receiving waters decreases, but the water flow and velocity increases. In fact, the impervious cover in a typical city creates five times the runoff of a typical woodland of the same size. [9] [clarification needed]

  9. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    l = slope length α = angle of inclination. The grade (US) or gradient (UK) (also called stepth, slope, incline, mainfall, pitch or rise) of a physical feature, landform or constructed line is either the elevation angle of that surface to the horizontal or its tangent. It is a special case of the slope, where zero indicates horizontality. A ...

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