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. The earthworks created for such a purpose are often called the sub-grade or finished contouring (see diagram).
Regrading
Regrading is the process of grading for raising and/or lowering the levels of land. Such a project can also be referred to as a regrade.
Regrading may be done on a small scale (as in preparation of a house site)[3] or on quite a large scale (as in major reconfiguration of the terrain of a city, such as the Denny Regrade in Seattle).[2]
Regrading is typically performed to make land more level (flatter), in which case it is sometimes called levelling.[4]) Levelling can have the consequence of making other nearby slopes steeper, and potentially unstable or prone to erosion.
Transportation
In the case of gravel roads and earthworks for certain purposes, grading forms not just the base but the cover and surface of the finished construction, and is often called finished grade.[5]
Process
After the existing conditions of the limit of work has been surveyed, surveyors will set stakes in places that are to be regraded. These stakes have marks on them that either give a finished grade to the design of the project, or have CUT/FILL marks which specify how much dirt is to be added or subtracted. All grade marks are relative to site benchmarks that have been established.[6] The regrading work is then often done using heavy machinery like bulldozers and excavators to roughly prepare an area, then a grader is used for a finer finish.
^"Grade.1.". def. 2. Whitney, William Dwight, and Benjamin E. Smith. The Century dictionary and cyclopedia vol.3. New York: Century Co., 1901. 2589. Print.
^ a b cWalt Crowley, Seattle Neighborhoods: Belltown-Denny Regrade -- Thumbnail History, HistoryLink.org essay #1123, May 10, 1999. Accessed online 16 October 2007.
^ a b c dTrees and Home Construction: Minimizing the impact of construction activity on trees, University of Ohio Extension Bulletin 870-99. Accessed online 16 October 2007.
^"Montana, McLaren Tailings", p.35 in CERCLA Imminent Hazard Mining and Mineral Processing Facilities, Office of Solid Waste, U.S. Environmental Protection Agency, February 1997. Accessed online 16 October 2007.
^Workshop, Design (2015-12-02). Landscape Architecture Documentation Standards: Principles, Guidelines, and Best Practices. John Wiley & Sons. ISBN 978-1-118-41807-9.
^Ghilani, Charles (2011). Elementary Surveying: An Introduction To Geomatics (13th ed.). Pearson. pp. 698–699. ISBN 9780132554343.
^Malcolm Puller, Deep Excavations: A Practical Manual, Thomas Telford (1996). ISBN 0-7277-1987-4. p. 63.
^Barry Stone, Adjacent Property Regrading Creates Drainage Problem for Homeowner, doityourself.com. Accessed online 16 October 2007.
External links
Wikimedia Commons has media related to Grading.
Wikimedia Commons has media related to Regrading.
Matusik, John. "Grading and Earthworks" in The Land Development Handbook, 2004.
Gravel Roads Construction and Maintenance Guide Archived 2018-12-15 at the Wayback Machine, Federal Highway Administration (FHWA) and the South Dakota Local Technical Assistance Program (SDLTAP), 2015.
"How to Grade Gravel Roads" in Gravel Roads, Soil Stabilization, Soil-Sement® by Frank Elswick, 2017.
Recommended Practices Manual: A Guideline for Maintenance and Service of Unpaved Roads, Choctawhatchee, Pea and Yellow Rivers Watershed Management Authority, 2000.