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For cleaning and inspection, utility holes and risers are often installed along the drains The Corps of Engineers recommends that utility holes be placed at intervals of not more than 1000 ft, with one riser approximately midway between the holes [7] The function of the riser is to be able to insert a hose for flushing the system The function of a utility hole is to permit inspection of the pipes
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The term filter material applies to the granular material which is used as backfill in the trenches where subdrains are placed To permit free water to reach the drain, the filter material must be many times more pervious than the protected soil Yet if the filter is too pervious, the particles of soil to be drained will move into the filter material and clog it On the basis of some general studies conducted by K Terzaghi, the Corps of Engineers has developed an empirical design for filter material which has been substantiated by tests [10] The criteria for selecting the gradation of the filter material are as follows:
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1 To prevent clogging of a perforated pipe with filter material, the following requirement must be satisfied: 85% size of filter material >1 Diameter of perforation 2 To prevent the movement of particles from the protected soil into the filter material, the following conditions must be satisfied: 15% size of filter material 5 o 85% size of protected soil and 50% size of filter material 25 o 50% size of protected soil 3 To permit free water to reach the pipe, the following condition must be fulfilled: 15% size of filter material 5 o 15% size of protected soil A typical example of design is shown in Fig 9-16 Concrete sand has proved to be a satisfactory filter material for the majority of fine soils which are drainable A single gradation of filter material is preferred for simplicity of construction Filter materials tend to segregate as they are placed in trenches To minimize this tendency, the material should not have a coefficient of uniformity greater than 20 For the same reason, filter materials should not be skip-graded Filter materials should always be placed in a moist state The presence of moisture tends to reduce segregation
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Certain types of soils, such as gravelly sands, sand, and sandy loams, are usually self-draining and require very little, if any, subsurface drainage Subsurface drainage can be effective for draining clay loams, sandy clay loams, and certain silty loams The amount of sand in these soils largely determines how drainable they are For soils containing a high percentage of silt and clay, subsurface drainage becomes very problematic
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This means that 85 percent (by weight) is finer than the specified size
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FIGURE 9-16
Design example for lter materials (Corps of Engineers)
References
1 Surface Drainage Design, Advisory Circular AC 150/5320-5C, Federal Aviation Administration, Washington, 2006 2 Airport Drainage, Advisory Circular AC 150/5320-5B, Federal Aviation Administration, Washington, 1970 3 Conduits, Culverts, and Pipes, Engineering Manual EM 1110-2-2902, Department of the Army, Washington, 1969 4 Design of Drainage Facilities for Military Airfields, G A Hathaway, Transactions, American Society of Civil Engineers, New York, 1949 5 Drainage and Erosion Control Drainage for Areas Other than Airfields, Tech Manual TM 5-820-4, Department of the Army, Washington, 1965 6 Drainage and Erosion Control Structures for Airfields and Heliports, Tech Manual TM 5-820-3, Department of the Army, Washington, 1965 7 Drainage and Erosion Control Subsurface Drainage Facilities for Airfield Pavements, Tech Manual TM 5-820-2, Department of the Army, and Air Force Manual AFM 88-5, Department of the Air Force, Washington, 1979 8 Drainage and Erosion Control Surface Drainage Facilities for Airfields and Heliports, Tech Manual TM 5-820-1, Department of the Army, and Air Force Manual AFM 88-5, Washington, 1987 9 Drainage of Asphalt Pavement Structures, Manual Series MS-15, The Asphalt Institute, College Park, Md, 1984 10 Filter Experiments and Design Criteria, Tech Memo 3-360, US Army Corps of Engineers, Waterways Experiment Station, Vicksburg, Miss, 1953 11 On-Site Stormwater Management: Applications for Landscape and Engineering, B Ferguson and T H Debo, 2d ed, Van Nostrand and Reinhold, New York, 1990 12 Pavement Subsurface Drainage Systems, H H Ridgeway, Synthesis of Highway Practice, No 96, Transportation Research Board, Washington, 1982
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