STATE-OF-THE-PRACTICE IN MARYLAND--PART II
Based on the present methods of determining the permeability of bituminous concrete surface and base courses, the Maryland State Highway Administration (MSHA) considers that its bituminous mixes provide courses that are reasonably impermeable. As outlined in Part I of this paper, four types of subsurface drainage systems are used by MSHA: extended granular subgrades or subbases, continuous longitudinal pipe underdrain, subgrade drains, and conventional pipe underdrain. The drainage components that comprise MSHA drainage systems are influenced by material availability and the economics associated in the material selection. Although the material components appear in line, the means whereby the surface water can get to the drainage medium is still questionable, as is the location and geometrics of the system. Problems with any subsurface waters have generally been minimized by MSHA design practices. The primary concern is with surface runoff on open section facilities getting to the drainage medium. MSHA is hoping that problem conditions can be minimized by concentrating on material specifications and geometrics to limit the entrance of water, and by emphasizing material quality control to effect the desired rapid drainage through the system.
- This paper was presented at a 1973 workshop on Water in Pavements sponsored by the Federal Highway Administration, held in Albany, New York.
Washington, DC United States 20590
- Greene, W B
- Publication Date: 1973
- Pagination: p. 194-199
- TRT Terms: Base course (Pavements); Bituminous concrete pavements; Design; Drainage; Drainage practices; Drainage structures; Drains; Economics; Geometric design; Groundwater; Highways; Infiltration; Materials; Pavement performance; Pavements; Permeability; Pipe; Quality control; Road shoulders; Runoff; State highway departments; State of the practice; Subbase (Pavements); Subdrains; Subgrade (Pavements); Water
- Geographic Terms: Maryland
- Subject Areas: Design; Economics; Highways; Hydraulics and Hydrology; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I26: Water Run-off - Freeze-thaw;
- Accession Number: 00792253
- Record Type: Publication
- Files: TRIS, USDOT
- Created Date: May 4 2000 12:00AM