This paper outlines the basis of theoretical analyses of the manner in which water infiltrates into unsealed shoulders and across into the pavement and the manner in which it is subsequently redistributed and drained from the pavement. Results are presented for one standard case of a homogeneous pavement and shoulder resting on an impervious subgrade. The results show how a perched table diverts water along the subgrade surface into the pavement. A simple analysis shows how the degree of development of a perched water-table varies with the relative permeability of the subgrade. After the end of rain the infiltrated water drains from the edge of the shoulder until the water pressure at the bottom of the shoulder falls to atmospheric. Once drainage ceases, the remainder of the water is retained in the shoulder and pavement as capillary water. As time progresses this capillary water is redistributed over the lower levels of the shoulder and pavement. Reference is made to the results of other analyses which show how the basic phenomena are effected by various factors such as: (a) intensity and duration of rain: (b) ponding on the shoulder; and (c) boxed construction and sub-drainage. /Author/

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 8-13
  • Serial:
    • Volume: 8
    • Issue Number: 8

Subject/Index Terms

Filing Info

  • Accession Number: 00149464
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 30 1977 12:00AM