STUDY OF EROSION IN ROADSIDE DRAINAGE CHANNELS IN NORTH CAROLINA

DESIGN CRITERIA FOR ROADSIDE DRAINAGE CHANNELS ARE ESTABLISHED ON THE BASIS OF AN EXTENSIVE FIELD INVESTIGATION IN NORTH CAROLINA. BY MEANS OF DIRECT MEASUREMENTS, FIELD INSPECTIONS AND COMPUTATIONS, DATA ON THE SIZE AND CHARACTERISTICS OF THE DRAINAGE AREA, THE DISCHARGE, THE CHANNEL SLOPE, THE CHANNEL SHAPE, CHANNEL SIZE, SOIL PROPERTIES, WATER DEPTH AND VELOCITY, AND THE EXTENT OF EROSION ARE OBTAINED. THE CRITERIA, WHICH ARE DERIVED FROM THE ANALYSIS OF THE DATA, ARE PRESENTED AS THREE DIFFERENT METHODS. IN THE FIRST METHOD, A LIMITING VALUE OF THE TRACTIVE SHEAR STRESS BELOW WHICH THE CHANNEL WILL REMAIN STABLE IS GIVEN AS A FUNCTION OF A STATISTICAL SOIL PARTICLE SIZE. IN THE SECOND METHOD, VALUES OF VR (WHERE V IS THE AVERAGE VELOCITY IN THE CHANNEL AND R IS THE HYDRAULIC RADIUS) SEPARATING THE STABLE CHANNEL FROM THE ERODING CHANNEL ARE GIVEN AS FUNCTIONS OF A STATISTICAL SOIL PARTICLE SIZE. IN THE THIRD METHOD, WHICH IS RESTRICTED TO CHANNELS WITH SIDE SLOPES FROM 3:1 TO 6:1, VALUES OF Q/S (WHERE Q IS THE DESIGN DISCHARGE AND S IS THE CHANNEL BOTTOM SLOPE) FOR A GIVEN SOIL TYPE DETERMINE STABILITY. THE USER CAN CHOOSE WHICHEVER METHOD HE FINDS MOST CONVENIENT. EXAMPLES ILLUSTRATING THE APPLICATIONS OF THE THREE METHODS ARE GIVEN. THE USE OF THE CRITERIA ARE EXPECTED TO LEAD TO THE DESIGN OF STABLE CHANNELS AND WOULD ALSO ACHIEVE ECONOMY THROUGH REDUCED MAINTENANCE COSTS AND THROUGH THE ELIMINATION OF UNNECESSARY PAVING. /AUTHOR/

  • Supplemental Notes:
    • Rept Erd-110-68-4, 40 PP, 13 FIG, 1 TAB, 5 REF
  • Corporate Authors:

    North Carolina State University, Raleigh

    Highway Research Program, P.O. Box 5993
    Raleigh, NC  USA  27607
  • Authors:
    • Amein, M
    • Chu, H L
  • Publication Date: 1970-4

Subject/Index Terms

Filing Info

  • Accession Number: 00204288
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 22 1970 12:00AM