STRAIGHT DROP SPILLWAY STILLING BASIN

THE STRAIGHT DROP SPILLWAY IS A STRAIGHT OVERFALL WEIR. THE WATER FLOWING OVER THE SPILLWAY FALLS ONTO A HORIZONTAL APRON. THE ENERGY IN THE WATER IS DISSIPATED BY MEANS OF BLOCKS, SILLS, AND TAILWATER. THE WATER IS DISCHARGED FROM THE STILLING BASIN INTO THE DOWNSTREAM CHANNEL IN SUCH A MANNER AS TO PREVENT DAMAGING SCOUR. THE DEVELOPMENT OF THE GENERALIZED DESIGN RULES IS DESCRIBED FOR A NEW SPILLWAY STILLING BASIN FOR USE WITH THE STRAIGHT DROP SPILLWAY. THE STRAIGHT DROP STILLWAY IS USED AS AN EROSION CONTROL STRUCTURE IN GULLIES, AS A GRADE CONTROL STRUCTURE IN DRAINAGE DITCHES, AS AN IRRIGATION DROP AND CHECK STRUCTURE, AND AS A SPILLWAY FOR EARTH DAMS. IT WAS DETERMINED THAT THE STILLING BASIN LENGTH COMPUTED FOR THE MINIMUM TAILWATER LEVEL REQUIRED FOR GOOD PERFORMANCE MAY BE INADEQUATE AT HIGHER TAILWATER LEVELS. DANGEROUS SCOUR OF THE DOWNSTREAM CHANNEL MAY OCCUR IF THE NAPPE IS SUPPORTED SUFFICIENTLY BY HIGH TAILWATER SO THAT IT LANDS BEYOND THE END OF THE STILLING BASIN. A METHOD OF COMPUTING THE STILLING BASIN LENGTH FOR ALL TAILWATER LEVELS IS PRESENTED. /AUTHOR/

  • Supplemental Notes:
    • Tech Paper NO 15, SERIES B, 35 PP, 6 FIG, 4 TAB, 13 PHOT,
  • Corporate Authors:

    Saint Anthony Falls Hydraulic Laboratory

    University of Minnesota, Mississippi River at Third Avenue SE
    Minneapolis, MN  USA  55414
  • Authors:
    • Donnelly, C A
    • Blaisdell, F W
  • Publication Date: 1954-11

Subject/Index Terms

Filing Info

  • Accession Number: 00204147
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1994 12:00AM