THE SAF STILLING BASIN: A STRUCTURE TO DISSIPATE THE DESTRUCTIVE ENERGY IN HIGH-VELOCITY FLOW FROM SPILLWAYS

RESEARCH IS SUMMARIZED THAT LED TO THE DEVELOPMENT OF THE ST. ANTHONY FALLS (SAF) STILLING BASIN. THE RESEARCH WAS CONDUCTED AS A RESULT OF A NEED FOR A STILLING BASIN TO DISSIPATE THE ENERGY IN THE HIGH-VELOCITY DISCHARGE FROM CULVERTS, CHUTES, AND OTHER TYPES OF SPILLWAY. TEST RESULTS ARE PRESENTED WHICH WERE MADE TO DEVELOP AND VERIFY THE SAF STILLING BASIN DESIGN: (1) A FORMULA IS GIVEN FOR THE LENGTH OF THE STILLING BASIN FOR FROUDE NUMBERS BETWEEN 3 AND 300, (2) THE HEIGHT OF THE CHUTE BLOCKS AND THE FLOOR BLOCKS WITH WIDTH AND SPACINGS ARE GIVEN, (3) THE FLOOR BLOCK CRITERIA ARE PRESENTED, (4) THE HEIGHT OF END STILL IS GIVEN (5) FORMULA IS GIVEN FOR THE DEPTH OF TAILWATER ABOVE THE STILLING BASIN FLOOR, (6) THE FORMULA IS GIVEN FOR THE HEIGHT OF THE SIDEWALL ABOVE THE MAXIMUM TAILWATER DEPTH TO BE EXPECTED DURING THE LIFE OF THE STRUCTURE, (7) WINGWALLS SHOULD BE EQUAL IN HEIGHT AND LENGTH TO THE STILLING BASIN SIDEWALLS, (8) THE STILLING BASIN SIDEWALLS MAY BE PARALLEL (RECTANGULAR STILLING BASIN), OR DIVERGE AS AN EXTENSION OF THE TRANSITION SIDEWALLS (TRAPEZOIDAL STILLING BASIN), (9) A CUTOFF WALL OF NOMINAL DEPTH SHOULD BE USED AT THE END OF THE STILLING BASIN, AND (10) THE EFFECT OF ENTRAINED AIR SHOULD BE NEGLECTED IN THE DESIGN OF THE STILLING BASIN. IT WAS NOTICED DURING THE TEST THAT THE PERFORMANCE OF THE SAF STILLING BASIN WAS EXCELLENT AT DISCHARGES LESS THAN THE DESIGN DISCHARGE. AT THE DESIGN FLOW THE SAF STILLING BASIN PROVIDES AN ECONOMICAL METHOD OF DISSIPATING ENERGY AND PREVENTING DANGEROUS STREAM BED EROSION.

  • Supplemental Notes:
    • Handbook No 156, 16 PP, 2 FIG, 1 TAB, 7 PHOT, 19 REF
  • Corporate Authors:

    Department of Agriculture

    1400 Independence Avenue, SW
    Washington, DC  United States  20250
  • Authors:
    • Blaisdell, F W
  • Publication Date: 1959-4

Subject/Index Terms

Filing Info

  • Accession Number: 00204146
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 18 1994 12:00AM