HY8:Colorado State University (CSU) Rigid Boundary Basin

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Colorado State University (CSU) Rigid Boundary Basin

No input variables are required for this calculation; however, one design is selected by the user.


All possible designs for CSU Rigid Boundary Basins are calculated for the given culvert and flow. Designs which do not dissipate sufficient energy are discarded. The criteria of the remaining designs are numbered and displayed one at a time.

Designs are calculated and displayed in order of increasing width, increasing number of element rows, and increasing element height. As a result, smaller, less expensive designs are presented first.


The following figures show a Colorado State University (CSU) Rigid Boundary Basin:

HY8fig9-1CSU.jpg

Variables from the figure:

  • W0 — Culvert width at culvert outlet
  • W1 — Element width which is equal to element spacing
  • h — Roughness element height

HY8fig9-2CSU.jpg

Variables from the figure:

  • V0 — Velocity at the culvert outlet
  • VA — Approach velocity at two culvert widths downstream of the culvert outlet
  • VB — Exit velocity, just downstream of the last row of roughness elements
  • y0 — Depth at the culvert outlet
  • yA — Approach depth at two culvert widths downstream of the culvert outlet
  • yB — Depth at exit
  • W0 — Culvert width at the culvert outlet
  • LB — Total basin length
  • L — Longitudinal spacing between rows of elements

HY8fig9-3sketch.jpg

Variables from the figure:

  • WB — Width of basin
  • W0 — Culvert width at the culvert outlet
  • L — Longitudinal spacing between rows of elements
  • Nr — Row number


WB/W0 2 to 4 5 6 7 8
W1/W0 0.57 0.63 0.6 0.58 .62
Rows (Nr) 4 5 6 4 5 6 4 5 6 5 6 6
Elements (N) 14 17 21 15 19 23 17 22 27 24 30 30
Rectangular h/yA L/h Basin Drag Coefficient, CB
.91 6 0.32 0.28 0.24 0.32 0.28 0.24 0.31 0.27 0.23 0.26 0.22 0.22
.71 6 0.44 0.40 0.37 0.42 0.38 0.35 0.40 0.36 0.33 0.34 0.31 0.29
0.48 12 0.60 0.55 0.51 0.56 0.51 0.47 0.53 0.48 0.43 0.46 0.39 0.35
0.37 12 0.68 0.66 0.65 0.65 0.62 0.60 0.62 0.58 0.55 0.54 0.50 0.45
Circular 0.91 6 0.21 0.20 0.48 0.21 0.19 0.17 0.21 0.19 0.17 0.18 0.16
0.71 6 0.29 0.27 0.40 0.27 0.25 0.23 0.25 0.23 0.22 0.22 0.20
0.31 6 0.38 0.36 0.34 0.36 0.34 0.32 0.34 0.32 0.30 0.30 0.28
0.48 12 0.45 0.42 0.25 0.40 0.38 0.36 0.36 0.34 0.32 0.30 0.28
0.37 12 0.52 0.50 0.18 0.48 0.46 0.44 0.44 0.42 0.40 0.38 0.36


v • e
HY-8
Introduction:Getting Started   •   Layout   •   Vena Contracta   •   Building a Project   •   Locate Project   •   Culvert Crossing Data   •   Run Analysis   •   Report Generation
Crossing and Culvert Data:Crossings   •   Discharge Data   •   Roadway Data   •   Tailwater Data   •   Irregular Channel   •   Culvert Data   •   Site Data   •   Culvert Invert Data   •   Embankment Toe Data
AnalysisProject Units   •   Roadway Overtopping   •   Inlet Control Computations   •   Outlet Control Computations   •   Tables and Plots
Energy DissipationScour Hole Geometry   •   Increased Resistance   •   Tumbling Flow   •   USBR Type IX Baffled Apron   •   Drop Structures   •   Stilling Basins   •   Streambed Level Structures
MethodsAquatic Organism Passage   •   Low Flow Hydraulics
TroubleshootingDifferences from DOS HY-8   •   Limitations   •   HY-8 User Manual
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