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+--- Thread: (HP-67) … Culvert Baffling for Fish Passage (/thread-13103.html)
(HP-67) … Culvert Baffling for Fish Passage - SlideRule - 06-10-2019 11:53 AM
An extract from A Study of Model and Prototype Culvert Baffling for Fish Passage, Department of Fisheries and the Environment (Fisheries and Marine Service-Manitoba), Technical Report 828, December 1978
ABSTRACT
Most streams, crossed by roads or highways, are culverted. Many such crossings are impassable to migrating fish because of the culvert length and the high water velocities in them. A hydraulic model study tested and developed devices to aid fish passage through culverts. Based on the model study recommendations, Offset baffles and Spoiler baffles were designed and installed at the Mackenzie Highway crossing of the Redknife River.
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RESUME
La plupart des cours d'eau traversés par des routes doivent couler dans des canaux tubulaires. Or, beaucoup de ces canaux tubulaires constituent une barrière infranchissable à la migration des poissons à cause de leur longueur et de la vitesse du courant. La modélisation hydraulique a permis d'éprouver et de mettre au point des dispositifs facilitant le passage des poissons. Les recommandations formulées par la suite ont été mises à profit pour la conception et l'installation de chicanes "Offset" et "Spoiler" à l'endroit où l'autoroute Mackenzie traverse la Redknife River.
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INTROOUCTION
… This report is intended both as an analytical and a design tool. The designer will be particularly concerned with the report sections on Theory, Operational problems, Conclusions and recommendations, equations (29) and (30), Fig. 2, 3, 35, and 36 and Appendices 1, 2 and 6.
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APPENDIX 1: HYDRAULICS OF CIRCULAR CULVERTS AND BAFFLES
BASIC HYDRAULIC PROPERTIES OF CIRCULAR CULVERTS
An HP-55 desk computer was programmed to calculate Aa, Ap, Ar and Ab given the relative depth 6. The key sequence is as follows:
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NORMAL DEPTH … The following key sequence may be added to the BHPC program to facilitate this calculation:
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CRITICAL DEPTH … The following key sequence may be added to BHPC for this purpose:
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BACKWATER CALCULATIONS … An HP-67 (the HP-55 does not allow enough key entries) was programmed to solve equations (27) and (30). The key sequence in the BCP (Backwater Computations Program) is as follows:
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Very thorough & well documented (descriptions, explanations, equations, etc).
BEST!
SlideRule