The rates of roughness of the drainage channel reinforced with grassing
1999
Jakubis, M. (Technical University in Zvolen, Zvolen (Slovak Republic). Faculty of Forestry)
The object of the research was informative determination of the rate of roughness of the drainage channel reinforced with mown and unmown grass cover. The average value of the rate of roughness for mown grass cover is n2 = 0.031; for unmown n2 = 0.035, the difference makes 13.32%. Drainage and irrigation channels reinforced with grassing are convenient (considering the correct maintenance) from the ecological - environmental, economical and aesthetic terms. The fact that field tests instead of laboratory measurements have been evaluated can be considered as a contribution. It would be appropriate to continue in research in order to generalise the results. Apart from that in connection with the solving problem it would be suitable to concentrate on the questions of the length of possible continuous flooding of vegetation (particular grass species); the ways of grassing down, reinforcement of low (always overflown) parts of slopes, the selection of site (ecologically) suitable mixtures of species for specific sites, determination of flow rate limits for grassing down the slopes etc. The solution of these tasks based on the field measurements would bring an amount of documentation needed for optimal, economical (not under or overdimensioned) layout of drainage and irrigation channels
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