Markku Saarinen , Timo Silver, Samuli Joensuu

Ojien mitoitus kunnostusojituksessa. Kirjallisuustarkastelu

Saarinen M., Silver T., Joensuu S. Ojien mitoitus kunnostusojituksessa. Kirjallisuustarkastelu.

Tiivistelmä

Drainage of pristine mires has been discontinued in Finland and now drainage activity focuses on remedial treatment of old ditch networks on transformed drained mires. In the era of first-time drainage, uniform regulations were applied in the dimensioning of ditches. Also the current national recommendations pertaining to remedial drainage and the dimensioning of ditches corresponds to the old regulations applied in first-time drainage. However, regional organizations have their own directives, and accordingly ditch depths show considerable regional variation. The purpose of this paper is to look for answers to questions which have arisen already some years ago, especially among practitioners responsible for forest-improvement works in non-industrial, private woodlots: Can the service life of ditch networks be increased by means of ditches which are deeper than those implemented at the time of first-time drainage and will this also result in a reduced impact on water ecosystems by reducing the number of remedial actions needed ? Is ditch depth in old, well-stocked drainage areas a more important factor than ditch spacing in controlling the drainage depth?

Avainsanat
peatlands; ditch network maintenance; drainage areas

Vastaanotettu 31.10.2017 Julkaistu 1.1.1998

Katselukerrat 1710

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