Jordbruksdränering, kostnader och genomförande
Underdrainage is a costly investment but often a necessity to maintain rationalized plant cultivation, one can also see underdrainage as insurance to successful plant cultivation. Late ripening crops, low yield and difficult tillage cultivation are examples on an insufficient drainage. (Kvarnemo 1983) A drained field rise in land price and the scheme of the tiled drains is seen as a value item.
The interest for underdrainage among the farmers follows with shifting economic situations within agriculture and has for long time been low.
A big part of the Swedish tiled drainage systems is since 1930 and ahead. Many of these tiled drainage systems need to be replaced or complemented. The life length of one tiled drainage system varies with maintenance but can still remain in good function after 75 years with correct management. Factors that can limit the life length of tiled drainage are for example elutriation of particles, choked-up by roots or folding out by ferrous oxide. (Kvarnemo 1983)
In my work, I have select to retype the underdrainage implementation and upright calculations for what one underdrainage costs per hectare. The result I come until with my calculations is that additional cost in order to choose a more frequent ditch distances in the underdrainage system is small. It can often be appropriately to choose a more frequent tiled ditch distances in the drainage system. That can be seen as a good assurance against the future's higher requirements on farmland.