Forest Research Institut Baden-Württemberg (FVA)
Department of forest economics
Tel: +49 761 4018 231
Fax: +49 761 4018 333
of proposed wet storage sites should be considered in advance, before
commencing to build the site. Costs and effort can vary widely depending on
initial situation (e.g. sealed surface or grassland,…), prior and future land
use and agreements in the contract of lease etc.
|Pic. 1: The timber is gone – what now?|
Bark needs to be cleared away and disposed of, usually in landfills for ground excavation (subject to charges). It might be possible to sell good quality bark residues to gardening companies. Removal of roads turned out to be expensive. To save some of the costs for disposal of the material, it could be used otherwise in the enterprise. Check in advance whether material is needed e.g. to upgrade or repair forest roads.
The humus layer should be cleared away when building the site and stored separately. It can then be used later for recultivation. Losses of topsoil are inevitable. Keep an eye out for opportunities to gather additional topsoil from elsewhere. Experiences after “Lothar” showed that additional costs for recultivation amounted to, on average, 0.15 – 1.00 € per m³ timber.
Document the initial situation elaborately (photos if necessary) before commencing storage to help plan recultivation and avoid conflicts.
Wet storage is an appropriate method to conserve large amounts of timber after storm calamities. Broad information on how to set up and maintain a wet storage site should be made available to all members of staff (every forest district).
A few (2-3 for Baden-Wuerttemberg) selected long-term operated sites will help maintain today’s standard of knowledge and gain new experience. Specialists from these sites can act as information multipliers in the event of future storms. Training can be provided by the specialists, and they can be consulted by site operators if problems arise during the storage period. Discussion forums can be used to exchange experiences, discuss current problems, and present innovative, customised solutions.
A comprehensive list of potential wet storage sites should be compiled and revised and updated regularly. This will help in the event of future calamities. Sites should be evaluated regarding suitability for use after calamities. Permanent operation permissions for a few selected sites can help gather long-term know-how.
Conflicts of interests: Fishing clubs, operators of campsites and swimming pools fear their activities might be impaired (e.g. water pollution). Residents might complain about the noise of engines during rolling in and out and a possible rise in mosquito populations.
storage is a suitable standard storing method for long logs. Wet storage of
short wood is possible in principle, but more complex and cost-intensive:
Wet conservation of beech is possible in principle, but should only be realised by request of a customer, after the sale contract (which stipulates the period of storage) was signed.
Max. time of storage: Sliced veneer: 5 months
Peeled veneer: 12-14 months
Irrigation of beech requires 20% more water to preserve timber quality (compared to softwood).
A literature study was conducted on behalf of the Forest Authority and the regional authority (fishery office) of Freiburg in 2001. It deals with the impacts of wet storage sites for the conservation of windthrown spruce and fir logs on the biocenosis of flowing waters. Special attention is turned on the impacts on fish in open waters and ponds. (Forest Authority Freiburg, 2001, unpublished).
The authors arrive at the conclusion that wet storage has only minor sustained negative impacts on the biocenosis of flowing waters if the legal requirements are complied with (in Baden-Wuerttemberg, this is the Verwaltungsvorschrift Nasslagerung, administrative regulations on wet storage). Wet storage can be considered comparatively environment friendly as no pesticides are used. However, concentrated washout from over 2,000 m³ stored timber is a substantial load. This can have negative impacts on aquatic biocenoses. Receiving waters play an important neutralising role here. A minimum amount of water should therefore be available in both extraction and discharging waters at all times. The state office for water supply and distribution Rhineland-Palatinate published recommendations for wet storage after "Wiebke" and "Vivian" (Ittle-Reinlassöder, 1991). These were based on values measured in the vicinity of several wet storage sites. Results of toxicity tests did not show any indication of negative impacts resulting from wet storage.