Manual of beaver management within the ... - DANUBEPARKS

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Manual of beaver management within the Danube river basinFor mapping purposes, it is recommended to measure the length and height of dam.Photo No. 20.: Beaver dike6.4.2.2.5.3. ChannelsUsing channels, beavers interconnect waterbodies, make available food supplies andbuilding materials. Channels are usually flooded with water and their length can reachseveral hundred meters, width 0.5 m (max. 3 m) and have a depth ranging from 40 to70 cm (max 140 cm). Depth over 1 m is dug up only for short distances, and serves asa shelter. In the reed and peat are evident traces of gnawing teeth. Shallow sectionswith insufficient depth are enclosed by impermeable embankment of 30 to 40 cmheight. Channel width is about 0.5 meters, tens of meters in length, depth greater than0.7 m. Beaver channels characteristically converge to the lodge. Sometimes, beaversmask sections of channels near the burrow by laid branches. Channels are built mostlyin the second half of the summer at lower water levels.For mapping purposes, it is recommended to measure the length and depth of thechannel and detailed description of the construction techniques such as gnawing,enclosing by embankment and so on. Noteworthy are the intersections of beaverchannel and reservoir on a beaver dam.39
Manual of beaver management within the Danube river basinPhoto No. 21.: Beaver channel dug in the soil and gnawed in reed.6.4.2.2.5.4. Reservoirs and pondsIncreased and stable water level hides entrances to the lodge and burrows, allowsflooding of food stored for the winter, reduces escape distance and facilitate thetransport of timber. Beaver reservoir maintain a stable level of water compared tostream water levels. Beaver achieve this by letting the inflowing water pass through theedge of weir or dam and immediately corrects any damage. Surfaces of beaverreservoirs in the lowlands reach as much as several tens of hectares. Reservoirsaccumulate different amounts of water – from 100 to 200,000 cubic meters.Beaver reservoirs and ponds are striking features of the landscape, mainly usedfor aerial monitoring. They are also useful for land based survey.40
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Manual of beaver management within the ... - DANUBEPARKS

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