Summary:

In paper were analysed topical supplies of waters in marshlands, in water-courses, reservoirs and fish ponds on areas of eleven forest inspectorates situated in central parts of the wielkopolskie province. Selected forest inspectorates: Babki, Czerniejewo, Gniezno, Grodzisk, Jarocin, Konstantynowo, Kościan, Łopuchówko, Oborniki, Piaski, Pniewy. These forest inspectorates are situated on areas of twel-fth administrative districts: gnieźnieński, gostyński, grodziski, jarociński, kościań-ski, nowotomyski, obornicki, poznański, szamotulski, śremski, średzki and wrzesiń-ski. Investigated area included about 10 thousand km2, in this forest area about 5 thousand km2. Analysises were concerning to so-called small water retention. This term defining all interventions having in view extension way and time of cir-culation of water in catchments. Usually this is understanding as stopping and dam up waters in water-courses and accumulation her in water reservoirs. To small retention belong water reservoirs about entire capacities < 5 million m3. Ac-tivities in range of small retention serve to improvement of water balance in ca-tchments across enlarging of supplies discretionary waters. Determine also impor-tant element of protection of waters quality. Indicatory value of small water retention water are 6246 m3/km2, in this in marshlands stored water equal 2184 m3/km2. In plans to 2015 foresees on investigated areas of forest inspectora-tes build about 100 devices to dam up water of water-courses in forest. Prospec-tive height indicatory of small water retention will be equal 1024 m3/km2. Skipping water stored in marshlands, planned increase small water retention on areas of investigated forest inspectorates will be equal about 25% of present state of water retention. Planned building of numerous dams on water-courses and devices to dam up water on reservoirs are cheapest methods of enlarging of water supplies in catchments. Build of these technical devices no doubt will contribute also to protection very valuable marshland biotopes, fulfilling mostly functions protective and recreational - in this as above one marked water retention.