1 ENTE PER LE NUOVE TECNOLOGIE, L’ENERGIA E L’AMBIENTE ISSN/ 1120 /5555 Serie Ambiente IMPLEMENTING COMPUTERISED METHODOLOGIES TO EVALUATE THE EFFECTIVENESS OF COUNTERMEASURES FOR RESTORING RADIONUCLIDE CONTAMINATED FRESH WATER ECOSYSTEMS Edited by L. MONTE ENEA Centro Ricerche della Casaccia, Roma (Italy) J. E. BRITTAIN University of Oslo (Norway) L. HÅKANSON University of Uppsala (Sweden) E. GALLEGO DÍAZ Universidad Politécnica de Madrid (Spain) M. ZHELEZNYAK IMMSP, Kiev (Ukraine) O. VOITSEKHOVITCH UHMRI, Kiev (Ukraine) I. KRYSHEV, TYPHOON Obninsk(Russia) K. MARINOV PETROV Bulgarian Academy of Sciences, Sofia (Bulgaria) COMETES PROJECT Contract: ERB IC15-CT98-0203 RT/AMB/2001/28