????. ?-? ????? ???????????: ???????????? ????????? ? ??????? ????? ???????????????? ?? ????????????? ??? ??? ?????? ? ?????????????? ???????. ? ???? ?????????. ????????, ???? ??????? ????????, ?????? ???????????? ?? ?????? ??? ????????? ?????: ????????? ???????? ???????.The hydrological network had been altered by the development of Saint Petersbu