Research concerning temporal variations of suspended sediment concentration during period of high water stages was done in the lower course of the Obra River near Międzyrzecz (Western Poland). The analysis regarding dependence of mean suspended sediment concentration and discharge allowed to determine the way of suspended sediment supply to the river bed during high water stages. It was supposed that exposures of glacial and fluvioglacial sediments in high concave banks could be an important factor influencing the amount of delivery of suspended material. Besides, normal hysteretic loops (oriented clockwise) were observed in cross-sections 4 and 5. That fact would suggest that transported material originates form the Obra River bed or its vicinity. The process of sediment accretion was observed on a fragment of drowned floodplain during high water stages. Collection of samples of freshly deposited sediment and grain size analysis allowed to illustrate the mechanism of forming floodplain sediments. It also was possible to draw near conditions of forming such sediments in the past.

The paper presents the concept of vital cities in the context of mechanisms of sustainable development, networking and creativity. The vital city was presented as:

- a city belonging to the inhabitants – a city managed and developed with advanced processes of participation,

- a city of reasonable management – a city that uses and at the same time protects its key potentials,

- a city of creation – a city of creating and implementing new ideas,

- a city of opportunities – a city that creates the conditions for the use of energy and creativity residents,

- a city in the surround – a city with a strong position in the environment.