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Actual, highly insufficient, degree of sanitation development in Polish rural settlements shows that
construction of centralized or local systems of sanitary sewage becomes the priority task in municipal
management of rural settlements. According to the official data 23 740 000 of Polish citizens
have access to centralized sanitation but only 3 700 000 are the residents of rural settlements (of 15
000 000 rural population, which gives the 25% factor of access to sanitation). The practical possibility
of construction of the centralized sanitation in rural conditions is limited, from one side by
the financial capabilities of local governments and scarce investments from the central budget,
from the other side by the numerous technical issues encountered during designing, construction
and operation of such systems. The spatially scattered build-up areas, low population density,
significant monthly, weekly and daily wastewater discharge irregularity, disadvantageous terrain
configuration and large distances results in considerable problems during sanitation systems designing,
construction and operation. Taking into account the possibility of co-founding the rural
sanitation systems by EU founds and necessity of incurring the considerable costs by local governments
of sustaining the sanitation systems, it seems reasonable that each investment should be
carefully analyzed economically already on the stage of the design.
This paper contains the presentation and description of the most popular simple and dynamic
methods of economic assessment of the investment and application of the presented methods to
concept designing of sanitary wastewater system for the rural community. The following simple
and dynamic methods of economic assessment of investment were applied in our study: yearly
excess value, rate of profit and period of return as well as Net Present Value (NPV), Benefit-Cost
Ratio (BCR) and Dynamic Generation Cost (DGC). The practical application of the presented
economic methods into the designing procedure was performed for the conceptual design of sanitation
system for Baranów community, Lubelskie Voivodeship, Poland. The economic analyses
were performed basing on designing calculations, preliminary costs estimations and assumed
operation costs. The attempt of assessment of the applied economic analyses methods was also
included into our studies.
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