Population Projection
When making population projections, the following points should be kept in mind:
- Population projection studies are usually quite complex. All must be analyzed
the variables (unfortunately not always quantifiable) that may interact in the specific location in
analyze. Even so, unexpected events may occur that completely change the predicted trajectory.
for population growth. This underscores the need to establish a realistic value
for the project horizon, as well as the implementation of the station in stages
- The mathematical sophistications associated with determining the parameters of some equations of
population projections lose their meaning if they are not supported by parallel information, mostly
sometimes non-quantifiable, such as social, economic, geographic, historical aspects, etc
- The analyst's common sense is of great importance in choosing the projection method to be adopted and in the
interpretation of results. Although the choice may be based on the best fit to the data
census data available, extrapolation of the curve requires perception and caution
- The latest census data in Brazil have indicated a general trend (naturally with
localized exceptions) of reduction in annual population growth rates
- It is interesting to consider the inclusion of a certain margin of safety in the estimate, in the sense of
that future real populations will not, unless from some strong unforeseeable cause, easily
exceed the estimated project population, inducing early overloads in the implanted system
For the calculation of 
Pressure Networks and
Sewage Networks, you must do
the calculation of the population projection in order to evaluate the final demands of these networks.
SOLIDOS includes a range of population projection methods. For all of them, consider the following:
- Initial Population (StartPop, Double) - The population served at the beginning of the project
At the start of the plan or the beginning of operations, the development is not yet fully occupied. Therefore, it is necessary to evaluate the minimum tractive stress within the pipes to ensure that sludge flow does not settle and clog the network
- Final Population (EndPop, Double) - The total population served at the end of the occupancy period for the area where the network will be installed
By the end of the plan—or the end of the population growth period—the network may reach saturation; thus, it is necessary to verify the maximum flow depth
The methods are as follows: