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Some tables of the model, such as the one relating to hydraulic 
use, contain data having no georeferentiation, but functions as 
accessory data to others. 
The construction of competences areas was made starting from 
data collected using, for example, the following criteria: 
> Health care areas: some polygonal were detected on 
the area, based on data extracted from diagnostic 
documents relating to which people use which 
infrastructures. This generates some ambiguity: 
% Some areas intersect reciprocally: people do not 
automatically use the nearest infrastructure, the 
choice is often influenced by certain variables; 
% Some villages are included in more than one 
area: not all residents of a village use the same 
infrastructure. This is not a condition that heavily 
influences the distribution of data. An 
approximation was made around it. 
» Hydraulic areas: were defined with the buffer 
procedure, around central hydraulic infrastructures: 
The criteria adopted were: 
* Available data gave us a competence radius 
value for each infrastructure; 
* With regard to water transportation problems it is 
important to evaluate equidistance from a point. 
Then some simple operations were developed to estimate the 
under or over use conditions of resources connected to 
infrastructures. 
By hydraulic infrastructures we mean water resources, that is 
extraction capacity. Health care resources are represented by 
services offered by clinics and doctors’ surgeries. Finally, 
school resources are educational buildings and teachers. 
The final results of the work, that allow the preceding 
evaluations, are extracted from the GIS with interrogation 
forms. 
Three principal interrogation procedures were developed: 
1. Hydraulic resources: the steps followed, illustrated in the 
pictures, are: 
> Location of each competence area from data; 
  
  
  
  
Figure 9: Location of competence area 
H 
> Selection of each village included in the area with 
selection instruments; 
SS 
  
  
  
Figure 10: Villages selection 
Calculation of population living in this area using 
calculation instruments on population data; 
  
  
  
  
  
  
Figure 11: Population calculate 
Comparison between use data obtained with calculate 
procedure on total population parameter jet calculated 
and extraction delivery of hydraulic infrastructure 
from the stratum. The gap between two values is 
calculated and visualized in red color scale above the 
areas, and represents an estimation of under or over 
use of hydraulic infrastructure. 
  
  
  
Figure 12: Data comparisons