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GENERIC STEP-BY-STEP APPROACH STEP THREE

Greenfields approach

A Greenfield’s approach determines the optimum provisioning and location of service points considering
the:

 Population size and density.

 Capacity parameters of your different types and sizes of facilities.

 Geographic access standards of your department.
 Existing movement network including national, secondary, tertiary roads and footpaths.

The accessibility modelling applies multiple levels of analysis to identify optimal sites for service points.
It begins by locating optimal sites based on where the largest concentrations of beneficiaries are
located. Facilities are continually added until all optimally located sites have been identified. The aim
is to maximise service delivery coverage for beneficiaries by increasing the percentage of people
reached within the study area and providing services as close as possible to where people live.

As each of the facilities is added, the model takes into consideration competition between service
points for beneficiaries situated nearby. The location of facilities is continually adjusted to ensure
that beneficiaries are allocated to their closest service point.

As a hypothetical example, different sizes of schools will have different sets of population parameters. The
modelling software first considers the population parameters for large schools in the Greenfield’s analysis
before it considers the location of medium and small primary schools in the remaining areas.

Figure 24 illustrates the use of Greenfield’s analysis to locate optimal sites for different sizes of primary
schools in Umzinyathi District. A 3km travel distance is used and the population parameters are 135 – 310
learners for small, 311 – 620 learners for medium, and 621 – 930 learners for large schools.

Figure 24: Map illustrating the use of Greensfield’s analysis for primary schools in Umzinyathi District
(Africascope 2009)

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