Page 18 - Microsoft Word - 20120528 Unesco study

A disadvantage of the combined daily flood records and the delineated flood extent provide
information about geographic distribution and frequency of inundated areas within the last 10
months is that the results cannot be generalized to longer periods. No data is available about
the exceeding probability of the individual events, therefore it is unknown if the calculated
extent and frequency is representative within the Tabasco region. Furthermore, since no
inundation depths are provided, the actual impact level of the consequences is uncertain;
lower and higher inundation levels are treated similarly in relation to the consequences of any
inundated road network.

2.3.2 Land use data
The land use data covers all the valuable data regarding the soils, traffic information and other
important parameters which have an influence on the economic effects of different road
systems.
This data is divided in the following topics:
- Soil types.
- Altitude in the region.
- Road infrastructure.

Soil types
A lot of regions will have a rich variation of soil types with a wide variation in specific
parameters. This is also the case for the Tabasco region. The soil types in the region will be
reclassified to conform to a system which is suitable for macro-economic effects.
Therefore the parameters of the soil which are influential are determined. The important
parameters are summarized as follows;
- The bearing capacity.
- The chemical properties.
- Grain distribution.
- Liquid limit.

Bearing capacity
The bearing capacity of the soil is important in determining the pavement thickness of a
traditional construction as well a construction using PowerCem technology.

Chemical properties
The chemical properties of a soil have an influence on the mix composition of a PowerCem
construction. The amount of organic matter is important when determining the dosage of
RoadCem and cement.

Grain size distribution
The grain size distribution is one method to check the type of a soil. There are a several
classification systems which use the grain size distribution classification of a soil. In this
research the USCS systematic will be used. Using the USCS systematic the soil types will be
classified in four main classes.

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