Environmental Engineering Reference
In-Depth Information
Fig. 3
CTA location
more compatible with flood drainage in CTA than in Ota. This situations leads to
much easier construction works for the CTA case.
Comparison of the Costs of Measures for Impact Mitigation
The costs of the intervention on the transformation of river network at both loca-
tions are mainly related with the flood drainage.
At Ota, the main work is to change the course of the Alvarinho River, by build-
ing a large dam upstream of the airport platform and transferring the water from the
Ota River to the Alenquer River. The intervention in CTA is quite simple; it requires
the construction of channels following the contour of the airport platform at the
East and West sides. Consequently, it was estimated that the Ota flood water works
would cost about 13.4 M€ while the cost for CTA would reach 0.9 M€.
Conclusions and Recommendations
The study undertaken supplied objective quantitative and qualitative data that indi-
cated that the location CTA is significantly better than the Ota alternative, concern-
ing surface water resources analysis. During the course of the study, some issues
