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EARTHWORKS FOR THE STATION

OPTIMIZE THE EMBANKMENTS OR THE HYDRAULIC SYSTEM?

 

CHALLENGE

Design the earthwork and the hydraulic system for rainwaters and oily waters for one of the largest pumping stations ever projected for Colombia in the jurisdiction of the Casanare Department.

The conditions relating the project, such as the extensive operational areas (63 ha), a flat topography (slopes between 1% - 5%), high rainfall intensities during the rainy season (high flows rates in a short time) and a  high flood mark in the dumping pool, established a challenging scenario for the design due to the geomorphological conditions of the area, summarized in the economic need of minimizing the earthworks as well as maximizing the operative areas and, if possible, discharge the rainwater drainage system by way of pumps. 

SOLUTION

Antea®Group conducted a sensitivity study that allowed a better understanding of the fluctuating earthwork volumes as the impressive design variables were being modified, such as the type of hydraulic system required to manage the rainwater (gravity, pumped and mixed), the runoff slopes and moving the disposal site of such waters into the body of water adjacent to the station. 

RESULT

It was possible to optimize the originally planned earthworks by more than 50% and, in turn, implement a hydraulic system to manage rainwater only by gravity. 

Such optimization was achieved through short circuits of gutters connected with perimetric canals that merged into a large dissipation structure, which would allow the proper disposal of rainwaters into the body of water.

This outcome fully met the customer’s expectations, and avoided the acquisition of twice the volume of stone materials for the embankment and the purchase of pumping equipment for the rainwater system. In like manner, it involved the total suspension of costs associated with the operation and maintenance of such rainwater pumping equipment.