- The object of the Project “Submarine Outlet (Drainage Pipe) for the Discharge of Sea Water Proceeding from the Desalination of Sea Water from the Stella Canaris Urbanisation, Matorral Beach. Municipal District of Pájara” consisted of defining the work necessary to return the water rejected by the Stella Canaris Urbanisation Desalination Plant, as well as evaluating the effects that this has on the marine and coastal environment, and defining the parameters of the pipeline to adapt it to the demands of the Instruction for the Project for Pipelines for Discharge from Land into the Sea, which establishes the conditions to authorise discharge through pipelines.
- A drainage pipeline was chosen for the discharge of sea water coming from the desalination plant, and for this, this pipeline was designed which would be buried along all its length, as well as the flotation weights needed for the installation, two supplementary weights for each 4 m of pipeline in the breakwater zone and one outside it.
- The pipeline has a total length of 1,335 metres, taking into account the land and submarine section, and is formed of a high density polyethylene tube, of 250 mm in external diameter and a nominal pressure of 4 atm.
- The land section is formed of a tube of 723,70 metres.
- The submarine section is formed of a tube of 611.30 metres, including the diffuser section.
- The diffuser section is formed of a tube of 15 metres in length of high density polyethylene variable external diameters of 250 and 200 mm. It comprises 6 diffusers, of 90 mm in external diameter.
- The final point of discharge of the drainage pipe is located at the bathymetric level of 8.20 metres, measured against the maximum equinox low tide).
- For the dimensioning of the drainage pipe, a peak flow of 36 l/s was considered.
- The occupation surface area of the maritime-coastal public domain to be acted on for the outlet was set at a total of 611.30 m2.