Studies of the impact of the discharge of stormwater from the new river mouth of the stream Vega on the AySA Water Intake Tower in the coastal area of the Río de La Plata. Hydrometric measurements and quality sampling in conduits during rain events, characterization of the stormwater and dispersion studies through mathematical modeling. Design of a work to deflect the flow in the discharge.
STUDY OF THE IMPACT OF THE NEW DISCHARGE FROM THE VEGA STREAM ON THE WATER INTAKE TOWER OF AYSA TT3 AND WORK DESIGN
The Stream Vega relief tunnel in the city of Buenos Aires, under construction, locates its discharge at a point near the AySA Water Intake Tower in the Rio de La Plata, identified as TT3 (Intake Tower N ° 3) that supplies the San Martín water treatment plant in the city of Buenos Aires.
As a result of this, studies were carried out on the impact of this discharge of stormwater and stormwater-sewage and subsequently the design of the necessary works to mitigate the impact on the quality of the water to be captured by the intake.
Field and laboratory work were carried out in order to quantify the degree of contamination present in stormwater, particularly at the beginning of rain events (first flush). Measurements and samplings were implemented in the Vega, Medrano and White stormwater conduits by means of an unprecedented system, consisting of the automatic measurement of levels and velocities and the sampling of water by means of a pumping system activated remotely based on the growth of the levels inside the conduits.
Mathematical modeling techniques were applied to evaluate the impact produced on the raw water that can be captured by the intake tower, considering different combinations of discharge of rainfall hydrographs with tidal situations of the Río de la Plata. The Delft-3D tool was used in its Flow and D-Water Quality (WAQ) modules.
The work designed in the discharge finally consisted of a deflector structure that derives the entire flow in a direction parallel to the coast, with a northwest direction.