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Surface water
Bernardo Falczuk

The Medrano catchment is located in the extreme north of the city, with a total catchment area of 3.641ha, of which 1813ha are found in the capital city and the other 3569 in the area of the Buenos Aires province.

Its main flow path (currently culverted along its original natural course) is an extension of the open watercourse that runs through the Villa Martelli army fields in the district of Vicente López. It then flows into the city at Sarmiento park, after flowing through the streets; Ruiz Huidobro, Melián, García del Río (through Saavedra park) and Comodoro Rivadavia until it discharges at the Rio de la Plata, traveling a distance of approximately 6km in a southeast-northeast direction.

The drainage network in the province area is different to that of the city because it doesn’t have one collector sewer but has many main branches that drain the following sub-catchments:

· Sub-catchment with a contributing area to the entry point of the main trunk sewer at General Paz.
· Storm water network of Tres de Febrero
· Storm water network of the San Martin district that flows into the Medrano stream in its open air stretch before entering the city.
· Secondary sewer of Constituyentes street and its contributing network.
· Villa Martelli sewer and its contributing network.
· Contributing sub-catchment to the secondary sewer of Holmberg street
· Contributing sub-catchment to the the secondary sewer of Chivilcoy street.

In general terms the drainage network consists of a series of sewers with an average density of approximately 30m/ha. The main trunk sewer of the drainage network is characterized for having nearly rectangular sections with a width that varies between 7 and 20m and an average height in the order of 3.5m. It flows into Rio de la Plata through an open channel with a varying section width of 30m to 300m.

The trunk sewer has a practically constant base gradient of 2 in 1000 until approximately Cabildo Avenue where it begins to decrease to values of in the order of of 1 in 1000. Meanwhile the average gradient of the secondary sewers is in the order of 4 in 1000 at the headwaters, decreasing to 1 in 1000 where it discharges into the culverts of Medrano.

The presence of green areas is small and is limited to approximately 15% of the total catchment area. The Medrano stream catchment is characterized for having its green areas distributed throughout all of its contributing area. This is not the case for the Maldonado and Vega catchments.

The main features that characterize the Medrano stream are due to:

· The existence of a stilling basin in Villa Martelli that corresponds to the open channel section of the Medrano stream.
· The presence of General Paz Avenue with important longitudinal development crossing the entire catchment. This acts as a barrier to overland flow.
· The existence of a hydraulic control from the entry point at the province towards the city. This control consists of a rectangular sewer with a width of 7.2m and a height of 3,2m. This forms a barrier to inflows from the province when flooding occurs.
· The existence of more than one inflow point from the province to the city.



Actualización 2010 patrocinada por:
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