This is a new drawing called an “operations map”, intended to help me systematically analyze and understand the spatial implications of the specific material remediation operations of canal water filtration and sediment dredging. For a while some version of this drawing was embedded in the “action map”, but it grew too messy to be useful.
In this drawing green shows the distribution of composted materials created from the harvesting of floating aquatic plants being used to filter water in the Riachuelo Canal. The lines are scaled to indicate quantities of material being moved, mostly along the street grid, an old rail line (shown by the thick, black, dashed line) and the canal itself. Red indicates the known sewer outfalls; where they are clustered (indicated by the red rectangle) is seen as an ideal site for a major filtration intervention. Brown areas indicate the parks and plazas that will receive the compost. Purple-black indicates the canal itself.
Purple indicates the sediment that will be trapped. The purple lines are scale to indicate quantities of sediment that are trapped in different ways at specific sites- each with a name and estimated quantity. The gray trapezoid in the Rio de la Plata indicates the location and size of the new “camalote” confined disposal facility to be used for port expansion as sediment is disposed. The black round dash indicates the route the barges will take, under the guidance of the Port Authority, to place the contaminated sediment geotubes. The thick white dashed line indicates the current general discharge of sediment and the white dashed arc indicates the area that is contaminated by the discharge. This enlargement of contaminated area adds a huge burden to the operating cost of the Port Dock Sud because all dredging undertaken in that zone- 640,000 m3 per year- must be treated as contaminated waste. One major goal of this project is to reduce that number by 95%. The dredge quantities, periodicities, and types of sediment for each of the three main deposition sites over an 18 month period are indicated by the new graph along the bottom. My calculations are not sufficient to verify this (at all!) but they do indicate that the 95% goal might be possible given a strategy that treats the sediment and contaminated water as a material in its own right, not something to be discharged.
In addition to implicating the port and the canal upstream, the Tierra Plastica project links together all of the public spaces in the Riachuelo drainage basins that have plants through the compost production and distribution system. This is shown in the diagram on the bottom left corner of the page. This creates a third riparian spatial eco-type of a similar scale to the existing Avellaneda Nature Preserve and the Buenos Aires Ecological Reserve. These are the extremely large brown areas at the edge of the drawing. This third type is distributed, heavily worked, and ornamental. All three are highly productive, artificial, potentially dangerous, and tied directly to the waste and excesses of the urban system