What I want to do
September 27, 2014
This note documents Eymund's dye tracing experiments at two sites.
Site 1: new wetlands on edge of the salt lot
Eymund showing that the dye--as proxy for sediment--reveals that constructed wetlands should not exceed 6' from the edge of the bulkhead/bank:
Site 2: hypothesized Vechtes Brook flowing into Gowanus through landfilled 5th Street Basin
Approaching the site --
@bronwen pouring in a gallon of red dye:
Studying flow patterns:
FROM ABOVE: The dye goes in:
The dye is clearly visible from the balloon, which is important for future attempts, but it seems like the path of the canoe disturbs the path of the dye.
We will repeat this experiment with a two tethered balloon held by canoers, but with the dye released by someone standing under the bridge where the inflow can be clearly observed.
Why I'm interested
The discovery of flowing groundwater at the 1st street basin is altering both federal EPA and municipal DEP restoration and management plans. We want to continue research along these lines.