As part of an overall effort to alleviate the amount of storm water related pollution in New York Harbor, the City of New York has made extensive efforts to limit the amount of storm water runoff. As part of this effort the City has instituted a program of Bioswale creation in hardscaped locations across the five boroughs which have been identified as generating excessive runoff. B. Thayer Associates was contracted to perform the pre-design survey on over 600 sites across Brooklyn and Queens.
To accomplish this, B. Thayer’s surveyors set an extensive network of survey control points using redundant RTK GPS observations. Once this control network was referenced to Borough control and the local street network, a detailed topographic survey was performed at each of the proposed bioswale locations. This survey included all existing features in the area of the proposed bioswale and all utilities that crossed the proposed locations. Once this data was collected in the field B. Thayer office technicians generated topographic maps used as base mapping for the design of each bioswale.