The Town of Babylon is seeking to conduct an engineering study to analyze, prioritize, and evaluate potential infrastructure improvements along Carlls River in order to reduce flooding in communities adjacent to the river corridor, as identified in the Village of Babylon and West Babylon, NY Rising Community Reconstruction (NYRCR) Plan.
B. Thayer Associates was contracted to produce drawings depicting basic cross sections of the Carlls River channel (i.e. top of bank, bottom of bank, and thalweg, which is the deepest part of the channel) together with sufficient overbank details to verify the typical channel dimensions from north of Elda Lake to Argyle Lake at approximately every 200 feet.
Our survey team referenced North American Datum of 1983 (NAD-83) and North American Vertical Datum of 1988 (NAVD-88) of the New York State Plan coordinate system to establish horizontal and vertical controls utilizing Real Time Kinematic (RTK) Global Positioning System (GPS) technology. Channel sections were measured by conventional traverse and side-shot techniques.