Erdman Anthony was tasked with obtaining as-built data of outfall structures for
the Department of Environmental Resource Management (DERM). For this continuing
survey services contract, DERM provided specific project areas for field
reconnaissance which included using boats and GPS enabled photography to locate
and identify outfall structures along canals, lakes, ponds, and the Intracoastal
Waterway. After the outfall structures were identified from the water, a ground
based recon was performed to determine the terminus of each of the outfall
pipes. Level runs (upwards of 6 miles), meeting NGS Third Order Accuracy
Standards, were performed to establish temporary benchmarks within the project
area to assist with the as-built survey of the individual outfall structures.
As-built requirements included the following items:
Inverts of the structure ends of all barrels;
Water elevation at each structure;
Top of grade elevation;
Type of pipe, material, general condition of pipe and all measurements of
headwalls and non-circular pipes;
and RTK GPS was utilized to obtain horizontal information for all structures
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