Table 2. Correlation results for each method.

		Discharge capacity and estimated population		Discharge capacity and population density		Discharge capacity and sewershed area
Method	Median discharge capacity (mgd)	Pearson correlation	P value	Pearson correlation	P value	Pearson correlation	P value
Provided by treatment plant/municipality/county	0.36	0.83	0	0.439	0	0.826	0
Parcel digitized no description	0.52	0.876	0	0.514	0	0.853	0
Parcel digitized from description	0.99	0.974	0	0.615	0.005	0.853	0
Digitized from physical map (JPEG/PDF)	10	0.972	0	0.673	0	0.698	0
Digitized from manhole/sewer main shapefile	0.4	0.707	0	0.195	0.27	0.668	0
Parcel digitized from DANC records	0.1	0.897	0	0.544	0	0.822	0