Document ID: EPA-HQ-OW-2008-0465-2113
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2009-12-18T05:00Z

Construction and Development Spatial Data Processing Results

QA/Verification compiled database table

June 26, 2009

Table   SEQ Table \* ARABIC  1 . Final QA tracking of data layers for
urban masking processing

	STATSGO Related Factors	Checked Version of QA evaluated layers in
compilation is correct

1	K factor	MM 6/25/09

2	Hydrologic Group	MM 6/25/09, Fractions adjusted to 100%

3	Slope	MM 6/25/09

4	Soil Fraction (% clay/sand/silt)	MM 6/25/09, Fractions adjusted to
100%

5	R Factor	MM 6/25/09

	Precipitation

	6	PRISM Annual Average Precipitation (in) 	MM 6/26/09

	Development

	7	Annual Development Rate	MM 6/25/09(9 year average rate
590,357acres/yr)

Updated Counts in Final DB Table

Notes on Construction and Development Compiled database

Number of ERF1.2 watersheds: 61,214

Number of ERF1.2 watersheds crossing at least 2 state boundaries: 4,253

Number of unique State/ERF1.2 watersheds: 65,573

Number of unique State/ERF1.2 watersheds with land use change data:
42,629

Number of unique State/ERF1.2 watersheds with zero land use change data
from USGS watershed analysis: 71