# _loaddata.rdb (tab-delimited ASCII file )
# Date created: 
#
# Water-quality load data for sites in 
#
# This file contains estimated loads for nontidal sampling sites
# sites where major forms of nutrient (nitrogen and phosphorus) and 
# sediment were sampled.
#
# The selection of water-quality data from nontidal sites for inclusion
# in the database was based on the following minimum criteria (Langland and
# others, 1995):
#
#     - Nutrient- and sediment-concentration data collected between 
#       October 1, 1971, through December 31, 1996.
#
#     - A minimum of 12 nutrient- and sediment-concentration samples
#       representing fall, winter, spring, and summer conditions 
#       collected throughout any consecutive 3-year time span.
#
#     - Nutrient- and sediment-concentration data available in digital format.
#
# The selection of sites where loads were estimated was based on the following
# minimum criteria (Langland and others, 1995):
#
#     - Non-tidal site satisfies minimum criteria for inclusion as a
#       water-quality site (see above).
#
#     - At least 50 nutrient or sediment samples were collected at the site
#       over at least 3 years, regardless of the availability of
#       continuous streamflow data. 
#
#     - If water-quality data were collected within 1,500 yards of a 
#       continuous streamflow station, both sites were examined on topographic
#       maps to determine if the streamflow data were suitable to 
#       estimate loads for the water-quality site.
#
# REFERENCE: Langland, M.J., Lietman, P.L., and Hoffman, S.A., Synthesis of 
#            nutrient and sediment data for watersheds within the 
#            Chesapeake Bay Drainage Basin, 1995, U.S. Geological Survey
#            Water-Resources Investigations Report 95-4233, p. 6.
#
# Contacts: Michael J. Langland, langland@usgs.gov
#
# For more information, visit the USGS Chesapeake Bay Activities Web Page at:
# http://chesapeake.usgs.gov/chesbay/ .
#
# Field descriptions:
#
#  Column   Description                              Type    Length
#
#  staid    Station number                           char    15
#  agency   Agency code                              char    10
#  pcode    Parameter code                           char    5
#  year     Year                                     char    4
#  load     Estimated load, in tons per year         num     8
#  yield    Estimated yield, in lbs per acre         num     8
#  Type     Sample type                              char    1
#  Error    Model error                              num     8
#
# Sample type refers to the monitoring program and relation to
# to sampled flow, either fixed (F) which generally sampled mediam to low
# flows or total (total) which sampled a broader range of flow with number
# of storm or high flow samples. 

staid 	agency	pcode	year	load	yield	type	error
15N	10N	5N	4N	8N	8N	1N	8N