Seymour/Blaine Groundwater Availability Model V1.01 Boundary Condition Packages. 
Texas Water Development Board Groundwater Modeling Department

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WEL - WELL PKG
symr_v101_wel.csv
symr_v101_bc_pkg.gpkg\symr_v101_wel
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cellid 	| integer 	| Format:  layer + rrrr + cccc (0-3 leading zeros for row and cols). Example: 200230245 (layer = 2, row = 23, col = 245)
lay 	| integer 	| Layer number
row 	| integer 	| Row number 
col 	| integer 	| Column number
ibound 	| integer 	| ibound number
q1	 	| float 	| pumping for stress period 1
qN 		| float 	| pumping for stress period N
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RCH - RECHARGE PKG
symr_v101_rch.csv
symr_v101_bc_pkg.gpkg\symr_v101_rch
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cellid 	| integer 	| Format:  layer + rrrr + cccc (0-3 leading zeros for row and cols). Example: 200230245 (layer = 2, row = 23, col = 245)
lay 	| integer 	| Layer number
row 	| integer 	| Row number 
col 	| integer 	| Column number
ibound 	| integer 	| ibound number
rech1	| float 	| recharge for stress period 1
rechN	| float 	| recharge for stress period N
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DRN - DRAIN PKG
symr_v101_drn.csv
symr_v101_bc_pkg.gpkg\symr_v101_drn
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cellid 	| integer 	| Format:  layer + rrrr + cccc (0-3 leading zeros for row and cols). Example: 200230245 (layer = 2, row = 23, col = 245)
lay 	| integer 	| Layer number
row 	| integer 	| Row number 
col 	| integer 	| Column number
ibound 	| integer 	| ibound number
elev 	| float 	| drain elevation for all stress periods
cond 	| float 	| drain conductivity for all stress periods
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EVT - EVAPOTRANSPIRATION PKG
symr_v101_evt.csv
symr_v101_bc_pkg.gpkg\symr_v101_evt
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cellid 	| integer 	| Format:  layer + rrrr + cccc (0-3 leading zeros for row and cols). Example: 200230245 (layer = 2, row = 23, col = 245)
ievt 	| integer 	| layer number recharge is applied to
row 	| integer 	| Row number 
col 	| integer 	| Column number
ibound | integer 	| ibound number
surf1	| float 	| elevation of ET surface for all stress periods
evtr1	| float 	| max ET flux rate for SP 1
evtrN	| float 	| max ET flux rate for SP N
exdp1	| float 	| ET extinction depth for SP 1
exdpN	| float 	| ET extinction depth for SP N
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STR - STREAM PKG
symr_v101_str.csv
symr_v101_bc_pkg.gpkg\symr_v101_str
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cellid 	| integer 	| Format:  layer + rrrr + cccc (0-3 leading zeros for row and cols). Example: 200230245 (layer = 2, row = 23, col = 245)
ievt 	| integer 	| layer number recharge is applied to
row 	| integer 	| Row number 
col 	| integer 	| Column number
ibound 	| integer 	| ibound number
segment	| integer 	| elevation of ET surface for all stress periods
reach	| integer 	| max ET flux rate for SP 1
stage	| float 	| is the stream stage. The value of Stage is not used if ICALC>0. Stage is measured relative to the same datum as the rest of the model.  It is not measured relative to the stream bottom.
cond	| float 	| is the streambed hydraulic conductance.
sbot	| float 	| is the elevation of the bottom of the streambed.
stop	| float 	| is the elevation of the top of the streambed. The value of Stop is used if the option to calculate stream stage is active (ICALC>0) or when the streambed has zero flow.
width	| float 	| is the width of the stream channel. It is read only when stream stage is calculated (ICALC>0).
slope	| float 	| is the slope of the stream channel. It is read only when stream stage is calculated (ICALC>0)
rough	| float 	| is Manning’s roughness coefficient. It is read only when stream stage is calculated (ICALC>0).
flow1	| float 	| is the streamflow entering a segment for Stress Period 1. This value is used only for the first reach of each segment. The value should be specified as either 0 or blank when the reach number (Reach) is not 1. When the inflow to the first reach of a segment is the sum of the outflow from upstream tributary segments, Flow should be specified as -1. When the segment is a diversion, the Flow for the first reach is the amount to divert; however, there will be no diversion if the segment from which the diversion is obtained contains less than the value of Flow.
flowN	| float 	| is the streamflow entering a segment for Stress Period N. This value is used only for the first reach of each segment. The value should be specified as either 0 or blank when the reach number (Reach) is not 1. When the inflow to the first reach of a segment is the sum of the outflow from upstream tributary segments, Flow should be specified as -1. When the segment is a diversion, the Flow for the first reach is the amount to divert; however, there will be no diversion if the segment from which the diversion is obtained contains less than the value of Flow.
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For more information on the variables refer to:
USGS Open-File Report 00-92
MODFLOW-2000, The U.S. Geological Survey Modular Ground-Water Model - User Guide to Modularization Concepts and the Groundwater Flow Process