Blossom V1.01 Groundwater Availability Model Boundary Condition Packages. 
Texas Water Development Board Groundwater Modeling Department

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WEL - WELL PKG
blsm_v101_wel.csv
blsm_v101_bc_pkg.gpkg\blsm_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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DRN - DRN PKG
blsm_v101_drn.csv
blsm_v101_bc_pkg.gpkg\blsm_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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GHB - GENERAL HEAD BOUNDARY PKG
blsm_v101_ghb.csv
blsm_v101_bc_pkg.gpkg\blsm_v101_ghb
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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
cond 	| float 	| hydraulic conductance of the interface between the aquifer cell and the boundary for all stress periods
head	| float		| ghb cell head in feet for all stress periods
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RCH - RECHARGE PKG
blsm_v101_rch.csv
blsm_v101_bc_pkg.gpkg\blsm_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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RIV - RIVER PKG
blsm_v101_riv.csv
blsm_v101_bc_pkg.gpkg\blsm_v101_riv
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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
rbot	| float		| elevation of the bottom of the riverbed for all Stress Periods
cond	| float 	| riverbed hydraulic conductance for all Stress Periods
stage	| float 	| head in the river cell for all Stress Periods
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For more information on the variables refer to:
USGS Survey Techniques and Methods 6–A16
MODFLOW-2005, The U.S. Geological Survey Modular Ground-Water Model—the Ground-Water Flow Process

USGS Techniques and Methods 6-A37
MODFLOW-NWT, A Newton Formulation for MODFLOW-2005