Edwards Balcones Fault Zone - Barton Springs V101 Groundwater Availability Model Boundary Condition Packages. 
Texas Water Development Board Groundwater Modeling Department

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HFB - HORIZONTAL FLOW BARRIER PKG
ebfz_b_v101_hfb.csv
ebfz_b_v101_bc_pkg.gpkg\ebfz_b_v101_hfb
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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
layer 	| integer 	| is the number of the model layer in which the horizontal-flow barrier is located.
irow1 	| integer 	| is the row number of the cell on one side of the horizontal-flow barrier.
icol1	| integer	| is the column number of the cell on one side of the horizontal-flow barrier.
irow2	| integer	| is the row number of the cell on the other side of the horizontal-flow barrier.
icol2	| integer	| is the column number of the cell on the other side of the horizontal-flow barrier.
hydchr	| float		| is the hydraulic characteristic of the horizontal-flow barrier. The hydraulic characteristic is the barrier hydraulic conductivity divided by the width of the horizontal-flow barrier.
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DRN - DRAIN PKG
ebfz_b_v101_drn.csv
ebfz_b_v101_bc_pkg.gpkg\ebfz_b_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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WEL - WELL PKG
ebfz_b_v101_wel.csv
ebfz_b_v101_bc_pkg.gpkg\ebfz_b_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
ebfz_b_v101_rch.csv
ebfz_b_v101_bc_pkg.gpkg\ebfz_b_v101_rch
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row 	| integer 	| Row number 
col 	| integer 	| Column number
ibound1 | integer 	| ibound layer 1
irch	| integer	| The layer number that defines the layer in each vertical column where recharge is applied
rech1	| float 	| recharge for stress period 1
rechN	| float 	| recharge for stress period N
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For more information on the variables refer to:
USGS Open-File Report 96-485
User's Documentation for MODFLOW-96, an update to the U.S. Geological Survey Modular Finite-Difference Ground-Water Flow Model