Edwards-Trinity (Plateau) V101 Groundwater Availability Model Boundary Condition Packages. 
Texas Water Development Board Groundwater Modeling Department

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DRN - DRAIN PKG
eddt_p_v101_drn.csv
eddt_p_v101_bc_pkg.gpkg\eddt_p_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
eddt_p_v101_ghb.csv
eddt_p_v101_bc_pkg.gpkg\eddt_p_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 	| ghb cell conductivity for all stress periods
head	| float		| ghb head for all stress periods
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WEL - WELL PKG
eddt_p_v101_wel.csv
eddt_p_v101_bc_pkg.gpkg\eddt_p_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
eddt_p_v101_rch.csv
eddt_p_v101_bc_pkg.gpkg\eddt_p_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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STR - STREAM PKG
eddt_p_v101_str.csv
eddt_p_v101_bc_pkg.gpkg\eddt_p_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)
lay 	| integer 	| Layer number
row 	| integer 	| Row number 
col 	| integer 	| Column number
ibound 	| integer 	| ibound number
segment	| integer 	| is a number assigned to a group of reaches. Segments must be numbered in downstream order and are read into the program in sequential order.
reach	| integer 	| is a sequential number in a segment that begins with 1 for the farthest upstream reach and continues in downstream order to the last reach in the segment. Reaches must be read in sequentially because the order in which reaches are read determines the order of connection.
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.
flow	| float 	| is the streamflow entering a segment. 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.
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).
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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