| Introduction |
| Frequently Asked Questions |
| Package Incompatibilities |
| Suggestions on Compiling |
| Miscellaneous |
| Name File |
| Array Reading Utility Modules |
| List Utility Module |
| Input Files Supported in Various Versions of MODFLOW |
 | Ground-Water Flow Process |
| BAS6 - Basic Package |
| DIS - Discretization File |
| MULT - Multiplier File |
| ZONE - Zone File |
| PVAL - Parameter Value File |
| Ground-Water Flow Packages |
| BCF6 - Block-Centered Flow Package |
| LPF - Layer-Property Flow Package |
| HUF2 - Hydrogeologic Unit Flow Package |
| KDEP - Hydraulic-Conductivity Depth-Dependence Capability |
| LVDA - Model-Layer Variable-Direction Horizontal Anisotropy Capability |
| HFB6 - Horizontal Flow Barrier Package |
| UZF - Unsaturated-Zone Flow Package |
| Boundary Condition Packages |
| Specified Head Boundaries |
| CHD - Time-Variant Specified-Head Package |
| FHB - Flow and Head Boundary Package |
| Specified Flux Boundaries |
| FHB - Flow and Head Boundary Package |
| RCH - Recharge Package |
| WEL - Well Package |
| Head-Dependent Flux Boundary Packages |
| DAF, DAFG - DAFLOW with MODFLOW |
| DRN - Drain Package |
| DRT- Drain Return Package |
| ETS - Evapotranspiration Segments Package |
| EVT - Evapotranspiration Package |
| GHB - General-Head Boundary Package |
| LAK - Lake Package |
| MNW1 - Multi-Node, Drawdown-Limited Well Package |
| RES - Reservoir Package |
| RIV - River Package |
| SFR - Streamflow-Routing Package |
| STR - Stream Package |
| UZF - Unsaturated Zone Flow Package |
| Solvers |
| DE4 - Direct Solver Package |
| GMG - Geometric Multigrid Solver |
| LMG - Link-AMG Package |
| PCG - Preconditioned Conjugate-Gradient Package |
| SIP - Strongly Implicit Procedure Package |
| SOR - Slice-Successive Overrelaxation Package |
| Output Control |
| GAGE - Gage Package |
| HYD - HYDMOD Package |
| LMT6 - Link-MT3DMS Package |
| OC - Output Control Option |
| Subsidence |
| IBS - Interbed-Storage Package |
| SUB - Subsidence and Aquifer-System Compaction Package |
| SWT - Subsidence and Aquifer-System Compaction Package for Water-Table Aquifers |
| Observation Process |
| ADV2 - Advective-Transport Observation Input File |
| CHOB - Specified-Head Flow Observation Input File |
| DROB - Drain Observation Input File |
| DTOB - Drain Return Observation Input File |
| GBOB - General-Head-Boundary Observation Input File |
| HOB - Head-Observation Input File |
| OBS - Input File For All Observations |
| RVOB - River Observation Input File |
| STOB - Stream Observation Input File |
| Sensitivity Process |
| SEN - Sensitivity Process Input File |
| Parameter Estimation Process |
| PES - Parameter-Estimation Process Input File |
2008 U.S. Geological Survey