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Online Guide to MODFLOW

Navigation: Conduit Flow Process

CRCH - Conduit Recharge File

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Abbreviation in Name file



The CRCH Package routes a fraction of the diffuse areal recharge (assigned in the traditional MODFLOW RCH Package) into nodes of conduit pipes. This functionality may be useful in scenarios where rainfall runs directly into karst features, such as sinkholes or swallets. If activated for CFPM1 or CFPM3 simulations, the CRCH Package can route a fraction or all of the diffuse areal recharge into a specified conduit node. The routed direct recharge will be subtracted from the diffuse recharge for MODFLOW water-budget calculations. Note the RCH Package must be active when the CRCH Package is active. This file is only used for CFP Modes 1 and 3.


Shoemaker, W.B., Kuniansky, E.L., Birk, S., Bauer, S., and Swain, E.D., 2007, Documentation of a Conduit Flow Process (CFP) for MODFLOW-2005: U.S. Geological Survey Techniques and Methods, Book 6, Chapter A24, 50 p.

Related Packages

Conduit Output Control File (COC)

Conduit Flow Process Input File (CFP)

Supported in


Other Notes


Input Instructions

For each simulation and stress period, all variables, char­acters, and arrays in the CRCH Package are read using free format.



Data Set 0


Required comment line —“#” must be in column 1.

Data Set 1

Data Set 2




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