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Icon  Name                                  Last modified      Size  Description
[PARENTDIR] Parent Directory - [TXT] about.txt 2017-10-24 04:30 2.2K Text, ASCII format [TXT] adrese.txt 2017-10-24 04:30 32 Addresses, URL [   ] MODFLOW-NWT-SWR_TestProblems.exe 2017-10-24 04:33 14M Executable binary [   ] SWRPre_Installation.exe 2017-10-24 04:31 4.0M Executable binary [TXT] SWRProcess_release.txt 2017-10-24 04:30 4.4K Text, ASCII format [   ] tm6-a46.pdf 2017-10-24 04:26 6.7M Digital document (Acrobat)
Surface-Water Routing (SWR) Process for Modeling Surface-Water Flow 
with the USGS Modular Groundwater Flow Model (MODFLOW)

The Surface-Water Routing (SWR) Process was developed to accurately 
simulate stages, surface-water flows, and surface-water/groundwater 
interactions in areas where surface-water gradients are small and (or) 
there is significant management of surface water. A simplified form of 
the Saint-Venant equations was implemented in the SWR Process based on 
assumption requirement that it will be applied to continuous 
simulations (hourly to daily time steps) in support of water-resource 
planning activities. As a result, the SWR Process was not intended as a 
replacement for hydrodynamic models that solve the full Saint-Venant 
equations and are applied to event simulations (sub-hourly time steps).

The SWR Process uses a flexible approach for simulating one- and 
two-dimensional routing of surface-water flow. The SWR Process is 
implicitly coupled to the Groundwater Flow Process in MODFLOW. 
Surface-water routing in SWR can be simulated using a diffusive-wave 
approximation of the vertically-integrated Saint-Venant equations 
and/or a simplified level-pool approach. SWR can account for 
surface-water flow controlled by backwater conditions caused by small 
water-surface gradients or surface-water control structures. A number 
of typical surface-water control structures (such as culverts, weirs, 
and pumps, for example) can be represented, and simple operational 
rules can be specified to manage surface-water stages and streamflow by 
moving water from one surface-water feature to another. The non-linear 
surface-water flow equations implemented in the SWR Process are solved 
using Newton methods and direct or iterative solvers.

The SWR Process uses the familiar structure of MODFLOW-2005 and the 
MODFLOW concepts of "packages" and "processes" are retained. This 
permits versions of MODFLOW-NWT and MODFLOW-2005 that include the SWR 
Process to work with many of the MODFLOW-related software programs, 
such as MODPATH, ZONEBUDGET, and parameter estimation programs. 
MODFLOW-NWT and MODFLOW-2005 with the SWR Process are public domain 
computer programs. The source code and software are distributed free of 
charge by the USGS.

Lapas adrese: priede.bf.lu.lv/ftp/pub/TIS/datu_analiize/ModelMuse/SWR

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