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STORAGECOEFFICIENT and Upstream Weighting


Dirk Herding
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Hi, I have storage coefficient (S) instead of specific storage (Ss)…In the LPF Package dialog I can use the STORAGECOEFFICIENT option – really easy. So, now I want to use Newton (NWT) and Upstream Weighting (UPW) and there is no STORAGECOEFFICIENT option. I calculated the layer thickness (layers are convertible) and multiplied it with the storage coefficient. This is really tedious and error-prone. Is there an easier way?

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I just looked at the NWT code and all of those options that are available for LPF with MODFLOW-2005 are also in the UPW package for MODFLOW-NWT. So we need to change GMS to make them available in the UPW package. For now you should be able to save out the MODFLOW files and then just hand edit the UPW package to have the STORAGECOEFFICIENT option.

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I believe that you can edit Dataset 1 in the *.upw file. The current problem in GMS is that we don't allow the user to set this option from the UPW dialog. I have reported this as a bug.

I have not tested this yet but I did look at the source code for NWT and code was there to check for the STORAGECOEFFICENT option.

So try putting the storage coefficient into the dialog instead of specific storage and manually edit the UPW file with STORAGECOEFFICENT and then run NWT. Let me know if this does not work and we can contact the NWT author.

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Hi Alan,
Thanks for the response.

"So try putting the storage coefficient into the dialog instead of specific storage
and manually edit the UPW file with STORAGECOEFFICENT and then run NWT."

What do you mean / which dialog?

I found this:

"Additionally, optional interpretations of the groundwater storage input variable are not supported by the UPW Package.
Consequently, the LPF Package input variable “OPTIONS” is not supported by the UPW Package." (Niswonger et al. 2011)


Dataset1 LPF:
740 -888.0 0 STORAGECOEFFICIENT

Dataset 1 UPW:
740 -888.0 0 0 (original)
-> 740 -888.0 0 STORAGECOEFFICIENT

FILE UNIT 704 : ERROR CONVERTING "STORAGECOEFFICIENT" TO AN INTEGER IN LINE:
40 -888.0 0 STORAGECOEFFICIENT




The name file below....
The only chance for setting STORAGECOEFFICIENT is the UPW? Therefore I do not understand
what you mean with the dialog...



# MF2K NAME file
# REFTIME s 1 1960 1 1 0 0 0
#
# MODFLOW NWT
# Output Files
LIST 702 "TransientModel_devUpSys_OwAll_nwt.out"
DATA(BINARY) 730 "TransientModel_devUpSys_OwAll_nwt.hed"
DATA(BINARY) 735 "TransientModel_devUpSys_OwAll_nwt.drw"
DATA(BINARY) 740 "TransientModel_devUpSys_OwAll_nwt.ccf"
LMT6 718 "TransientModel_devUpSys_OwAll_nwt.lmt"
#
# Obs-Sen-Pes Process Input Files
HOB 751 "TransientModel_devUpSys_OwAll_nwt.hob"
CHOB 755 "TransientModel_devUpSys_OwAll_nwt.chob"
#
# Obs Process Output File(s)
DATA 775 "TransientModel_devUpSys_OwAll_nwt._os"
ASP 771 "TransientModel_devUpSys_OwAll_nwt.asp"
#
# Global Input Files
DIS 719 "TransientModel_devUpSys_OwAll_nwt.dis"
#
# Flow Process Input Files
BAS6 703 "TransientModel_devUpSys_OwAll_nwt.ba6"
UPW 704 "TransientModel_devUpSys_OwAll_nwt.upw"
OC 715 "TransientModel_devUpSys_OwAll_nwt.oc"
RCH 716 "TransientModel_devUpSys_OwAll_nwt.rch"
WEL 709 "TransientModel_devUpSys_OwAll_nwt.wel"
ETS 765 "TransientModel_devUpSys_OwAll_nwt.ets"
CHD 713 "TransientModel_devUpSys_OwAll_nwt.chd"
NWT 714 "TransientModel_devUpSys_OwAll_nwt.nwt"

Edited by Dirk Herding
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Here is dataset1 in a upw file that worked for me:

740 -888.0 0 0 STORAGECOEFFICIENT

In the *.out file this was printed:

STORAGECOEFFICIENT OPTION:
Read storage coefficient rather than specific storage Option not supported in UPW Package for MODFLOW-NWT

Here is the version of NWT I used:

MODFLOW-NWT-SWR1
U.S. GEOLOGICAL SURVEY MODULAR FINITE-DIFFERENCE GROUNDWATER-FLOW MODEL
VERSION 1.0.9 07/01/2014
BASED ON MODFLOW-2005 VERSION 1.11.00 08/30/2013
This is the version shipped with GMS 10.0.
"dialog" means the UPW Package Options dialog. This dialog is accessed by clicking on the "More UPW Options" button in the UPW Package dialog.
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