diff --git a/etc/clusters/eccc-science.json b/etc/clusters/eccc-science.json
index 941abf4..3934c3f 100644
--- a/etc/clusters/eccc-science.json
+++ b/etc/clusters/eccc-science.json
@@ -1,26 +1,21 @@
 {
     "scheduler": "pbs",
     "specs": {
-        "cpus": 1,
-        "time": "04:00:00",
+        "cpus": 8,
+        "time": "01:00:00",
         "nodes": 1,
-        "partition": "",
-        "account": "",
-        "mem": "8000M"
+        "mem": "16000M"
     },
     "modules": {
         "preload": [
-            "module -q purge",
-            "module -q load StdEnv/2023",
-            "module -q load gcc/12.3"
-        ],
-        "gdal": "module -q load gdal/3.9.1",
-        "cdo": "module -q load cdo/2.2.2",
-        "ncks": "module -q load nco/5.1.7"
-    },
-    "executables": {
-        "gdal": "",
-        "nco": "",
-        "cdo": ""
+		"module -q purge",
+		". ssmuse-sh -x /fs/ssm/main/opt/gcc/gcc-4.9.1"
+	],
+        "compiler": ". ssmuse-sh -x /fs/ssm/main/opt/gcc/gcc-4.9.1", 
+	"mpi": ". ssmuse-sh -x /fs/ssm/main/opt/openmpi/openmpi-2.1.1/gcc--hpcx-1.8",
+	"gdal": ". ssmuse-sh -x /fs/ssm/main/opt/gdal/gdal-3.1.3",
+        "cdo": ". r.load.dot crd/ccrm/main/opt/cdo/cdo_2.1.1_rhel-8-amd64-64",
+        "ncl": ". r.load.dot comm/eccc/all/opt/ncl-ncarg/6.4.0/ncl_6.4.0_all",
+	"nco": " . r.load.dot cmd/cmds/ext/master/nco_5.0.5-3_rhel-8-amd64-64"
     }
 }
diff --git a/etc/schedulers/pbs.json b/etc/schedulers/pbs.json
new file mode 100644
index 0000000..a720855
--- /dev/null
+++ b/etc/schedulers/pbs.json
@@ -0,0 +1,6 @@
+{
+	"environment_variables": {
+		"array_task_id": "$PBS_ARRAY_INDEX",
+		"array_job_id": "$PBS_JOBID"
+	}
+}
diff --git a/etc/schedulers/pbs.m4 b/etc/schedulers/pbs.m4
index 5faf12c..25201fc 100644
--- a/etc/schedulers/pbs.m4
+++ b/etc/schedulers/pbs.m4
@@ -3,8 +3,8 @@
 `#'PBS -l select=__NODES__:ncpus=__CPUS__:mem=__MEM__
 `#'PBS -l walltime=__TIME__
 `#'PBS -N DATA-__SCRIPTNAME__
-`#'PBS -e __LOGDIR__/datatool_$PBS_JOBID-$PBS_ARRAY_INDEX_err.txt
-`#'PBS -o __LOGDIR__/datatool_$PBS_JOBID-$PBS_ARRAY_INDEX.txt
+`#'PBS -e __LOGDIR__/datatool_err.txt
+`#'PBS -o __LOGDIR__/datatool_log.txt
 ifdef(`__ACCOUNT__', `#PBS -A '__ACCOUNT__, `dnl')
 ifdef(`__PARTITION__', `#PBS -q '__PARTITION__, `dnl')
 ifdef(`__EMAIL__',
diff --git a/examples/Casr_land_example.sh b/examples/Casr_land_example.sh
new file mode 100755
index 0000000..f77f3e3
--- /dev/null
+++ b/examples/Casr_land_example.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Meteorological Data Processing Workflow
+# Copyright (C) 2022, University of Saskatchewan
+#
+# This file is part of Meteorological Data Processing Workflow
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This is a simple example to extract ECCC Casr Land (2.1) data for the 
+# South Saskatchewan River Basin (SSRB) approximate extents
+# from Jan 2015 to Dec 2017.
+
+# As is mentioned on the main webpage of the repository, it is
+# recommended to submit annual jobs for this dataset.
+
+# This example is meant to be called from the home directory, as is required by GC Science PBS job submission
+cd datatool
+echo "The current directory is: $(pwd)"
+
+# chunking done on an 'annual' basis
+./extract-dataset.sh  --dataset="casr" \
+  --dataset-dir="/home/gol000/store6/reanalysis/post_processing/casr_land_v2p1_masking/outdir/outnetcdf_all" \
+  --output-dir="$HOME/scratch/casr_land/" \
+  --start-date="2015-01-01" \
+  --end-date="2017-12-30" \
+  --lat-lims=49,54  \
+  --lon-lims=-120,-98 \
+  --variable="CaSR_Land_v2.1_TRAF_Aggregated,CaSR_Land_v2.1_SWE_Land" \
+  --prefix="casrland_21_" \
+  --cluster="./etc/clusters/eccc-science.json" \
+  --email="joel.trubilowicz@ec.gc.ca" \
+  -j;
+
diff --git a/examples/Casr_riv_example.sh b/examples/Casr_riv_example.sh
new file mode 100755
index 0000000..7527c26
--- /dev/null
+++ b/examples/Casr_riv_example.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Meteorological Data Processing Workflow
+# Copyright (C) 2022, University of Saskatchewan
+#
+# This file is part of Meteorological Data Processing Workflow
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This is a simple example to extract ECCC Casr Rivers (2.1) data near the 
+# South Sask River Gauge (WSC 05HG001)
+# from Jan 2015 to Dec 2017.
+
+# As is mentioned on the main webpage of the repository, it is
+# recommended to submit annual jobs for this dataset.
+
+# This example is meant to be called from the home directory, as is required by GC Science PBS job submission
+cd datatool
+echo "The current directory is: $(pwd)"
+
+# chunking done on an 'annual' basis
+./extract-dataset.sh  --dataset="casrriv" \
+  --dataset-dir="/home/shyd500/data/ppp6/casr_rivers_v2p1_postproc/full_domain/" \
+  --output-dir="$HOME/scratch/casr_riv/" \
+  --start-date="2015-01-01" \
+  --end-date="2017-12-30" \
+  --lat-lims=52,52.5  \
+  --lon-lims=-107,-106.5 \
+  --variable="disc" \
+  --prefix="casrriv_21_" \
+  --cluster="./etc/clusters/eccc-science.json" \
+  --email="joel.trubilowicz@ec.gc.ca" \
+  -j;
+
diff --git a/examples/Casrv3p1_example.sh b/examples/Casrv3p1_example.sh
new file mode 100755
index 0000000..50b5814
--- /dev/null
+++ b/examples/Casrv3p1_example.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Meteorological Data Processing Workflow
+# Copyright (C) 2022, University of Saskatchewan
+#
+# This file is part of Meteorological Data Processing Workflow
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This is a simple example to extract ECCC CasrV3.1 data for the 
+# South Saskatchewan River Basin (SSRB) approximate extents
+# from Jan 2015 to Dec 2018.
+
+# As is mentioned on the main webpage of the repository, it is
+# recommended to submit annual jobs for this dataset.
+
+# This example is meant to be called from the home directory, as is required by GC Science PBS job submission
+cd datatool
+echo "The current directory is: $(pwd)"
+
+# chunking done on an 'annual' basis
+./extract-dataset.sh  --dataset="casr" \
+  --dataset-dir="/home/scar700/data/ppp6/CaSRv3.1/postproc_casr4caspar_20250416/link2out4pilot_netcdf/" \
+  --output-dir="$HOME/scratch/casr31_output/" \
+  --start-date="2018-01-01" \
+  --end-date="2018-12-30" \
+  --lat-lims=49,54  \
+  --lon-lims=-120,-98 \
+  --variable="CaSR_v3.1_P_TT_1.5m,CaSR_v3.1_A_PR0_SFC" \
+  --prefix="casrv3.1_" \
+  --cluster="./etc/clusters/eccc-science.json" \
+  --email="joel.trubilowicz@ec.gc.ca" \
+  -j;
+
diff --git a/examples/rdrs_example_ssrb_1980_2018.sh b/examples/rdrs_example_ssrb_1980_2018.sh
index 129203c..e5943ca 100755
--- a/examples/rdrs_example_ssrb_1980_2018.sh
+++ b/examples/rdrs_example_ssrb_1980_2018.sh
@@ -30,15 +30,16 @@ cd ..
 echo "The current directory is: $(pwd)"
 
 # chunking done on an 'annual' basis
-./extract-dataset.sh  --dataset=RDRS \
-  --dataset-dir="/project/rpp-kshook/Model_Output/RDRSv2.1" \
-  --output-dir="$HOME/scratch/rdrs_output/" \
+./extract-dataset.sh  --dataset=CaSR \
+  --dataset-dir="/home/scar700/data/ppp6/CaSRv3.1/postproc_casr4caspar_20250416/link2out4pilot_netcdf" \
+  --output-dir="$HOME/scratch/casr31_output/" \
   --start-date="1980-01-01" \
   --end-date="2018-12-30" \
   --lat-lims=49,54  \
   --lon-lims=-120,-98 \
-  --variable="RDRS_v2.1_P_P0_SFC,RDRS_v2.1_P_HU_1.5m,RDRS_v2.1_P_TT_1.5m,RDRS_v2.1_P_UVC_10m,RDRS_v2.1_A_PR0_SFC,RDRS_v2.1_P_FB_SFC,RDRS_v2.1_P_FI_SFC" \
-  --prefix="rdrsv2.1_" \
-  --email="youremail@company.ca" \
+  --variable="CaSR_v3.1_P_TT_1.5m,CaSR_v3.1_A_PR0_SFC" \
+  --prefix="casrv3.1_" \
+  --cluster="./etc/clusters/eccc_science.json"
+  --email="joel.trubilowicz@ec.gc.ca" \
   -j;
 
diff --git a/extract-dataset.sh b/extract-dataset.sh
index 1f4d57f..38e5fce 100755
--- a/extract-dataset.sh
+++ b/extract-dataset.sh
@@ -550,7 +550,13 @@ function call_processing_func () {
         --arg "ensembleArr" "${ensemble}" \
         --arg "modelArr" "${model}" \
         --arg "scenarioArr" "${scenario}" \
-        '$ARGS.named | with_entries(.value |= split(","))' \
+	'{
+      	  startDateArr: ($startDateArr | split(",")),
+	  endDateArr: ($endDateArr | split(",")),
+          ensembleArr: ($ensembleArr | split(",")),
+          modelArr: ($modelArr | split(",")),
+          scenarioArr: ($scenarioArr | split(","))
+ 	 }'  
       )"
 
     # job chunk variable information
@@ -563,7 +569,15 @@ function call_processing_func () {
         --arg "dateIter" "$dateIter" \
         --arg "ensembleIter" "$ensembleIter" \
         --arg "modelIter" "$modelIter" \
-        '$ARGS.named'
+	'{
+      	  ensembleLen: $ensembleLen,
+	  modelLen: $modelLen,
+	  scenarioLen: $scenarioLen,
+	  dateLen: $dateLen,
+	  dateIter: $dateIter,
+	  ensembleIter: $ensembleIter,
+	  modelIter: $modelIter
+	}'
       )"
 
     # scheduler information
@@ -584,8 +598,14 @@ function call_processing_func () {
         --arg "logDir" "$logDir" \
         --arg "email" "$email" \
         --arg "parsable" "$parsable" \
-        --argjson "specs" "$(jq -r '.specs' $cluster)" \
-        '$ARGS.named + $specs | del(.specs)' \
+	--argjson specs "$(jq '.specs' "$cluster")" \
+	'{
+      	  jobArrlen: $jobArrLen,
+	  scriptName: $scriptName,
+	  logDir: $logDir,
+	  email: $email,
+	  parsable: $parsable
+	} + $specs'
       )"
 
     # job script information
@@ -604,8 +624,18 @@ function call_processing_func () {
          --arg "latLims" "${funcArgs[latLims]}" \
          --arg "lonLims" "${funcArgs[lonLims]}" \
          --arg "prefix" "${funcArgs[prefixStr]}" \
-         --arg "cache" "${funcArgs[cache]}" \
-        '$ARGS.named' \
+	 --arg "cache" "${funcArgs[cache]}" \
+	 '{
+      	   scriptFile: $scriptFile,
+	   datasetDir: $datasetDir,
+	   variable: $variable,
+	   outputDir: $outputDir,
+	   timeScale: $timeScale,
+	   latLims: $latLims,
+	   lonLims: $lonLims,
+	   prefix: $prefix,
+	   cache: $cache
+	 }'
       )"
 
     # job module init information - not JSON as echoed as is
@@ -743,11 +773,15 @@ case "${dataset,,}" in
     call_processing_func "$recipePath/eccc-rdrs/rdrs.sh" "6months"
     ;;
 
-  # ECCC RDRS
+  # ECCC CaSR
   "casr" | "casrv3.1")
     call_processing_func "$recipePath/eccc-casr/casr.sh" "3months"
     ;;
 
+  # ECCC Casr Rivers
+  "casrriv" | "casr_riv_v2.1")
+    call_processing_func "$recipePath/eccc-casrriv/casrriv.sh" "3months"
+    ;;
   # ====================
   # Observation datasets
   # ====================
diff --git a/var/repos/builtin/recipes/eccc-casr/casr.sh b/var/repos/builtin/recipes/eccc-casr/casr.sh
index 622744f..3ce8af0 100755
--- a/var/repos/builtin/recipes/eccc-casr/casr.sh
+++ b/var/repos/builtin/recipes/eccc-casr/casr.sh
@@ -191,12 +191,12 @@ latLims="${minLat},${maxLat}"
 lonLims="${minLon},${maxLon}"
 
 # extract the associated indices corresponding to $latLims and $lonLims
-coordIdx="$(ncl -nQ 'coord_file='\"$domainFile\" 'minlat='"$minLat" 'maxlat='"$maxLat" 'minlon='"$minLon" 'maxlon='"$maxLon" "$coordIdxScript")"
+coordIdx="$(singularity exec $NCL_SINGULARITY_IMAGE ncl -nQ 'coord_file='\"$domainFile\" 'minlat='"$minLat" 'maxlat='"$maxLat" 'minlon='"$minLon" 'maxlon='"$maxLon" "$coordIdxScript")"
 
 # if spatial index out-of-bound, i.e., 'ERROR' is return
 if [[ "${coordIdx}" == "ERROR" ]]; then
   # extract the closest index values
-  coordIdx="$(ncl -nQ 'coord_file='\"$domainFile\" 'minlat='"$minLat" 'maxlat='"$maxLat" 'minlon='"$minLon" 'maxlon='"$maxLon" "$coordClosestIdxScript")"
+  coordIdx="$(singularity exec $NCL_SINGULARITY_IMAGE ncl -nQ 'coord_file='\"$domainFile\" 'minlat='"$minLat" 'maxlat='"$maxLat" 'minlon='"$minLon" 'maxlon='"$maxLon" "$coordClosestIdxScript")"
 fi
 
 # parse the output index for latitude and longitude
diff --git a/var/repos/builtin/recipes/eccc-casrriv/LICENSE b/var/repos/builtin/recipes/eccc-casrriv/LICENSE
new file mode 100644
index 0000000..53d1f3d
--- /dev/null
+++ b/var/repos/builtin/recipes/eccc-casrriv/LICENSE
@@ -0,0 +1,675 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
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+  For example, if you distribute copies of such a program, whether
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+
+  Developers that use the GNU GPL protect your rights with two steps:
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+giving you legal permission to copy, distribute and/or modify it.
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+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
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diff --git a/var/repos/builtin/recipes/eccc-casrriv/README.md b/var/repos/builtin/recipes/eccc-casrriv/README.md
new file mode 100644
index 0000000..675d0ef
--- /dev/null
+++ b/var/repos/builtin/recipes/eccc-casrriv/README.md
@@ -0,0 +1,69 @@
+# ECCC `CaSR-Rivers` v2.1
+In this file, the details of the dataset is explained.
+
+## Location of Dataset Files
+The `CaSR-Rivers` v2.1 dataset is located under the following directory accessible from GC Science
+```console
+ /home/shyd500/data/ppp6/casr_rivers_v2p1_postproc/full_domain
+```
+and the structure of the single-day hourly timestep data files is as follows:
+```console
+ /home/shyd500/data/ppp6/casr_rivers_v2p1_postproc/full_domain
+
+├── 198001
+│   ├── 19800101_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+│   ├── 19800102_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+│   ├── 19800103_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+│   ├── .
+│   ├── .
+│   ├── .
+│   └── 19800131_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+.
+.
+.
+├── %Y%m
+│   ├── %Y0101_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+│   ├── .
+│   ├── .
+│   ├── %Y%m%d_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+│   ├── .
+│   ├── .
+│   └── %Y1231_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+.
+.
+.
+└── 201712
+    ├── 20171201_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+    ├── .
+    ├── .
+    ├── .
+    └── 20171231_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+```
+
+## Coordinate Variables and Time-stamps
+
+### Coordinate Variables
+The coordinate variables of the `CaSR-Rivers` simulations are `lon` and `lat` representing the longitude and latitude points, respectively.
+### Time-stamps
+The time-stamps are included in the original files.
+
+## Dataset Variables
+The NetCDF files of the dataset contain only 1 variables (`disc`). You may see a list of variables by using the `ncdump -h`  command on one of the files:
+```console
+foo@bar:~$ ncdump -h /home/shyd500/data/ppp6/casr_rivers_v2p1_postproc/full_domain/201712/20171231_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H.nc
+```
+
+## Spatial Extent
+The spatial extent of the `CaSR-Rivers` v2.1 is ~1km
+
+## Temporal Extent
+The time-steps are hourly covering from `January 1980` to `December 2017`.
+
+## Short Description on `CaSR-Rivers` v2.1 Variables
+In most hydrological modelling applications, usually 7 variables are needed detailed as following: 1) specific humidity (@1.5-2.0m or @40m), 2) surface pressure, 3) air temperature (@1.5m-2.0m or 40m), 4) wind speed (@10m or @40m), 5) precipitation (surface level), 6) downward short wave radiation (surface level), and 7) downward long wave radiation (surface level). These variables are available through `RDRS` v2.1 dataset and their details are described in the table below:
+|Variable Name         |CaSR-Rivers Varname  |Unit   |Long Name                                                                                   |
+|----------------------|---------------------|-------|--------------------------------------------------------------------------------------------|
+|Streamflow Discharge  |disc                 |$m^3/s$|Mean discharge value exiting the river channel over the hour ending at the indicated time   |
+
+
+Please visit the [official website](https://goc-dx.science.gc.ca/~arg000/casr-webpages/casr_subpage_index.html) for the dataset for the most up-to-date information.
diff --git a/var/repos/builtin/recipes/eccc-casrriv/casrriv.sh b/var/repos/builtin/recipes/eccc-casrriv/casrriv.sh
new file mode 100755
index 0000000..8b63b33
--- /dev/null
+++ b/var/repos/builtin/recipes/eccc-casrriv/casrriv.sh
@@ -0,0 +1,338 @@
+#!/bin/bash
+# Meteorological Data Processing Workflow
+# Copyright (C) 2022-2023, University of Saskatchewan
+# Copyright (C) 2023-2024, University of Calgary
+#
+# This file is part of Meteorological Data Processing Workflow
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# =========================
+# Credits and contributions
+# =========================
+# 1. Parts of the code are taken from 
+#    https://www.shellscript.sh/tips/getopt/index.html
+
+
+# ================
+# General comments
+# ================
+# * All variables are camelCased for distinguishing from function names;
+# * function names are all in lower_case with words seperated by underscore for legibility;
+# * shell style is based on Google Open Source Projects'
+#   Style Guide: https://google.github.io/styleguide/shellguide.html
+
+
+# ===============
+# Usage functions
+# ===============
+short_usage() {
+  echo "usage: $(basename $0) [-cio DIR] [-v VARS] [-se DATE] [-t CHAR] [-ln REAL,REAL] [-p STR]"
+}
+
+
+# argument parsing using getopt - WORKS ONLY ON LINUX BY DEFAULT
+parsedArguments=$(getopt -a -n casrriv -o i:v:o:s:e:t:l:n:p:c:m:S:M: --long dataset-dir:,variable:,output-dir:,start-date:,end-date:,time-scale:,lat-lims:,lon-lims:,prefix:,cache:,ensemble:,scenario:,model: -- "$@")
+validArguments=$?
+if [ "$validArguments" != "0" ]; then
+  short_usage;
+  exit 1;
+fi
+
+# check if no options were passed
+if [ $# -eq 0 ]; then
+  echo "ERROR $(basename $0): arguments missing";
+  exit 1;
+fi
+
+# check long and short options passed
+eval set -- "$parsedArguments"
+while :
+do
+  case "$1" in
+    -i | --dataset-dir)   datasetDir="$2"      ; shift 2 ;; # required
+    -v | --variable)      variables="$2"       ; shift 2 ;; # required
+    -o | --output-dir)    outputDir="$2"       ; shift 2 ;; # required
+    -s | --start-date)    startDate="$2"       ; shift 2 ;; # required
+    -e | --end-date)      endDate="$2"         ; shift 2 ;; # required
+    -t | --time-scale)    timeScale="$2"       ; shift 2 ;; # redundant - added for compatibility
+    -l | --lat-lims)      latLims="$2"         ; shift 2 ;; # required
+    -n | --lon-lims)      lonLims="$2"         ; shift 2 ;; # required
+    -p | --prefix)	      prefix="$2"          ; shift 2 ;; # optional
+    -c | --cache)         cache="$2"           ; shift 2 ;; # required
+    -m | --ensemble)      ensemble="$2"        ; shift 2 ;; # redundant - added for compatibility
+    -S | --scenario)      scenario="$2"        ; shift 2 ;; # redundant - added for compatibility
+    -M | --model)         model="$2"           ; shift 2 ;; # redundant - added for compatibility
+
+    # -- means the end of the arguments; drop this, and break out of the while loop
+    --) shift; break ;;
+
+    # in case of invalid option
+    *)
+      echo "ERROR $(basename $0): invalid option '$1'";
+      short_usage; exit 1 ;;
+  esac
+done
+
+# useful log date format function
+logDate () { echo "($(date +"%Y-%m-%d %H:%M:%S")) "; }
+
+# check if $ensemble is provided
+if [[ -n "$ensemble" ]] || \
+   [[ -n "$scenario" ]] || \
+   [[ -n "$model" ]]; then
+  echo "$(logDate)$(basename $0): ERROR! redundant argument provided";
+  exit 1;
+fi
+
+# check the prefix of not set
+if [[ -z $prefix ]]; then
+  prefix="data_"
+fi
+
+
+# =====================
+# Necessary assumptions
+# =====================
+# TZ to be set to UTC to avoid invalid dates due to Daylight Saving
+alias date='TZ=UTC date'
+
+# expand aliases for the one stated above
+shopt -s expand_aliases
+
+# paths
+datatoolPath="$(dirname $0)/../../../../../" # datatool's path
+# daymet index scripts works on RDRSv2.1 grids as well
+# and ESPO-G6-R2 has similar grid system as RDRSv2.1
+coordIdxScript="$datatoolPath/etc/scripts/coord_daymet_idx.ncl"
+coordClosestIdxScript="$datatoolPath/etc/scripts/coord_closest_daymet_idx.ncl"
+
+
+# ==========================
+# Necessary global variables
+# ==========================
+# the structure of file names is as follows: "YYYYMMDD12.nc"
+rdrsFormat="%Y%m%d" # rdrs file date format
+exportFormat="%Y%m%d" # exported file date format
+fileStruct="_MSC_CaSR-Rivers-Analysis_RiverDischarge_Sfc_LatLon0.00833_PT0H" # source dataset files' suffix constant
+
+latDim="rlat"
+lonDim="rlon"
+
+
+# =================
+# Useful one-liners
+# =================
+#calcualte Unix EPOCH time in seconds from 1970-01-01 00:00:00
+unix_epoch () { date --date="$@" +"%s"; }
+
+#check whether the input is float or real
+check_real () { if [[ "$1" == *'.'* ]]; then echo 'float'; else echo 'int'; fi; }
+
+#convert to float if the number is 'int'
+to_float () { if [[ $(check_real $1) == 'int' ]]; then printf "%.1f" "$1"; echo; else printf "%.5f" "$1"; echo; fi; }
+
+#join array element by the specified delimiter
+join_by () { local IFS="$1"; shift; echo "$*"; }
+
+#to_float the latLims and lonLims, real numbers delimited by ','
+lims_to_float () { IFS=',' read -ra l <<< $@; f_arr=(); for i in "${l[@]}"; do f_arr+=($(to_float $i)); done; echo $(join_by , "${f_arr[@]}"); }
+
+
+# ===============
+# Data processing
+# ===============
+# display info
+echo "$(logDate)$(basename $0): processing ECCC CASR Rivers v2.1..."
+
+# make the output directory
+echo "$(logDate)$(basename $0): creating output directory under $outputDir"
+mkdir -p "$outputDir"
+echo "$(logDate)$(basename $0): creating cache directory under $cache"
+mkdir -p "$cache"
+
+
+# ======================
+# Extract domain extents
+# ======================
+
+# parse the upper and lower bounds of a given spatial limit
+minLat=$(echo $latLims | cut -d ',' -f 1)
+maxLat=$(echo $latLims | cut -d ',' -f 2)
+minLon=$(echo $lonLims | cut -d ',' -f 1)
+maxLon=$(echo $lonLims | cut -d ',' -f 2)
+
+# choose a sample file as all files share the same grid
+domainFile="$(find "${datasetDir}/" -type f -name "*.nc" | head -n 1)"
+
+# parse the upper and lower bounds of a given spatial limit
+minLat=$(echo $latLims | cut -d ',' -f 1)
+maxLat=$(echo $latLims | cut -d ',' -f 2)
+minLon=$(echo $lonLims | cut -d ',' -f 1)
+maxLon=$(echo $lonLims | cut -d ',' -f 2)
+
+# adding/subtracting 0.1 degree to/from max/min values
+minLat=$(bc <<< "$minLat - 0.1")
+maxLat=$(bc <<< "$maxLat + 0.1")
+minLon=$(bc <<< "$minLon - 0.1")
+maxLon=$(bc <<< "$maxLon + 0.1")
+
+# updating $latLims and $lonLims based on new values
+latLims="${minLat},${maxLat}"
+lonLims="${minLon},${maxLon}"
+
+# extract the associated indices corresponding to $latLims and $lonLims
+coordIdx="$(singularity exec $NCL_SINGULARITY_IMAGE ncl -nQ 'coord_file='\"$domainFile\" 'minlat='"$minLat" 'maxlat='"$maxLat" 'minlon='"$minLon" 'maxlon='"$maxLon" "$coordIdxScript")"
+
+# if spatial index out-of-bound, i.e., 'ERROR' is return
+if [[ "${coordIdx}" == "ERROR" ]]; then
+  # extract the closest index values
+  coordIdx="$(singularity exec $NCL_SINGULARITY_IMAGE ncl -nQ 'coord_file='\"$domainFile\" 'minlat='"$minLat" 'maxlat='"$maxLat" 'minlon='"$minLon" 'maxlon='"$maxLon" "$coordClosestIdxScript")"
+fi
+
+# parse the output index for latitude and longitude
+lonLimsIdx+="$(echo $coordIdx | cut -d ' ' -f 1)"
+latLimsIdx+="$(echo $coordIdx | cut -d ' ' -f 2)"
+
+
+# =====================
+# Extract dataset files
+# =====================
+# define necessary dates
+# Assure the end-date is not beyond 2018-12-30
+endDateInt=$(date --date="$endDate" +"%Y%m%d")
+if [[ $endDateInt -gt "20181230" ]]; then
+  endDate="2018-12-30T23:00:00"
+fi
+# Assure the start-date is not before 1980-01-01
+startDateInt=$(date --date="$startDate" +"%Y%m%d")
+if [[ $startDateInt -lt "19800101" ]]; then
+  startDate="1980-01-01T12:00:00"
+fi
+
+# assign proper variables for dates
+startYear=$(date --date="$startDate" +"%Y") # start year (first folder)
+startMonth=$(date --date="$startDate" +"%m") # start month (first folder)
+endYear=$(date --date="$endDate" +"%Y") # end year (last folder)
+endMonth=$(date --date="$endDate" +"%m") # end month (last folder)
+yearsRange=$(seq $startYear $endYear)
+
+toDate="$startDate"
+toDateUnix="$(unix_epoch "$toDate")"
+endDateUnix="$(unix_epoch "$endDate")"
+
+# iterate over the years
+for yr in $yearsRange; do
+  	
+    seqstart=1
+    seqend=12
+
+    if  [[ $yr == $startYear ]]; then
+	    seqstart=$startMonth
+    fi
+
+        
+    if  [[ $yr == $endYear ]]; then
+	    seqend=$endMonth
+    fi
+
+    monthseq=$(seq -w $seqstart $seqend)
+
+
+    for month in $monthseq; do
+          
+	  ym=$yr$month
+
+	  # creating yearly directory
+	  #mkdir -p "$outputDir/$ym" # output directory
+          mkdir -p "$cache/$ym" # cache directory
+
+	  # setting the end point, either the end of current year/mont, or the $endDate
+	  # last time-step of the current year/mont
+	  endOfCurrentYMonthUnix=$(date --date="$yr-$month-01 23:00:00 +1month -1day" "+%s")
+	  if [[ $endOfCurrentYMonthUnix -le $endDateUnix ]]; then
+	    endPointUnix=$endOfCurrentYMonthUnix
+	  else
+	    endPointUnix=$endDateUnix
+	  fi
+
+	  # extract variables from the forcing data files
+	  while [[ "$toDateUnix" -le "$endPointUnix" ]]; do
+	    # date manipulations
+	    # current timestamp formatted to conform to RDRS naming convention
+	    toDateFormatted=$(date --date "$toDate" +"$rdrsFormat")
+
+	    # creating file name
+	    file="${toDateFormatted}${fileStruct}.nc" # current file name
+
+	    # extracting spatial extents and variables
+	    until cdo -z zip \
+		-s -L \
+		-sellonlatbox,"$lonLims","$latLims" \
+		-selvar,"$variables" \
+		"${datasetDir}/${ym}/${file}" \
+		"${cache}/${ym}/${file}"; do
+	      echo "$(logDate)$(basename $0): Process killed: restarting process in 10 sec" >&2
+	      echo "CDO [...] failed" >&2
+	      sleep 10;
+	    done # until ncks
+
+	    # remove any left-over .tmp file
+	    if [[ -e ${cache}/${ym}/${file}*.tmp ]]; then
+	      rm -r "${cache}/${ym}/${file}*.tmp"
+	    fi
+
+	    # wait for any left-over processes to finish
+	    # note to self: not sure this even does anything, but anyways
+	    wait
+
+	    # change lon values so the extents are from ~-180 to 0
+	    # assuring the process finished using an `until` loop
+	    until ncap2 -O -s 'where(lon>0) lon=lon-360' \
+		    "${cache}/${ym}/${file}" \
+		    "${outputDir}/${prefix}${file}"; do
+	      rm "${outputDir}/${prefix}${file}"
+	      echo "$(logDate)$(basename $0): Process killed: restarting process in 10 sec" >&2
+	      echo "$(logDate)$(basename $0): NCAP2 -s [...] failed" >&2
+	      sleep 10;
+	    done
+
+	    # remove any left-over .tmp file
+	    if [[ -e ${cache}/${ym}/${file}*.tmp ]]; then
+	      rm -r "${cache}/${ym}/${file}*.tmp"
+	    fi
+
+	    # wait for any left-over processes to finish
+	    # note to self: not sure this even does anything, but anyways
+	    wait
+
+	    # increment time-step by one unit
+	    toDate="$(date --date "$toDate 1day")" # current time-step
+	    toDateUnix="$(unix_epoch "$toDate")" # current timestamp in unix EPOCH time
+	  done
+
+	  # go to the next year if necessary
+	  if [[ "$toDateUnix" == "$endOfCurrentYMonthUnix" ]]; then
+	    toDate=$(date --date "$toDate 1day")
+	  fi
+     done
+done
+
+mkdir -p "$HOME/empty_dir"
+echo "$(logDate)$(basename $0): deleting temporary files from $cache"
+rsync -aP --delete "$HOME/empty_dir/" "$cache"
+rm -r "$cache"
+echo "$(logDate)$(basename $0): temporary files from $cache are removed"
+echo "$(logDate)$(basename $0): results are produced under $outputDir"
+