Required GIS Datasets

1. Drainage lines (usually delineated center lines) with at least the following attributes (columns) for each feature:

   • model_id: A unique identifier/ID, any alphanumeric utf-8 string will suffice
   • downstream_model_id: The ID of the next downstream reach
   • strahler_order: The strahler stream order of each reach
   • model_drain_area: Cumulative upstream drainage area
   • x: The x coordinate of the centroid of each feature (precalculated for faster results later)
   • y: The y coordinate of the centroid of each feature (precalculated for faster results later)

2. Points representing the location of each of the river gauging station available with at least the following attributes (columns) for each feature:

   • gauge_id: A unique identifier/ID, any alphanumeric utf-8 string will suffice.
   • model_id: The ID of the stream segment which corresponds to that gauge.

The drain_table.parquet should look like this:

downstream_model_id	model_id	model_area	strahler_order	x	y
unique_stream_#	unique_stream_#	area in km^2	stream_order	##	##
unique_stream_#	unique_stream_#	area in km^2	stream_order	##	##
unique_stream_#	unique_stream_#	area in km^2	stream_order	##	##
...	...	...	...	...	...

The gauge_table.parquet should look like this:

model_id	gauge_id	gauge_area
unique_stream_num	unique_gauge_num	area in km^2
unique_stream_num	unique_gauge_num	area in km^2
unique_stream_num	unique_gauge_num	area in km^2
...	...	...

Things to check

Be sure that both datasets:

• Are in the same projected coordinate system
• Only contain gauges and reaches within the area of interest. Clip/delete anything else.

Other things to consider:

• You may find it helpful to also have the catchments, adjoint catchments, and a watershed boundary polygon for visualization purposes.