Layer Name:	Watershed Unit Boundary Polygons and Attributes

Coverage Name:	WTRSHDPY 	

Layer Type:	Polygon

Status:		Complete

Geog. Extent:	Islands of Niihau, Kauai, Oahu, Molokai, Lanai, Maui,
		Kahoolawe and Hawaii

Projection:	Universal Trans Mercator, Zone 4 (Meters)

Datum:		NAD83

Description:	Watershed Unit Boundaries for the 8 major hawaiian islands,
		generated in Arc/Info and GRID using USGS DEM data.
		
Source:		GDSI, 1995		

History:	

General:

Most arcs were created automatically from digital elevation model (DEM)
data of Arc/INFO GRID watershed commands as described in the report
"State Definition and Delineation of Watersheds" submitted along with
these coverages.  Arcs which could not be automatically created were
manually digitized either on-screen (for small arcs and those across
nearly flat areas) or from paper topographic quadrangle maps 1:24,000
scale (for longer arcs).  Coastline arcs were copied from the ALLCOAST
coverage from the Office of State Planning.  There is an arc attribute
to identify the source of each arc.

Automatic:

Most arcs were created automatically from smoothed 1:24,000 scale
DEMs from the USGS.  After smoothing, these were considered to be about
equal to 1:100,000 scale DEMs.  Therefore, the arcs derived from them
are similar to those that could be defined from 1:100,000 contour
maps.  However, for Big Island, this was only done for the northeast
coast.  The rest of the island was generated automatically from 1:250,000
scale DEMs from the USGS.

Manual:

Manual arcs were added where automatic boundaries crossed a stream
(usually in the upper headwaters) and where topography became so flat
that automatic delineation was not possible (usually along the lower
coastal areas).

		
Attributes:	Polygons:

		AREA		area of polygon (sq. meters)
		PERIMETER	perimeter of polygon (meters)
		<ISL>WSHDLN#	Polygon internal number (for Arc/Info use)
		<ISL>WSHDLN-ID	Polygon ID (for Arc/Info use)
		HLUCODE         Hydrologic Unit code as described by USGS
		COLON           colon spacer :
		HGUCODE         Hydrographic Unit code as described by USGS
		DASH            dash spacer -
		HSACODE         Hawaii Stream Assessment Mouth Code
		
		**  Note  **
		Hawaii Stream Assessment code for watershed units associated
		with perennial streams.
		For watershed units associated with intermittent streams, codes
		from the working files for the Hawaii Stream Assessment
		provided by Sallie Edmunds were used.
		For watershed units not associated with any stream coded by the
		Hawaii Stream Assessment, numbers were assigned uniquely
		within a hydrographic unit, starting at 99 and working
		down.  It therefore easy to distinguish these watershed units.
		**  
		
		DOT 		dot spacer .
		SUBCODE         Hawaii Stream Assessment Sub-unit Code
		WUNAME          Watershed Unit name
		
		**  Note  **
		Name of watershed unit based on Hawaii Stream Assessment names.
		Where no Hawaii Stream Assessment name exists, the name of a
		major stream or feature in the watershed unit is used.
		**
		
		WUTYPE           Watershed Unit type
		WIC              Closest WIC area
		
		**  Note  **
		Watershed Identification Code (used by DLNR) for WIC area
		closest to matching the watershed unit.
		**
		
		ACRES            Acreage of polygon
		
		**  Note  **
		Polygon area in acres.  These acreages have to summed where
		multiple polygons comprise a single watershed unit.
		**


		REDEFINED ITEMS     
		------------------
		WUCODE		Complete Watershed Unit code 
				(combines "-CODE" items, above)
		WUABBR		Island Watershed Unit abbreviation
				(combines HGUCODE and HSACODE)
		WUABBRSUB	Island Watershed Unit abbreviation
				including sub-watershed code (Oahu only)
				

		ANNOTATION (1 or 2 annotation classes)
		--------------------------------------
		WUABBR    	Watershed Unit Code abbreviations for 
				1:100,000 scale maps
		WUABBR250 	Watershed Unit Code abbreviations for 
				1:250,000 scale maps
				(Big Island only)
				
		Attribute Value Definitions
		---------------------------

		SUBCODE 	Definition
		
		00		Flows into ocean (mouth of system). 
				(Mouth of non-system streams also given 
				this value.)
		01, 02, 03	Major tributaries of stream system (Oahu only)
		
		
		
		WUTYPE		Definition
		
		P		Perennial 
				(whether continuous or interrupted, except 
				 stream systems)
		I		Intermittent
		A		Flows into Class AA or other special waters
				(and neither 'P' nor 'I')
		B		Flows into inland Basin 
				(and neither 'P' nor 'I')
		S		Stream system (mouth or tributary)
		X		Watersheds not included in above categories

		
Contact:	Joan Delos Santos, Office of Planning, State of Hawaii, 
		PO Box 2359, Honolulu, Hi.  96804; (808) 587-2895.
		email:  JDelos_Santos@dbedt.hawaii.gov