Layer Name:	Hydrographic Units

Coverage Name:	HYDUNITS

Layer Type:	Polygon

Status:		Complete

Geog. Extent:	Islands of Oahu, Maui, Molokai, and Hawaii only.

Projection:	Universal Trans Mercator, Zone 4 (Meters)

Datum:	Nad 83

Description:	Hydrographic Units for the islands of Oahu, 
		Maui, Molokai and Hawaii.
		
Source:		Digitized from the Department of Land & Natural Resources,
		Division of Water and Land Development (DOWALD) folded
		paper Station Location maps, found in the 1983 open-file
		report 81-1056B, "Summary of Available Data on Surface
		Water," State of Hawaii, Vol. 3.  The scale of the
		source maps varied by island, and were as follows:
		
		Molokai, W. Maui and S.E. Maui at 1" = 1 mile (1:63,360)
		N.E. Maui at 25/32" = 1 mile (1:81,100.8)
		N. Oahu at 13/16" = 1 mile (1:77,981.5)
		S. Oahu at 15/16" = 1 mile (1:67,584)
		E. Hawaii at 25/32" = 2 miles (1:162,201.6)
		N.W. Hawaii at 13/16" = 2 miles (1:155,963)
		S.W. Hawaii at 15/16" = 2 miles (1:135,168)		

History:	Digitized in Arc/Info version 5 using ArcEdit by the 
		Office of State Planning (OSP) from DLNR/DOWALD maps
		described above.
		
Attributes:	Polygons:

		AREA		area of polygon (sq. meters)
		PERIMETER	perimeter of polygon (meters)
		HYDUNITS#	Polygon internal number (for Arc/Info use)
		HYDUNITS-ID	Polygon ID (for Arc/Info use)
		HYDNUM		Hydrographic Unit Number
		
			
		Arcs:
		
		FNODE#		From Node Number (for Arc/Info use)
		TNODE#		To Node Number (for Arc/Info use)
		LPOLY#		Left Polygon Number (for Arc/Info use)
		RPOLY#		Right Polygon Number (for Arc/Info use)
		LENGTH		Length (meters)
		HYDUNITS#	Arc Internal Number (for Arc/Info use)
		HYDUNITS-ID	Arc ID (for Arc/Info use)
		FLAG		Source of Arc
		
		FLAG		Definition
		
		0		Digitized arc
		1		Extracted arc (from 1:24,000 DLGs)
		2		Closure arc	
		3		Coastline arc
		9		Other
		
		

		

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