LAYER NAME: Rivers - DoW
Title: Hydrography - hierarchy
Custodian: Department of Water (DoW)
Search Words: Streams, Rivers, Water Features
Abstract: Major streamlines of WA, coded with a hierarchy and are named. The dataset includes many streams in addition to the detailed Hydrography in areas where its data is limited (eg. Eastern Wheatbelt and Western Plateau). Dataset is designed to be evolving as more information becomes available (eg. Aerial Photography)
Jurisdiction: Western Australia
Geographic Extent: Western Australia
Capture Scale: Variable
Horizontal Coordinate: Geographic System
Geodetic Model: GDA 1994
Beginning Date: January 1995
Ending Date: June 2004
Progress: Complete
Update Frequency: Monthly
Stored Data Format: SDE 8
Available Format: Any ESRI format
Access Constraint: Internal at present, to be made external
by 1 October 2004
Positional Accuracy: Variable, dependent on original data
Attribute Accuracy: Good where given, but incomplete
Logical Consistency: ArcView was used to build line topology.
Completeness: The set only incudes major streamlines and lakes across the state.
Internal Custodian: Scientific&Technical: Senior
Engineer
Surface Water Hydrology
DoE
(Peter Muirden, 9278 0456)
i METHODOLOGY
1) The data was compiled from a number of sources:
- Original work was the 1 million dataset, but this has been improved in most
places by use of 250,000 and 100,000 or better linework.
- However, in many places even this linework was poor (eg. wheatbelt rivers
like the Lockhart), so in many areas, aerial photography and landsat images
have been used to improve the linework.
- The primary aim of the data set is to have a contiguous set of major rivers
that can be used across the whole state.
2) All linework has been coded with a statewide hierarchy, with major rivers
coded separately to minor rivers; there is a hiearchy of 6 levels
3) Most linework has been named with either its official Geonoma name or its
Coloquial name (and coded which is used - see below)
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ii FIELD DESCRIPTION:
*LEVEL_EST [String 35] ={}; Hydro Level Hierarchy, but with Estuaries shown
separately; for LEVEL values see below;
*LEVEL_NAME [String 35] = {}; Hydro Level Hierarchy, but with Estuaries included
as part of the LEVEL Hierarchy; for LEVEL values see below;
*LEVEL [Numeric 3.0] = {0,1-6, 10,15,35} Hierarchy; where level 1 is most significant
and level 6 is least; 0 is Coastal Waterline, 10 is simply an inundation area,
15 is a Paleo-Drainage Line (a broad valley floor which only flows rarely if
ever;
*TYPE_NAME [String 35] = {}; Type_Code above as a text string; the list of codes
is given below; incomplete
*HYD_TYPE [String 50] = {}; Type of water feature using codes from hydrography
SDE layer; incomplete
*TYPE_CODE [Numeric 2.0] = {0;11-51}; Code as below to describe the type of
feature; note, incomplete: not all features are coded at present;
*HYD_NAME [String 50] = {}; name of hydrograph feature; may also include non-geonoma
names which are coded in the NAMED field below; incomplete, but primary features
are named; See below for explaination;
*SYS_NAME [String 40] = {}; Used to name a stream when it contains a feature
like a named lake (eg. Lake Argyle), but is also still part of that streamline
(ie. Ord River); See below for explaination;
*NAMED [Num 1.0] = {1-4}; Flag for identifying named features; Details below;
*SAL_CODE [Numeric 1.0] = 0-8; Salinity code (see below) where 0 is unknown,
1 is fresh and 8 is hypersaline; INCOMPLETE
*BASIN [Num 4.0] = {601-1206}; AWRC Basin number; these are given in the SDE
theme: HYDROGRAPHIC_CATCHMENTS_BASINS; incomplete
*IMAGE [String 35] = Image used for digitising / verification (includes date
in image name)
*COMMENT [String 40] = Comment in relation to linework quality compared with
Hydrography
*REMARKS [String 50] = Generalised comment
*OFFICER [String 35] = Name of DoE officer changing linework
*EDITDATE [Date] = Date the linework was created/Modified
Detailed Codes:
LEVEL NAME, LEVEL:
- The hierarchy of the states major watercourses are described in the following
list, with level 1 being the most significant and level 6 being the least significant
of the major watercourses.
- Inundation Areas extend outside the boundary of a major watercourse.
- Paleo-Drainage Lines are the lines of ancient rivers which now only flow in
major events if at all. They are normally not marked on the existing Hydrography
datasets we have, but when they flow can cause major damage to infrastructure.
Mainstream, 1
Major River, 2
Minor River, 3
Significant Stream, 4
Major Trib, 5
Minor Trib, 6
Inundation Area, 10
Paleo-Drainage Line, 15
Infrastructure, 35
LEVEL_EST:
This is the primary display symbology/legend of the dataset where the LEVEL_NAME
above is shown unless the waterfeature is Estuarine or Coastal Waterline.
NAMED FEATURES EXPLAINATION:
Many water features have names, some are recorded by the Geonoma Committee,
others are only used within DoE and locally, while others have two names. In
this dataset, the HYD_NAME records the primary name of a feature as it is usually
known (eg. Wellington Reservoir). The SYS_NAME records the generic name that
the feature lies on (eg. Collie River, which runs through Wellington Reservoir),
which allows selection of an entire feature with different pool, lake and reservoir
names.
The NAMED field is a flag for identifying named features, and whether it is
a Geonoma name (NAMED=1or2) or a Coloquial name (NAMED=3or4). There are two
codes for each type because the first in each set is for a primary name and
the second is if there are both.
SAL_CODE (incomplete)
0= Unknown
1= Fresh [0-500mg/L]
2= Marginal [500-1,000mg/L]
3= Marg-Brackish [1,000-1,500mg/L]
4= Hi-Brackish [1,500-3,000mg/L]
5= Lo-Saline [3,000-7,000mg/L]
6= Mid-Saline [7,000-14,000mg/L]
7= Hi-Saline [14,000-35,000mg/L]
8= Hyper-Saline [35,000-300,000mg/L]
TYPE_CODE: (linework partially complete):
11= River/Stream
12= Overflow Channel
15= Paleo Drainage Line
16= Drain - Supply Channel
17= Drain - Closed Deep Drain
18= Drain - Open
19= Drain - type unknown
21= Riverine Pool
23= Farm Dam
24= Swamp
25= Natural Lake
26= Lake - Usually dry
27= Reservoir
28= Inundation area - Lake/Swamp
29= Inundation area - River/Channel
31= Lake Island
33= Farm Dam Wall
35= Levee Bank/Embankment
36= Weir
37= Dam Wall/Spillway
38= Groyne/Jetty [31]
39= Other Infrastructure
40= Coast
41= Estuarine
42= Coastal Island
43= Sand Bar
44= Tidal Flat
51= Estuarine (Closed)
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iii MAINTENANCE PLAN
1) Ongoing updates are expected on a monthly basis initially, based on user
feedback and required work in all areas.
2) It is planned by Dec 2004 to finish coding the SWLD streamlines with Salinity
codes