River Health in the New South Wales Lower North Coast, Hunter and Central Coast Catchments

A report of AusRivAS assessments 1994 - 1999
Grant Hose and Eren Turak
Environment Protection Agency, 2004
ISBN 0 642 55099 9 ISSN 1447-1280

Hunt02 - Williams River at Thalaba Bridge

Site Condition Summary
Sampling Data and Assessments
Site report cards

Site Condition Summary

This site was in the erosional plains section of the Williams River. Beyond the densely vegetated riparian zone, land had been cleared for grazing. Water quality variables were within ranges expected for a river of this type.

AusRivAS assessments indicated this site had biota in both the edge and riffle habitats that was similar to that expected of reference sites (band A). Taxa lists confirm this, and indicate fauna typical of the basic fauna expected in the respective habitats.

Location Map

Location Details
Map Name	Dungog 9233-2-S
Map Zone	56
Map Scale	1:25000
Easting	383500
Northing	6406900
Distance from source (m)	69976
Elevation (m asl)	100
Average Annual Rainfall (mm)	950

Single Season Assessments

Edge
	Spring '94	Autumn '95	Spring '95	Autumn '96
	11-Oct-94	2-May-95	18-Oct-95	1-Apr-96
O/E Taxa	0.93	0.78	1.18	0.88
Band	A	B	X	A
O/E SIGNAL	1.08	1.22	1	1.07

Riffle
	Autumn '95
	2-May-95
O/E Taxa	0.87
Band	A
O/ E SIGNAL	0.97

Combined Season Assessments

Edge
Seasons	SPR94AUT95	AUT95SPR95	SPR95AUT96
Model	Eastern	Eastern	Eastern
O/E Taxa	0.82	0.97	1.03
Band	B	A	A
O/ E SIGNAL	1.02	0.95	1.00

Riffle

Taxa Collected

X= Taxa Predicted & Collected, O = Taxa Predicted & NOT Collected, + = Taxa Collected & NOT Predicted

Edge
			Spring '94	Autumn '95	Spring '95	Autumn '96
Phylum	Class/Order	Family	11-Oct-94	2-May-95	18-Oct-95	1-Apr-96
Annelida	Oligochaeta			+	+
Arachnida	Hydracarina		X	X	X	X
Crustacea	Decapoda	Atyidae	X	X	X	X
Insecta	Coleoptera	Brentidae			+
Insecta	Coleoptera	Dytiscidae	O	O	X	X
Insecta	Coleoptera	Elmidae	X	X	X	X
Insecta	Coleoptera	Hydraenidae			+	+
Insecta	Coleoptera	Hydrophilidae	X	X	X	X
Insecta	Coleoptera	Psephenidae			+	+
Insecta	Diptera	Chironominae	X	O	X	X
Insecta	Diptera	Culicidae	+
Insecta	Diptera	Orthocladiinae	X	O	O	X
Insecta	Diptera	Tanypodinae	O	X	X	O
Insecta	Ephemeroptera	Baetidae	X	X	X	X
Insecta	Ephemeroptera	Caenidae	X	X	X	O
Insecta	Ephemeroptera	Leptophlebiidae	X	X	X	X
Insecta	Hemiptera	Corixidae	O	O	X	X
Insecta	Hemiptera	Gerridae	O	O	X	O
Insecta	Hemiptera	Hydrometridae	+
Insecta	Hemiptera	Notonectidae			+
Insecta	Hemiptera	Pleidae	+		+
Insecta	Hemiptera	Veliidae	X	O	X	O
Insecta	Megaloptera	Sialidae	+	+	+
Insecta	Odonata	Aeshnidae			+
Insecta	Odonata	Corduliidae				+
Insecta	Odonata	Gomphidae	X	X		X
Insecta	Odonata	Isostictidae	+	+
Insecta	Odonata	Libellulidae	O	O	+	O
Insecta	Odonata	Protoneuridae	+		+
Insecta	Trichoptera	Atriplectididae		+
Insecta	Trichoptera	Calamoceratidae	X	X	X	X
Insecta	Trichoptera	Ecnomidae	+
Insecta	Trichoptera	Helicopsychidae	+	+
Insecta	Trichoptera	Hydropsychidae		+
Insecta	Trichoptera	Hydroptilidae	O		O
Insecta	Trichoptera	Leptoceridae	X	X	X	X
Insecta	Trichoptera	Polycentropodidae	+			+
Mollusca	Bivalvia	Corbiculidae	+		+
Mollusca	Gastropoda	Hydrobiidae	+		+
Mollusca	Gastropoda	Physidae	X	+		+
Platyhelminthes	Turbellaria	Dugesiidae		+

X= Taxa Predicted & Collected, O = Taxa Predicted & NOT Collected, + = Taxa Collected & NOT Predicted

Riffle
			Autumn '95
Phylum	Class/Order	Family	2-May-95
Annelida	Oligochaeta		X
Arachnida	Hydracarina		X
Crustacea	Decapoda	Atyidae	X
Insecta	Coleoptera	Elmidae	X
Insecta	Coleoptera	Psephenidae	O
Insecta	Diptera	Chironominae	O
Insecta	Diptera	Orthocladiinae	X
Insecta	Diptera	Simuliidae	X
Insecta	Diptera	Tanypodinae	O
Insecta	Diptera	Tipulidae	O
Insecta	Ephemeroptera	Baetidae	X
Insecta	Ephemeroptera	Caenidae	X
Insecta	Ephemeroptera	Leptophlebiidae	X
Insecta	Lepidoptera	Pyralidae	O
Insecta	Megaloptera	Corydalidae	X
Insecta	Odonata	Corduliidae	O
Insecta	Odonata	Gomphidae	X
Insecta	Plecoptera	Gripopterygidae	X
Insecta	Trichoptera	Calamoceratidae	+
Insecta	Trichoptera	Hydrobiosidae	O
Insecta	Trichoptera	Hydropsychidae	X
Insecta	Trichoptera	Leptoceridae	X
Insecta	Trichoptera	Philopotamidae	O
Mollusca	Bivalvia	Corbiculidae	+
Platyhelminthes	Turbellaria	Dugesiidae	X

Water Quality Data

	Spring '94	Autumn '95	Spring '95	Autumn '96
Variable	11-Oct-94	2-May-95	18-Oct-95	1-Apr-96
Water Temperature (°C)	21.4	18.4	17.5	22.1
Conductivity (µS/Cm)	290	261	384	88
Alkalinity (mg CaCO₃ /L)	85	58	50	36
pH	6.53	7.23	7.6	7.15
Dissolved Oxygen (mg/L)	3.6	7.66	7.9	6.9
Turbidity (NTU)	6.3	2.9	4.1	11.3
Low Total Phosphorus (µg/L)	140	22	66	28
NOx Nitrogen (µg/L)	20	20	10	30
Total Kjeldahl Nitrogen (µg/L)	0.44	<0.3	0.45	<0.3

Key

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