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

Mann571 - Manning River at Clearwater

Site Condition Summary
Sampling Data and Assessments
Site report cards

Site Condition Summary

This site was on the coastal plain, downstream of the confluence of the Manning and Nowendoc Rivers and upstream of the junction with the Gloucester River. The land on either side of the river was used for grazing and had been variably cleared.

The riparian zone had in parts been cleared and invaded by exotic plant species. Cattle had also impacted upon the riparian and instream habitats.

Water quality appeared good, but large patches of filamentous algae were noted. Water quality analyses indicated nutrient concentrations were low, and other variables were within expected ranges.

AusRivAS assessments for both riffle and edge habitats indicated quite a rich macroinvertebrate fauna was present in each (O/E-Taxa values in band A).

Location Map

Location Details
Map Name	Knorrit Flat 9334-3-N
Map Zone	56
Map Scale	1:25000
Easting	414500
Northing	6476800
Distance from source (m)	123329
Elevation (m asl)	35
Average Annual Rainfall (mm)	1100

Single Season Assessments

Edge
	Spring '99
	15-Dec-99
O/E Taxa	1.13
Band	A
O/E SIGNAL	0.93

Riffle
	Spring '99
	15-Dec-99
O/E Taxa	0.82
Band	A
O/E SIGNAL	0.99

Combined Season Assessments

Edge

Riffle

Taxa Collected

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

Edge
			Spring '99
Phylum	Class/Order	Family	15-Dec-99
Annelida	Oligochaeta
Arachnida	Hydracarina		X
Crustacea	Decapoda	Atyidae	X
Crustacea	Decapoda	Palaemonidae	+
Crustacea	Ostracoda		+
Insecta	Coleoptera	Dytiscidae	X
Insecta	Coleoptera	Elmidae	X
Insecta	Coleoptera	Hydrophilidae	X
Insecta	Coleoptera	Staphylinidae
Insecta	Diptera	Ceratopogonidae	+
Insecta	Diptera	Chironominae	X
Insecta	Diptera	Orthocladiinae	X
Insecta	Diptera	Tanypodinae	X
Insecta	Ephemeroptera	Baetidae	X
Insecta	Ephemeroptera	Caenidae	X
Insecta	Ephemeroptera	Leptophlebiidae	O
Insecta	Hemiptera	Corixidae	X
Insecta	Hemiptera	Gerridae	O
Insecta	Hemiptera	Veliidae	X
Insecta	Odonata	Coenagrionidae	+
Insecta	Odonata	Gomphidae	O
Insecta	Odonata	Libellulidae	X
Insecta	Trichoptera	Calamoceratidae	X
Insecta	Trichoptera	Hydropsychidae	+
Insecta	Trichoptera	Hydroptilidae	X
Insecta	Trichoptera	Leptoceridae	X
Mollusca	Gastropoda	Lymnaeidae	+
Mollusca	Gastropoda	Physidae	X
Mollusca	Gastropoda	Thiaridae	+
Platyhelminthes	Turbellaria	Dugesiidae	+

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

Riffle
			Spring '99
Phylum	Class/Order	Family	15-Dec-99
Platyhelminthes	Turbellaria		O
Mollusca	Gastropoda	Ancylidae	+
Mollusca	Gastropoda	Physidae	+
Annelida	Oligochaeta	Oligochaeta	X
Arachnida	Hydracarina	Hydracarina	X
Crustacea	Decapoda	Atyidae	O
Insecta	Coleoptera	Elmidae	X
Insecta	Coleoptera	Psephenidae	X
Insecta	Diptera	Tipulidae	O
Insecta	Diptera	Simuliidae	X
Insecta	Diptera	Tanypodinae	O
Insecta	Diptera	Orthocladiinae	X
Insecta	Diptera	Chironominae	X
Insecta	Ephemeroptera	Baetidae	X
Insecta	Ephemeroptera	Leptophlebiidae	X
Insecta	Ephemeroptera	Caenidae	X
Insecta	Lepidoptera	Pyralidae	+
Insecta	Megaloptera	Corydalidae	X
Insecta	Odonata	Amphipterygidae	+
Insecta	Odonata	Gomphidae	O
Insecta	Odonata	Libellulidae	+
Insecta	Plecoptera	Gripopterygidae	X
Insecta	Trichoptera	Hydrobiosidae	O
Insecta	Trichoptera	Hydroptilidae	+
Insecta	Trichoptera	Philopotamidae	X
Insecta	Trichoptera	Hydropsychidae	X
Insecta	Trichoptera	Conoesucidae	O
Insecta	Trichoptera	Leptoceridae	O

Water Quality Data

	Autumn '99	Spring '99
Variable	13-May-99	15-Dec-99
Water Temperature (°C)	16.3	24.4
Conductivity (µS/Cm)	144	200
Dissolved Oxygen (mg/L)	10.7	9.5
Alkalinity (mg CaCO₃ /L)	54	50
pH	8.47	8.78
Turbidity (NTU)	1	1.6
Low Total Phosphorus (µg/L)	14	24
Free Reactive Phosphorus (µg/L)	10	15
NOx Nitrogen (µg/L)	5	7
Total Kjeldahl Nitrogen (mg/L)	<0.3	<0.3
Ammonia (µg/L)	6	10
Nitrate (µg/L)	4	6
Nitrite (µg/L)	<1	1

Key

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