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Rivers and Wetlands

Algal availability of phosphorus discharged from different catchment sources

Algal Management Strategies, Nutrient Management Strategies and Catchment Management Plans frequently have as a major focus the reduction of phosphorus loads to surface waters. The expressed intention of the nutrient control is to reduce the frequency and intensity of algal blooms, particularly blooms of toxic cyanobacteria. In many instances a direct link between the magnitude of algal blooms and phosphorus loads has not been demonstrated. However, there is appreciable information in the scientific (more)...

Sources and Delivery of Suspended Sediment and Phosphorus to Australian Rivers

“Combining tracers and landscape modelling to predict sediment and phosphorus from different landuses and erosion processes.” Sedimentation in streams and rivers draining agricultural land has resulted in severe environmental degradation. Eutrophication is a major associated issue, and the persistent occurrence of algal blooms has been linked with excess available P. The total amount of P in these systems has been shown to be dominated by the sediment bound load derived from erosion (more)...

Sources and delivery of suspended sediment and phosphorus to Australian rivers

“Combining tracers and landscape modelling to predict sediment and phosphorus from different landuses and erosion processes” Sedimentation in streams and rivers draining agricultural land has resulted in severe environmental degradation. Eutrophication is a major associated issue, and the persistent occurrence of algal blooms has been linked with excess available P. The total amount of P in these systems has been shown to be dominated by the sediment bound load derived from erosion of (more)...

Catchment assessment techniques to help determine priorities in river restoration

The intent is for the assessment techniques described to provide an improved rational basis for setting stream rehabilitation priorities. Focus catchments were chosen that had issues aligned with those in the project objectives. Two existing assessment techniques; SedNet (Prosser et al., 2001) and RARC (Jansen et al., 2004a), were selected to be developed for regional scale priority setting, based on the project team’s expertise with these techniques. These techniques were (more)...

Catchment assessment techniques to help determine priorities in river restoration

The intent is for the assessment techniques described to provide an improved rational basis for setting stream rehabilitation priorities. Focus catchments were chosen that had issues aligned with those in the project objectives. Two existing assessment techniques; SedNet (Prosser et al., 2001) and RARC (Jansen et al., 2004a), were selected to be developed for regional scale priority setting, based on the project team’s expertise with these techniques. These techniques (more)...

Hydrological effects of floodgate management on coastal floodplain agriculture

Extensive drainage systems have been constructed on coastal floodplains to mitigate the effects of floods and to enable the development of agricultural industries. They have also greatly increased the rate of acidity entering creeks and estuaries from acid sulfate soils, resulted in a loss of fish breeding habitats and led to changes in the vegetation composition of backswamps. Coastal drains usually have floodgates which prevent tidal inundation of backswamps and reduce the ingress of saline water (more)...

Hydrological effects of floodgate management on coastal floodplain agriculture

This project has examined the processes causing poor drainage water quality from acid sulfate soil backswamps, quantified the water quality improvements resulting from floodgate opening strategies, quantified the effectiveness of acid groundwater retention strategies, and examined the salinity risks to sugar cane from opening floodgates. Project Objectives: 1. To identify and quantify the effects of changes to floodgate and land management practices on (more)...

SIGNAL scoring system for river bio-assessment by community groups

SIGNAL stands for ‘Stream Invertebrate Grade Number – Average Level.’ It is a simple scoring system for macro-invertebrate (‘water bug’) samples from Australian rivers. A SIGNAL score gives an indication of water quality in the river from which the sample was collected. Rivers with high SIGNAL scores are likely to have low levels of salinity, turbidity and nutrients such as nitrogen and phosphorus. They (more)...

SIGNAL scoring system for river bio-assessment by community groups

SIGNAL stands for ‘Stream Invertebrate Grade Number – Average Level.’ It is a simple scoring system for macro-invertebrate (‘water bug’) samples from Australian rivers. A SIGNAL score gives an indication of water quality in the river from which the sample was collected. Rivers with high SIGNAL scores are likely to have low levels of salinity, turbidity and nutrients such as nitrogen (more)...

Murrumbidgee Wetland Seedbank Research Project

Preliminary report

The majority of wetlands along the Murrumbidgee are owned privately, yet little is known about these wetlands and there is evidence they are in poor ecological condition (Spencer et. al. 1998). This project was aimed at discovering the nature of the plant communities within wetlands on private land on the Murrumbidgee River. At the commencement of the project the region was in the midst of a drought, meaning vegetation surveys would not have been fruitful. A soil seedbank study was conducted instead. (more)...