Water for the townships of Matatoki, Omahu and Hikutaia in the Coromandel region is sourced from two small streams (Matatoki Stream and the Omahu Stream) located in the hinterland behind the townships. The majority of the water supplied is used for stock (predominately dairy) in the area with a smaller portion used for domestic supply. The schemes were originally developed in the 1930’s and 1950’s by the local farmers in the area for farm water supply and then taken over by Thames Coromandel District Council in the 1970’s. Thames Coromandel District Council sought a renewal of the water take consents for these schemes and applied to the Waikato Regional Council for consent.
The townships of Waipukurau and Waipawa in Central Hawke’s Bay currently discharge treated municipal wastewater effluent to the Tukituki and Waipawa rivers respectively. The two rivers merge downstream of the two townships, where the Tukituki name remains. The Tukituki river is of high amenity value, being the most frequently fished river in the region and is popular for public recreation. For this reason Central Hawke’s Bay District Council (CHBDC) and Hawke’s Bay Regional Council (HBRC) are working collaboratively to significantly improve the water quality of the affected rivers.
Many sewer pump stations in New Zealand are reaching the point where significant upgrading is required either because of their age or due to insufficient capacity.
This paper looks at the upgrades that were made to one such station in Whangarei.
This paper goes on to highlight the basic design concepts and terminology in respect of RO, including the membrane materials commonly used and the key design and operating parameters.
This paper highlights the results of modelling w ork w hich describes how the production of sludge alters with differing wastewater drivers, and w hat the potential impacts are for downstream processing of the sludge and its influence on carbon footprint.
Kapiti Coast District Council is planning to manage and meet future water demand in a potentially high growth District. The Council is currently working towards a 50-year supplementary water supply solution for the communities of Waikanae, Paraparaumu and Raumati. This project is running in parallel with Council's water conservation programme that involves a number of initiatives to reduce demand across the District. Two of the water conservation action areas are water loss reduction and data gathering.
This paper presents a unique and complex stormwater case study problem, explaining the use of current technologies (GIS, LiDAR, terrestrial survey and 3D land surface modelling) to produce a detailed integrated model used as both a hydraulic analyses and a design tool.
This paper explores this development in infrastructure management by considering the approach from the perspective of stormwater asset management. It considers the functional drivers and outcomes sought within the context of a new operational approach.
Asset Management, Environment, Sustainability, Low Impact Design (LID), Water Sensitive Urban Design (WSUD), Stormwater, Integration, Urban Design, Community Outcomes, Infrastructure, Non-financial Performance Indicators, Local Government Act, Resource Management Act, Co-ordinated Operational Responsibilities, Community Orientated Results
The Napier Cross Country Drain was designed to future-proof the drainage of suburban Napier. The scheme was conceived in 1995 and a discharge consent for 20 m3 /s capacity and land designations over the full length were granted in the late 1990s.
The accepted industry treatment method for heavy metals management from contaminated site stormwater requires sand/peat media within sandfilter devices. There is no industry standard for scrap metal yards.
The paper will also explain the impacts of not carrying out these investigations fully, particularly in relation to the operation and maintenance of the infiltration basins.
Complex interactions occur in tidal creeks with changes in salinity and mixing causing flocculation of sediments and deposition of metals, as well as dissolution of some metals from bottom sediments into the overlying water column. A study in Henderson Creek (Central Waitemata Harbour, Auckland) is investigating processes that occur in tidal creeks to further our understanding of the fate of stormwater-derived contaminants in wider estuarine receiving waters.
This paper focuses on providing a window into what really occurs in storm water drains in real time from a water quality perspective. The data presented will allow a determination of the best management model based on the realistic risks involved for the particular receiving system.
Large concentrations of algae pose immediate water quality issues. Water quality issues posed by the presence of large concentrations of algae include: decreased water clarity, increased suspended solids, reduced dissolved oxygen levels, altered pH levels and in some instances production of deadly toxins. Controlling algae in stormwater systems helps to prevent this degradation of water quality and reduces the rate of sediment build up while also providing aesthetic improvement.
Monitoring is an essential function of any planning or operational framework. It generates the information needed to report on performance and progress, demonstrate accountability, and support good decision-making. What gets monitored, how it gets monitored, and the use of the resulting data generally reflects the interests of the parties defining the question that the monitoring programme is intended to answer.
This paper is concerned with examining the available Auckland stormwater quality data for evidence of contaminant first flush and its characteristics. The first flush refers to the situation of having a very high delivery of either concentration or mass of a pollutant during the early part of the storm runoff event.
This paper utilizes the long term and detailed monitoring network set up as part of the Hikurangi Flood Control Scheme to assess the limitations of substituting anecdotal and qualitative data for detailed monitoring.
This paper outlines the initial options investigated and the model runs completed. It discusses the different applications the model was used for during the last 12 to 18 months. The paper also discusses the advantages and disadvantages of using a coupled 1D/2D model for option assessment and discusses the lessons learned.
This paper looks to outline some of the unique features and issues encountered in the development of this project including: An overview on key aspects of the modelling process (including particular comment on the advantages and limitations on some of the tools used), a review on the effectiveness of some historical informal structures used to ìcontainî the river, a summary of implications and associated decisions for the community, and comment on potential development of real-time and predictive tools into the future.
This paper will share our experience and knowledge gained by using the latest innovative technologies and GIS integration, from commencement through to the completion of developing a reliable product: a meaningful and efficient model.