tidal flood Articles

  • Tidal technology to stop flooding

    A large 1.6 metre valve that stops tidal waters getting into the stormwater network will help stop flooding in the city centre during heavy rainfalls.   High tidal levels and heavy rain cause problems in Porirua, New Zealand.  Porirua was the first Council in New Zealand to test the valves, which are a Scandinavian design called WaStop. The Councils Water Services Engineer Desmond ...


    By WaStop International AB

  • Tidal Water case study

    References from WaStop International´s own patented products. WaStop solves problems in a secure and efficient way. Harwich harbour - ENGLAND Anglian Water is one of the leading providers of water and waste water services in Europe and serves the needs of around six million industrial, commercial and domestic customers. Aggressive tidal waters, silt and poor ...


    By WaStop International AB

  • Porirua New Zealand – WaStop® DN225 - Case Study

    Porirua City located 20 km north of Wellington has over 70 storm water outlets into the harbour. A number of these outlets are very flat on their approach to the harbour which generally means they are severely influenced by high tides. The problem with these outlets is that if a rain fall event coincides with a high tide, the ability of the storm water network to discharge is severely restricted. ...


    By Wapro AB

  • One-dimensional hydrodynamic model accounting for tidal effect

    Tidal effect has a significant impact on flood routing in tidal rivers, conceptually taking on a resistant effect during flood tide and a dynamic effect during ebb tide. Two expressions were developed to reflect the tidal effect in this study, which consisted of the tidal wave velocity, the change rate of tidal level and the change in channel width. By incorporating the expressions into the ...


    By IWA Publishing

  • Challenges of Modeling a Tidal Influence Conveyance System, a Seattle, Washington Case Study

    Hydraulic modeling of a drainage basin usually involves system representation of a network that flows either by gravity downhill or a force main via an outfall to a receiving water body or a treatment plant. And calibration of such a system is usually straight forward. Occasionally, engineers encounter a “City of New Orleans” type of conveyance system, where most of the storm drain network is ...

  • The Thames flood series: a lack of trend in flood magnitude and a decline in maximum levels

    The flow series for the River Thames near its tidal limit is one of the most studied in the world. Its length and completeness, and the richness of the historical information which augments the formal flow record, ensures that the series is of immense value. However, the variability in flood magnitude and frequency that it captures needs to be interpreted with caution. The homogeneity of the time ...


    By IWA Publishing

  • Flood Forecasting and Warning Services in general

    An exact and early Flood Forecasting allows accordant early warning of persons concerned as much as the establishment of necessary measures (see Flood Protection, Evacuation and Rescue Plans). Therefore, it can make an important contribution to avoid damage. Flood Forecasting is in most cases based on extensive numerical modelling which is created with hydrological and hydraulic models of ...


    By IWA Publishing

  • Living with floods in the Mahanadi Delta, India

    In October 2013, one of the fiercest cyclones to hit the Bay of Bengal for many years made landfall on the low-lying delta coast of the Indian state of Odisha. With winds battering the coastline at more than 200 kilometres per hour, the structural damage from cyclone Phailin was intense. Thousands of straw, timber and bamboo homes were destroyed across the delta of the River Mahanadi, one of ...


    By Wetlands International

  • Generating meshes for tidal wetland modeling using light detection and ranging (LiDAR) data

    A high resolution model mesh was required to numerically simulate sediment transport in tidal marshes. The timing of flooding is dependent on the tidal marsh ground elevation, which requires accurate topographic elevation data. The tidal prism of the marsh is determined by the volume provided by tidal channels in the system. Hence, their location and bathymetry needed to be represented ...


    By IWA Publishing

  • ‘Smart’ flood alleviation system protects Portsmouth

    In late 2014, Southern Water completed a major project to reduce the risk of sewer flooding in parts of Portsmouth and Southsea. Substantial works were undertaken to divert runoff and tidal ingress, and a ‘smart’ hydrometeorological monitoring system was installed to enable prompt diversion of excess water during periods of high rainfall. Sewer level monitoring is undertaken in ...

  • Flood Risk Mapping for Scotland Takes Off

    Untitled Document Scotland has an area of roughly 79,000km2 and a population of five ...


    By Innovyze

  • Self closing flood barrier: Carrick on Suir, county Tipperary, Ireland

    Client: Office of Public Works, Ireland Project Detail: The historic river side town of Carrick on Suir in County Tipperary in Southern Ireland has long been prone to river and tidal flooding. This is an area which is heavily dependent upon having good access to the river since it is from the town’s North and South Quays, that fishermen launch ...


    By UK Flood Barriers Limited

  • InfoWorks RS aids priority river flood modeling in New Zealand

    Project Background Innovyze’s InfoWorks RS has been the key software in helping to formulate flood risk reduction strategies throughout the Northland Region of New Zealand, an area of approximately 14,000 km2 on the northern tip of New Zealand’s North Island. The Northland Region has a predominately tropical climate. In recent years a number of tropical storms have ...


    By Innovyze

  • Case Study - Waterwegen en Zeekanall NV - Hoboken on the River Schelde, Antwerp. Right Bank

    Architect: Johann van den Noort Timing: 2010 The Problem The yacht club at Hoboken is located on the right bank of the River Schelde, close to Antwerp. In spite of being many miles inland, the river is tidal at this point and at times of very high water and tidal surge from the North Sea, the industrial areas in the immediate ...


  • Case Study - Hoboken, Antwerp, Belgium

    The yacht club at Hoboken is located on the right bank of the River Scheldt, close to Antwerp. In spite of being many miles inland, the river is tidal at this point and at times of very high water and tidal surge from the North Sea, the industrial areas in the immediate hinterland are at risk of flood. The many dykes protecting the region had to be cut in order to allow access points and slip ...


    By AGGERES

  • Falkirk Council case study

    Falkirk County Council, Scotland Supply and installation and maintenance of a Trash Screen blockage and Flood Warning system, 2006 - ongoing Hydro-Logic was appointed by Falkirk County Council to supply, install and commission a series of 7 sites where there were concerns over flooding. The systems were deployed to supply alarms to a central control office at Falkirk ...


    By Hydro-Logic Services

  • Case Study - Waterwegen en Zeekanall NV - Schelle Belle on the River Schelde, Antwerp

    Architect: Johann van den Noort Timing: 2010 The Problem Antwerp is located on the River Schelde, a major tidal river which feeds into the North Sea. At points of very high water and tidal surge from the North Sea, the populated areas in the immediate hinterland are often at flood risk where there are entry points to the river ...


  • A river stage correction approach using Fourier series

    One-dimensional hydrodynamic models based on the Saint-Venant equations (the SVN model) are used widely for river stage prediction. Errors that originate from simplifying assumptions, improper specification of initial and boundary conditions, uncertainty in parameters, channel geometry, observed data, and solution methods produce the inconsistencies between actual flow and that represented by ...


    By IWA Publishing

  • Best Practice Guidelines on Restoration of Mangroves in Tsunami Affected Areas

    Glossary Afforestation: Cultivating plants (mangroves) in an area where no plants (mangroves) grew previously Air layering: A form of vegetative propagation where a branch is stimulated to form roots while still on the parent plant by removing part of the bark and keeping the area moist Cotyledon: Leaf forming part of embryo or newly emerged seedling Ecosystem: Part of the ...


    By Wetlands International

  • Problem Solving with InfoWorks RS 3: Analyzing Saline Intrusion

    This is the third in a series of articles on InfoWorks RS, Wallingford Software’s integrated modeling solution for river systems. The series explains how InfoWorks RS can address specific problems that face the authorities around the world that are responsible for managing rivers.  The capabilities of InfoWorks RS have been greatly expanded since its original development as a flood modeling ...


    By Innovyze

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