FloodMan Engineering was commissioned by Logan Water Infrastructure Alliance (LWIA) to design a proposed wastewater effluent treatment system. The design consisted of two (2) main clusters of wetland cells with sub-cells with interconnecting pipes. Due to the stringent discharge licence criteria and complexity of the design FloodMan Engineering developed a detailed integrated stormwater and effluent inflow hydrodynamic model (TUFLOW) of the preliminary design to assess performance against a number of criteria.
Richmond Valley Council
Casino Urban Drainage Study
Richmond Valley Council engaged FloodMan Engineering to undertake a detailed Pilot Urban Drainage Study of the Casino township. With the town being built within the flat and counter sunk floodplain of the Richmond River, urban drainage problems are frequent and complex. We developed an intricate 1D/2D 2m grid TUFLOW model of the entire pilot 45ha drainage system using Direct Rainfall Method (DRM). The methodology is now being implemented across the entire township over 900ha with thousands of pits and pipes. Our team implemented innovative techniques by adopting the procedures outlined with Australian Rainfall and Runoff 2016, as well as using XP-RAFTS to validate the DRM, and utilising InfoWorks ICM to process all Council’s asset data ready for direct and efficient importation into TUFLOW.
FloodMan was engaged by Rous County Council to undertake a flood mitigation options assessment for the high flood risk zone surrounding the airport that has only 1 in 10 (10% AEP) immunity. Following the March 2017 event, Council was under pressure by the community and political members to provide solutions. We developed a fine grid 10m 1D/2D TUFLOW model of the Lismore city area based on the 2017 event to initially assess a number of options for mitigation and protection in the South Lismore area. Preliminary civil design of each of the three options tested was undertaken using 12D. An XP-RAFTS model was also developed of the Gundurimba Creek catchment to provide inflows at its confluence with the Wilson River of which is in close proximity to the airport study area.
NSW Roads and Maritime Services (RMS) Northern Region (Grafton)
LISMORE TO BANGALOW ROAD UPGRADE FLOOD INVESTIGATION
FloodMan was engaged by NSW RMS to undertake a flood study for the proposed Lismore to Bangalow Road upgrade between Lagoon Grass and Bexhill. The project aims to raise sections of the road to be consistent with the Boatharbour Bridge deck level over the Wilsons Creek to improve flood immunity and access during floods.
We developed a fine grid 5m 1D/2D TUFLOW model of the floodplain area that includes the major tributary Coopers Creek. An XP-RAFTS model was also developed of the entire catchment to ensure latest Hydrology is in line with Australian Rainfall-Runoff 2016. The models will be used to inform the following:
Current and pre-upgrade flood immunity of the road design extents;
Potential impacts upon 3rd parties and mitigation solutions;
Upgrade gains in flood immunity; and
Crossflow culvert capacity and upgrades required to meet desired levels of service.
Rous County Council in collaboration with Lismore City Council and the NSW Office of Environment and Heritage
LISMORE FLOODPLAIN RISK MANAGEMENT STUDY AND PLAN TECHNICAL SPECIFICATION
FloodMan Engineering was engaged by Rous County Council to review all available and background information pertaining to the greater Lismore City region floodplain. The data collected was massive and totalled near 3TB. Our team carefully sifted through the data to extract pertinent information that would form the base for the Floodplain Risk Management Study and Plan to be contracted in the near future. Various stakeholders requested that a local consultant be involved early in the process. We worked closely and collaborated with Rous County Council, Lismore City Council and the NSW Office of Environment and Heritage (OEH) and developed the project Technical Specification document.
Clarence Valley Council
TALOUMBI RING DRAINAGE OPTIONS - DATA COLLECTION AND MODELLING PHASE
FloodMan Engineering was engaged by Clarence Valley Council to deliver a drainage options report of the Taloumbi Ring Drain (Lake Wooloweyah). FloodMan is developed a detailed 1D/2D TUFLOW flood model of the catchment, which also included assessment of coastal interaction with fluvial flooding and climate change in accordance with Council’s policies, the NSW Floodplain Development Manual 2005, OEH guidelines, Australian Rainfall and Runoff 2016 and industry best and leading practice.
In consultation with Council and utilising local expertise, the FloodMan team was responsible for identifying and testing scenario options to provide drainage on farmland surrounding Lake Wooloweyah.
Rous County Council
LISMORE FLOODPLAIN RISK MANAGEMENT STUDY – DATA COLLECTION AND MODELLING PHASE
FloodMan Engineering was successfully engaged to deliver undertake a floodplain risk management study (FRMS) (Initial Phase) covering the Lismore Central Business District and associated upstream catchment. FloodMan was responsible for coordinating all elements of the FRMS including scope bathymetric and topographic survey to inform a revalidation of the Wilsons River flood model to the major flood event of 2017. The study improves the understanding of flood behaviour and impacts of flooding events to better inform management of flood risk in the CBD. In delivering the study we worked with Rous County Council, Lismore City Council, NSW Office of Environment and Heritage (OEH), the Bureau of Meteorology (BOM) and the NSW State Emergency Services (SES). The project was be delivered in line with industry best practice and current guidelines such as Australian Rainfall and Runoff 2016. The project reviewed the existing floodplain management study and plan as well as a comprehensive review of existing hydrological and hydraulic models to recommend management measures, options and schemes, as well as testing and investigating practical, feasible and economic management measures to treat existing and future risk so as to achieve tolerable levels of residual risk.
LOT 5 ON DP558822, DIAMOND HEAD ROAD, DUNBOGAN NSW
FloodMan Engineering (FloodMan) have been engaged by Mr Boyd Goodear (Goodear Constructions) to prepare a Flood Risk Impact Assessment and Evacuation Plan Report (herein this Report) over Diamond Head Road, Dunbogan, NSW, properly described as Lot 5 on DP558822 (the subject site). The subject site is situated within the Port Macquarie-Hastings Council (PMHC) Local Government Authority (LGA). A fully dynamic 1D/2D linked TUFLOW hydraulic model was developed for the FIA to assess the possible impacts of the proposed dwelling on its surrounding area to accompany a Development Application (DA) to PMHC for the subject site and also to address the requirement of the latest Flood Policy 2015.
160 SETTLEMENT POINT ROAD, PORT MACQUARIE NSW
FloodMan Engineering (FloodMan) have been engaged by Mr Daniel Chapman to prepare a Stormwater Management Assessment (SWA) and Flood Risk and Impact Assessment (FIA) over 160 Settlement Point Road, Port Macquarie, NSW, properly described as Lot 4 on DP538813 (the subject site). The subject site is situated within the Port Macquarie Hastings Council (PMHC) Local Government Authority (LGA).
The Stormwater Quantity Management (SMP) has been designed in accordance with PMHC Stormwater Drainage Design Guidelines 2008 through the use of XP-SWMM software - a link-node model that is capable of performing hydrology and hydraulics of stormwater drainage system simultaneously. The XP-SWMM model was developed in accordance with ARR 2016 guidelines to determine the On-site Detention system needed to ensure no increase in flow due to the proposed development for a range of events from 63% AEP to 1% AEP.
For the purpose of the Flood Impact Assessment, a fully dynamic 1D/2D linked TUFLOW flood model was to developed to assess the possible impacts of the proposed dwelling alterations, shed and fill on its surrounding areas.
FloodMan Engineering were commissioned to deliver a stormwater hydraulic impact assessment to accompany and Operational Works detailed design and construction project for a Stormwater Quality Improvement Device (SQID) in Maroochydore within the Sunshine Coast Regional Council area. This involved developing a fine grid localised 1D/2D stormwater network model and assess any potential impacts that may result from the flow obstruction and diversion system. Certificate system. FloodMan Engineering was responsible for providing the most appropriate SQID and provide a certified hydraulic impact assessment for the preferred SQID.
Toowoomba Regional Council
TOOWOOMBA REGIONAL COUNCIL LGA GUIDELINES REVIEW
FloodMan Engineering was engaged by Toowoomba Regional Council to assist RMA Engineers and provide specialist hydraulic input, review of, and understanding on industry best practice guidelines as part of Council’s internal standards, specifications and policies – specifically, Australian Rainfall and Runoff Guidelines 2016 (ARR2016) and Queensland Urban Drainage Manual 2017. As part of the review FloodMan reviewed four existing XP-RAFTS hydrology models of local suburbs. These models were updated to ARR2016 temporal patterns and BoM IFDs. A summary of critical durations, and peak discharge was provided to Council with a recommendation of priority future works, including update of catchment hydrology models.
Allyce & Josh Cullen
189 SUNNYVALE DRIVE, KEW NSW
FloodMan Engineering were engaged to prepare a Flood Impact Assessment and Emergency Management Plan Report of the proposed dwelling at 189 Sunnyvale Road, Kew, NSW within the Port Macquarie Hastings Council (PMHC) Local Government Authority (LGA). A qualitative and quantitative approach has been undertaken to assessing the risks associated with flooding at the subject site. This included the use of the industry standard software package TUFLOW, an existing Flood Study dated 2013, the Australian Rainfall and Runoff (ARR 2016) guide for risk assessment and data obtained from Bureau of Meteorology (BOM). The hydraulic interaction between the proposed development and the existing hydraulic function of the site was determined to address the possible impact of proposed development on the existing flood regime. On conclusion of the project a comprehensive report was issued to the client and PMHC supporting the development application.
BRICKMAKERS CREEK - STORMWATER HYDRAULIC IMPACT ASSESSMENT
FloodMan Engineering were commissioned to deliver a stormwater hydraulic impact assessment for a proposed trash rack at Brickmakers Creek, Liverpool. The assessment involved the augmentation of Council’s existing TUFLOW model to quantify potential flood stormwater hydraulic impacts from the proposed trash rack. Based on the hydraulic impact assessment FloodMan Engineering also provided advice on velocities and scour potential. A number of iterations were assessed to determine the implications of debris collection (blockage) to guide the design of the trash rack in accordance with Council’s development and stormwater management guidelines.
NSW Roads and Maritime Services
KAMILAROI HIGHWAY UPGRADE - HYDRAULIC PEER REVIEW
RMS completed the design of a proposed road upgrade and FloodMan Engineering was engaged to provide an independent specialist peer review and validation of the hydrology and hydraulic impact assessment. In addition to review the regional hydraulic impact assessment, FloodMan was required to develop a flood model of the local catchment to ensure the proposed road upgrade would not result in adverse flood impacts in design events up to the 1% AEP flood event.
Mr Bernard Jones
150 THE HATCH ROAD, BLACKMANS POINT NSW
FloodMan Engineering (FloodMan) have been engaged by Mr. Bernard Jones to prepare a Flood Impact Assessment and Emergency Management Plan (herein this Report) over 150 The Hatch Road, Blackmans Point NSW, within the Port Macquarie Hastings Council (PMHC) Local Government Authority (LGA). The hydraulic interaction between the proposed development and the existing hydraulic function of the site is to be determined to address the possible impact of proposed development on the existing flood regime. The industry standard software package TUFLOW, an existing Flood Study dated 2006, the Australian Rainfall and Runoff (ARR 2016) guide for risk assessment and data obtained from Bureau of Meteorology (BOM) were used.