modelling of these 1D elements (culverts/pipe networks), ensures that the capacity and conveyance of these systems are accurately modelled. Each square grid element contains information on ground topography, sampled from the DEM at 1 m spacing in the 2 m domain and 2.5 m in the 5 m domain, surface resistance to flow (Manning’s ‘n’ value) and initial water level. Seventeen areas of different land-use type, determined from planning maps, aerial photography and site inspections, were identified for setting values. These Manning’s ‘n’ are summarised in . Figure 48 TUFLOW Model Setup Table 412 2D Domain Manning’s ‘n’ Coefficients Land use n Manning’s 0.15 Low Density Residential 0.2 Residential 0.4 High Density Residential 0.4 Commercial/High Density Industrial 1 Building Envelope 0.035 Open Space Maintained Grass – 0.05 Open Space Unmaintained Grass – 0.55 Open Space Low Density Vegetation – 0.65 Open Space Medium Density Vegetation – 0.1 Open Space High Density Vegetation – 0.03 Sports Ovals 0.045 Easements 0.05 Developed Parks/School Fields 0.2 Schools and Public Areas of Similar Type 0.1 Cemetery 0.025 Roads 0.03 Open Water
modelling of these 1D elements (culverts/pipe networks), ensures that the capacity and conveyance of these systems are accurately modelled. Each square grid element contains information on ground topography, sampled from the DEM at 1 m spacing in the 2 m domain and 2.5 m in the 5 m domain, surface resistance to flow (Manning’s ‘n’ value) and initial water level. Seventeen areas of different land-use type, determined from planning maps, aerial photography and site inspections, were identified for setting Manning’s ‘n’ values. These are summarised in . Figure 48 TUFLOW Model Setup Table 412 2D Domain Manning’s ‘n’ Coefficients Land use Manning’s n Low Density Residential 0.15 Residential 0.2 High Density Residential 0.4 Commercial/High Density Industrial 0.4 Building Envelope 1 Open Space – Maintained Grass 0.035 Open Space – Unmaintained Grass 0.05 Open Space – Low Density Vegetation 0.55 Open Space – Medium Density Vegetation 0.65 Open Space – High Density Vegetation 0.1 Sports Ovals 0.03 Easements 0.045 Developed Parks/School Fields 0.05 Schools and Public Areas of Similar Type 0.2 Cemetery 0.1 Roads 0.025 Open Water 0.03
8d2a95337a000c2-HightonDrainageFloodStudyAdoptedbyCouncil.docx