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Attachment 7 - Flood Impact Assessment - Covey · 132005.638.06
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3.9 Fraction Impervious
The fraction impervious values adopted for each land use are as follows:
• Roads – 100%
• Trees / Bushland - 0%
• Grassland – 0%
• Roof– 100%
• Unsealed road – 50%
• Water body – 100%
• Compost – 80%
• Solar Panels – 100%
• Landfill – 75%
3.10 Topography
The existing surface topography is shown in Figure 3-2. Topography for the full extent of the 2D hydraulic
model was created using 2015/2023 LIDAR and survey within the development site (grey area on Figure
3-2).
Figure 3-2 – Existing Site Topography with 0.5m Contours
Flood Impact Assessment Page 10 of 25
Project No 244035 | Ref No M25-0479Rpt – Issue A – January 2026
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