SOA Category OG13

OG13 applies to a broad range of works that integrate civil engineering with environmental protection:

• Natural slope stabilization: interventions to secure unstable or landslide-prone slopes using naturalistic engineering techniques such as timber cribbing, live staking, brush layering, vegetated earthworks, and reforestation. These measures reinforce the soil while maintaining ecological continuity.
• Riverbank protection and naturalistic river works: eco‑compatible stabilization of watercourses using vegetated structures, bioengineering systems, dry‑stone masonry, and riparian vegetation to reduce erosion and enhance habitats.
• Reforestation and protective afforestation: restoration of burned or degraded slopes to reduce runoff, stabilize soil, and re‑establish natural cover.
• Environmental rehabilitation of quarries, landfills, and degraded sites: reshaping of terrain, backfilling, and vegetation to restore ecological balance and reinsert the site into the landscape.
• Hydro‑forestry interventions: small hydraulic and forestry works to stabilize mountain basins, including wooden or stone check dams, vegetated channels, agricultural terracing with live crib structures, and erosion‑control systems.

• OG8 – River and hydraulic works: OG8 concerns structural hydraulic interventions (levees, canals, retention basins). Compared to OG13, it focuses on “hard” engineering, while OG13 focuses on naturalistic solutions. Often the two categories operate together—for example, concrete check dams (OG8) combined with vegetated riverbank restoration (OG13).
• OG12 – Environmental remediation: OG12 covers technical remediation (landfills, geomembranes, decontamination). OG12 manages pollution and containment; OG13 handles ecological and landscape restoration. In landfill closures, OG12 completes the capping and systems, and OG13 designs the final landscape and vegetation.
• OS21 – Special structural works: includes retaining walls, micropiles, anchors, and slope stabilization systems. It is frequently combined with OG13 when landslide risk requires both structural consolidation (OS21) and ecological restoration (OG13).
• OS12-B – Rockfall protection systems: includes passive protection such as rockfall nets and barriers. In integrated projects, OG13 provides active bioengineering stabilization, while OS12‑B delivers passive safety systems.