3D Biodiversity Net Gain Timeline

Timeline

Simulated years 0.0 yr

Timeline speed 2.0 yr/s

Development site (destroyed at Y0)

Footprint area 3.0 ha

Offset habitat (grown over time)

Offset parcels 18

Years to target condition 12 yr

Biodiversity units

Baseline lost

0.00

Required (+10%)

0.00

Delivered @ year

0.00

Net change

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BNG status

Advance the timeline

How it works

Habitat destruction is immediate; habitat creation is not. This 3D view animates that lag directly on a UK BNG-style ledger.

g(t)   = 1 − e^(−t / τ),  τ = targetYears / (2.5 × difficulty)
height = area × distinctiveness × condition(good) × difficulty
                × g(t) × strategic-significance × spatial risk

lost      = development area × distinctiveness × condition(moderate)
required  = lost × 1.10

The red slab is the flattened development footprint — its value is gone from year 0 and never recovers in this model.
Each green pillar is one offset parcel, growing along its own maturation curve toward the habitat's target condition; harder-to-create habitats (woodland, wetland) grow slower and top out lower.
The translucent threshold plane marks the average pillar height needed to clear the statutory +10% net-gain bar right now — watch whether the pillars are still below it in the early years.
Scrub or play the timeline to see how long a scheme spends in biodiversity debt before the offset catches up — the exact risk the temporal discount in real BNG assessments is pricing.

Destroyed footprint Offset parcel (growing) +10% threshold plane

Year 0.0

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