Calculator
Enter your garden odor source, weather conditions, and setback distance. The tool estimates downwind odor and sizes common control options.
Example data table
Use this example to confirm your inputs and expected output scale.
| Source | Area (m²) | Temp (°C) | RH (%) | Wind (m/s) | Distance (m) | Intensity | Estimated OU/m³ | Required reduction |
|---|---|---|---|---|---|---|---|---|
| Compost pile | 6 | 28 | 65 | 2.0 | 25 | 3 | ~1,200 | ~99.9% |
| Manure pile | 4 | 22 | 55 | 3.0 | 40 | 2 | ~240 | ~99.4% |
Numbers are illustrative. Field conditions vary; treat results as planning guidance.
Formula used
This tool uses simplified planning equations to compare options consistently.
Odor emission rate
Base emission depends on source type.
E = Base × Area × T_factor × RH_factor × Intensity
T_factor = clamp(1 + 0.03 × (T−20), 0.5, 2.0)
RH_factor = clamp(0.6 + 0.01 × RH, 0.6, 1.4)
RH_factor = clamp(0.6 + 0.01 × RH, 0.6, 1.4)
Downwind concentration and required reduction
C_est = (E × 60) / (Wind × Distance) × Safety
Required reduction = clamp(1 − Target/C_est, 0, 0.999)
Control sizing
Biofilter volume uses empty-bed residence time (EBRT):
V_bio = Q × (EBRT/3600), and A_bio = V_bio / BedDepth.
Carbon and neutralizer models are simplified consumption estimates for comparison and planning.
V_bio = Q × (EBRT/3600), and A_bio = V_bio / BedDepth.
Carbon and neutralizer models are simplified consumption estimates for comparison and planning.
How to use this calculator
- Pick the odor source type that matches your garden condition.
- Choose area or volume, then enter the size of the source.
- Enter weather values from the time odors are noticed.
- Set the distance to the nearest sensitive location.
- Pick an acceptable threshold and a safety factor.
- Press Calculate and review reduction and sizing outputs.
- Start with low-cost steps, then scale controls if needed.