Land, forests and fire
Forest covers most of the watershed. The model uses one fixed land cover; logging, fire and beetle kill are not represented in it (F98).
outputs/OBWB_InterimCropBySubbasin_v1_20261003.csv. Download data (CSV)Crops
Cropland covers 1490.2 ha: orchards 68.5%, forage and pasture 20.4%, vineyards 10.0% (F94). Golf courses cover 199 ha (F94). The model withdraws crop demand at the intakes; it has no crop areas of its own (F94).
Forests
The 2025 provincial forest inventory (VRI) gives five forest groups (F97). In the model, almost all forest is one class.
outputs/forest_et/OBWB_ForestClassSummary_v1_20261011.csv; F97. Download data (CSV)The model's grass (10,231 ha) and shrub (6,878 ha) classes come from a land cover of about 2000. Much of that area has since regrown to forest (F96). Mapped wetlands total 1,093 ha and riparian zones 5,940 ha (F99).
Logging, fire and beetles
Equivalent clearcut area (ECA) expresses past logging and fire as the area of fresh clearcut with the same effect on snow and runoff. Above gauge 08NM116, on the central recovery curve, it was 20.0% in 1990, 17.7% in 2008 and 24.1% in 2021 (F98).
outputs/forest_disturbance/OBWB_ECAByGaugeYear_v1_20261011.csv; F98. Download data (CSV)- The 2003 Okanagan Mountain Park fire burned inside the watershed at high, medium and low severity over 1,358, 2,159 and 657 ha (F98; Low confidence on the split).
- A model test that adds logging, fire and beetle kill raises the mean annual flow at 08NM116 by 7.6 GL per year (3.8%) (F98). The test was not recalibrated and is not part of the working model.
Confidence: High on the inventory and on disturbance being absent from the model; Moderate on ECA and the model test; Low on fire severity and beetle weights (F98).
Numbers on this page and their sources
| Number | Value | Result file | Decision log | Second check |
|---|---|---|---|---|
| Cropland (ha) | 1490.2 | outputs/OBWB_InterimCropBySubbasin_v1_20261003.csv | F94 | orchard commodity split + other classes |
| Disturbance test, annual flow change at 08NM116 (GL/yr) | 7.6 | outputs/forest_disturbance/raventest/OBWB_RavenTestResponse_v1_20261011.csv | F98 | none |
| Disturbance test change (%) | 3.8 | outputs/forest_disturbance/raventest/OBWB_RavenTestResponse_v1_20261011.csv | F98 | none |
| ECA above 08NM116 1990, TO2015 (%) | 20.0 | outputs/forest_disturbance/OBWB_ECAByGaugeYear_v1_20261011.csv | F98 | eca_ha / area_ha |
| ECA above 08NM116 2008, TO2015 (%) | 17.7 | outputs/forest_disturbance/OBWB_ECAByGaugeYear_v1_20261011.csv | F98 | eca_ha / area_ha |
| ECA above 08NM116 2021, TO2015 (%) | 24.1 | outputs/forest_disturbance/OBWB_ECAByGaugeYear_v1_20261011.csv | F98 | eca_ha / area_ha |
| 2003 fire ha_high (ha) | 1,358 | outputs/forest_disturbance/OBWB_FireEventsInside_v1_20261011.csv | F98 | none |
| 2003 fire ha_low (ha) | 657 | outputs/forest_disturbance/OBWB_FireEventsInside_v1_20261011.csv | F98 | none |
| 2003 fire ha_medium (ha) | 2,159 | outputs/forest_disturbance/OBWB_FireEventsInside_v1_20261011.csv | F98 | none |
| Forage and pasture share (%) | 20.4 | outputs/OBWB_InterimCropBySubbasin_v1_20261003.csv | F94 | none |
| Golf courses in the watershed (ha) | 199 | outputs/crop_roster/OBWB_CropRosterAreaBySubbasin_v1_20261011.csv | F94 | none |
| Model GRASS class (ha) | 10,231 | outputs/OBWB_BasinLandCover_v1_20261002.csv | F96 | none |
| Orchard share of cropland (%) | 68.5 | outputs/OBWB_InterimCropBySubbasin_v1_20261003.csv | F94 | crop roster orchard commodities |
| Riparian zones (ha) | 5,940 | outputs/wetland_riparian_et/OBWB_WetlandRiparianAreas_v1_20261011.csv | F99 | km2 column x 100 |
| Model SHRUBLAND class (ha) | 6,878 | outputs/OBWB_BasinLandCover_v1_20261002.csv | F96 | none |
| Vineyard share (%) | 10.0 | outputs/OBWB_InterimCropBySubbasin_v1_20261003.csv | F94 | crop roster grape |
| Mapped wetlands (ha) | 1,093 | outputs/wetland_riparian_et/OBWB_WetlandRiparianAreas_v1_20261011.csv | F99 | km2 column x 100 |