Flows for fish
Environmental flow needs (EFN) for Mission Creek were set by the Okanagan Nation Alliance and the Okanagan Basin Water Board in 2020. This page counts the days each year when flow was below them, at gauge 08NM116 (the primary site) and at the creek mouth (D59).
| Life stage | Window | EFN (m³/s) |
|---|---|---|
| Rainbow trout rearing | 1 Apr to 31 Oct | 1.40 |
| Rainbow trout spawning | 20 May to 10 Jul | 4.83 |
| Kokanee spawning | 31 Aug to 5 Oct | 1.40 |
| Rainbow trout overwintering | 1 Nov to 31 Mar | 0.925 |
Life-stage summary from ONA/OBWB (2020) Table 3-15 (D59). Day counts use the weekly EFN schedule from the same study. No sockeye or chinook EFN exists in the source (D59).
146.5
days per year
Observed flow below the EFN at 08NM116, 1994 to 2024
F85
123.8
days per year
Model at 08NM116, same years
F85
16.3 / 6.2
days per year
Kokanee spawning window: observed / model
F85
outputs/efn/OBWB_EFNScoreSummary_v1_20261011.csv; F85, D59. Download data (CSV)outputs/efn/OBWB_EFNScoreByYear_v1_20261011.csv; F85. Download data (CSV)Limits
- The model counts fewer summer and kokanee days than the gauge recorded (48.9 against 79.8 rearing-window days). The model's summer flows are too high (F16), so modelled and future summer EFN counts are optimistic (F85).
- The mouth has no gauge; its counts are model only and are secondary (D59).
Confidence: Moderate (F85).
Numbers on this page and their sources
| Number | Value | Result file | Decision log | Second check |
|---|---|---|---|---|
| Days/yr below EFN, model_08NM116, kokanee_spawning | 6.2 | outputs/efn/OBWB_EFNScoreSummary_v1_20261011.csvoutputs/efn/OBWB_EFNScoreByYear_v1_20261011.csv | F85 | mean of by-year table |
| Days/yr below EFN, model_08NM116, rainbow_rearing_insect | 48.9 | outputs/efn/OBWB_EFNScoreSummary_v1_20261011.csvoutputs/efn/OBWB_EFNScoreByYear_v1_20261011.csv | F85 | mean of by-year table |
| Days/yr below EFN, model_08NM116, water_year | 123.8 | outputs/efn/OBWB_EFNScoreSummary_v1_20261011.csvoutputs/efn/OBWB_EFNScoreByYear_v1_20261011.csv | F85 | mean of by-year table |
| Days/yr below EFN, obs_08NM116, kokanee_spawning | 16.3 | outputs/efn/OBWB_EFNScoreSummary_v1_20261011.csvoutputs/efn/OBWB_EFNScoreByYear_v1_20261011.csv | F85 | mean of by-year table |
| Days/yr below EFN, obs_08NM116, rainbow_rearing_insect | 79.8 | outputs/efn/OBWB_EFNScoreSummary_v1_20261011.csvoutputs/efn/OBWB_EFNScoreByYear_v1_20261011.csv | F85 | mean of by-year table |
| Days/yr below EFN, obs_08NM116, water_year | 146.5 | outputs/efn/OBWB_EFNScoreSummary_v1_20261011.csvoutputs/efn/OBWB_EFNScoreByYear_v1_20261011.csv | F85 | mean of by-year table |
| EFN kokanee_spawning (m3/s) | 1.40 | outputs/efn/OBWB_EFNTable315_v1_20261011.csv | D59 | none |
| EFN rainbow_overwintering (m3/s) | 0.925 | outputs/efn/OBWB_EFNTable315_v1_20261011.csv | D59 | none |
| EFN rainbow_rearing_insect (m3/s) | 1.40 | outputs/efn/OBWB_EFNTable315_v1_20261011.csv | D59 | none |
| EFN rainbow_spawning (m3/s) | 4.83 | outputs/efn/OBWB_EFNTable315_v1_20261011.csv | D59 | none |