| BIOPHYSICAL | |||
| IMPACT NAME | POSITIVE SCOPE OF IMPACT | NEGATIVE SCOPE OF IMPACT | INDICATOR |
| BP1: water quality | Reservoir stores heavy metals, pesticides, PCBs | changes cycling of nutrients, carbon, DO, TSS, temperature, periphyton | reservoir retention time |
| BP2: biodiversity | Habitat created for rare/endemic species | rare or endemic species affected; quality of affected habitats or sensitive ecosystems; potential creation of new habitat | index of habitat quality- habitat classification, species occurrence |
| BP3: sediment | Reservoir stores anthropogenic sources of sediment eroded from upstream | DS channel changes: degradation/aggradation; modification to grain size distribution, depositional features, and channel morphology | trap efficiency of dam, percentage of basin that contributes to the dam |
| BP4: natural flow regime | Food protection, storage for irrigation, domestic, or industrial use | changes to historic hydrograph- magnitude, duration, timing, and frequency of high and low flows; channel morphology, DS degradation/aggradation, migration or spawning cues, substrate conditions, condition of riparian vegetation | Carryover storage – (0) run of river (1) seasonal storage (2) annual storage and (3) multiple year storage |
| BP5: climate and air quality | Reduced equivalent emission of GHG from coal | Reservoir methane emissions | amount of GHG emitted from equivalent MW of coal power generation- energy density (MW/unit area of reservoir) |
| BP6: landscape stability | Reservoir-induced seismicity, Landslide potential | weight of reservoir, distance to faults, landslide hazard, grade of slopes, erosivity of soils | |
| BP7: impact area | Lentic habitat created | Loss of riverine, riparian, and terrestrial habitat | surface area of the reservoir, length of river impounded, length of power transmission lines, habitat classification data |
River Engineering and Restoration
@ Oregon State University