Water Quantity (Perry, 2016 Ecohydrology)
- Large scale clearcuts and regrowth of plantations make low summer water flow even lower.
- Flows can still be reduced 40-50 years later.
- Roads cause the most problem with sediment in water, followed by landslides and clearcuts.
- Too much sediment keeps chlorine from working and creates carcinogenic chemicals.
- Small fishless streams make up the majority of stream miles, but no buffers are required in OR.
- Post-fire salvage logging can encompass more acres than allowed in non-burned areas. This causes more sediment in the water and increased risk of landslide.
- Chemicals that are harmful to human health are used against rodents, insects, fungus, and other plants in Douglas Fir tree plantations. They are then detected in drinking water.
Costs of Water Treatment
Clean, protected forest waters are vital to rural and urban communities
Rockaway Beach Watershed now requires pre-treatment of sediment-laden water at Jetty Creek intake and installation of wells for summertime flow. COST: Over $2 million.
Extensive logging above Salem’s reservoir occurred before the algal bloom shut down the water system. Fertilizer, silt and warmer water are the likely cause. Cost for additional treatment: $75 million.
Prospects for change
Logging laws: Oregon’s Forest Practices Act is weaker than our neighbors. Because of our lack of stream management for salmon (larger buffers to cool the water and reduce sediment), we lose out on significant federal grants, while the salmon fishing industry suffers. The 2020 bill to increase no-spray buffers and provide notice of spraying was not enough. Further changes are needed, such as increased forested buffers to protect drinking water, pets and livestock from pesticides.
Managing forests for sustainability and resilience to hotter weather and drought will also result in more fire-resistant forests unlike plantations that burn more intensely. (Preserve multiple tree species, healthy understory, selective logging with smaller canopy breaks)