1. Increases the risk of flooding because streams and stormwater facilities that receive excessive sediment have a reduced capacity to convey water;

2. Damages fisheries when siltation clogs spawning gravel and when excessive turbidity impairs the feeding ability of aquatic animals;

3. Increases public expenditures for maintenance of stormwater facilities that receive excessive amounts of sediment;

4. Damages adjacent properties, including public rights-of-way, when sediment is deposited on these properties;

5. Increases public expenditures for cleaning and maintaining roadway surfaces that receive excessive sediment;

6. Promotes transport of nutrients to lakes causing algal blooms and oxygen depletion; and

7. Causes detrimental water quality problems to Burnt Bridge Creek, Vancouver Lake Lowlands and water quality impacts to the Columbia River.