Qualifiers from Graham Matthews and Associates (2001) Sediment Source Analysis for the Mainstem Trinity River for data shown in KRIS charts are:

1. Non-management landslides are those mapped as occurring in brush and forest areas, apparently not related to disturbance. Since USFS harvest areas are not available in GIS format, landslides occurring in older harvest areas may be shown as non-management.
2. Harvest-related landslide category includes all those occurring in harvested areas as determined by mapping of Six Rivers National Forest, or digitizing of DWR (1980) harvest maps and digitizing of CDF THP data for 1979-2001.
3. Road-related landslides includes all slides judged to have been caused by road construction including changes to drainage patterns.
4. Landslide values for Campbell, Hoopa, Supply, and Willow Creek based on 1979 data. Landslides in Horse Linto, Mill, and Tish Tang from the Six Rivers National Forest 1975 mapping period.
5. Sample plot data were developed from 40 randomly distributed 40-acre sample plots, mostly located in the Upper Middle Trinity. All sources of sediment on these plots were mapped. Erosion from existing system roads was assumed to be accounted for in other road categories and is not included.
6. Sample plot data indicate a non-management sediment delivery of 110tons/mi2/yr from various sources including small slides, channel bank erosion, and rilling.
7. Legacy roads are computed at 26 tons/mi2/yr from sample plot data and includes: abandoned roads causing sediment delivery via cut and fill slope failures, and gullies.
8. Harvest -related surface erosion is computed using 4 tons/acre, except for harvest on Shasta Bally Batholith areas, which was assigned a rate of 40 tons/acre.
9. Road surface erosion is based on101.75 miles of road inventories conducted in Trinity River watershed in 2001.
10. Legacy mining includes: gullies and small slides from historic ditches used to transport water to hydraulic mining sites. 2 miles of ditches were field inventoried to develop rates of 49 ton/mi/yr for slides and 23 tons/mi/yr for gullies.
11. Creep was estimated at 30 tons/mi2/yr, based on a significant reduction from coastal rates due to much more stable geology and lower uplift rates. Coastal rate of 75 tons/mi2/yr was based on work of Roberts and Church (1986) and Stillwater Sciences (1999).
12. Bank erosion computed using rates set for each stream order, based on field verification of rates in order 3, 4, 5 channels. 24 miles of channels were walked. Only sites larger than 10CY recorded, so this values does not include creep.