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Lower Trinity/Basin-wide |
Topic |
Sediment: Lower Trinity - Slide Volumes by Land Use 1979-2000 |
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Caption: This chart shows the percent of total sediment volume resulting from landslides in the Lower Trinity River Planning Watershed. Landslide data are limited to only part of entire watershed. Landslides are categorized by land use associations that include categories of road, harvest, or forest. Road and harvest landslides are considered management related. Forest slides were identified in non-managed areas. The Lower Trinity yields high volumes of sediment from landslides resulting from roads and timber harvest. There was a reduction in sediment production after the 1979 period that is attributed to a combination of lesser amounts of harvest on the USFS land, with substantially improved harvest implementation following the 1973 change in the Forest Practice Rules, and a lack of large storms. Data are from Graham Matthews and Associated Trinity River Sediment Source Analysis (2001). See Info Links for more information.
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sed_slides_type_lower_trinity_gma_1944_2000.dbf (size 608 bytes) .
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sed_slides_type_pw_trinity_gma_1944_2000.dbf (size 1,385 bytes)