Eastern Snake Plain Aquifer: Tributary Basins

This dataset contains portions of the HUC8 watersheds, and in some cases the HUC10 watersheds, that are coincident with the Snake Headwaters (HUC6-170401) and the Upper Snake (HUC6-170402) watersheds, excepting the Salmon Falls (HUC8-1704213) and a portion of the Upper Snake-Rock (HUC8-17040212) watersheds. The Watershed Boundary Dataset (WBD) was accessed on December 20, 2023. https://hydrowfs.nationalmap.gov/arcgis/rest/services/wbd/MapServer The Upper Henrys (HUC8-17040202) and Lower Henrys (HUC8-17040203) watersheds were merged into one tributary basin and named Henry’s Fork. The Big Cottonwood Creek (HUC10-1704021202) watershed was included. Portions of watersheds that are coincident with the Eastern Snake Plain Aquifer Model (ESPAM) 2.1 active model domain were replaced with the ESPAM2_ModelGrid_boundary shapefile using the Erase and Append GP tools. (ESPAM2_ModelGrid_boundary.shp represents the ESPAM2.1, and according to the Hydrology Section Technical Engineer 2, the model boundary is the same for ESPAM2.2 and ESPAM2.1.) This process created slivers in several HUC8 watersheds along the outer edge of the ESPA Model Boundary, and these slivers (area < 40 sq km) were merged into a nearby HUC8 as follows: One portion of the Beaver-Camas (HUC8-17040214) into the Henry’s Fork tributary basin. Two portions of the Teton (HUC8-17040204) into the Henry’s Fork tributary basin. One portion of the Little Wood (HUC8-17040221) into the Big Wood (HUC8-17040219). One portion of the Big Lost (HUC8-17040218) into the Little Lost (HUC8-17040217). Two portions of the Idaho Falls (HUC8-17040201) into Palisades (HUC8-17040104). One portion of the Idaho Falls (HUC8-17040201) into Willow (HUC8-17040205). Two portions of the Idaho Falls (HUC8-17040201) into Teton (HUC8-17040204). The following tributary basins were broken out from Lake Walcott (HUC8-17040209): Wagon Butte was re-named from HUC10-1704020910. Marsh was re-named from the largest of the three HUC10 watersheds that intersect (HUC10-1704020906). The other HUC10 watersheds are Brigham Point-Snake River (HUC10-1704020904) and Milner Dam-Snake River (HUC10-1704020913). Rock was re-named from the largest of the three HUC10 watersheds that intersect (HUC10-1704020901). The other HUC10 watersheds are Massacre Rocks-Snake River (HUC10-1704020903) and a small portion of Brigham Point-Snake River (HUC10-1704020904). The following tributary basin was broken out from the Upper Snake-Rock (HUC8-17040212): Clover was re-named from HUC10-1704021212. The following tributary basins were not broken out from HUC8 watersheds: Ross Fork (HUC10-1704020806) was not broken out from the Portneuf (HUC8-17040208). Thorn Creek (HUC10-1704021908) was not broken out from the Big Wood (HUC8-17040219). This dataset was created using the following steps: 1. Select the HUC8 watersheds that are coincident with the Snake Headwaters (HUC6-170401) and the Upper Snake (HUC6-170402) watersheds. Export the selection to a new feature class (25 records). 2. Select the Big Cottonwood Creek (HUC10-1704021202) watershed. Export the selection to a new feature class (1 record). 3. Use the Append GP tool to append the Big Cottonwood Creek feature class created in Step 2 to the HUC8 watersheds selection feature class created in Step 1. 4. Use the Erase GP tool to cut out the ESPA model boundary from the HUC8 watersheds selection feature class. 5. Use the Multipart to Singlepart GP tool on the feature class created in Step 4. 6. Use the Append GP tool to append the ESPA model boundary to the feature class created in Step 5. This feature class will be modified with Steps 7-9. 7. Delete those portions of the Salmon Falls (HUC8-1704213) and Upper Snake-Rock (HUC8-17040212) watersheds that fall outside of the ESPA model boundary. 8. Use the Modify Features: Merge Features editing tool to merge certain features as documented above. 9. Re-name certain features based on HUC10 watersheds as documented above. 10. Modify the attribute table by adding and populating the following fields: Ref_HUC8 Ref_HUC10 Ref_Name LabelName 11. Modify the attribute table by removing the following fields: TNMID METASOURCEID SOURCEDATADESC SOURCEORIGINATOR SOURCEFEATUREID LOADDATE GNIS_ID AREAACRES AREASQKM STATES HUC8 ORIG_FID 12. Use the Project GP Tool to project the feature class to NAD 1983 Idaho TM (Meters). 13. Export as a shapefile.本数据集包含与斯内克河源头（HUC6-170401）及上斯内克河（HUC6-170402）流域重合的部分HUC8流域，部分场景下还包含HUC10流域，但排除萨蒙福尔斯（HUC8-1704213）流域以及上斯内克-罗克（HUC8-17040212）流域的部分区域。 流域边界数据集（Watershed Boundary Dataset, WBD）的获取时间为2023年12月20日，访问地址为https://hydrowfs.nationalmap.gov/arcgis/rest/services/wbd/MapServer。 上亨利斯（HUC8-17040202）与下亨利斯（HUC8-17040203）流域被合并为一个支流流域，并命名为亨利斯福克。本次数据集同时包含大卡顿伍德溪（HUC10-1704021202）流域。 与东蛇河平原含水层模型2.1（Eastern Snake Plain Aquifer Model 2.1, ESPAM 2.1）活动模型域重合的流域区域，已通过地理处理（Geoprocessing, GP）擦除（Erase）与追加（Append）工具，替换为ESPAM2_ModelGrid_boundary形状文件。注：ESPAM2_ModelGrid_boundary.shp代表ESPAM2.1版本；据水文部门二级技术工程师信息，ESPAM2.2与ESPAM2.1的模型边界完全一致。 该处理流程在ESPA模型边界外缘的多个HUC8流域中生成了狭长细碎多边形（面积小于40平方千米），现将这些细碎多边形按照如下规则合并至邻近的HUC8流域： 1. 比弗-卡马斯（HUC8-17040214）的1个片区合并至亨利斯福克支流流域； 2. 提顿（HUC8-17040204）的2个片区合并至亨利斯福克支流流域； 3. 小伍德（HUC8-17040221）的1个片区合并至大伍德（HUC8-17040219）； 4. 大洛斯特（HUC8-17040218）的1个片区合并至小洛斯特（HUC8-17040217）； 5. 爱达荷福尔斯（HUC8-17040201）的2个片区合并至帕利塞兹（HUC8-17040104）； 6. 爱达荷福尔斯（HUC8-17040201）的1个片区合并至威洛（HUC8-17040205）； 7. 爱达荷福尔斯（HUC8-17040201）的2个片区合并至提顿（HUC8-17040204）。 从沃尔科特湖（HUC8-17040209）中拆分出以下支流流域： - 瓦贡比尤特：由HUC10-1704020910重命名而来； - 马什：由3个相交HUC10流域中面积最大的HUC10-1704020906重命名而来，其余两个相交HUC10流域为布里格姆角-斯内克河（HUC10-1704020904）与米尔纳大坝-斯内克河（HUC10-1704020913）； - 罗克：由3个相交HUC10流域中面积最大的HUC10-1704020901重命名而来，其余两个相交HUC10流域为大屠杀岩-斯内克河（HUC10-1704020903）与布里格姆角-斯内克河（HUC10-1704020904）的小部分区域。 从上斯内克-罗克（HUC8-17040212）中拆分出以下支流流域： - 克洛弗：由HUC10-1704021212重命名而来。 以下支流流域未从所属HUC8流域中拆分： - 罗斯福克（HUC10-1704020806）未从波蒂纳夫（HUC8-17040208）中拆分； - 索恩溪（HUC10-1704021908）未从大伍德（HUC8-17040219）中拆分。 本数据集通过以下步骤创建： 1. 筛选与斯内克河源头（HUC6-170401）及上斯内克河（HUC6-170402）流域重合的HUC8流域，将筛选结果导出为新要素类（共25条记录）。 2. 筛选大卡顿伍德溪（HUC10-1704021202）流域，将筛选结果导出为新要素类（共1条记录）。 3. 使用地理处理（Geoprocessing, GP）追加（Append）工具，将步骤2生成的大卡顿伍德溪要素类追加至步骤1生成的HUC8流域筛选要素类中。 4. 使用地理处理（GP）擦除（Erase）工具，从步骤3生成的要素类中剔除ESPA模型边界区域。 5. 对步骤4生成的要素类执行多部件转单部件（Multipart to Singlepart）地理处理工具。 6. 使用地理处理（GP）追加工具，将ESPA模型边界追加至步骤5生成的要素类中，该要素类将通过步骤7至步骤9进行修改。 7. 删除萨蒙福尔斯（HUC8-1704213）与上斯内克-罗克（HUC8-17040212）流域中位于ESPA模型边界外的部分区域。 8. 使用要素编辑工具中的合并要素（Merge Features）功能，按照前文所述规则合并指定要素。 9. 根据前文所述的HUC10流域信息，对指定要素进行重命名。 10. 修改属性表，添加并填充以下字段：Ref_HUC8、Ref_HUC10、Ref_Name、LabelName。 11. 修改属性表，移除以下字段：TNMID、METASOURCEID、SOURCEDATADESC、SOURCEORIGINATOR、SOURCEFEATUREID、LOADDATE、GNIS_ID、AREAACRES、AREASQKM、STATES、HUC8、ORIG_FID。 12. 使用地理处理（GP）投影（Project）工具，将要素类投影至NAD 1983爱达荷横轴墨卡托（米）坐标系。 13. 导出为形状文件。