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Use ArcCatalog to load additional databases (this will drop the network, which can be rebuilt as <br />described below). Alternatively, use ArcMap to load additional databases; however, this will run <br />much slower since the network is maintained during the load. <br />After loading the data, remove duplicate features where adjacent databases have the same <br />features. Do so by first selecting duplicate ComID values within a feature class. <br />Rebuild the network with ArcCatalog using a tool available in ArcHydro or use a utility available <br />from the USGS, which will rebuild the network and set the flow direction. <br />Table 3.1. NHD Downloads by Subregion <br /># File Name HU 4 Name Zi Size, MB MDB Size, MB <br />1 NHDM1018.zip North Platte 42.00 <br />2 NHDM1019.zip South Platte 21.50 94.90 <br />3 NHDM1025.zip Republican 25.60 <br />4 NHDM1026.zip Smoky Hill 32.90 <br />5 NHDM1102.zip Upper Arkansas 18.00 <br />6 NHDM1103.zip Middle Arkansas 24.50 <br />7 NHDM1104.zi U er Cimarron 10.60 <br />8 NHDM1108.zip Upper Canadian 10.00 <br />9 NHDM1301.zip Rio Grande Headwaters 7.54 <br />10 NHDM1302.zip Rlo Grande- <br />Ele hant Butte 22 70 <br />11 NHDM1401.zip Colorado Headwaters 12.80 <br />12 NHDM1402.zip Gunnison 8.30 <br />13 NHDM1403.zip Upper Colorado- <br />Dolores 14.30 <br />14 NHDM1404.zip Great Divide- <br />U er Green 35.50 <br />15 NHDM1405.zip White-Yampa 19.00 <br />16 NHDM1406.zip Lower Green 37.20 <br />17 NHDM1408.zi San Juan 23.00 <br />Total 365.44 1610 (estimated) <br />Although "local resolution" (typically SK or better) may be available, it is recommended that the highest <br />resolution data be used, up to 24K resolution. It is likely that a statewide NHD database will be several <br />GB in size. Therefore, performance and use should be evaluated to determine that the data can be used <br />seamlessly with various tools. <br />A merged NHD for the South Platte Basin will provide a stream network that can be linked to HydroBase <br />features, as discussed in the following sections. <br />3.2 Linking NHD with HydroBase Stream Data <br />As discussed in the Introduction above, the HydroBase stream and wd water tables contain records for <br />water bodies that are the source of water for water rights and structures. Most of the records are for <br />surface water streams; however, some records are for ground water, including aquifers and springs. The <br />tables do not contain a "type" field to indicate the type of water body, although this information likely <br />could be backfilled with some degree of success from associated structures and water rights. Springs <br />(276 records) usually can be identified by a specific name but in many cases, the name is simply <br />"SPRING". Aquifers (46 records) typically are identified as one of the main aquifers in the State. <br />Groundwater identified by "GROUNDWATER" in the name (79 records) typically are associated with <br />Page 9 of 17 ~IZlverslde Technnlo~yv Inc. <br />4s':rkv Resuurce.s Ergmee: mg end ~C9 nsuNrng <br />