NHDPlus V 2 Content Cindy Mc Kay NHDPlus

NHDPlus. V 2 Content Cindy Mc. Kay NHDPlus Training Series 0

Objectives � Understand the Source Datasets from which NHDPlus. V 2 is built � Learn what datasets are found within NHDPlus. V 2 Objectives 1

Agenda � Source Datasets � NHDPlus. V 2 Content Agenda 2

NHDPlus. V 2 Begins with: NHD, WBD, and NED National Hydrography Dataset (NHD) Watershed Boundary Dataset (WBD) National Elevation Dataset (NED/3 DEP) Source Datasets 3

Source Data Snapshots NEDSnapshot Digital Elevation Model NHDSnapshot • Stream Network • Waterbodies • Feature Names WBDSnapshot Hydrologic Unit Boundaries Source Datasets 4

NHD Source Datasets nhd. usgs. gov 5

NHDPlus. V 2 – NHD � 1: 100, 000 -scale, Medium Resolution � EPA is the data steward � NHD Snapshot – April 2010 � Many updates for NHDPlus: ◦ Feature names ◦ Network connectivity ◦ Additional waterbodies � NHDPlus contains the most up-to-date 1: 100, 000 scale hydrography Source Datasets 6

NHD Information Content Stream Network (80% of NHD Features) ATTRIBUTES • Feature Name • GNIS ID • Feature Type • Reachcode • Feature Length • Flow Direction • Containing Waterbody ID NHDFlowline Feature Class FEATURE TYPES • Stream/River • Canal/Ditch • Pipeline • Artificial Path • Connector 1 2 • Coastline 3 Source Datasets “Network Flow” Relationships 1 2 3 3 7

NHD Information Content Waterbodies & Areas (14% of NHD Features) NHDWaterbody Feature Class • • Lake/Pond Swamp/Marsh Reservoir Playa Ice Mass Wash Estuary NHDArea Feature Class • • Stream/River Canal/Ditch Area of Complex Channel Sea/Ocean Source Datasets • • • ATTRIBUTES Feature Name GNIS ID Feature Type Reachcode Feature Area Artificial Paths are the flow paths through Waterbodies and Areas. 8

NHD Information Content Landmark (6% of NHD Features) NHDLine Feature Class • Dam • Lock • Rapids • Etc… NHDPoint Feature Class • Dam • Sink • Spring • Fumarole • Etc… Source Datasets • ATTRIBUTES • Feature Name • GNIS ID • Feature Type • Feature Area 9

NHDPlus. V 2 – WBD 2011 -12 (nhd. usgs. gov) WBD is now part of the NHD database. And also hosted by NRCS. NHDPlus. V 2 used 7 snapshots of WBD. Source Datasets 10

Hydrologic Units – (HUC 2, 2 -digit HUC) 19 20 22 Source Datasets 21 11

HUC 4, 4 -digit HUC - 202 Example 1201 Source Datasets 12

HUC 6, 6 -digit HUC - 336 Example 120101 Source Datasets 13

HUC 8, 8 -digit HUC - 2121 Example 12010101 Source Datasets 14

HUC 10, 10 -digit HUC - 15, 945 Example 120101 Source Datasets 15

HUC 12, 12 -digit HUC, Level 6 HUC 86, 123 Example 12010101 Source Datasets 16

NHDPlus. V 2 – NED 2011 -12 (ned. usgs. gov) 30 m re-sampled from 10 and 3 meter NHDPlus. V 2 used 5 snapshots of NED. Source Datasets 17

NHDPlus. V 2 Content Source Snapshots NEDSnapshot Digital Elevation Model NHDSnapshot • Stream Network • Waterbodies • Feature Names WBDSnapshot Hydrologic Unit Boundaries NHDPlus. V 2 Content 18

NHDPlus. V 2 – Content Elev_cm Fdr & Fac Fdr. Null Cat. Seed Filled. Areas Hydrodem Cat Feature. IDGrid. Code Plus. Flowline. VAA Cumulative. Area Div. Frac. MP Mega. Div Elev. Slope Plus. Flow Catchment NHDFlowline NHDWaterbody Plus. ARPoint. Event Plus. Flow. AR Burn Components EROMMA & EROMMMnn Catchment Attributes WBD_Subwatershed NHDPlus. V 2 Content Drainage Area Attributes 1 9

Vector Layers Burn Components Burn. Line. Event Burn. Waterbody Burn. Add. Line Burn. Add. Waterbody Catchment Land. Sea Sink NHDPlus V 2 Content 20

Raster Layers Fdr Flow Direction Fac Flow Accumulation Cat. Seed Filled. Areas Fdr. Null Hydrodem Cat NHDPlus. V 2 Content Cat Seed Filled Areas Fdr. Null Hydro-enforced DEM Catchments 21

Value Added Attributes 1. Plus. Flowline. VAA 2. Elev. Slope Elevation & Slope 3. Head. Water. Node. Area Attributes Allocated to Catchments 5. Drainage Attributes Mean Annual Flow/Velocity 7. EROM_MM NHDPlus. V 2 Content Commonly called “The Network VAAs” Area Draining to Headwater Node 4. Catchment Attributes Total Upstream Attributes 6. EROM_MA Mean Monthly Flows/Velocities 22

Resources Additional information on NHDPlus is available from the NHDPlus website documentation page. You are encouraged to read and reference the NHDPlus. V 21 User Guide and other NHDPlus documentation. � � The NHDPlus team maintains a user email list and periodically sends emails regarding new tools, data, documentation, and events. If you would like to be on the user list, send an email to nhdplus-support@epa. gov The NHDPlus team also provides technical support to users of the data and tools. If you have a technical support question, please send a detailed email to nhdplussupport@epa. gov 23

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