National Hydrography Dataset (NHD) Areas

Abstract

NHD Areas represents bodies of water such as rivers, bays, oceans, and miscellaneous features such as rapids and spillways. Water bodies such as lakes and reservoirs, as well as wetlands are in a different data set.

Purpose

The NHD was created to assist scientists in modeling hydrologic features and is also useful for cartographic mapping purposes. The geometric features that came from the USGS DLG files, combined with the flow direction, reach codes, and other attributes taken from the EPA RF3 file, make the NHD a powerful modeling tool.

Time Period of Content

Beginning date: 1990s
Ending date: 2016

Publish Date

2016-05-11

Originator

USGS, Florida Water Management Districts, Florida Department of Environmental Protection

Publisher

Florida Department of Environmental Protection

Theme Keywords

hydrography, water, lakes, streams, rivers, estuaries

Place Keywords

Florida

Source Scale

1:24,000

Horizontal Accuracy

Estimated to meet 1:24,000 National Map Accuracy Standards (+/- 40 feet)

Vertical Accuracy

If the source for elevation is 7.5 minute topo map, estimated to be one half of a contour, or +/- 2.5 feet.

Process Steps

Format

ESRI File Geodatabase

Format Details

Projection

Albers Florida HARN

Field Names

permanent_identifier = Unique ID

fdate = Date of last feature modification.

resolution = Source resolution. All values = 2

Code	Description1	Description2
1	Local	>1:12,000
2	High	1:24,000/12,000
3	Medium	1:100,000

gnis_id = USGS Geographic Names Information System (GNIS) ID

gnis_name = USGS Geographic Names Information System (GNIS) Name

areasqkm

elevation = Feature elevation (Integer)

ftype = 3-digit feature code. (Integer)

Code	Description
312	BayInlet
336	CanalDitch
343	DamWeir
364	Foreshore
398	Lock Chamber
431	Rapids
445	SeaOcean
455	Spillway
460	StreamRiver

fcode = 5-digit feature code. Extra two digits provide a more detailed description of the feature. (Integer)

Distribution Info

http://geodata.dep.state.fl.us/

http://publicfiles.dep.state.fl.us/otis/gis/data/FLORIDA_NHD.zip