25:
215:
151:
the source of the data. The identifier is used in an addressing system to link specific information about the water such as water discharge, water quality, and fish population. Using the basic water features, flow network, linked information, and other characteristics, it is possible to study cause and effect relationships, such as how a source of poor water quality upstream might affect a fish population downstream.
169:. The dataset primarily maps features a 1:24,000-scale, but in certain areas provides detail at 1:5,000-scale. A version of the NHD called the NHDPlus is integrated with elevation and other landscape data to create detailed drainage catchments and flow volume and velocity estimates for streams and rivers of the U.S. at 1:100,000-scale. This data is available from the
150:
technology. This takes advantage of a flow direction network that can be processed to trace the flow of water downstream. A rich set of attributes used to identify the water features includes an identifier, the official name of the feature, the length or area of the feature, and metadata describing
133:
Cartographers can link to or download the NHD to use in their computer mapping software. The NHD is used to represent surface water on maps and is also used to perform geospatial analysis. It is a digital vector geospatial dataset designed for use in
146:
In mapping, the NHD is used with other data themes such as elevation, boundaries, and transportation to produce general reference maps. In geospatial analysis the NHD is used by scientists using
138:(GIS) to analyze the flow of water throughout the nation. The dataset represents over 7.5-million miles of streams/rivers and 6.5-million lake/ponds.
170:
256:
203:
Simley, J.D., Carswell Jr., W.J., 2009, The
National Map—Hydrography: U.S. Geological Survey Fact Sheet 2009-3054, 4 p.
68:
46:
39:
155:
135:
249:
161:
for the United States. The NHD is also linked with similar datasets representing the surface water for
230:
280:
33:
242:
50:
275:
8:
158:
226:
269:
122:
90:
118:
222:
86:
192:
102:
214:
166:
162:
110:
106:
98:
114:
94:
147:
187:
16:
Digital database of water features of the United States
93:used to make maps. It contains features such as
267:
250:
171:United States Environmental Protection Agency
257:
243:
69:Learn how and when to remove this message
32:This article includes a list of general
268:
209:
18:
13:
38:it lacks sufficient corresponding
14:
292:
181:
213:
23:
156:United States Geological Survey
193:http://nhd.usgs.gov/tools.html
136:geographic information systems
128:
1:
176:
229:. You can help Knowledge by
83:National Hydrography Dataset
7:
10:
297:
208:
198:
141:
154:The NHD is part of the
53:more precise citations.
188:http://nhd.usgs.gov/
85:(NHD) is a digital
238:
237:
79:
78:
71:
288:
259:
252:
245:
217:
210:
159:The National Map
74:
67:
63:
60:
54:
49:this article by
40:inline citations
27:
26:
19:
296:
295:
291:
290:
289:
287:
286:
285:
281:Hydrology stubs
266:
265:
264:
263:
206:
201:
184:
179:
144:
131:
75:
64:
58:
55:
45:Please help to
44:
28:
24:
17:
12:
11:
5:
294:
284:
283:
278:
262:
261:
254:
247:
239:
236:
235:
218:
200:
197:
196:
195:
190:
183:
182:External links
180:
178:
175:
143:
140:
130:
127:
91:water features
77:
76:
31:
29:
22:
15:
9:
6:
4:
3:
2:
293:
282:
279:
277:
274:
273:
271:
260:
255:
253:
248:
246:
241:
240:
234:
232:
228:
225:article is a
224:
219:
216:
212:
211:
207:
204:
194:
191:
189:
186:
185:
174:
172:
168:
164:
160:
157:
152:
149:
139:
137:
126:
124:
123:United States
120:
116:
112:
108:
104:
100:
96:
92:
88:
84:
73:
70:
62:
59:December 2021
52:
48:
42:
41:
35:
30:
21:
20:
231:expanding it
220:
205:
202:
153:
145:
132:
119:stream gages
82:
80:
65:
56:
37:
276:Hydrography
129:Description
89:of surface
51:introducing
270:Categories
177:References
34:references
223:hydrology
121:for the
87:database
199:Reading
142:Mapping
103:streams
47:improve
167:Mexico
163:Canada
111:canals
107:rivers
36:, but
221:This
99:ponds
95:lakes
227:stub
165:and
117:and
115:dams
81:The
148:GIS
272::
173:.
125:.
113:,
109:,
105:,
101:,
97:,
258:e
251:t
244:v
233:.
72:)
66:(
61:)
57:(
43:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
