Sample areas
Figure 1 shows the areas chosen for sample NHD data in an attempt to capture a wide variety of features. The feature tables were combined for each later, and a count produced of each unique FCode for each layer. Results presented below
Line features
Frequency
FCode
Description
1090
41100
Nonearthen Shore
691
50302
Sounding Datum Line: Positional Accuracy = Definite
292
34306
Dam/Weir: Construction Material = Nonearthen
220
34305
Dam/Weir: Construction Material = Earthen
95
43400
Reef
95
47800
Tunnel
80
36200
Flume
34
50301
Sounding Datum Line: Positional Accuracy = Approximate
13
36900
Gate
7
48300
Wall
1
53301
Special Use Zone Limit: Positional Accuracy = Definite
1
31800
Bridge
FlowLines
Frequency
FCode
Description
49609
46003
Stream/River: Hydrographic Category = Intermittent
21441
46006
Stream/River: Hydrographic Category = Perennial
19506
55800
Artificial Path
10269
33600
Canal/Ditch
5250
56600
Coastline
4071
46007
Stream/River: Hydrographic Category = Ephemeral
2854
33400
Connector
410
42803
Pipeline: Pipeline Type = Aqueduct; Relationship to Surface = Underground
306
46000
Stream/River
241
42807
Pipeline: Pipeline Type = General Case; Relationship to Surface = Underground
171
42813
Pipeline: Pipeline Type = Siphon
109
42801
Pipeline: Pipeline Type = Aqueduct; Relationship to Surface = At or Near
60
33601
Canal/Ditch: Canal/Ditch Type = Aqueduct
46
42802
Pipeline: Pipeline Type = Aqueduct; Relationship to Surface = Elevated
39
42823
Pipeline: Pipeline Type = Stormwater; Relationship to Surface = Underground
2
42811
Pipeline: Pipeline Type = Penstock; Relationship to Surface = Underground
2
33603
Canal Ditch: Canal Ditch Type = Stormwater
1
42809
Pipeline: Pipeline Type = Penstock; Relationship to Surface = At or Near
1
42800
Pipeline
Areas
Frequency
FCode
Description
835
36400
Foreshore
373
46006
Stream/River: Hydrographic Category = Perennial
237
40307
Inundation Area: Inundation Control Status = Not Controlled
210
48400
Wash
65
33600
Canal/Ditch
36
44500
Sea/Ocean
18
45500
Spillway
16
34306
Dam/Weir: Construction Material = Nonearthen
10
33601
Canal/Ditch: Canal/Ditch Type = Aqueduct
8
46003
Stream/River: Hydrographic Category = Intermittent
4
40308
Inundation Area: Inundation Control Status = Controlled
4
40309
Inundation Area: Inundation Control Status = Controlled; Stage = Flood Elevation
2
46100
Submerged Stream
2
37300
Hazard Zone
1
45403
Special Use Zone: Special Use Zone Type = Spoil Area; Operational Status = Operational
1
39800
Lock Chamber
1
34305
Dam/Weir: Construction Material = Earthen
Water Bodies
Frequency
FCode
Description
15904
39004
Lake/Pond: Hydrographic Category = Perennial
5852
39001
Lake/Pond: Hydrographic Category = Intermittent
2827
46600
Swamp/Marsh
346
43607
Reservoir: Reservoir Type = Evaporator
321
43624
Reservoir; Reservoir Type = Treatment
280
39009
Lake/Pond: Hydrographic Category = Perennial; Stage = Average Water Elevation
264
43613
Reservoir: Reservoir Type = Water Storage; Construction Material = Nonearthen
255
43612
Reservoir: Reservoir Type = Sewage Treatment Pond
168
43601
Reservoir: Reservoir Type = Aquaculture
92
36100
Playa
85
43600
Reservoir
58
43623
Reservoir: Reservoir Type = Evaporator; Construction Material = Earthen
33
43606
Reservoir: Reservoir Type = Disposal
25
43610
Reservoir: Reservoir Type = Filtration Pond
24
39012
Lake/Pond: Hydrographic Category = Perennial; Stage = Spillway Elevation
18
43609
Reservoir: Reservoir Type = Cooling Pond
15
37800
Ice Mass
13
39010
Lake/Pond: Hydrographic Category = Perennial; Stage = Normal Pool
7
43619
Reservoir: Construction Material = Nonearthen
6
43604
Reservoir: Reservoir Type = Tailings Pond; Construction Material = Earthen
6
43617
Reservoir: Reservoir Type = Water Storage
3
43621
Reservoir: Reservoir Type = Water Storage; Hydrographic Category = Perennial
3
39005
Lake/Pond: Hydrographic Category = Intermittent; Stage = High Water Elevation
1
43625
Reservoir: Reservoir Type = Disposal; Construction Material = Earthen
1
43618
Reservoir: Construction Material = Earthen
Points
Frequency
FCode
Description
3104
45800
Spring/Seep
1869
48800
Well
581
44101
Rock: Relationship to Surface = Abovewater
103
36700
Gaging Station
39
45000
Sink/Rise
31
48700
Waterfall
10
44102
Rock: Relationship to Surface = Underwater
7
48500
Water Intake/Outflow
2
43100
Rapids
2
39800
Lock Chamber
