Referencing and Analyzing Dams with the National Hydrography Dataset Jeff Simley, U.S. Geological Survey Bill Smith, U.S. Geological Survey.

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Presentation transcript:

Referencing and Analyzing Dams with the National Hydrography Dataset Jeff Simley, U.S. Geological Survey Bill Smith, U.S. Geological Survey

You're visitor since 01/25/1999 and 10 for today 08/04/2006

Dam Network upstream of dam blocked by dam Upstream navigation start Red: Everything upstream

90 ft. NID dam location Edited dam location Indexed dam location Lake Dam address: Reach: Measure:

NID dam location is reasonable

Correct location for purposes of the NHD

Look at dam name and river name to determine where the dam belongs NID location

Look at NHD name and flow

Moved dam here to get proper indexing result

NID Dam location Assumed correct dam location

NID location Assumed location Use name to aide decision

Easily made assumption of correct dam location based on graphics Use name to confirm

Assume location simply by stream name Assume location at nearest spot with only stream name for guidance

No evidence of a dam

No evidence of dam

Non-indexable Dam location

NID dam right on stream looks like a hit, but no evidence of a dam in imagery

Three NID dams with no evidence in imagery

Assume dam belongs on lake NID location Indexed location Lake

NID location almost right on stream, but no evidence dam, except possibly nearby lakes

Dam NID location

Dam and lake not connected to NHD network No point in indexing this, but may want to improve location of dam

Can’t find the lake this dam belongs to

Make assumption of dam location based on name and graphics

Actually have dam in NHD to confirm location

Not enough information in location or stream name to Make decision Not enough information in location or stream name to make decision on correct location

Dam near wrong flowline for proper position

Dam has two outlets in NHD

Dam has two outlets in NHD

Dam has two outlets in NHD

Dam has two outlets on map, but only one in NHD

Two streams impounded by one dam

Two NID dams Two NHD flowlines Unclear what second dam does

Question of where exactly to index dams

Lake has two outlets

Create dummy dam Move NID dam

Moved dam and indexed Created dummy dam and indexed

Use flow direction to determine dam location at just one outlet point

Two outlets, but only one dam

Two dams represented by one NID dam

Corrected dam location Dummy dam Non-indexable dam

Indexing results with 50 ft tolerance All but non-connected dams have indexed

Properly indexed dams

Dams on Colorado River system upstream of Blue River confluence

Colorado River system dams with normal storage of over 1,000 acre-feet

Dams upstream of Blue River confluence with normal storage over 2,000 acre-feet

Dams upstream of Blue River confluence Built before 1960