For some of the missing waterways I created manually, it looked like the NHD had the stretch as a polygon that either didn’t get imported, or did but was tagged as some kind of river bank and got deleted after the fact. And the ArtificialPath down the middle never existed. But then, yeah, a lot of the missing segments, there’s nothing in the way…
Looking at lakes and streams in Oklahoma, there are:
| NHD:FCode | Count | Count currently having intermittent | Wiki |
|---|---|---|---|
| 46003 | 60,224 | 885 | STREAM/RIVER waterway=stream intermittent=yes Hydrographic Category intermittent |
| 46006 | 26,457 | 335 | STREAM/RIVER waterway=stream Hydrographic Category perennial |
| 39004 | 109,721 | 29 | LAKE/POND natural=water Hydrographic Category perennial |
| 55800 | 16,814 | 13 | ARTIFICIAL PATH |
| 39001 | 6,756 | 15 | LAKE/POND natural=water intermittent=yes Hydrographic Category intermittent |
| 39009 | 530 | 2 | LAKE/POND natural=water Hydrographic Category perennial; stage average water elevation |
| 33400 | 250 | 1 | CONNECTOR |
So, I think that would be (?)
- 59,399 waterways with NHD:FCode=46003 that need intermittent=yes
- 6,741 water bodies with NHD:FCode=39001that need intermittent=yes
What do you think?