Incorrect shapes returned by rapid watershed delineation (RWD)

[SRGDamia1]

Incorrect shapes are being returned by the RWD (watershed) endpoint.

Ex:
Delineating the point 40.54472997284455,-75.18346667289734

curl "https://staging.modelmywatershed.org/api/watershed/" -X POST -H "Authorization: Token xxxx" --data-raw "{""location"":[40.554462,-75.18302],""snappingOn"":true,""dataSource"":""drb""}"

returns the job result

{"input_pt": {"geometry": {"coordinates": [-75.182899, 40.554491], "type": "Point"}, "properties": {"Dist_moved": 1, "ID": 1, "Lat": 40.554462, "Lon": -75.18302}, "type": "Feature"}, "watershed": {"geometry": {"coordinates": [[[-75.17563, 40.555926], [-75.174982, 40.555741], [-75.174797, 40.555926], [-75.174149, 40.555926], [-75.173779, 40.555648], [-75.173316, 40.555648], [-75.171186, 40.554259], [-75.170538, 40.554352], [-75.169519, 40.553426], [-75.168038, 40.553611], [-75.167482, 40.553333], [-75.166186, 40.553333], [-75.165816, 40.553611], [-75.165353, 40.553611], [-75.165075, 40.553889], [-75.165075, 40.554167], [-75.164519, 40.554444], [-75.16239, 40.554444], [-75.161927, 40.55463], [-75.161464, 40.55463], [-75.161371, 40.554444], [-75.161186, 40.554444], [-75.160353, 40.554537], [-75.16026, 40.554722], [-75.158223, 40.554815], [-75.157945, 40.554444], [-75.156464, 40.554259], [-75.156279, 40.553981], [-75.155908, 40.553981], [-75.15563, 40.553796], [-75.154982, 40.553704], [-75.154519, 40.553981], [-75.154705, 40.553519], [-75.154705, 40.553333], [-75.154519, 40.553241], [-75.154705, 40.5525], [-75.154612, 40.552037], [-75.15489, 40.551852], [-75.155445, 40.551852], [-75.156093, 40.551481], [-75.156927, 40.551389], [-75.157019, 40.551204], [-75.15776, 40.551111], [-75.157853, 40.550926], [-75.158038, 40.550926], [-75.15813, 40.550648], [-75.158408, 40.550648], [-75.158593, 40.55037], [-75.158964, 40.55037], [-75.158964, 40.550185], [-75.159242, 40.550093], [-75.159242, 40.549815], [-75.159982, 40.54963], [-75.160167, 40.549259], [-75.161093, 40.549352], [-75.161464, 40.549074], [-75.161464, 40.548889], [-75.161834, 40.548889], [-75.161742, 40.548704], [-75.162112, 40.548704], [-75.161927, 40.5475], [-75.162019, 40.546944], [-75.161742, 40.546944], [-75.161556, 40.546481], [-75.161742, 40.546481], [-75.161649, 40.546111], [-75.162019, 40.546111], [-75.162205, 40.545741], [-75.161927, 40.545741], [-75.161834, 40.545556], [-75.161464, 40.545648], [-75.161279, 40.545463], [-75.161279, 40.545278], [-75.161464, 40.545185], [-75.161279, 40.54463], [-75.161742, 40.544352], [-75.162019, 40.543889], [-75.162297, 40.543796], [-75.162297, 40.543426], [-75.162482, 40.543241], [-75.16313, 40.543241], [-75.163501, 40.543519], [-75.163871, 40.543333], [-75.164056, 40.542963], [-75.164427, 40.54287], [-75.164334, 40.542407], [-75.164519, 40.542315], [-75.164519, 40.542037], [-75.164705, 40.542037], [-75.164705, 40.541667], [-75.164982, 40.541574], [-75.164982, 40.541111], [-75.165538, 40.541389], [-75.166556, 40.541296], [-75.167019, 40.541481], [-75.16776, 40.541204], [-75.167945, 40.541852], [-75.16813, 40.541852], [-75.168038, 40.542222], [-75.168316, 40.542222], [-75.168501, 40.5425], [-75.168964, 40.5425], [-75.169612, 40.54287], [-75.170445, 40.54287], [-75.170538, 40.543056], [-75.170816, 40.543056], [-75.171093, 40.543333], [-75.171464, 40.543333], [-75.171556, 40.543519], [-75.172205, 40.543519], [-75.172945, 40.544167], [-75.173038, 40.544444], [-75.173223, 40.544444], [-75.173223, 40.544722], [-75.173501, 40.545], [-75.173686, 40.544815], [-75.174334, 40.544815], [-75.174334, 40.545], [-75.174519, 40.545093], [-75.17489, 40.545], [-75.17526, 40.545278], [-75.176001, 40.545278], [-75.176093, 40.545463], [-75.176464, 40.545463], [-75.176834, 40.545833], [-75.177019, 40.545833], [-75.177482, 40.546574], [-75.178038, 40.546389], [-75.178779, 40.546574], [-75.180075, 40.546481], [-75.181001, 40.545556], [-75.181742, 40.545463], [-75.182482, 40.545093], [-75.18239, 40.544815], [-75.182575, 40.544722], [-75.182853, 40.544074], [-75.184056, 40.543611], [-75.18739, 40.543519], [-75.18989, 40.543704], [-75.18989, 40.543519], [-75.191556, 40.543426], [-75.191927, 40.543796], [-75.192297, 40.543796], [-75.192482, 40.544074], [-75.194242, 40.544074], [-75.19563, 40.545463], [-75.19563, 40.546019], [-75.196927, 40.546296], [-75.196927, 40.546481], [-75.197853, 40.546296], [-75.199334, 40.546481], [-75.199242, 40.546667], [-75.199519, 40.546759], [-75.199519, 40.547222], [-75.19989, 40.5475], [-75.199797, 40.548333], [-75.199982, 40.548426], [-75.199982, 40.548796], [-75.200167, 40.548889], [-75.200167, 40.549074], [-75.201001, 40.549722], [-75.201556, 40.549722], [-75.201093, 40.549907], [-75.201001, 40.550093], [-75.200816, 40.549907], [-75.199982, 40.549907], [-75.19989, 40.549722], [-75.199612, 40.549722], [-75.19813, 40.550185], [-75.197945, 40.55], [-75.19739, 40.550185], [-75.196834, 40.549815], [-75.195908, 40.549722], [-75.193223, 40.549907], [-75.192575, 40.550463], [-75.192019, 40.55037], [-75.191001, 40.551389], [-75.190723, 40.551389], [-75.190445, 40.551667], [-75.189705, 40.551667], [-75.189519, 40.551852], [-75.187945, 40.551667], [-75.187205, 40.55213], [-75.186186, 40.55213], [-75.186001, 40.551944], [-75.185353, 40.551852], [-75.18526, 40.551667], [-75.184612, 40.551667], [-75.184519, 40.55213], [-75.184056, 40.552222], [-75.183779, 40.5525], [-75.183779, 40.55287], [-75.183223, 40.553333], [-75.183223, 40.554352], [-75.182297, 40.555], [-75.181649, 40.554907], [-75.181464, 40.555093], [-75.181186, 40.555093], [-75.181186, 40.55537], [-75.179982, 40.555278], [-75.179519, 40.555648], [-75.175723, 40.555741], [-75.17563, 40.555926]]], "type": "Polygon"}, "properties": {"Area": 20.34667562, "AvgOLF": 0.184229641014657, "Avgslp": 0.115720748901367, "BR": 223.9205780029297, "BasinLen": 8.2393681640625, "DrnDen": 2.714004094271789, "GRIDCODE": 1, "RR": 0.027176911011338, "StrLen": 55.2209609375, "Strord": 5.0}, "type": "Feature"}}

The shape in the response looks like this:

Notice where the shape slices through the middle of the blue line in the south, cutting off a sizable upstream area.

Looking carefully at the RWD result, the shape properties give an area of 20.3 km^2. But the actual geojson shape that is returned (and fed further to analysis in the web app) only has an area of 3 km^3. There are 17 km^2 of the watershed missing.

[SRGDamia1]

I've combed through the RWD task chain, and I believe the error is in the RWD code itself.

[SRGDamia1]

This does not appear to be an issue with the delineation on the NHD medium resolution layer.