Allegheny County Hydrology Lines

<p><span style='font-size:10.0pt;
line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:
yes'>The Hydrology Feature Dataset contains photogrammetrically compiled water
drainage features and structures including rivers, streams, drainage canals,
locks, dams, lakes, ponds, reservoirs and mooring cells. Rivers, Lakes, Ponds,
Reservoirs, Hidden Lakes, Reservoirs or Ponds: If greater than 25 feet and less
than 30 feet wide, is captured as a double line stream. If greater than 30 feet
wide it is captured as a river. Lakes are large standing bodies of water
greater than 5 acres in size. Ponds are large standing bodies of water greater
than 1 acre and less than 5 acres in size. Polygons are created from Stream
edges and River Edges.<span style='mso-spacerun:yes'>  </span>The Ohio River,
Monongahela River and Allegheny River are coded as Major Rivers. All other
River and Stream polygons are coded as River. If a stream is less than 25 feet
wide it is placed as a single line and coded as a Stream.<span style='mso-spacerun:yes'>  </span>Both sides of the stream are digitized and
coded as a Stream for Streams whose width is greater than 25 feet.<span style='mso-spacerun:yes'>  </span>River edges are digitized and coded as River.
A Drainage Canal is a manmade or channelized hydrographic feature.<span style='mso-spacerun:yes'>  </span>Drainage Canals are differentiated from
streams in that drainage canals have had the sides and/or bottom stabilized to
prevent erosion for the predominant length of the feature.<span style='mso-spacerun:yes'>  </span>Streams may have had some stabilization done,
but are primarily in a natural state. Lakes are large standing bodies of water
greater than five acres in size.<span style='mso-spacerun:yes'>  </span>Ponds are
large standing bodies of water greater than one acre in size and less than five
acres in size.<span style='mso-spacerun:yes'>  </span>Reservoirs are manmade
embankments of water.<span style='mso-spacerun:yes'>  </span>Included in this
definition are both covered and uncovered water tanks. Reservoirs that are
greater than one acre in size are digitized. Hidden Streams, Hidden Rivers and
Hidden Drainage Canal or Culverts are those areas of drainage where the water
flows through a manmade facility such as a culvert. Hydrology Annotation is not
being updated but will be preserved.<span style='mso-spacerun:yes'>  </span>If
a drainage feature has been removed, as apparent on the aerial photography, the
associated drainage name annotation will be removed. A Mooring Cell is a
structure to which tows can tie off while awaiting lockage.<span style='mso-spacerun:yes'>  </span>They are normally constructed of concrete and
steel and are anchored to the river bottom by means of gravity or sheet piling.
Mooring Cells do not currently exist in the Allegheny County dataset but will
be added. Locks are devices that are used to control flow or access to a
hydrologic feature.<span style='mso-spacerun:yes'>  </span>The edges of the
Lock are captured.<span style='mso-spacerun:yes'>  </span>Dams are devices that
are used to hold or delay the natural flow of water.<span style='mso-spacerun:yes'>  </span>The edges of the Dam are shown.</span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif;
mso-no-proof:yes'></span></p>

<p><span style='font-size:10.0pt;line-height:107%;font-family:
&quot;Tahoma&quot;,sans-serif'>If viewing this description on the Western Pennsylvania
Regional Data Center’s open data portal (</span><a href='http://www.wprdc.org'><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>http://www.wprdc.org</span></a><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>), this
dataset is harvested on a weekly basis from Allegheny County’s GIS data portal
(</span><a href='http://openac.alcogis.opendata.arcgis.com/'><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>http://openac.alcogis.opendata.arcgis.com/</span></a><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>). The
full metadata record for this dataset can also be found on Allegheny County’s
GIS portal. You can access the metadata record and other resources on the GIS
portal by clicking on the “Explore” button (and choosing the “Go to resource”
option) to the right of the “ArcGIS Open Dataset” text below.</span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Category:</span></b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'> <span style='mso-spacerun:yes'> </span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>Environment</span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Organization:</span></b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'> <span style='mso-spacerun:yes'> </span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>Allegheny County</span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Department:</span></b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-spacerun:yes'>  </span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>Geographic Information Systems Group; Department of
Administrative Services</span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Temporal
Coverage:<span style='mso-spacerun:yes'>  </span></span></b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>2006</span></span><b><span style='font-size:10.0pt;line-height:
107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></b></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Data
Notes:<span style='mso-spacerun:yes'>  </span></span></b></p>

<p><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>Coordinate System:<span style='mso-spacerun:yes'> 
</span>Pennsylvania State Plane South Zone 3702; U.S. Survey Foot</span></span></p>

<p><span style='font-size:10.0pt;line-height:107%;font-family:
&quot;Tahoma&quot;,sans-serif;mso-no-proof:yes'>Development Notes:<span style='mso-spacerun:yes'>  </span>Original Lakes and Drainage datasets combined
to create this layer. Data was updated as a result of a flyover in the spring
of 2004. A database field has been defined for all map features named
&quot;Update Year&quot;. This database field will define which dataset provided
each map feature. Map features from the current map will be set to
&quot;2004&quot;. The earlier dataset map features the earlier dataset map features
used to supplement the area near the county boundary will be set to
&quot;1993&quot;. All new or modified map data will have the value for
&quot;Update Year&quot; set to &quot;2004&quot;.<span style='mso-spacerun:yes'>  </span></span></p>

<p><span style='font-size:10.0pt;line-height:107%;font-family:
&quot;Tahoma&quot;,sans-serif;mso-no-proof:yes'>Other: none</span><b><span style='font-size:10.0pt;line-height:
107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></b></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Related
Document(s):</span></b><span style='font-size:10.0pt;line-height:107%;
font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-spacerun:yes'>  </span>Data
Dictionary (</span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>https://docs.google.com/spreadsheets/d/16BWrRkoPtq2ANRkrbG7CrfQk2dUsWRiaS2Ee1mTn7l0/edit?usp=sharing</span></span><span style='font-size:
10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>)</span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Frequency
- Data Change:</span></b><span style='font-size:10.0pt;line-height:107%;
font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-spacerun:yes'>  </span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>As needed</span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Frequency
- Publishing:</span></b><span style='font-size:10.0pt;line-height:107%;
font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-spacerun:yes'>  </span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>As needed</span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Data
Steward Name:</span></b><span style='font-size:10.0pt;line-height:107%;
font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-spacerun:yes'>  </span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>Eli Thomas</span></span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></p>

<p><b><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'>Data
Steward Email:</span></b><span style='font-size:10.0pt;line-height:107%;
font-family:&quot;Tahoma&quot;,sans-serif'> </span><span style='font-size:10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'><span style='mso-no-proof:yes'>gishelp@alleghenycounty.us</span></span><span style='font-size:
10.0pt;line-height:107%;font-family:&quot;Tahoma&quot;,sans-serif'></span></p>

Tags: _etl, environment, inland-waters, lake, river, stream, water, western-pennsylvania
Organization: Allegheny County / City of Pittsburgh / Western PA Regional Data Center