Parent Layer: Stormwater

Name: Pipe Grade Capacity Assessment

Display Field: UNIQUE_ID

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: Pipe Capacity was determined using basic pipe segment geometry data (shape, size, material type) where available. Pipe length was derived from GIS. Pipes with missing or invalid physical data for material, length, etc. were not analyzed. Pipes with missing of invalid qualitative data (i.e.: unrealistic pipe capacity values during the calculation steps) were reassigned to the worst case scenario within an acceptable range. Upstream and downstream elevation was determined from surface terrain provided slope. Manning’s n-value was taken from the iSWM table of values. This information was used to calculate Area, Wetted Perimeter, and Hydraulic Radius and the Manning’s Equation used to calculate Pipe Capacity (cfs). For cases that might indicate multiple barrels or parallel pipes, a coefficient was assigned by hand based on review of available data such as plans, maps, or Google Streetview. The coefficient represents the portion of the flow taken by each pipe. For example, if there are parallel 10” pipes, then each gets coefficient 0.5 while if there is a 12” and an 8” then they are assigned 0.6 and 0.4, respectively. The flow accumulation grid provided the contributing upstream drainage area. The flow accumulation grid was developed by Halff for the city from a variety of sources of “best available data” (terrain data). Pipe Capacity (cfs) / Drainage Area (acres) yields Inches/hourPipe capacity for a given area (Drainage Area) provides a pipe description in terms of inches per hour, which relates directly to rainfall intensities. In GIS, a bisect function is used to rank the results for each pipe segment into the following breakpoints:Grade F, 1.36 in/hr, 1 year return periodGrade D, 2.19 in/hr, 1-5 year return periodGrade C, 3.02 in/hr, 5-25 year return periodGrade B, 3.4 in/hr, 25-50 year return periodGrade A, 10.0 in/hr, beyond a 50 year return period- 10.0 inches is used to capture the upper bound of values in the results data.The bisect function, in this case, utilized breakpoints selected based on values of intensity from the Tarrant County Rainfall Data from iSWM for the 1-hour storm. The Letter Grade are based on a notion that a storm drain system that corresponds to the 1-year event is Poor, one that just conveys the 5-year may be adequate but is likely to result in flooding. Anything that conveys beyond 3 inches/hour is likely sufficient and may not merit further investigation, study or consideration for capital projects. The basis for this is from the Feasible Options Study conducted by Michael Baker Jr. lead by Burton Johnson. See Feasible Options Study Digest for further discussion.

Copyright Text: Brown & Gay Engineers and the City of Fort Worth.

Default Visibility: true

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 24000.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 2267095.306730807
YMin: 6886783.093891144
XMax: 2418954.8881816417
YMax: 7066238.964965567
Spatial Reference: 102738  (2276)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: Pipe_Rank_Alpha
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: A
  Label: A
  Description: N/A
  Symbol:
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  Width: 2
• Value: B
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• Value: C
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Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• UNIQUE_ID ( type: esriFieldTypeString, alias: UNIQUE_ID, length: 30 )
• OWNER ( type: esriFieldTypeString, alias: OWNER, length: 30 , Coded Values: [Private: Private] , [City: City] , [Public Other: Public Other] , ...4 more... )
• TYPE ( type: esriFieldTypeString, alias: TYPE, length: 30 , Coded Values: [Gravity Main: Gravity Main] , [Lateral: Lateral] , [Culvert: Culvert] , ...5 more... )
• PIPE_SHAPE ( type: esriFieldTypeString, alias: PIPE_SHAPE, length: 30 , Coded Values: [Arch: Arch] , [Box: Box] , [Elliptical: Elliptical] , ...3 more... )
• MATERIAL ( type: esriFieldTypeString, alias: MATERIAL, length: 30 , Coded Values: [Cast Iron: Cast Iron] , [Concrete: Concrete] , [Corrugated Iron: Corrugated Iron] , ...14 more... )
• LENGTH_FT ( type: esriFieldTypeDouble, alias: LENGTH_FT )
• HEIGHT_FT ( type: esriFieldTypeDouble, alias: HEIGHT_FT )
• WIDTH_FT ( type: esriFieldTypeDouble, alias: WIDTH_FT )
• DIAM_IN ( type: esriFieldTypeSmallInteger, alias: DIAM_IN )
• SLOPE ( type: esriFieldTypeDouble, alias: SLOPE )
• US_ELEV_PLAN ( type: esriFieldTypeDouble, alias: US_ELEV_PLAN , Range: [390, 1110] )
• DS_ELEV_PLAN ( type: esriFieldTypeDouble, alias: DS_ELEV_PLAN , Range: [390, 1110] )
• US_ELEV_FIELD ( type: esriFieldTypeDouble, alias: US_ELEV_FIELD , Range: [390, 1110] )
• DS_ELEV_FIELD ( type: esriFieldTypeDouble, alias: DS_ELEV_FIELD , Range: [390, 1110] )
• LIFE_CYCLE ( type: esriFieldTypeString, alias: LIFE_CYCLE, length: 30 , Coded Values: [Active: Active] , [Abandoned: Abandoned] , [Not found in field: Not found in field] , ...7 more... )
• CRITICAL_RATING ( type: esriFieldTypeSmallInteger, alias: CRITICAL_RATING )
• COMMENT ( type: esriFieldTypeString, alias: COMMENT, length: 200 )
• TEMP_ID ( type: esriFieldTypeString, alias: TEMP_ID, length: 30 )
• Enabled ( type: esriFieldTypeSmallInteger, alias: Enabled , Coded Values: [0: False] , [1: True] )
• INSTALL_DATE ( type: esriFieldTypeDate, alias: INSTALL_DATE, length: 8 )
• ASSET_LENGTH ( type: esriFieldTypeDouble, alias: ASSET_LENGTH )
• ACCELA_STATUS ( type: esriFieldTypeString, alias: ACCELA_STATUS, length: 30 )
• Grade_Coefficient ( type: esriFieldTypeDouble, alias: Pipe_Grade_Coefficient )
• Grade_Comment ( type: esriFieldTypeString, alias: Grade Comment, length: 250 )
• Original_Grade ( type: esriFieldTypeString, alias: Original_Grade, length: 5 )
• MAX_ ( type: esriFieldTypeInteger, alias: MAX )
• US_LIDAR_Z ( type: esriFieldTypeDouble, alias: US_LIDAR_Z )
• DS_LIDAR_Z ( type: esriFieldTypeDouble, alias: DS_LIDAR_Z )
• Man_RoughN ( type: esriFieldTypeDouble, alias: Man_RoughN )
• P_Area_SF ( type: esriFieldTypeDouble, alias: P_Area_SF )
• P_Perim_Ft ( type: esriFieldTypeDouble, alias: P_Perim_Ft )
• P_HydRad ( type: esriFieldTypeDouble, alias: P_HydRad )
• P_SlopePct ( type: esriFieldTypeDouble, alias: P_SlopePct )
• P_Vel_FPS ( type: esriFieldTypeDouble, alias: P_Vel_FPS )
• P_Qcap_CFS ( type: esriFieldTypeDouble, alias: P_Qcap_CFS )
• FA_DrainAr_Ac ( type: esriFieldTypeDouble, alias: FA_DrainAr_Ac )
• DrainAr_wC ( type: esriFieldTypeDouble, alias: DrainAr_wC )
• US_DA ( type: esriFieldTypeDouble, alias: US_DA )
• DA_keep ( type: esriFieldTypeDouble, alias: DA_keep )
• DA_Error ( type: esriFieldTypeInteger, alias: DA_Error )
• Qcap_IN_RO ( type: esriFieldTypeDouble, alias: Qcap_IN_RO )
• Pipe_Rank_Numeric ( type: esriFieldTypeDouble, alias: Pipe_Rank_Numeric )
• Pipe_Rank_Alpha ( type: esriFieldTypeString, alias: Pipe_Rank_Alpha, length: 2 )
• Pipe_ROTimesDrainArea ( type: esriFieldTypeDouble, alias: Pipe_ROTimesDrainArea )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Shape.STLength() ( type: esriFieldTypeDouble, alias: Shape.STLength() )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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