Name: 100 Year Hydrulic Model

Display Field: DRAINAGE_BASIN

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This model layer represents the combined local Engineering Firms drainage studies for each drainage basin displaying the 100 Year Flood Limits by polygon boundaries. This model layer defines the areas that will be subject to development restrictions referenced in the 2018 Field Drainage Prevention Ordinance.This layer is to provide assistance in identifying specific local areas of problematic drainage resulting from a 100 Year 24 hour storm event.This model layer represents the local hydraulic study (ZONE 'M') of each drainage basin within the City of Savannah. The results of the detail drainage studies take into acount not only the surface runoff calculations, but also the pipe sizes and flow direction of existing underground stormwater conduits including recent CIP Drainage Basin improvement projects that may not have been incorporated into the National DFIRM Flood maps.CITY ZONE 'M' - means an area defined through hydraulic modeling or other standard engineering analysis as described in Article B, Section 8-70 of the Stormwater Field Drainage Prevention Ordinance.A calibrated hydrologic / hydraulic study of each of the drainage basin was performed using the Stormwater program XPSWMM and historic local flooding data to produce each of the 100 Year Flood Plain Limit boundaries.THIS LAYER IS EDITED AS NEEDED WHEN NEW BASIN MODELS BECOME AVAILABLE.AVAILABLE FOR DOWNLOAD ON THE SAGIS OPEN DATA WEBSITE (www.sagis.org).

Service Item Id: b876840aa5be460f9b20f4f9f3a57cb0

Copyright Text: BILBO BASIN STUDY - PUBLISHED SEPT. 2013 - HUSSEY, GAY, BELL & DeYOUNG ENGINEERING SERVICES CASEY NORTH BASIN STUDY - PUBLISHED SEPTEMBER, 2013 - HUSSEY, GAY, BELL & DeYOUNG ENGINEERING SERVICES CASEY SOUTH BASIN STUDY - PUBLISHED JULY, 2011 - EMC ENGINEERING SERVICES PLACENTIA BASIN STUDY - PUBLISHED MAY, 2018 - EMC ENGINEERING SERVICES SPRINGFIELD CANAL BASIN STUDY - PUBLISHED DECEMBER, 2017 - THOMAS & HUTTON ENGINEERING SERVICES OWNER: CITY OF SAVANNAH - STORMWATER DEPT. ROGER RAINES - STORMWATER DEPT. DIRECTOR - (PH. 650-7855) rraines@savannahga.gov TOM McDONALD, CFM - PERMITTING / FLOODPLAIN ADMINISTRATOR - (PH. 912-651-6530 ext 1895) tmcdonald@SavannahGa.Gov ZACK HOFFMAN - STORMWATER DEPT. ENGINEERING CIP ADMINISTRATOR (PH. 644-7762) zhoffman@savannahga.gov BARRIE WILKINS - ARCGIS EDITOR FOR THIS LAYER (PH. 650-7855) bwilkins@savannahga.gov

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MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

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Max Scale: 0

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Supports Datum Transformation: true

Extent:

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YMin: 723625.2964903191
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Spatial Reference: 102666  (2239)

Drawing Info:

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Labeling Info:

Advanced Query Capabilities:

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HasZ: false

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Has Attachments: false

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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• DRAINAGE_BASIN ( type: esriFieldTypeString, alias: DRAINAGE BASIN, length: 20 )
• VERTICAL_DATUM ( type: esriFieldTypeString, alias: VERTICAL_DATUM, length: 18 )
• ENGINEERING_SOURCE ( type: esriFieldTypeString, alias: ENGINEERING_SOURCE, length: 40 )
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• SHAPE.STLength() ( type: esriFieldTypeDouble, alias: SHAPE.STLength() )

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

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