Inundation from Sea Level Rise

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Delaware Coastal Programs

Publication_Date: 20100201

Title: Inundation from Sea Level Rise

Description:

Abstract:

Estimated inundation from various Sea Level Rise scenarios for watersheds in Delaware. This is a very simplified approach to modeling inundation consisting of filling the watershed to constant depths (i.e. "Bath Tub" modelling). Disclaimer These maps are a representation of inundation based on local Mean Higher High Water (MHHW). Inundation is assumed to occur at a constant elevation (Bathtub Model) and no other factors other than tidal elevation are used to determine water levels. The land surface elevations are based on data with an average accuracy of 15 cm (6 inches), however areas of heavy vegetation may have errors exceeding that amount. The Delaware Coastal Programs makes no warranty and promotes no other use of these maps other than as a preliminary planning tool.

Purpose:

To provide initial estimates of areas to be impacted by inundation due to Sea Level rise. It is expected that this data will be superceeded as better information becomes available.

Time_Period_of_Content:

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Keywords:

Theme:

Theme_Keyword_Thesaurus: ArcIMS Metadata Service Themes

Theme_Keyword: climatologyMeteorologyAtmoshpere

Theme_Keyword: elevation

Theme_Keyword: environment

Theme:

Theme_Keyword: sea level rise

Theme_Keyword: inundation

Theme_Keyword: coastal flooding

Place:

Place_Keyword: USA

Place_Keyword: Delaware

Place_Keyword: New Castle

Place_Keyword: Kent

Place_Keyword: Sussex

Use_Constraints:

These maps are a representation of inundation based on local Mean Higher High Water (MHHW). Inundation is assumed to occur at a constant elevation (Bathtub Model) and no other factors other than tidal elevation are used to determine water levels. The land surface elevations are based on data with an average accuracy of 15 cm (6 inches), however areas of heavy vegetation may have errors exceeding that amount. The Delaware Coastal Programs makes no warranty and promotes no other use of these maps other than as a preliminary planning tool.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Delaware Coastal Programs

Contact_Person: Dr. Robert Scarborough

Contact_Position: DNERR Research Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 89 Kings Hwy

City: Dover

State_or_Province: DE

Postal_Code: 19901

Country: USA

Contact_Voice_Telephone: (302) 739-9283

Contact_Facsimile_Telephone: (302) 739-2048

Contact_Electronic_Mail_Address: bob.scarborough@state.de.us

Hours_of_Service: M - F 0800-1600

Security_Information:

Security_Classification: Unclassified

Data_Quality_Information:

Logical_Consistency_Report:

Extents of inundation checked against the road and bridge network and the elevations of coastal impoundments. See Methods document for a description of how these elements were handled.

Lineage:

Process_Step:

Process_Description:

Procedure for Developing Inundation Maps
* Conversion of Lidar data to usable format o Multiply Lidar data by 100 (3D Analyst Tools/Raster Math/Times) o Integer Lidar data (3D Analyst Tools/Raster Math/Int) o Note: Lidar data is now in centimeters instead of meters
* Extract Lidar data for target watershed o Extend target watershed boundaries into receiving water body o Select target watershed o Extract Lidar data for target watershed (Spatial Analyst Tools/Extraction/Extract by Mask)
* Determine MHHW and target elevations for Watershed o Using NOAA software VDatum determine MHHW for watershed in NAVD88 o Determine all target elevations in NAVD88
* Reclassify Watershed Lidar DEM o Reclassify elevation data into number of target elevations plus 1. Example: Lowest number in data to MHHW = 0, MHHW+1 to first target number = 2, last target number +1 to highest number in data = NoData. (Spatial Analyst/Reclass/Reclassify)
* Convert Data to Polygons o Open Attribute table and select lowest elevation desired plus all elevations less than desired elevation. o Convert to polygon; do not select simplify polygons option (Conversion Tools/From Raster/Raster to Polygon) o Simplify polygon to user requirements, used Bend Simplify algorithm, 10 meter offset, 500 square m minimum area (Data Management Tools/Simplify Polygon) o Repeat for all elevations o Remove created point files and other intermediary files
* Create County Based layers o Split Watersheds overlapping Counties ? Smyrna and Mispillion Watersheds divided along county border. Using Kent County polygon. Clip (watershed portions inside Kent County) or Erase (watershed portions outside Kent County) Smyrna and Mispillion Watersheds (Analysis Tools/Extract/Clip or Analysis/Tools/Overlay/Erase)
o Combine all county watersheds/split watersheds into one layer (Analysis Tools/Overlay/Union) o Merge and clean borders ? Select all adjoining polygons and merge into contiguous polygon (Editor) ? Fill and/or cut adjoining watershed boundaries, where necessary, to create seamless merges (Editor). Note: These errors occurred from joining simplified polygons.

Process_Date: 201002

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Delaware Coastal Programs

Contact_Person: Dr. Robert Scarborough

Contact_Position: DNERR Research Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 89 Kings Hwy

City: Dover

State_or_Province: DE

Postal_Code: 19901

Country: USA

Contact_Voice_Telephone: (302) 739-9283

Contact_Facsimile_Telephone: (302) 739-2048

Contact_Electronic_Mail_Address: bob.scarborough@state.de.us

Hours_of_Service: M - F 0800-1600

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Distance_Units: meters

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Delaware Coastal Programs - Special Projects

Contact_Person: Carl Yetter

Contact_Position: Env. Engineer III

Contact_Address:

Address_Type: mailing address

Address: 89 Kings Hwy

City: Dover

State_or_Province: DE

Postal_Code: 19901

Country: USA

Contact_Voice_Telephone: (302) 739-9283

Contact_Facsimile_Telephone: (302) 739-2048

Contact_Electronic_Mail_Address: carl.yetter@state.de.us

Hours_of_Service: M-F 0800-1600

Metadata_Reference_Information:

Metadata_Date: 20100224

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Delaware Coastal Programs - Special Projects

Contact_Person: Carl Yetter

Contact_Position: Env. Engineer III

Contact_Address:

Address_Type: mailing address

Address: 89 Kings Hwy

City: Dover

State_or_Province: DE

Postal_Code: 19901

Country: USA

Contact_Voice_Telephone: (302) 739-9283

Contact_Facsimile_Telephone: (302) 739-2048

Contact_Electronic_Mail_Address: carl.yetter@state.de.us

Hours_of_Service: M-F 0800-1600