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Overlays/Watersheds (MapServer)

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Service Description: The term watershed is often applied to geographical areas of different sizes and scales. In general, the definition of a watershed is a geographic area in which water, sediments, and dissolved materials drain from higher elevations to a common low-lying outlet or basin discharging at a point on a larger stream, lake, underlying aquifer, or estuary. The largest watershed management unit is called a basin, which is a large drainage area related to a lake, river, or estuary, such as the Chesapeake Bay. Within each basin is a group of subbasins that can extend over hundreds of square miles. Maryland contains 13 subbasins, ten of which fall within the Chesapeake Bay basin and correspond to ten tributary basins often referred to as Maryland’s “6-digit” watersheds as defined by the Maryland Department of Natural Resources (DNR). Subbasins contain groups of watersheds, which typically range from 20 to 100 square miles in size and are composed of groups of subwatersheds that cover an area of approximately ten square miles or less. Maryland DNR has defined 138 watersheds, which are often referred to as Maryland’s “8-digit” watersheds. They collectively contain the approximately 1,100 subwatersheds referred to as “12-digit” watersheds. Any of these units may be referred to as watersheds, and depending on their size and location, contain a number of land uses including forests, streams, and other natural areas; agricultural and natural resource areas; urban, suburban, and rural communities; roadways and other transportation systems; commercial development and industry; and schools, hospitals, government offices and other public facilities. Water resource issues including water supply, water quality, and habitat for fish and wildlife are closely linked and interdependent with human land uses. How land and water resources are used have impacts on the entire bay watershed.

Map Name: Layers

Legend

All Layers and Tables

Dynamic Legend

Dynamic All Layers

Layers: Description: The term watershed is often applied to geographical areas of different sizes and scales. In general, the definition of a watershed is a geographic area in which water, sediments, and dissolved materials drain from higher elevations to a common low-lying outlet or basin discharging at a point on a larger stream, lake, underlying aquifer, or estuary. The largest watershed management unit is called a basin, which is a large drainage area related to a lake, river, or estuary, such as the Chesapeake Bay. Within each basin is a group of subbasins that can extend over hundreds of square miles. Maryland contains 13 subbasins, ten of which fall within the Chesapeake Bay basin and correspond to ten tributary basins often referred to as Maryland’s “6-digit” watersheds as defined by the Maryland Department of Natural Resources (DNR). Subbasins contain groups of watersheds, which typically range from 20 to 100 square miles in size and are composed of groups of subwatersheds that cover an area of approximately ten square miles or less. Maryland DNR has defined 138 watersheds, which are often referred to as Maryland’s “8-digit” watersheds. They collectively contain the approximately 1,100 subwatersheds referred to as “12-digit” watersheds. Any of these units may be referred to as watersheds, and depending on their size and location, contain a number of land uses including forests, streams, and other natural areas; agricultural and natural resource areas; urban, suburban, and rural communities; roadways and other transportation systems; commercial development and industry; and schools, hospitals, government offices and other public facilities. Water resource issues including water supply, water quality, and habitat for fish and wildlife are closely linked and interdependent with human land uses. How land and water resources are used have impacts on the entire bay watershed.

Service Item Id: 6c68dad0033f4298b72530f51044f07a

Copyright Text:

Spatial Reference: 102685  (2248)


Single Fused Map Cache: false

Initial Extent: Full Extent: Units: esriFeet

Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP

Document Info: Supports Dynamic Layers: true

Resampling: false

MaxRecordCount: 2000

MaxImageHeight: 4096

MaxImageWidth: 4096

Supported Query Formats: JSON, geoJSON, PBF

Supports Query Data Elements: true

Min Scale: 0

Max Scale: 0

Supports Datum Transformation: true



Child Resources:   Info   Dynamic Layer

Supported Operations:   Export Map   Identify   QueryLegends   QueryDomains   Find   Return Updates