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Watershed Tools For Massachusetts. Pete Steeves USGS WRD MA-RI District. A Cooperative Environment. MassGIS development of centerline data (24k) creation of the ARCVIEW interface and initial set of tools AVENUE expertise USGS WRD -- MA/RI District

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Watershed tools for massachusetts

Watershed Tools For Massachusetts

Pete Steeves

USGS WRD MA-RI District


A cooperative environment
A Cooperative Environment

  • MassGIS

    • development of centerline data (24k)

    • creation of the ARCVIEW interface and initial set of tools

    • AVENUE expertise

  • USGS WRD -- MA/RI District

    • initial watershed delineation programs in ARC

    • compilation of DEM/GRID data and drainage enforcement programs

    • working with MassGIS to enhance the watershed tools with new and improved features based on project applications


Goals for the development of gis watershed analysis tools
Goals for the Development of GIS Watershed Analysis Tools

  • Quick and reliable method for delineating basins from any point on any river in the State

  • Broad and flexible in its applicability to hydrologic investigations

  • Demonstrate its use through pilot applications that address management concerns


Datalayer pre requisites
Datalayer Pre-requisites

  • Networked centerline of USGS DLG hydrography with a system of reach codes attached

  • Sub-basin boundaries within a watershed that will help to minimize the dependence on DEM based basin delineation and speed up subsequent analysis

  • Drainage enforced DEM/Grid data


Working environment arcview
Working Environment: ARCVIEW

  • Perform actions on the network such as ‘upstream trace’ and ‘find all downstream events’

  • Delineate a basin from a selected point on the network

  • Batch delineate basins using an event table

  • Make linear events from point events to establish a population of segments





Delineate a watershed
...Delineate a Watershed



Drainage enforcement steps for 24k dems
Drainage Enforcement Steps For 24K DEMs

  • Merge DEM derived grids and ‘clip’ to a 4000 foot buffer around selected watershed

  • ‘VIP’ 70% of the cells into a point coverage

  • Run ‘Topogrid’

    • resample cell size to 10 meters

    • input would include vector centerline and VIP elev points

    • watershed may have to be broken up and pieced back

  • Run ‘agree.aml’ from University of Texas

    • exaggerate the depths of the streams by canyonizing them

    • enhances the topogrid processing

    • minimize smooth distance tolerance

  • Run ‘fill’ on the output, followed by ‘flowdirection’ and ‘flowaccumulation’


Watershed tools for massachusetts

Application I

  • Obtaining streamflow statistics for Massachusetts streams on the WEB

    • User chooses any point on any stream

    • The watershed is delineated

    • The application calculates variables(area of stratified drift, total length of streams, mean elevation and slope values) from which stream flow statistics are calculated, including:

  • Peak-flow frequencies - mean annual, 10-, 25-, 50-, 100-, and 500-year floods

  • Low-flow frequencies - 7-day, 2- and 10-year low flows

  • Flow durations - 99 through 1 % exceedance probabilities

  • August median flow


The stream statistics web page http ma water usgs gov streamstats
THE STREAM STATISTICS WEB PAGEhttp://ma.water.usgs.gov/streamstats/







Application ii
Application II

  • Characterize water resources (streams, lakes/ponds) on a river network (Neponset River Basin) for water-quality monitoring:

    • Define a population of stream segments

    • Determine physical characteristics of stream segments (length, stream order)

    • Classify stream segments in terms of watershed characteristics that might affect water quality (i.e. - land use)


Watershed tools for massachusetts

Stream Segments are Defined Based on Locations Where a Change in Water-Quality May Occur:

Tributary confluences

Significant lakes (> 5 acres)

Significant point-source discharges (NPDES sites)


Watershed tools for massachusetts

Resulting Segmentation in a Section of the Network Change in Water-Quality May Occur:


Physical characteristics of streams neponset river basin
Physical Characteristics of Streams Change in Water-Quality May Occur:Neponset River Basin

Total:

312 stream segments152 stream miles

45 significant lakes(not shown)

Stream Order


Determining watershed characteristics requires delineating watersheds
Determining Watershed Characteristics Requires Change in Water-Quality May Occur:Delineating Watersheds

Batch Delineation


Development of watershed tools in the nhd arcview toolkit
Development of Watershed Tools in the NHD ArcView Toolkit Change in Water-Quality May Occur:

  • Currently working on adding watershed delineation functionality to the Toolkit

  • Focusing on areas where 1:24,000 scale National datalayers are available

  • Testing the validity of using 1:100,000 scale NHD

  • Plans to incorporate other tools into the Toolkit (event creation and search, a raindrop tool, batch delineation of watersheds…)


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