GISHydro@Maryland


A Collaboration between the Department of Civil and Environmental Engineering and the Maryland State Highway Administration, Office of Structures (OOS)
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MD Hydrology Panel

Updates Page

As individuals and organizations test and "break" the program, we are continuously making corrections and changes. Please note that the date of the installation program changes frequently. To document and archive the changes, a chronological list of changes is provided below:

 

Date

Update Description

Full Install Required?

1/8/2011

Web served updated to include Maryland Department of Planning 2010 land use

False

1/1/2011

Web server updated to reflect Thomas (2010) regression equations when choosing "Thomas Discharges" under "Hydro" menu.

False

5/5/2010

SSURGO soils data for New Castle (DE) county added to web server.

False

3/15/2010

Modified Control Panel to offer DelMarVa unit hydrograph option.

False

5/20/2009

SSURGO soils data for Allegany (MD), Preston (WV), and Tucker (WV) counties added to web server.

False

9/22/2008

Added Stream Biodiversity Extension written by Dr. Yin-Phan Tsang. This ArcView extension plugs into GISHydro directly.

False

9/15/2008

Added feature to Maryland web-version that allows for constrained watershed delineation.

False

5/20/2008

SSURGO soils data for Prince George's county added to web server.

False

11/30/2007

Added Tributary Strategy loading tables to CBPO tool. Fixed small bug with 25-year design storm creation.

False

10/27/2007

Revised design storm tool now creates watershed-specific design storms consistent with NOAA Atlas 14 data set (re-download Precipitation Installer). Added SSURGO Soils in: Calvert, Garrett, Harford, St. Marys, Kent (Delaware), Delaware (Pennsylvania).

True

5/29/2007

Added Delaware Peak Flow calculations to Hydro menu, Delaware Ultimate Land Use, and Septic Tool to CBPO nutrient loading menu.

True

4/19/2007

Made modest changes to APR file to add vertical scrollbar to Hydrologic Condition Modifier tool and to remove a generated schematic.

False

4/7/2007

Institutionalized tools for EPA Chesapeake Bay Program interpolator. Tools required certain data sets which are part of this complete installation.

True

2/14/2007

Added new tools to EPA Chesapeake Bay Program interpolator. Tools allow user to define BMPs through a customized dialog or through the importation of a BMP dbase file.

False

1/22/2007

Fixed significant bug in cross-section editor. Program was mixing English/Metric units when calculating and reporting cross-sections characteristics and rating curves.

False

1/15/2007

Added new tools to EPA Chesapeake Bay Program interpolator. Tools aid analysis file creation, calculate future loading for any CBPO Phase 4 land use, and include more extensive reporting for future conditions.

False

1/8/2007

Added menu and tools that allow for interpolation of EPA Chesapeake Bay Program Phase 4 loads anywhere in Maryland. Fixed small attribute table bugs in USGS gage data.

True

9/18/2006

Slight modification to gishydrometric.apr file to fix bug in velocity method default precipitation value.

False

9/5/2006

Added 1-year precipitation data for 6-, 12-, 24-, and 48-hour events. Added DEMs, land use, and STATSGO soils to completely cover Delaware. Added SSURGO soils for Sussex County, DE. Some modest bug changes also performed.

True

7/18/2006

Slightly revised .apr file when generating schematic, stream length tolerance reduced by a factor of 3 to reflect lingering English to Metric conversion issue. Rare error message should now be even more rare.

False

6/23/2006

Revised DNR-PLOAD program - there was a bug in the calculation of impervious area if nutrient loading code was executed multiple times.

False

6/7/2006

Added 48-hour rainfall for 2- through 500-year events to precipitation database. You need to download: 1) Precipitation database install; 2) gishydrometric.apr; 3) umdgishydrometric.avx.

False

5/6/2006

Revised ultimate land use files to include zoning in Delaware for areas draining to the Choptank River.

True

3/30/2006

3 new items: 1) Gage weighting is now fully implemented for watersheds crossing physiographic provinces; 2) STATSGO soil distributions are used for regression equations; 3) Warnings are printed for watersheds near province breaks and limestone geology.

True

3/20/2006

This full installation contains the latest changes of March 4th and 13th plus a slightly modified data file for the "Tasker" program and the Fixed Region equations.

True

3/13/2006

Small changes to the file: umdgishydrometric.avx file to account for changes in standard error estimates in Carpenter, Dillow, L-Moment, and Region of Influence methods for peak discharge estimation. Users only need to download/re-install this file.

False

3/4/2006

Small bug fixed: If soil type is undefined it is now treated as a "D" soil. This guarantees that area calculations in basin composition and sub-area statistics output sum to 100 percent.

False

1/9/2006

Added Delaware 2002 land use to create composite MD/DE 2002 land use dataset. Fixed two bugs: 1) channel burning now 500 feet so filling doesn't undermine true channel locations, 2) limestone percent calculation revised for when STATSGO soils are chosen.

True

12/14/2005

Small change to .apr file. Program had trouble calculating flow directions if elevations were less than zero. Just download and re-install new .apr file.

False

12/10/2005

Several Changes: Fixed "Tasker program" bug for Eastern Shore, Revised Howard County ultimate development, slight change to "Paul program" to calculate O/E ratio.

True

11/23/2005

Added data and codes to do water quality modeling - See new "DNR-Water Quality" menu. Program calculates annual loadings using PLOAD method and calculates reference stream biodiversity.

True

9/27/2005

Modified Select Quads dialog to input working directory. Fixed bug with Modify Hydrologic Condition dialog resulting from web-based version.

False

8/29/2005

Added Caroline and Wicomico counties "Draft SSURGO" soils data. Small modification to mandate storm selection in TR-20 Control Panel. Small changes related to web-based file handling.

True

8/12/2005

Some changes to both the .apr and .avx files related to development of web-based version of GISHydro. Program now writes all files to "c:\temp\xxxxx" directory. Also fixed bug with "Discharge Comparison" menu choice.

False

7/14/2005

Added Baltimore, Cecil, Charles, and Talbot Counties "Draft SSURGO" soils data.

True

6/27/2005

Fixed bug in Dimensionless Hydrograph code under "Hydro: Calculate Hydrograph" to work correctly with Appalachian province watersheds.

False

5/24/2005

Added Howard and Kent county SSURGO soils data. Added Somerset "Draft SSURGO" soils data.

True

5/17/2005

Added external executable that runs the "Gary Tasker" program to establish confidence intervals on Fixed Region equations and make adjustments for USGS gage data. Several small bugs also fixed.

True

2/6/2005

Added 2002 Land Use from Maryland Department of Planning. Added Tc Velocity method segment generator dialog. Documentation for this dialog is available at documentation web page.

True

9/18/2004

Revised .apr and .avx files slightly so user can specify any subset of storm frequencies and/or durations from the 24 available storms. See "Precipitation Depths" menu choice under "TR-20 Interface" Menu. Added "Analysis Date:" stamps to text outputs.

False

9/15/2004

Major Revision: The new .apr and .avx files now allow for automatic determination of precipitation depths for 2- through 500-year storms for 6, 12, and 24 hour durations. You MUST also download the separate Precipitation Installation download program.

True

9/8/2004

Revised umdgishydrometric.avx file to remove bug in limestone area calculation when multiple physiographic provinces are present.

False

6/24/2004

Revised Digital Raster Graphics (DRG) reference shapefile for correct behavior in southernmost Maryland quads.

True

6/21/2004

Revised APR to remove bug in "Calculate Attributes" menu choice.

False

6/15/2004

Revised APR to remove bug in "Merge Selected Subwatersheds" menu choice.

False

6/10/2004

Revised ultimate land use dataset.

True

5/14/2004

Revised 30m_DEMs dataset. The GISHydroMetric.apr file was revised slightly as well.

True

5/10/2004

Revised Fixed Region (Thomas Discharges) Equations for Blue Ridge Region.

False

5/6/2004

Slightly updated .apr and .avx files. Land use modification tool now takes unlimited number of polygons that can be digitized at one time for a single new user specified land use.

False

4/30/2004

Revised GISHydro2000 with all spatial data in Maryland Stateplane coordinate system in horizontal units of meters.

True

2/27/2004

Added Dialog to modify hydrologic condition by land use category. "Poor" hydrologic condition now supported. SSURGO soils for Anne Arundel County added.

True

1/30/2004

Modified Cross-Section editor to default to US Fish and Wildlife Service hydraulic geometry equations based on Maryland Stream Survey

False

1/15/2004

Fixed small "bug" in velocity method code. Velocity method temporary files now delete on completion of calculations.

False

1/9/2004

Revised APR to produce more extensive reporting of velocity method time of concentration calculation. Revised 2 year, 24 hour precipitation depth per new NWS study.

True

12/15/2003

Revised AVX file to produce Hydrology Panel approved regression equations for all regions. These equations are accessed through "Hydro: Calculate Thomas Discharges"

False

8/4/2003

Revised APR file to produce correctly vectorized versions of any grid using "C" button on interface.

False

7/31/2003

Revised AVX file to produce standard error estimates consistent with USGS methods. Also included are small changes to significant figures formatting of discharges and curve number values.

False

7/17/2003

Revised Ultimate Development land use to reflect new zoning data in Prince Georges County

True

7/15/2003

Fixed "bug" in Fixed Region, Q100 calculation for Piedmont region. Only umdgishydro.avx needs to be replaced in installation.

False

7/2/2003

Revised APR and AVX files to fix bug in land use category reporting with ultimate land use. Output text files now show apr, and avx release date for documentation purposes.

False

6/20/2003

Revised peak flow estimation methods: Fixed Region, Region of Influence, and L-Moment. Updated limestone and mdprov shapefiles.

True

4/10/2003

Fixed several "bugs" in land use modification dialog

False

4/3/2003

Add land use modification dialogue that can be accessed from the "LU" button when in the "Area of Interest" view. This dialogue allows for the modification of land use, imperviousness, and curve numbers associated with user digitized polygons.

True

10/24/2002

Added 2000 Land Use, Updated Ultimate Land Use, Revised Region Of Influence Method

True

8/13/2002

Updated Hydro Extension to Create Table of Peak Discharge Estimates Using Three new Alternative Methods to Existing USGS Equations

True

3/20/2002

Added Ultimate Land Use Coverage for entire State of Maryland, Added SSURGO Data in Frederick County, MD and several Pennsylvania Counties, Added Velocity Method Tc Calculator, Full Documentation available by following Documentation Link

True

4/18/2001

Added Washington D.C. SSURGO Data and added numerous features

True

10/19/2000

Fixed TR-20 Control Panel error for single (homogeneous) wantershed.

False

10/18/2000

"Where is Limestone.vat?" error corrected.

False

10/17/2000

DRG coverage added for Reston and Chincoteague 1:250k maps.

False

10/16/2000

Part of Urbanna Quad ('85,'90 Ragan LU) missing. Corrected.

False

10/16/2000

Aberdeen ('85 Ragan Landuse) corrected to proper projection.

False

10/16/2000

All zip files corrected for "saint_clements_islan" to "saint_clements_island". Quads83 theme updated

True

8/10/2000

GISHydro2000 Second Edition available for download.

True

6/15/2000

GISHydro2000 Second Edition nearing completion. New Cross Section editor, data and tools included.

False

3/28/2000

Added the complete coverage of 1:250k DRGs. Previously had only the Baltimore and Washington maps. Current coverage is clipped to quads83 boundary and spans 5 files.

True

2/21/2000

Fixed Wittenberg quad naming in the database. L70s zip file updated. Other files updated previously. (no more whittenberg or whitesberg).

True

2/9/2000

Added 1970 USGS Land use for WV quads. Updated USGS and Andersen land use lookup tables.

False

2/8/2000

Added MRLC land use, STATSGO soils, and MD provinces for WV quads.

True

2/7/2000

Added four West Virginia quads to database: Brandonville, Cuzzart, Aurora, Terra Alta, and Lead Mine. Added quads to Quads83v3 theme. Updated 30m_dems.zip (DEMs from USGS GeoData, SDTS format).

True

2/1/2000

Modified installation program to overwrite with newer file versions. Shortcut Icon now added to Desktop for APR file.

False