Cooperative Hydrology Study (COHYST)
Table of Content
[ Base Coverage ] [ Documentation ] [ General Information] [ Geology ] [ Streambed Hydraulics ]
[ Aquifer Properties ] [ Land Surface Topography ] [ Water Table ] [ River Info ] [ Soils ] [ Land Use ]
[ Weather ] [ Pumpage/Recharge ] [ Groundwater Pumping ] [ Groundwater Recharge ]
[ Aquifer Test Data ] [ Streamflow Gain/Loss ] [ Photo Gallery ] [ Archive ]
Preliminary Data and Reports
Base Coverage
COHYST boundary Download Metadata
Natural Resources District Boundaries Download Metadata
County Boundary Download Metadata
Section Polygons Coverage Download Metadata
Section Corners (SE corner of each section) Download Metadata
Roads Download Metadata
Quadrangle Polygons Coverage Download Metadata
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Documentation
Planning and Strategic Documents

A Total Water Budget Approach to Integrated Management,(Greater Platte River Symposium, October 7, 2010) Powerpoint presentation

Download  

Operation Plan: 2009-2012, Cooperative Hydrology Study Phase III

Download  

Overview of the Objectives, Processes and Products of the COHYST Project

Download  

COHYST II Work Plan and Model Strategy Reports

Download  

COHYST II Scheldule

Download  

Work Plan and Task Completion Reports

Download  
Board of Directors Meeting Minutes

2011 Meeting Minutes

Download  

2010 Meeting Minutes

Download  

2009 Meeting Minutes

Download  

2008 Meeting Minutes

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2007 Meeting Minutes

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2006 Meeting Minutes

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2005 Meeting Minutes

Download  

2004 Meeting Minutes

Download  

2003 Meeting Minutes

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2002 Meeting Minutes

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2001 Meeting Minutes

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2000 Meeting Minutes

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1999 Meeting Minutes

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1998 Meeting Minutes

Download  
40-year, 28% Depletion Lines DNR (Adobe) Download  
PowerPoint Presentation for 40-year, 28% Depletion Lines DNR Download  
Simulated Baseflow Changes from Reducing Irrigated Acres after July 1, 1997

Simulated Baseflow Changes Report(Adobe)

Download  
Estimated Stream Depletion in Nebraska Platte Basin after July 1,1997 New Irrigated Acres

New Stream Depletion by NRD Report-June 2008 (Adobe)

Download  

New Stream Depletion Report-December 5, 2006 (Adobe)

Download  

New Stream Depletion Report(Slide Show)

Download  
Hydrostratigraphic Unit & Aquifer Characterization Report 02/24/2006 Download  
Eastern Model Unit

Groundwater Flow Model Report

Download  

Low Flow Report

Download Support Data
Central Model Unit

Groundwater Flow Model Report

Download  

Low Flow Report

Download Support Data
Western Model Unit

Groundwater Flow Model Report

Download  

Low Flow Report

Download Support Data
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General Information
Naming Convention for COHYST's data Download  
Groundwater Model for COHYST Download  
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Geology
Testhole Database (Access) Values are currently being modified (01/05). Download  
Testhole digital coverage for COHYST area. Values are currently being modified (01/05) Download  
Contour Bottom Layers coverage for COHYST area. (03/2010) Download  
Present Bottom Layers coverage for COHYST area. (03/2010) Download  
Thickness Bottom Layers coverage for COHYST area. (11/2006) Download  
Bedrock-University of Nebraska, Conservation & Survey Division (CSD) Download Metadata
Parent material- A simplification of STATSGO soils based on an index developed by UNL's CSD soil scientists Download  
Soil Classification- Simplification of STATSGO soils for slope and texture. Created by UNL-CSD   Download  
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Streambed Hydraulics
Polygon coverage of river sections examined Download  
Arc coverage defining segments of known slope from "Facts and Figures about Nebraska Rivers" (Bentall, 1991) Download  
Point coverages of graditional trend with the trends being either 'degrading' or 'none' from the 1999 USGS Trend Analysis Report Download  
Point coverage of median bed material size (mm) from 1981 Kircher report, "Interpretation of Sediment Data.." Download  
Streambed coring results. Download Metadata
Streambed Permeameter Download Metadata
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Aquifer Properties
USGS Hydraulic Conductivity Coverage - High Plains Aquifer. Download Metadata
USGS Specific Yield Coverage - High Plains Aquifer Download Metadata
USGS Base of Aquifer Coverage - High Plains Aquifer Download Metadata
USGS Extent of High Plains Aquifer Download Metadata
USGS Geologic Faults - High Plains Aquifer Download Metadata
USGS Areas with Little or No Saturated Thickness - High Plains Aquifer Download Metadata
USGS 1980 Saturated Thickness - High Plains Aquifer Download Metadata
K & SY Database (ACCESS) Modified (01/05) Download  
K & SY Testhole point coverage. Modified (01/05) Download  
Hydrualic Conductivity polygon coverage. Modified (11/06) Download  
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Land Surface Topography
Topographic Regions in Nebraska - from Conservation Survey Division (CSD) 1951 1:1,000,000 scale maps Download Metadata
Nebraska Groundwater Regions Download Metadata
Shaded Relief Map of COHYST Extended Study Area (tif format) Download Metadata
Shaded Relief Map of COHYST Extended Study Area (jpg format) Download Metadata
ET Surface of COHYST Study Area(asciiformat) Download Metadata
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Water Table Information
1995 Water Table Contour from University of Nebraska, Conservation & Survey Division Download Additional Information
1995 Water Table ASCII Grid for COHYST Study Area Download  
Depth to Water Polygon Coverage from University of Nebraska, Conservation & Survey Division Download Metadata
CSD Pre-development Water Table 1979 Download Metadata
USGS Pre-development Water Levels - High Plains Aquifer Download Metadata
USGS Changes in Water Level: Pre-development to 1980 - High Plains Aquifer Download Metadata
USGS Changes in Water Level: 1980-1994 - High Plains Aquifer Download Metadata
USGS Changes in Water Level: 1980-1995 - High Plains Aquifer Download Metadata
USGS Changes in Water Level: 1980-1996 - High Plains Aquifer Download Metadata
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River Information
Streams used in COHYST Model Download Metadata
Surface Water Gaging Sites Download  
Detailed Streams by River Basin Digitized from 7-Minute Quads Download Metadata
Hydrologic Unit Boundaries by River Basin Download Metadata
1:100,000 Scale Lakes Download Metadata
1998 Stream Station Location Download Metadata
1998 US National Climatic Center Streamflow Station Location Database Download  
1982 Missouri Basin States Association

Stream Depletion Factor

Download Tech Paper

Transmissivity

Download Tech Paper
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Soils
State Soil Survey Geographic Data Base (STATSGO) Modified by Dr. Martin UNL Download Metadata
State Soil Survey Geographic Data Base (STATSGO) Download Metadata
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Land Use & Irrigation
COHYST Land Use Mapping 2005 2001 1997 1982 by CALMIT

Land Use Mapping by CALMIT

 
Delineation of landuse patterns in COHYST area using 1997 Thematic Mapper imagery

Project Status by University of Nebraska

 

Final Report by University of Nebraska

 
Evaluation of Historic Landuse - Clint Carney - NPPD Download  
Graphical compilation of Crop Irrigation Data within COHYST - Clint Carney - NPPD Download  
Quick Stats - Nebraska Dept of Agriculture Statistics Download  
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Weather
US National Climatic Center

Temperature

Station Location Coverage

Download Metadata

Current database

Download  

Snowfall

Station Location Coverage

Download Metadata

Current database

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Rainfall

Station Location Coverage

Download Metadata

Current database

Download  

Evaporation

Station Location Coverage

Download Metadata

Current database

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Nebraska Climate Divisions Map Download Metadata

Climate Division Summaries Database

Download  
1961-1990 Nebraska Average Annual Precipitation (PRISM)

Polygon Coverage

Download Metadata

1-inch precipitation contours

Download Metadata

Raster Coverage (ascii grid format)

Download Metadata

Evaluation of Historic Precipitation Data by Climate Division in Checking for Long-Term Trends - Compiled November, 1999.

Download  
Lake Evaporation 1946-1955 (Nebraska) Download Metadata
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Pumpage/Recharge
Weather Station Location Download  
Distribution Polygon Download  
Flowchart of Inputs, Outputs & Processes Download  
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Groundwater Pumping
Monitor Wells in the Central Platte NRD Download Metadata
Monitor Wells in the North Platte NRD Download Metadata
Monitor Wells in the South Platte NRD Download Metadata
Monitor Wells in the Tri-Basin NRD Download Metadata
Monitor Wells in the Twin Platte NRD Download Metadata
Monitor Wells in the Upper Big Blue NRD Download Metadata
Registered Wells Download Metadata
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Groundwater Recharge
PRELIMINARY COHYST modified STATSGO coverage based on work done by Dr Derrel L. Martin of UNL and historic work of Jack Dugan. Download  
PRELIMINARY Theissen polygons of weather stations used by Dr Derrel L. Martin of UNL. Download  
Tributaries drains and canals in the Central Platte NRD Download Metadata
Tributaries drains and canals in the North Platte NRD Download Metadata
Tributaries drains and canals in the Tri-Basin NRD Download Metadata
Tributaries drains and canals in the Twin Platte NRD Download Metadata
Tributaries drains and canals in the South Platte NRD Download Metadata
Gaining Reaches in Upper Big Blue NRD Download Metadata
Canals, Laterals and Drains in the Central Nebraska Public Power and Irrigation District (CNPPID) Download Metadata
Canals, Laterals and Drains in the Nebraska Public Power District (NPPD) Download Metadata
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Aquifer Test Data
No available data yet
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Streamflow Gain/Loss
Streamflow gain/loss in the Republican River Basin, Nebraska

May 1975

 

July 1975

 

October 1975

 

October 1978

 

April to May 1980

 

October 1980

 

October 1981

 

March 1989

 

October 1998

 
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Platte River Cooperative Hydrology Study