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901:		Title:	Evaluation of the accuracy of radar precipitation for use in flow forecasting for the Fox Chain of Lakes.
		Volume/Number:	2006
		Issuing Agency:
		Description:	This study evaluated the use of radar-derived daily precipitation values for estimating watershed precipitation in the Fox River watershed in northeastern Illinois and southeastern Wisconsin, and for the potential use in preparing real-time streamflow forecasts for the Fox River. Two types of radar-derived precipitation estimates based on data from the National Weather Service (NWS) WSR-88D radar network were evaluated. These estimates were developed using a 4-km grid resolution and computed using: 1) radar data alone and 2) composite or multi-sensor precipitation estimate based on radar data and real-time hourly precipitation gage observations. These gridded precipitation estimates were obtained from the National Center for Environmental Prediction (NCEP) and were compared to point measurements of daily precipitation from precipitation gages in the vicinity of the Fox River watershed for the period February 2002-September 2004. Multi-sensor precipitation estimates were found to be a considerable improvement over the gridded radar estimates during all seasons. In comparison to the daily gage data, however, the multi-sensor precipitation estimates were on average 25 percent lower throughout the year. Multi-sensor daily precipitation estimates from four storm periods were input to the Fox River Forecast Model to evaluate their potential application in hydrologic forecasting. Only one storm event produced flooding conditions on the Fox River in the period for which radar data was available. The remaining three storm events analyzed in this report produced only moderately high flows. Simulated flow forecasts using the multi-sensor precipitation values were less accurate than companion forecasts using observed data from precipitation gages. Based on the limited number and size of storm events available for simulation, this study was unable to conclude whether or not the multi-sensor precipitation values would be useful for forecasting floods. Until more comparisons can be conducted using data from future major flood events, flow forecasts for the Fox River should continue to be developed using near real-time data from precipitation gages. The present tendency of the multi-sensor precipitation data to underestimate rainfall amounts also makes their use generally inappropriate for longer term hydrologic simulations.
		Date Created:	5 30 2006
		Agency ID:	CR-2006-05
		ISL ID:	000000000906 Original UID: 999999994481 FIRST WORD: Evaluation

902:		Title:	Handbook on Workers' Compensation and Occupational Diseases
		Volume/Number:
		Issuing Agency:
		Description:	The handbook serves as a general guide to the rights and obligations of workers and employers under workers' compensation in Illinois. This handbook refers only to those injuries or illnesses that occurred before February 1, 2006.
		Date Created:	1990
		Agency ID:
		ISL ID:	000000000907 Original UID: 865 FIRST WORD: Handbook

903:		Title:	Unique 2004 growing season weather conditions resulting in record high crop yields in Illinois and the Midwest.
		Volume/Number:	2005
		Issuing Agency:
		Description:	Weather during the 2004 growing season in the Midwest, along with improved plant genetics and farming practices, produced exceptionally high yields of all major crops with resulting record yields 10 to 25 percent above prior records, an exceptional increase. Record corn and soybean yields in Illinois and five other states had profound effects on crop prices, given the large foreign demand and the decreasing dollar value, resulting in a huge income increase for Midwestern farmers, $13- $14 billion. Crop experts, regional farmers, and crop-weather models failed to detect and predict the enormous magnitude of the final yields. This inability to assess the magnitude of the 2004 crop yields likely resulted from a lack of information about the presence and effect of the frequent days with clear skies in 2004. The number of clear days, 50 percent to 105 percent above average across the entire Midwest, also were accompanied by much below average temperatures and normal rainfall. Examination of Illinois climate conditions over the past 117 years reveals that when many clear days occurred, most summers were quite hot and dry. Only one prior summer (1927) had comparable conditions to those in 2004. Summer 2004 weather conditions also were unusual in other respects, including having characteristics that were beneficial for all crops. For example, prior record high yields occurred in 2003 for corn, in 1994 for soybeans, in 2001 for sorghum, and in 1990 for alfalfa. Seldom does the entire Midwest experience near uniform summer weather conditions, reflecting another climatologically-unique aspect of summer 2004 weather. Canadian high-pressure centers, resulting from the intrusion of 20 strong cold fronts, frequently dominated the atmospheric circulation across the central United States during the summer, limiting the movement of warm, moist air into the region and creating the season's high frequency of clear days.
		Date Created:	2 24 2005
		Agency ID:	DCS-2005-01
		ISL ID:	000000000908 Original UID: 999999994443 FIRST WORD: Unique

904:		Title:	Temporal changes in deep bedrock groundwater quality in northwestern Illinois
		Volume/Number:	2005
		Issuing Agency:
		Description:	Deep bedrock aquifers in northeastern Illinois are an important source of drinking water, but there is evidence of temporal increases in concentrations of dissolved contents in the groundwater. Large groundwater withdrawals may be inducing groundwater movement from adjacent units or downdip areas containing high concentrations of dissolved solids. Archived data were used systematically to examine temporal trends in water-chemistry data for deep bedrock aquifers in northeastern Illinois. Most data suggest that concentrations of major ions and total dissolved solids (TDS) are not increasing in wells open to deep bedrock aquifers in most of northeastern Illinois. There are some locations where concentrations of some ions and TDS are increasing, including the major pumping centers at Joliet and Aurora, however. The increasing concentrations may be affected by aquifer geology. Increasing trends are more likely in wells open to deep Ordovician aquifers than in wells open only to deeper Cambrian aquifers or open to shallower Ordovician aquifers. There also appears to be some areal control on water-chemistry changes. Most of the positive trends occurred in the southern twothirds of the study area. Correlating withdrawal rates with water-chemistry data is problematic due to data limitations, but withdrawal rates do not appear to influence water chemistry of most wells for which data were available.
		Date Created:	6 7 2005
		Agency ID:	CR-2005-05
		ISL ID:	000000000909 Original UID: 999999994455 FIRST WORD: Temporal

905:		Title:	Shallow groundwater quality sampling in Kane County, October 2003.
		Volume/Number:	2005
		Issuing Agency:
		Description:	Seventy-five shallow wells were sampled for water-quality analysis in Kane County in October 2003 to provide a 'snapshot' of groundwater quality in these shallow aquifers and also compare water quality from different parts and aquifers of Kane County. The quality of shallow groundwater in Kane County is generally good, especially in the western and central thirds of the county. However, the total dissolved solids (TDS) concentrations of samples from the eastern third of the county were significantly higher than elsewhere in the county. The ions of greatest concern are chloride and sulfate. Almost two-thirds of the samples from the eastern wells sampled had TDS, chloride, and/or sulfate concentrations above their drinking water standards. Road-salt runoff, vehicular exhaust, and industrial discharges are the most likely sources of these elevated solutes. Because the movement of groundwater is slow, the widespread presence of high TDS groundwater in the eastern urban corridor of Kane County suggests a fairly long history of shallow groundwater contamination. This project provides a baseline for shallow groundwater quality in Kane County. Repeating this study at 5-year intervals, sampling as many of the same wells as possible, would help to determine water-quality changes as Kane County undergoes land-use changes. More detailed studies at more frequent intervals for particularly sensitive areas or those with rapid changes in land use also may be helpful to water resource planners.
		Date Created:	7 6 2005
		Agency ID:	CR-2005-07
		ISL ID:	000000000910 Original UID: 999999994456 FIRST WORD: Shallow

906:		Title:	Operation of the rain gauge and groundwater monitoring networks for the Imperial Valley Water Authority, Year Eleven: September 2002 - August 2003.
		Volume/Number:	2005
		Issuing Agency:
		Description:	The Illinois State Water Survey (ISWS), under contract to the Imperial Valley Water Authority (IVWA), has operated a network of rain gauges in Mason and Tazewell Counties since August 1992. The ISWS also established a network of groundwater observation wells in the Mason-Tazewell area in 1994 that is monitored by the IVWA. The purpose of the rain gauge network and the groundwater observation well network is to collect long-term data to determine the impact of groundwater withdrawals in dry periods and during the growing season, and the rate at which the aquifer recharges. This report presents data accumulated from both networks since their inception through August 2003. Precipitation is recorded continuously at 20 rain gauges. Groundwater levels are measured the first of each month at 13 observation wells. The database from these networks consists of 11 years of precipitation data and nine years of groundwater observations. For the period September 2002-August 2003, the network received an average of 30.06 inches of precipitation, 5.84 inches lower than the network 10-year 1992-2002 average precipitation. Precipitation was below average in the fall, winter, and spring, but above average during the summer of 2003. In 2002-2003, groundwater levels in many wells tended to follow the now-familiar pattern of rising water levels in early spring and peaks in mid-summer before evapotranspiration demands cause water levels to decline. However, the extremely low precipitation that occurred from the period September 2002 through May 2003 (9.23 inches below the 11-year normal) caused a weak recovery before the irrigation season started. Several wells (MTOW-4, -10, -11, and -13) experienced essentially no water-level recovery during this reporting period. Water levels in MTOW-13, in particular, fell throughout the year. That well is located in northeastern Mason County, the area of lowest precipitation. Total irrigation for the June-September period was estimated to be 46 billion gallons (bg), the fourth highest total since monitoring began in 1995 and ranked just after the 47 bg in both 2001 and 2002. This can be attributed, in part, to the growth of irrigation systems in the Imperial Valley, which now has 1,867 systems. To improve our understanding of the relationship between groundwater, stream discharge, and irrigation, an irrigation test site was initiated in April 2003. Nine observation wells were installed in close proximity to an irrigated field that abuts Crane Creek. Transducers with data loggers were installed in two wells in June 2003 to monitor groundwater levels and in Crane Creek to monitor stream stage. Preliminary data are presented.
		Date Created:	9 15 2005
		Agency ID:	CR-2005-06
		ISL ID:	000000000911 Original UID: 999999994457 FIRST WORD: Operation

907:		Title:	Illinois Workers' Compensation Benefit Rates
		Volume/Number:
		Issuing Agency:
		Description:	Lists workers' compensation maximum and minimum benefit rates from 1/15/85 - 1/14/1990 in Illinois.
		Date Created:	1990
		Agency ID:
		ISL ID:	000000000912 Original UID: 860 FIRST WORD: Illinois

908:		Title:	Illinois Workers' Compensation Benefit Rates
		Volume/Number:
		Issuing Agency:
		Description:	Lists workers' compensation maximum and minimum benefit rates from 1/15/1980 - 1/14/1985 in Illinois.
		Date Created:	1985
		Agency ID:
		ISL ID:	000000000913 Original UID: 861 FIRST WORD: Illinois

909:		Title:	Illinois Workers' Compensation Benefit Rates
		Volume/Number:
		Issuing Agency:
		Description:	Lists workers' compensation maximum and minimum benefit rates from 1/15/1990 - 1/14/1995 in Illinois.
		Date Created:	1995
		Agency ID:
		ISL ID:	000000000914 Original UID: 862 FIRST WORD: Illinois

910:		Title:	Illinois Workers' Compensation Benefit Rates
		Volume/Number:
		Issuing Agency:
		Description:	Lists workers' compensation maximum and minimum benefit rates from 1/15/1995 through 1/14/2000 in Illinois.
		Date Created:	2000
		Agency ID:
		ISL ID:	000000000915 Original UID: 863 FIRST WORD: Illinois

911:		Title:	Illinois Workers' Compensation Benefit Rates
		Volume/Number:
		Issuing Agency:
		Description:	Lists workers' compensation maximum and minimum benefit rates from 1/15/2000 - 1/14/2005 in Illinois.
		Date Created:	2005
		Agency ID:
		ISL ID:	000000000916 Original UID: 864 FIRST WORD: Illinois

912:		Title:	Groundwater resources in Champaign County
		Volume/Number:	1950
		Issuing Agency:
		Description:	This investigation is part of a state - wide investigation of groundwater resources being conducted by the State Water Survey Division. Records of more than 1400 wells have been tabulated. These wells penetrate one or more of three separate and distinct aquifers within the glacial drift . The three aquifers penetrated by wells in this are a have unrelated hydrostatic heads. The average daily pumpage from the middle deposits, the major producing aquifer considered in this report, was 7.917 million gallons. It was estimated that a total of 67,812 million gallons of water has been pumped from this aquifer. Water level pressure contour maps of the upper and middle waterbearing deposits show no similarity. Sufficient data are not available to permit the construction of a pressure contour map of the lower deposits. Values of the coefficients of transmissibility and storage have been determined. Values of the coefficient of transmissibility ranged from 10,000 to 400,000 and averaged about 40,000. Values of the coefficient of storage ranged from 0.00024 for short periods to 0.0065 for a 46 year period, the longest for which records are available. Using a coefficient of storage of 0.0065 it was determined that the amount of water removed from storage since pumping began was about 3,187 million gallons or about 5 percent of the total amount of groundwater withdrawn. The amount of inflow into the heavily pumped area at Champaign-Urbana is about equal to the 1948 rate of withdrawal indicating little if any recharge within the 630 contour of the cone of depression. The steep hydraulic gradient and low water levels near the area of heavy withdrawal, together with continued water level recession, suggests that the middle deposits at Champaign-Urbana have been developed to their maximum transmission rate and that some lessening of the rate of withdrawal would be necessary to maintain constant operating water levels.
		Date Created:	1 9 2006
		Agency ID:	RI-6
		ISL ID:	000000000917 Original UID: 999999993871 FIRST WORD: Groundwater

913:		Title:	Leaky artesian aquifer conditions in Illinois
		Volume/Number:	1960
		Issuing Agency:
		Description:	Most if not all of the so called artesian aquifers in Illinois are actually leaky artesian aquifers. If the permeability of the confining bed is very low, vertical leakage may be difficult to measure within the average period (8 to 24 hours) of pumping tests. However, since the cone of depression created by pumping a well tapping a leaky artesian aquifer continues to expand until discharge is balanced by the amount of induced leakage, it does not follow that vertical leakage is of small importance over extended periods of time. As the cone of depression grows in extent and depth, the area of leakage and the vertical hydraulic gradient become large. Accordingly then, with long periods of pumping, contribution by leakage through a confining bed may be appreciable even though the vertical permeability is very low. If a source is available to replenish continuously the confining bed, the cone of depression developed by a well pumping for long extended periods will be influenced by the vertical permeability of the confining bed in addition to the hydraulic properties and geohydrologic boundaries of the main aquifer. Any long-range forecast of well or aquifer yield must include the important effects of leakage through the confining bed. The vertical permeability of a confining bed often can be determined from the results of pumping tests as described in this publication.
		Date Created:	9 24 2004
		Agency ID:	RI-39
		ISL ID:	000000000918 Original UID: 999999993903 FIRST WORD: Leaky

914:		Title:	The 1993 flood on the Mississippi River in Illinois
		Volume/Number:	1994
		Issuing Agency:
		Description:	This report on the 1993 flood on the Mississippi River in Illinois and on the lower reaches of the Illinois River was prepared by the Illinois State Water Survey with assistance from the Illinois Department of Transportation/Division of Water Resources and the Illinois Natural History Survey. The report begins with a brief description of the physical setting of the Upper Mississippi River System, including historical facts on climate, precipitation, hydrology, and floods. The 1993 flood is discussed with regard to precipitation, soil moisture, stages, flows, levee breaches, and discharge through levee breaches. Also discussed are impacts of the flood on social, economic, hydraulic and hydrologic, and environmental aspects of the river and its residents. Impacts on water quality, the environment, and public water supplies, including the beneficial and detrimental aspects of the flood, also are included. The lessons learned from this flood focus on the performance of the levees, governmental responses, the effects of flood fighting, change in stages due to levee breaches, flood modeling, and the lack of information dissemination to the public on the technical aspects of the flood. These lessons point out information gaps and the need for research in the areas of hydraulics and hydrology, meteorology, sediment transport and sedimentation, surface and groundwater interactions, water quality, and levees. The report presents a comprehensive summary of the 1993 flood as far as climate, hydrology, and hydraulics are concerned.
		Date Created:	9 24 2004
		Agency ID:	MP-151
		ISL ID:	000000000919 Original UID: 999999994109 FIRST WORD: The

915:		Title:	The Illinois River: working for our state
		Volume/Number:	1991
		Issuing Agency:
		Description:	The Illinois River is at a crossroads. All the events in its history, both natural and those accomplished through human intervention, are now poised to change the river in ways that may render it unrecognizable in our own lifetimes. This publication is intended to introduce you to the Illinois River and the issues that will shortly determine its very survival.
		Date Created:	9 24 2004
		Agency ID:	MP-128
		ISL ID:	000000000920 Original UID: 999999994138 FIRST WORD: The

916:		Title:	Illinois Rivers Decision Support System (ILRDSS)
		Volume/Number:	2002
		Issuing Agency:
		Description:	The Illinois River has become a focus of state and federal agencies and other organizations interested in integrated watershed management. As a result, issues related to habitat restoration, floodplain management, navigation, erosion and sedimentation, and water quality of the Illinois River are being discussed at the watershed scale. In support of this effort, the Illinois Scientific Surveys have initiated development of the Illinois Rivers Decision Support System (ILRDSS) for use in documenting project activities within the watershed and assessing and evaluating the effectiveness of potential restoration projects and management practices. The ILRDSS will integrate and expand existing databases and numerical models of segments of the Illinois River into an integrated decision support system (DSS) for the entire Illinois River watershed. New databases and models also will be created for the watershed, as well as a comprehensive ILRDSS web portal to all available data and information about the Illinois River and its basin. This report describes the current status of ILRDSS development and serves as an introduction to those unfamiliar with the Illinois Rivers Decision Support System.
		Date Created:	9 24 2004
		Agency ID:	IEM-2002-02
		ISL ID:	000000000921 Original UID: 999999994335 FIRST WORD: Illinois

917:		Title:	Outdoor Illinois
		Volume/Number:
		Issuing Agency:
		Description:	This magazine is a monthly publication published by the Illinois Department of Natural Resources which includes articles on outdoor activities, conservation, state park information. The magazine has articles about plants and animals, state parks and bikeways, nature preserves and outdoor activities. It has many colored photographs and detailed stories about people and nature. The magazine includes new Illinois hunting and fishing regulations, and permit deadlines. It includes a calendar of events each month and a yearly detailed calendar.
		Date Created:
		Agency ID:
		ISL ID:	000000000922 Original UID: NA for serial records FIRST WORD: Outdoor

918:		Title:	McHenry County 2005 Taxing Districts
		Volume/Number:
		Issuing Agency:
		Description:	Illinois Taxing District Map for Tax Year 2005. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research.
		Date Created:	01 31 2006
		Agency ID:
		ISL ID:	000000000923 Original UID: 874 FIRST WORD: McHenry

919:		Title:	McLean County 2005 Taxing Districts
		Volume/Number:
		Issuing Agency:
		Description:	Illinois Taxing District Map for Tax Year 2005. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research.
		Date Created:	01 31 2006
		Agency ID:
		ISL ID:	000000000924 Original UID: 875 FIRST WORD: McLean

920:		Title:	Menard County 2005 Taxing Districts
		Volume/Number:
		Issuing Agency:
		Description:	Illinois Taxing District Map for Tax Year 2005. Geospatial data representing taxing district boundary information collected from Illinois county clerks. Map identifies the boundaries of property tax districts to be used for general illustration and research.
		Date Created:	01 31 2006
		Agency ID:
		ISL ID:	000000000925 Original UID: 876 FIRST WORD: Menard

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