Organization | • | Illinois State Water Survey | [X] |
| | | | Title: | | | | | Volume/Number: | 2005 | | | | Issuing Agency: | | | | | Description: | A key element of the Illinois Generic Management Plan for Pesticides in Groundwater was the use of a statewide map of aquifer sensitivity to contamination by pesticide leaching. This map included soil properties (hydraulic conductivity, the amount of organic matter within individual soil layers, and drainage class) from a digital soil association map and hydrogeologic properties to a depth of 50 feet. The map displayed six mapped units or levels of aquifer sensitivity, and each map unit was subdivided into two map subunits. Each subunit had a distinct combination of soil and hydrogeologic properties. Prior to the implementation of the Generic Plan, the statewide map was tested by sampling shallow groundwater for pesticides from a dedicated monitoring well network. To test this mapping strategy efficiently, a stratified random sampling plan was adopted that focused on the three most sensitive map units. Project goals were to provide data to test the utility of the aquifer sensitivity map to predict pesticide occurrence and to understand pesticide occurrence in shallow groundwater. All monitoring wells were located near agricultural production fields (most within 10 feet of corn and soybean fields) where the only known source of pesticides were those pesticides used in normal agricultural production. Most studies of pesticide contamination covering a broad geographic area sample water-supply wells, and this study using monitoring wells was designed to generate data that might provide a unique perspective on the occurrence of pesticides in shallow groundwater. Prior to the completion of the entire monitoring network, a one-time sampling program of monitoring wells was conducted to assess the distribution of pesticide occurrence across the various units of aquifer sensitivity, and a time-series sampling program was conducted to assess the temporal variability of pesticides in shallow groundwater. For the one-time sampling program, 159 samples were collected from 159 wells from September 1998 through February 2001. For the time-series sampling program, 215 samples were collected from 21 wells from October 1997 through July 2000. These groundwater samples were analyzed for 14 pesticides but no pesticide degradates. In addition, groundwater samples were collected to characterize cations and anions, including nitrate-nitrogen. Data from these initial sampling programs showed that pesticides were detected in 16 to 18% of the samples. Atrazine was the most commonly detected pesticide, followed by metolachlor, butylate, and bromacil. Only one sample had a concentration of a pesticide (atrazine) that exceeded a federal drinking water standard. Most detections were at concentrations less than 1 g/L. Pesticide occurrence was generally dependent on sampling time. The strongest temporal relationship was between post-application (June through October) versus other time frames (November through May). Pesticide occurrence during post-application months was three times higher than during other months. Pesticide occurrence was three times more common in samples when the depth to aquifer material was mapped as less than 20 feet than when the depth to aquifer material was mapped as 20 to 50 feet. Thus, pesticide occurrence was found to be dependent on depth to uppermost aquifer material or the hydrogeologic factor of the tested map. Pesticide occurrence was not dependent on the combined soil and hydrogeologic factors of the tested map. Thus, the new map was not a useful predictor of pesticide occurrence. The median and range of anion and cation concentrations for both sampling programs were similar, except for nitrate-nitrogen concentrations. The median nitrate-nitrogen concentrations for both programs differed slightly, but were less than 3.0 mg/L, which is well below the 10 mg/L maximum contaminant level for nitrate-nitrogen. The nitrate and sulfate concentrations were not uniform across the six subunits. Based on the neural network analysis of the one-time sampling data, the time of sample collection and well depth appeared to be the best parameters for predicting pesticide concentration. Depth to uppermost aquifer material and depth to water also were significant. Aquifer sensitivity to contamination and pesticide leaching class values were not able to predict contamination potential independently; however, their presence with other input parameters improved the prediction of contamination by the neural network analysis. | | | | Date Created: | 1 24 2006 | | | | Agency ID: | COOP-20 | | | | ISL ID: | 000000000959 Original UID: 999999994473 FIRST WORD: Illinois' | |
| | | Title: | | | | | Volume/Number: | 1971 | | | | Issuing Agency: | | | | | Description: | This report presents the climatology of Illinois tornadoes based on data from the 1916-1969 period, and offers a variety of general interest tornado facts. Illinois ranks eighth nationally in the number of tornadoes, but first in deaths and second in tornado damages. On the average, there are 10 tornadoes per year, occurring on five days. The annual average death rate from these storms is slightly over 19with an injured average of 110 people. A majority (65 percent) of Illinois tornadoes occur during March through June, with 15-21 April being the prime 7-day period. Over 40 percent occur between 1500 and 1800 CST, and 65 percent take place from 1400-2000 CST. Five of the outstanding Illinois tornado days of the 1916-1969 period are discussed in detail, including the famed Tri-State tornado of 18 March 1925, the most devastating tornado in the United States since systematic collection of tornado data began in 1916.The general information includes, among other items, basic definitions pertinent to tornadoes, safety precautions, formulation of a tornado forecast, and methods for remote detection of tornadoes. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | C-103 | | | | ISL ID: | 000000000738 Original UID: 999999993755 FIRST WORD: Illinois | |
| | | Title: | | | | | Volume/Number: | 2001 | | | | Issuing Agency: | | | | | Description: | The City of Decatur operates a series of ten groundwater wells in DeWitt and Piatt Counties that serve as an emergency water supply in times of low surface water levels in Lake Decatur. The City of Decatur contracted with Layne-Geosciences, Inc. (LGI) to develop a computer model of the groundwater system to simulate the effects of pumpage on the Mahomet Aquifer and surrounding wells. The LGI model was completed in April 1999. In response to lowering lake levels, Decatur began pumping their wells in November 1999 for 84 days at daily rates from 3 million gallons a day (mgd) to 16 mgd. The Illinois State Water Survey (ISWS) reviewed and tested the LGI model against the known drawdown encountered during the 84 days of operation. The LGI model was found to be only marginally successful in reproducing the measured water levels. The largest error occurred in the Piatt County area where the model significantly overpredicted the drawdown. These errors were the result of several factors, including errors in the aquifer thickness map, calibration to data only within 5 miles of the wellfield, errors in the location of pumping wells, the use of general head boundaries throughout the model, and, most importantly, the absence of a hydraulic connection between the Mahomet Aquifer, the Glasford Aquifer, and the Sangamon River near Allerton Park. Additional data available in the ISWS well records, and new data provided by Decatur through Guillou and Associates, Inc., indicate a connection between the aquifer system and the Sangamon River. Adding this connection represents a change in the conceptual model of the flow system not included in the LGI model. When this connection was added, a much closer match between observed and calculated water levels was obtained. Future work should focus on developing a more complete understanding of the connections between the aquifer system and the Sangamon River. Those efforts should include a pump test of the Cisco wellfield with complete monitoring of the river and aquifers. Monitoring of water levels at selected locations should continue and expand. The groundwater flow model should be re-calibrated using the new data and the improved understanding of the flow system. The results of these activities can provide an improved assessment of the potential of the Decatur wellfield for future use. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | CR-2001-11 | | | | ISL ID: | 000000000839 Original UID: 999999994322 FIRST WORD: The | |
| | | Title: | | | | | Volume/Number: | 1999 | | | | Issuing Agency: | | | | | Description: | A field-scale project in Mason County, Illinois, was performed to monitor the movement of nitrate in ground water beneath an irrigated field. Chemical tracers were used to assess the migration of solutes both laterally and vertically under the influence of an irrigation well and to determine the amount of recycling at a site due to irrigation pumpage and the amount of off-site transport of nitrate due to regional ground-water flow. Water samples from the sand aquifer at the site reveal considerable spatial and temporal heterogeneity in aqueous chemistry. Recharge is rapid in this system, and it is probable that the water chemistry of the recharge water also is variable spatially and temporally; it is especially influenced by agricultural practices. Nitrate (NO3-) concentrations are elevated in a zone between approximately 15 and 30 feet (ft) beneath the surface, although this zone was not persistent laterally or with time. The maximum nitrate concentrations in this zone were slightly greater than 20 milligrams per liter (mg/L) as nitrogen, well above the drinking water standard of 10 mg/L. Nitrate was generally absent below 30 ft in the aquifer, probably due to denitrification reactions. The tritium data suggest that vertical movement of solutes in the aquifer is rapid, and that there has been enough time to transport solutes from the surface or soil zone to depths in excess of 100 ft. Because drinking-water wells generally are screened well below the zone of elevated nitrate concentrations in this area, it appears that fertilizer applications do not have a negative effect on drinking-water quality for most homeowners. From the results of tracer tests, the effects of irrigation pumping on solute transport are measurable but not substantial. Tracer movement both horizontally and vertically was slight under pumping conditions, less than 10 ft horizontally and between 1 and 2 ft vertically about 100 ft from the irrigation well after three days of pumping. The vast majority of nitrate applied in this area is not being recycled through the irrigation wells. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | RR-128 | | | | ISL ID: | 000000000947 Original UID: 999999994252 FIRST WORD: Impact | |
| | | Title: | | | | | Volume/Number: | 1987 | | | | Issuing Agency: | | | | | Description: | This investigation is the first of three phases of a ground-water management study. In this report, effects of irrigation and drought on the ground-water resources of Illinois are examined. Irrigation water use for five soil types is estimated from a monthly water budget model on the basis of precipitation and temperature data from the last 30 years at selected weather stations across Illinois. Moisture deficits are computed for each soil type on the basis of the water requirements of a corn crop. It is assumed that irrigation is used to make up the moisture deficit in those places where irrigation systems already exist. Irrigation water use from each township with irrigated acreage is added to municipal and industrial ground-water use data and then compared to aquifer potential yields. The spatial analysis is accomplished with a statewide geographic information system. An important distinction is made between the seasonal effects of irrigation water use and the annual or long-term effects. The model is tested for its sensitivity to weather variation; seasonal water deficits are calculated by using data from extreme growing seasons and extended drought periods. The effect of increasing the amount of irrigated land by 50 percent is also considered for normal weather conditions and droughts. The effect of variable irrigation demand on ground-water resources is expressed as the ratio of ground-water use to ground-water potential yield for each township. This is done to highlight regions most susceptible to ground-water stress because of drought or increased irrigation by showing where use could exceed yield. The sensitivity of the results is not tested for variations in spatial aggregation. This will be one of the primary tasks in subsequent study phases. Results show that irrigation is a substantial seasonal consumptive ground-water use in Illinois, with the potential for growth. However, present effects appear to be localized and highly dependent on weather conditions. Some potential for seasonal or temporary overpumpage may exist in the heavily irrigated areas during years with below-normal precipitation or during extended droughts. The aquifers being used for irrigation appear to have the ability to recover from present irrigation demands without suffering significant depletion, implying that the annual effect of irrigation is currently relatively minimal. The exception to this may be during extended drought periods, especially if widespread expansion of irrigation practices also occurs in the state. A 50 percent expansion of irrigation would appear to have surprisingly little additional impact on ground-water resources under most climatic conditions. That degree of growth around currently irrigated land would result in expanded irrigation areas still within reach of the productive, high-yielding aquifers already being pumped for irrigation. A much larger degree of irrigation expansion into areas with heavier-textured soils is possible in Illinois. The availability of ground-water would be a major limiting factor in the speed and direction of that expansion. That kind of massive irrigation expansion is not considered in this report; however, its effects on the state's ground water are assumed to be considerable and will be addressed in subsequent study phases. The Chicago metropolitan area stands out as a major region of overpumpage, but not because of irrigation. Variable irrigation pumpage does appear to consistently affect several other regions, most notably parts of Mason, Kankakee, Tazewell, Lee and Whiteside Counties. The degree to which these counties are affected by irrigation depends largely on weather conditions. For all these counties, with the possible exception of Kankakee, surficial sand and gravel aquifers are the most susceptible to stress from drought and irrigation water use. Shallow bedrock aquifers may also be impacted by irrigation in parts of Kankakee County. The impact of an extended drought is likely to be more widespread and inconsistent because of the multiple effects of increased water use for irrigation and other demands, and reduced ground-water storage. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | RI-109 | | | | ISL ID: | 000000000936 Original UID: 999999993972 FIRST WORD: Impacts | |
| | | Title: | | | | | Volume/Number: | 1990 | | | | Issuing Agency: | | | | | Description: | In this report, the Illinois State Geological Survey (ISGS) and the Illinois State Water Survey (ISWS) have responded to the mandate of the Illinois Groundwater Protection Act that the Illinois Department of Energy and Natural Resources (IDENR) evaluate the impact of pesticides upon groundwater. This preliminary evaluation summarizes data on the extent of groundwater contamination by pesticides, identifies agricultural practices that may contribute to groundwater contamination, and presents recommendations to minimize contamination. | | | | Date Created: | 5 20 2005 | | | | Agency ID: | COOP-12 | | | | ISL ID: | 000000000769 Original UID: 999999993859 FIRST WORD: An | |
| | | Title: | | | | | Volume/Number: | 2004 | | | | Issuing Agency: | | | | | Description: | This report presents extensive information from recently published findings related to the following two critical questions about climate change: andlt;ULandgt; andlt;LIandgt;What will the future climate be like? andlt;LIandgt;What will the effects be, both good and bad? andlt;/LIandgt;andlt;/ULandgt;Chapter 1 introduces the two main chapters of the report that provide insights to the above two critical questions about climate change. Chapter 2 provides examples from a wide spectrum of scientists, scientific organizations, and the media of contradictions and confusion about whether human-induced climate change is predictable over the time scale of a century. It then explains why such climate change is unpredictable in the traditional deterministic sense. It describes the climate system and documents improvements and remaining uncertainties of global climate models relevant to evaluating human-induced climate change on the century time scale. Climate measurements in Illinois since the mid-19th century document major climate swings not evident in a 50- to 100-year record. Illinois is no warmer or wetter today than it has been over the last 150 years, and extreme precipitation events across the country are reported to be no more frequent than they were a century ago. Important conclusions from these data are that i) regional climate trends over the past 50-100 years that are consistent with theoretical expectations of an enhanced greenhouse effect (for example, higher precipitation and more heavy rainfall events in northern mid-latitudes) do not necessarily establish causality; and ii) global warming has not resulted in warming in all parts of the globe. Chapter 3 focuses on the issue of economic impacts of weather and climate in the United States (US). The first section addresses known financial impacts of recent (1950-2000) weather and climate conditions. Descriptions follow of temporal trends of weather and climate extremes and their impacts, causes for on-going increases in economic impacts, and estimates of future financial impacts under a changed climate. The frequency of most types of storms and droughts either has not changed or has decreased during 1940-2000. Yet, losses (1997 dollars) for most storm types have increased over time. Possible causes for increased losses include a shift in climate related to global warming, questionable insurance practices, and aging infrastructure. Study also shows increasing losses due to societal factors, including population growth, more people residing in more weather vulnerable areas, shifts in business-product development that are weather sensitive, and growing wealth. Various studies of weather- and climate-induced economic impacts were used to develop national loss and gain estimates. Projections for the US, depending upon varying assumptions about the future climate (combinations of warmer, wetter, drier, or more storms), show annual climate-related losses ranging from $2 billion to $69 billion, and others estimate annual gains of $30 billion to $40 billion. In all cases, the projected outcomes are small in relation to the expected Gross Domestic Product. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | IEM-2004-01 | | | | ISL ID: | 000000000949 Original UID: 999999994422 FIRST WORD: Insights | |
| | | Title: | | | | | Volume/Number: | 1991 | | | | Issuing Agency: | | | | | Description: | Biweekly and total irrigation amounts and irrigation scheduling practices were monitored at representative sites in central Illinois during the 1988 and 1989 growing seasons. The purpose was to gather baseline information on average quantities of irrigation water used in normal and drought years and on the general efficiency of irrigation operations in the subhumid climate of Illinois. Soil water-holding capacity is the most important factor in determining irrigation amounts, explaining about 65 percent of the variability in irrigation totals. Other important factors in explaining irrigation variations include weather changes, individual farmer idiosyncrasies, and crop differences. In general, irrigation farmers in Illinois appear to be applying appropriate amounts of irrigation water at appropriate times in the growing season, based on their soil type, crop type, and total evaporative losses. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | RR-118 | | | | ISL ID: | 000000000938 Original UID: 999999993981 FIRST WORD: Irrigation | |
| | | Title: | | | | | Volume/Number: | 2007-6 | | | | Issuing Agency: | | | | | Description: | Prompted by concerns for their countys water resources, Kane County officials funded a multifaceted project to be conducted by the Illinois State Water Survey (ISWS) and Illinois State Geological Survey (ISGS). The project, initiated in May 2002 and scheduled to conclude in December 2007, will provide baseline water-resources data, analyses, and tools for future analyses of water resources available to the county. | | | | Date Created: | 10 03 2007 | | | | Agency ID: | Contract report 2007-06 | | | | ISL ID: | 000000004075 Original UID: 3923 FIRST WORD: Kane | |
| | | Title: | | | | | Volume/Number: | 2005 | | | | Issuing Agency: | | | | | Description: | Prompted by concerns for their county's water resources, Kane County officials funded a multifaceted project to be conducted by the Illinois State Water Survey (ISWS) and Illinois State Geological Survey (ISGS). The project, initiated in May 2002 and scheduled to conclude in May 2007, will provide baseline water-resources data, analyses, and tools for future analyses of water resources available to the county. This report presents and discusses groundwater data and analyses performed as a part of the ongoing investigations in Kane County. Shallow aquifers considered include the unconsolidated sand-and-gravel aquifers and the uppermost bedrock (i.e., the shallow bedrock aquifer). Deeper bedrock aquifers, including the productive Ancell Group and Ironton-Galesville sandstones, are not within the scope of this study, but are discussed in other ISWS reports. The study area includes Kane County and adjacent townships covering a total area of 1260 square miles. A network of 1010 private, public, industrial, and commercial wells was assembled during the inventory phase (May 2002 -August 2003). During the synoptic phase (September -October 2003), water-level measurements were collected from those wells. Waterlevel data were used to construct potentiometric maps for four shallow aquifers: the unnamed tongue below the Batestown Member, the Ashmore Tongue, the aggregated Glasford Formation sands, and the shallow bedrock. Using only groundwater data to constrain the potentiometric surfaces of individual aquifers, the potentiometric surfaces still closely correlated with perennial stream configurations and land-surface topography. The Fox River and Marengo Ridge are the most influential features that determine regional groundwater flow patterns in the county. Groundwater flow west of the Fox River is predominantly to the south and east. East of the Fox River, flow is to the south and west. The interim potentiometric maps can be used to characterize regional groundwater flow, identify areas of groundwater recharge and discharge, determine regional effects of groundwater withdrawals, and provide a baseline for comparison with future groundwater conditions. The maps will be useful in developing a conceptual model of groundwater flow and mathematical groundwater flow models for a wide range of analyses, including aquifer development scenarios. In 2003, 46 high-capacity wells accounted for 6.3 billion gallons or 97 percent of the total reported groundwater withdrawals of 6.5 billion gallons from the shallow aquifers in Kane County. If unreported withdrawals also are estimated, total withdrawals in 2003 may have been as much as 6.9 billion gallons. Groundwater withdrawals appear to have locally influenced the head surfaces, particularly in east-central and southeastern Kane County. Areas of relatively low head in the shallow bedrock aquifer may reflect large withdrawals from the aquifer, hydraulically connected units, and/or areas of significant discharge to the Fox River. A preliminary analysis of aquifer connections was based on potentiometric surfaces. Areas of potential aquifer connection were identified solely on similarity of measured heads. However, to refine this analysis, aquifer connections need to be evaluated further, taking into account aquifer concurrence and predicted thicknesses of intervening clay-rich geologic deposits. Nomenclature previously used to describe the aquifers of Kane County needs to be reevaluated to address vertical and horizontal aquifer continuity. That reevaluation will require additional geological modeling to more fully characterize and differentiate hydrostratigraphic units of importance such as sands in the Tiskilwa and Glasford Formations. Interim potentiometric maps presented in this report are subject to change as the conceptual hydrostratigraphy evolves. If the interim maps require changes, final versions will be released in the final report on groundwater investigations in 2007. | | | | Date Created: | 5 12 2005 | | | | Agency ID: | CR-2005-04 | | | | ISL ID: | 000000000883 Original UID: 999999994453 FIRST WORD: Kane | |
| | | Title: | | | | | 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 | |
| | | Title: | | | | | Volume/Number: | 1999 | | | | Issuing Agency: | | | | | Description: | An analysis of long-term records of corn yields, water resource conditions, and seasonal weather conditions in Illinois found major temporal shifts and important spatial variations in the types of seasonal weather conditions that have positive and negative impacts on yields and water conditions. Nineteen different types of corn-weather seasons (May-August) occurred during 1901-1997, of which nine types accounted for most of the high corn yields (highest 20 of the 97 values) and eight types produced most low yields (lowest 20 values). An assessment of the years with either high or low yields revealed three findings about the distributions of the corn-weather seasons creating these extremes: 1) some types were uniformly distributed throughout the century; 2) others were unevenly distributed over time, some occurring only in the century's early decades and others only in the last few decades; and 3) certain types varied greatly regionally. Yield responses to certain seasonal types varied over time. The findings helped establish that changes in farming practices, corn varieties, and agricultural technology all affect how a given type of growing season affects corn yields. Sizable regional differences in yield outcomes from a given set of weather conditions, a result of varying soil and climate differences across Illinois, further revealed how impacts of similar seasonal weather conditions can vary spatially. These two conclusions revealed the importance of using weather effects in defining seasonal extremes. In general, the statewide results showed that the types of seasons creating high yields predominated during 1901-1910 and 1961-1997, and most seasons creating low yields were concentrated in 1911-1920, 1931-1940, and 1951-1960. Major seasonal weather effects on Illinois' water resources (surface water supplies, ground-water supplies, and water quality) were found to occur in the spring and summer seasons. Two conditions caused these effects in each season: either above normal temperatures and below normal precipitation, or above normal temperatures and precipitation. Spring impacts on water resources were typically mixed, some negative and some positive, whereas impacts from summer season extremes had largely negative impacts on water supplies and water quality. More impacts, positive and negative, occurred in southern Illinois than elsewhere, and most of the seasons having negative impacts on water resources occurred in Illinois during 1911-1960. Comparison of the 1901-1997 temporal distributions of yield extremes (high and low) and the negative summer water resource impacts with the temporal distributions of cyclone passages and the incidence of El Nio Southern Oscillation conditions that affect spring and summer weather conditions revealed a generally good relationship. Periods with many seasons creating numerous negative impacts on corn yields and water resources occurred in several decades (1911-1920, 1931-1940, and 1951-1960) when the number of cyclones was low and most incidences of La Nia conditions that create warm temperatures and negative impacts prevailed. Conversely, when seasonal weather conditions were generally beneficial (1901-1910, 1961-1970, and 1981-1997), Illinois had relatively large numbers of cyclone passages and most El Nio-related cool and wet summers occurred. Consideration needs to be given to the shifting temporal responses to various kinds of seasonal weather conditions during the 20th century to determine how future climatic conditions may affect Illinois' agriculture and water resources. Furthermore, some influential seasonal weather types appeared sporadically, some only during the early decades of the century and others only in the latter decades. Thus, data from the past 97 years reveal that efforts to project impacts of future climate conditions on agriculture and water resources may be difficult and subject to considerable error. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | RR-127 | | | | ISL ID: | 000000000948 Original UID: 999999994058 FIRST WORD: Long | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | This web page provides general information on the Mahomet aquifer, groundwater quality, and the human demands on it. | | | | Date Created: | 01 12 2007 | | | | Agency ID: | | | | | ISL ID: | 000000003002 Original UID: 2869 FIRST WORD: Mahomet | |
| | | Title: | | | | | Volume/Number: | 2001 | | | | Issuing Agency: | | | | | Description: | One of the main concerns was the ability to specify proper stage hydrographs at the downstream boundary of the Lower Illinois River for hydraulic design and analysis. We found that a unique stage-discharge rating relationship does not exist at the lower boundary of the Lower Illinois River at Grafton because of backwater effects from the Upper Mississippi River. Management options and results for managed storage and emergency activities need to be analyzed under more comprehensive design of flooding conditions. To improve the capability of UNET for modeling backwater effects for the Lower Illinois River, an extended model including Pool 26 of the Upper Mississippi River was developed. The downstream stations of the model are at the tail of Lock and Dam 25 and the Mel Price Lock and Dam pool, where stage readings are available. The model was calibrated with a 1979 flood and verified with a 1983 flood. Discharge and stage frequency analysis have also been performed for stations at Troy on Cuivre River, Lock and Dam 25 tail, Lock and Dam 26 pool, and Mel Price Lock and Dam on the Mississippi River. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | CR-2001-10 | | | | ISL ID: | 000000000840 Original UID: 999999994323 FIRST WORD: Management | |
| | | Title: | | | | | Volume/Number: | 2001 | | | | Issuing Agency: | | | | | Description: | This report documents the structure and the use of a windows-based interface developed by the Illinois State Water Survey for the Office of Water Resources, Illinois Department of Natural Resources. The current version of the interface program is able to download historic, real-time, and forecasted stage and flow data from the U.S. Geological Survey, U.S. Army Corps of Engineers, and the National Weather Service websites interactively. These data are used to update existing Data Storage System (DSS) database or to create new ones; to run the UNET model for historic, design, real-time, and forecasted flood events in the Lower Illinois River; and to post-process model outputs from DSS files in tabular and graphical formats.. This interface program uses the original UNET generic geometry and boundary condition files to maintain the same level of accuracy as the UNET model, but it also allows the user to change some of the parameters, such as, the simulation time interval, time windows, and numerical Corant number, and etc., in the BC file. The real-time simulation of a flood event simulates the flood stage profiles using forecasted stage and real-time flow data downloaded from related websites. With the primary focus on simulations of levee failures, the interface program lets the users modify parameters to simulate simple levee failures through the simple spillway approach for two types of complicated embankment failures, overtopping and piping. A new simulation can be performed using the modified levee information. The change of water surface elevation induced by modifying the levees can be compared with another simulation graphically and also in table format. Stage profiles from all the simulations can be plotted together with the levee heights on both sides of the channel along the Lower Illinois River to provide a visual view of the locations of overtopping. Overtopping locations and magnitudes will be tabulated should they occur. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | CR-2001-16 | | | | ISL ID: | 000000000857 Original UID: 999999994333 FIRST WORD: Management | |
| | | Title: | | | | | Volume/Number: | 2005 | | | | Issuing Agency: | | | | | Description: | A new method for estimating the groundwater contribution area (GCA) for Illinois nature preserves was demonstrated using 12 test sites (Bluff Springs Fen, Braidwood Dunes and Savanna, Elizabeth Lake, George B. Fell, Goose Lake, Illinois Beach, Lake in the Hills Fen, Lockport Prairie, Parker Fen, Romeoville Prairie, Spring Grove Fen, and Volo Bog). The sites were selected for their varied hydrogeologic settings and available hydrogeologic data. None of the sites had sufficient local groundwater studies available to identify an entire GCA. Regional studies available for six preserves readily could be used to identify a regional GCA. The amount of hydrogeologic data available for any given preserve will vary, but for most Illinois nature preserves groundwater studies are not available to evaluate groundwater flow conditions. Because contribution areas must be determined to address site management issues, this new method accommodates those sites by identifying GCAs using available information. In particular, it uses published hydrologic and geologic data, if available, as well as uncompiled water-level data, and proxy data adjusted by best professional judgment to account for significant features affecting shallow, unconfined groundwater flow. Surface watersheds were delineated and adjusted based on significant hydrologic features (e.g., water elevations in ponds, streams, and wetlands; infrastructure such as ditches, sewers, and roadways) to develop adjusted surface watershed areas (ASWAs) for all 12 sites. These ASWAs and regional GCAs were compared to determine the viability of substituting ASWAs for regional GCAs at preserves lacking groundwater-level data. The ASWAs identified between 7 and 68 percent of the regional GCAs. More importantly, the ASWAs included the most hydrologically significant locations directly upgradient of each preserve. Use of an ASWA to estimate groundwater flow will not be effective in some hydrogeologic settings, including those where confined groundwater sources, karst terrains, and significant groundwater withdrawals may be a factor. Regional GCAs and ASWAs were combined at each site to create final GCAs that attempt to identify all areas that could contribute groundwater to a nature preserve. Final GCA estimates presented in this report will be useful to determine areas where a Class III (also known as Special Resource) groundwater designation could be applied under Title 35 Section 620.230(b) of the Illinois Administrative Code. They also identify areas of important groundwater resources where it may be most effective to focus management or acquisition efforts to ensure preserve integrity. | | | | Date Created: | 1 25 2006 | | | | Agency ID: | CR-2005-11 | | | | ISL ID: | 000000000941 Original UID: 999999994471 FIRST WORD: A | |
| | | Title: | | | | | Volume/Number: | 2001 | | | | Issuing Agency: | | | | | Description: | Brochure describing the research and services available from the Midwestern Regional Climate Center (MRCC) help to better explain climate and its impacts on the Midwest, provide practical solutions to specific climate problems, and allow us to develop issues-based climate information for the Midwest. Our data and information focus primarily on applications to climate-sensitive sectors and scientific research. In addition to providing on-line access to the interactive, subscription-based Midwestern Climate Information System (MICIS), the MRCC web site provides climate statistics for the Midwest and links to climate resources around the country. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | IEM-2001-01 | | | | ISL ID: | 000000000894 Original UID: 999999994318 FIRST WORD: Midwestern | |
| | | Title: | | | | | Volume/Number: | 1908 | | | | Issuing Agency: | | | | | Description: | The State Water Survey of Illinois began the investigation of the waters of the State in 1895. While the Survey has laid special stress on the determination of the character of the waters from a sanitary standpoint, it has also often been called upon to make analyses of the mineral content to determine its character from a medicinal or commercial standpoint. In the various reports so far issued by the Survey only results of the sanitary investigations were published. It had been the intention to publish the results of the mineral analyses in a previous report but this had to be postponed until the present time when, in cooperation with the Geological Survey, it has become possible. This Bulletin, primarily, contains the records of the analyses made to determine the composition of the mineral residue with reference to the value of the water for manufacturing and medicinal uses, but there are also included the sanitary analyses, wherever such analyses have been made. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | B-4 | | | | ISL ID: | 000000000723 Original UID: 999999992004 FIRST WORD: The | |
| | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | The objective of the Illinois State Water Survey work was to develop a simple model to evaluate the suitability of many crops for Illinois conditions, but also with application for other geographic regions. | | | | Date Created: | 01 21 2004 | | | | Agency ID: | | | | | ISL ID: | 000000001912 Original UID: 1780 FIRST WORD: Model | |
| | | Title: | | | | | Volume/Number: | 2005 | | | | Issuing Agency: | | | | | Description: | This publication provides an Introduction to the Mercury Deposition Network (MDN), which is the mercury wet-deposition monitoring arm of the National Atmospheric Deposition Program (NADP). The NADP is a cooperative monitoring program comprised of federal and state agencies, academic institutions, Native American tribal governments, and private organizations. The work of MDN is descibed, as is the danger of mercury to humans. Readers are encouraged to join MDN. | | | | Date Created: | 12 22 2005 | | | | Agency ID: | IEM-2005-03 | | | | ISL ID: | 000000000954 Original UID: 999999994475 FIRST WORD: Monitoring | |
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