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Feasibility of forecasting surface ozone concentrations in the Chicago area

 Volume/Number:  2003  
 Issuing Agency:  Illinois State Water Survey 0038
 Description:  Episodic controls on sources of ozone precursor gases have been suggested as an alternative to continuous controls as a strategy for reducing ozone concentrations to meet current air quality standards. To show the feasibility of episodic controls to meet ozone air quality standards, it is first necessary to show that it is feasible to forecast surface ozone concentrations with sufficient accuracy and sufficient lead time that episodic controls can be instituted. This study examined the feasibility of a statistical forecast of surface ozone concentrations in the Chicago area (Lake, Cook, and DuPage Counties), based on current concentrations and current and expected weather conditions. Forecast methods were developed using historical data on surface ozone concentrations and meteorological variables measured from 1990-1995. Overall, the study included: andlt;ULandgt; andlt;LIandgt;An extensive literature review and summary. andlt;LIandgt;Documentation of forecast methods used to call Ozone Action Days. andlt;LIandgt;Analysis of Ozone Action Days called in 1995-1997. andlt;LIandgt;Creation of air quality and meteorological databases. andlt;LIandgt;Examination of bivariate relationships between ozone and meteorological variables, including back trajectories on days with high ozone concentrations. andlt;LIandgt;Development of four forecasting approaches involving regression equations and two methods of adjusting or enhancing the results of the regression equations. andlt;LIandgt;Analyses of forecasts based on the four approaches.andlt;/LIandgt;andlt;/ULandgt; 
 Agency ID:  CR-2003-07 
 ISL ID:  000000000882   Original UID: 999999994354 
  Documents:  20061002191133_ISWSCR2003-07.pdf


Flood protection and management for the Lower Illinois River system, Phase III : real-time simulation of floods with managed LDD storage options

 Volume/Number:  2003  
 Issuing Agency:  Illinois State Water Survey 0038
 Description:  This report documents the structure and the use of an improved version of the Windows-based interface of the unsteady flow model, UNET. This interface was 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 can download historic, real-time, and forecasted stage and flow data from U.S. Geological Survey, U.S. Army Corps of Engineers, and National Weather Service Web sites interactively. These data can be used to update an existing Data Storage System (DSS) database or to create new ones. The interface allows the user to create or update gaging station information in a Microsoft Access database. The user can create project files to run the UNET model for historic, design, real-time, and forecasted flood events. The graphing function allows plotting of single and multiple hydrographs, or stage profiles of a single reach and multiple reaches. The utility tools include screen captures, document editing, and DSS file editing. 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. Real-time simulation of a flood event simulates flood stage profiles using real-time stage and flow data downloaded from related Web sites. Locations and magnitudes of levee overtopping will be displayed for the lower Illinois River should these occur. The interface program lets the user modify parameters to simulate simple levee failure or two types of complicated embankment failures, overtopping and piping. Simulations also can be performed using the modified levee information, such as breaches or revised crest elevations. The change of water surface elevation induced by modifying levees can be compared with another simulation graphically and also in table format. Stage profiles from all simulations can be plotted together with levee heights on both sides of the channel along the Lower Illinois River to visually show the impacts of particular floods. 
 Agency ID:  CR-2003-03 
 ISL ID:  000000000880   Original UID: 999999994352 
  Documents:  20061002190737_ISWSCR2003-03.pdf


Fox Chain of Lakes investigation and water quality management plan

 Volume/Number:  1977  
 Issuing Agency:  Illinois State Water Survey 0038
 Description:  This report is a cooperative project of the Illinois State Water Survey and StateGeological Survey. Part 1, prepared by the Geological Survey, discusses the geologic history and character of bottom sediments. Parts 2 and 3 were prepared by the Water Survey. Part 2 presents the hydraulic and hydrologic conditions of the Chain. Part 3 discusses the water quality and sources of nutrients and the living organisms. Part 3 also evaluates remedial measures found effective in other locations and proposes a reliable water managementprogram. 
 Agency ID:  COOP-5 
 ISL ID:  000000000768   Original UID: 999999993852 
  Documents:  20060928185752_ISWSCOOP-5.pdf


Fox River streamflow assessment model: 1999 update to the hydrologic analysis

 Volume/Number:  1999  
 Issuing Agency:  Illinois State Water Survey 0038
 Description:  The Illinois Streamflow Assessment Model (ILSAM) was developed to provideneeded streamflow information to watershed managers and planners. This specialized software program was developed for use on a personal computer to provide estimates of the long-term expected magnitude of streamflow at various frequencies for any stream location along a major stream in a watershed.The purpose of this study was to update ILSAM for the Fox River Basin, a modeloriginally developed in 1988. Over time, climate variability and changes in humanfactors, such as land and water use, and water resource projects, can greatly affect the quantity and distribution (both in space and time) of surface waters in a river basin. For this reason, the data sets used by ILSAM were designed to be updated periodically, perhaps every 5 to 15 years. The frequency of and need for updates are governed by the rate at which streamflow conditions in the watershed change over time. The model update for the Fox River Basin addresses four areas that influence the flow frequencies and their estimation:- Increases in population, overall water use, and the resulting effluent discharges.- A new public water supply withdrawal from the Fox River and increases inmagnitude of existing withdrawals.- General increases in streamflow magnitude caused by climatic variability and the overall increase in average precipitation.- Adoption of improved regional equations from which to estimate flow at ungaged s i t e s . 
 Agency ID:  CR-649 
 ISL ID:  000000000801   Original UID: 999999994055 
  Documents:  20060929185733_ISWSCR-649.pdf


Frequency distributions of heavy rainstorms in Illinois

 Volume/Number:  1989  
 Issuing Agency:  Illinois State Water Survey 0038
 Description:  This publication represents a condensed version of an extensive report on the distributions of heavy rainstorms in Illinois, based on data for 61 precipitation stations operated during 1901-1983. Shown are annual frequency distributions of point rainfall for periods ranging from 5 minutes to 10 days and for recurrence intervals varying from 2 months to 100 years. Results are presented in two forms: mean relations for ten regions of approximately homogeneous precipitation climate, and statewide isohyetal maps based on the 61-station data The report also discusses the results of a special investigation pertaining to Chicago and the surrounding six counties subject to urban influences on the precipitation distribution. The final section of the report provides information on the urban influences on the two Illinois counties adjacent to St. Louis. 
 Agency ID:  C-172 
 ISL ID:  000000000762   Original UID: 999999993832 
  Documents:  20060928184844_ISWSC-172.pdf