| | 221: | | Title: | | | | | Volume/Number: | 2002 | | | | Issuing Agency: | | | | | Description: | The hydrologic regime of a natural stream is usually highly complex and encompasses a wide range of discharges. The magnitudes and frequencies at which the various discharges occur play a key role in creating the channel's morphology. The concept of 'dominant discharge' proposes that there exists a single steady discharge that, theoretically, if constantly maintained in a stream over a long period of time would form and maintain the same basic stable channel dimensions as those produced by the long-term natural hydrograph. This theoretical discharge is referred to as a stream's dominant discharge. If such a dominant discharge exists and can be accurately calculated, this discharge can be one of the tools that stream restoration personnel use to help design channels that are morphologically stable, i.e., not experiencing either excessive erosion or sediment deposition. There is no direct method to calculate a stream's dominant discharge, and stream researchers have commonly assumed that the dominant discharge can be equated with either the stream's bankfull discharge, a specific flood recurrence interval, or the stream's effective discharge. The purpose of this study is to analyze the available data and existing computational methods for the third approach, that being the estimation of effective discharges specific to Illinois streams. The effective discharge of a stream is defined as the single discharge rate that carries the most sediment over time. Note that the effective discharge is not typically a discharge associated with the most extreme flood events, which may carry large amounts of sediment load but occur infrequently. Instead it is commonly considered to be a moderately high discharge having a more modest load, but occurring frequently enough that in the long-run it carries more sediment than the extreme flood events. To facilitate computations, the effective discharge is estimated as occurring within a discharge class or increment, rather than as a single discharge. Effective discharge can be estimated using data on suspended sediment load, bed load, bed material, or total sediment load, with the method of estimation depending on the sediment transport characteristics of the stream, available data, and, to some degree, the researcher's school of thought. For this study, estimates of effective discharges are based on the suspended sediment load, which is the dominant load in most Illinois streams. Suspended sediment data collected at 88 gaging stations within Illinois were analyzed to determine which gaging stations in Illinois currently have sufficient suspended sediment data available to estimate effective discharges. A procedure was adapted from previous research and implemented to compute effective discharge values for each stream location having sufficient suspended sediment data. For each of those gaging stations, an estimate was made of the flow frequency at which the effective discharge was equaled or exceeded. For stations having adequate sediment data, flood recurrence intervals associated with effective discharge values were computed using annual maximum flow data. Correlation coefficients (r2) for 12 linear regressions are presented to describe the relationship between six effective discharge parameters and channel slope and watershed area. The data from 20 of the 88 gaging stations were deemed sufficient for computing effective discharge values. These 20 gaging stations were located on streams with watershed areas ranging from 244 to 6363 square miles (mi2). The relatively large watershed areas allow use of mean daily discharge values in computing effective discharge values. The annual maximum series analysis indicated that recurrence intervals associated with effective discharges found at these stations ranged from less than 1.01 years to 1.23 years. Such recurrence intervals are on the low end of the 1- to 3-year recurrence intervals commonly reported in other studies. However, these recurrence intervals are representative of Illinois' larger watersheds, and recurrence intervals of effective discharges in smaller Illinois watersheds could be quite different. Of the 20 qualified stations, 20 percent had effective discharge estimates that were less than the station's average mean daily discharge. Such low magnitude flow events are not usually associated with a stream's dominant discharge. Thus, geomorphic assessments and bankfull computations are required to further assess whether these and other effective discharge values are representative of the 20 individual streams' dominant discharges. Due to the small sample size, regression analyses relating specific effective discharge parameters to channel slope and watershed area were inconclusive. Effective discharge computations are particularly sensitive to how the sediment rating curve used in the computation is developed and the number of discharge classes used in the computation. The sampling frequency and duration over which the sediment samples used to create sediment rating curves also may influence effective discharge computations significantly. Thus, while stream restoration personnel will likely continue to use these and other effective discharge values as part of several tools in hydraulic and channel design applications, uncertainties in their use should be acknowledged and undue weight should not be assigned these values, as they cannot yet be expected to yield fully reliable results in applications. Like previous researchers, we recommend more comprehensive investigations that compare effective discharge estimates to bankfull discharges in combination with a geomorphic assessment of each stream's characteristics to yield a better understanding of whether currently computed effective discharge values adequately represent dominant discharges in Illinois. Suspended sediment represents the dominant sediment load in most Illinois streams. In some cases, effective discharge computations based on total loads or bed material loads may be more appropriate than using suspended sediment loads analyzed here. However, the bed load, bed material, bank material, local channel slope, and channel cross-section information required to perform these computations and analyses are almost nonexistent. While many of these data can be collected at selected stream locations, inherent difficulties in estimating bed loads in Illinois streams make this approach unfeasible. New technologies for sampling or estimating bed load most likely would need to be developed and tested. This analysis presents a comprehensive assessment of effective discharges based on the available suspended sediment and flow data in Illinois. Long-term sediment data sets are needed at more stream locations to more fully estimate and understand effective and dominant discharges in Illinois streams. The greatest need for additional data is for smaller watersheds less than approximately 200 mi2 because most potential applications of the effective discharge concept in stable channel design are for smaller watersheds. Smaller watersheds also may have significantly different geomorphic characteristics and effective discharges may behave differently than those in larger watersheds. The Illinois State Water Survey currently is measuring suspended sediment at gaging stations on 13 small watersheds, which could prove very useful in effective discharge analysis as longer data records become available at these sites. | | | | Date Created: | 9 24 2004 | | | | Agency ID: | CR-2002-10 | | | | ISL ID: | 000000000871 Original UID: 999999994348 FIRST WORD: Effective | |
| 222: | | Title: | | | | | Volume/Number: | 2002 January | | | | Issuing Agency: | | | | | Description: | Illinois Department of Revenue publication FY 2002-25 Expanded Temporary Storage Exemption, Informational Bulletin To: Illinois Retailers Effective January 1, 2002, a new exemption exists for certain sales of tangible personal property. As an Illinois retailer, you may sell tangible personal property tax-free to a purchaser that provides to you a written certification containing the following information: the expanded temporary storage permit number, which we have issued to the purchaser, and a statement that the property purchased will be temporarily stored in Illinois but subsequently will be transferred outside of Illinois for use or consumption solely outside the state. This exemption also covers property that will be processed, fabricated, manufactured into, attached to, or incorporated into other property as long as that property is temporarily stored in Illinois and used or consumed solely outside the state as described above. You may also accept a written certification from the purchaser that serves as a blanket certificate Expanded Temporary Storage. | | | | Date Created: | 01 2002 | | | | Agency ID: | FY 2002-25 | | | | ISL ID: | 000000001741 Original UID: 1685 FIRST WORD: Expanded | |
| 223: | | Title: | | | | | Volume/Number: | | | | | Issuing Agency: | | | | | Description: | Description of an Effective Practice in direct connection to Policy Area 5 of "The Illinois Commitment." | | | | Date Created: | | | | | Agency ID: | | | | | ISL ID: | 000000020335 Original UID: NA for serial records FIRST WORD: Effective | |
| 224: | | Title: | | | | | Volume/Number: | 2002 May | | | | Issuing Agency: | | | | | Description: | During the month of April, Illinois EPA sponsored and participated in various environmental events including Earth Day, Earth Awareness Fair, Earth Stewardship Day, and the Partners for Clean Air Breakfast. This show features interviews with those involved in the various proceedings. 10:08 | | | | Date Created: | 03 08 2012 | | | | Agency ID: | | | | | ISL ID: | 000000040470 Original UID: 20653 FIRST WORD: Earth | |
| 225: | | Title: | | | | | Volume/Number: | 2000 May | | | | Issuing Agency: | | | | | Description: | Earth Stewardship Day is a chance for 4th graders throughout Sangamon County to learn about the importance of the Earth's environment and resources. Held annually at the State Fairgrounds, students play games and listen to presenters from the sponsoring state agencies, as well as local and county groups. Students, teachers and event coordinators talk about the unique learning experience offered. 8:08 | | | | Date Created: | 03 08 2012 | | | | Agency ID: | | | | | ISL ID: | 000000040509 Original UID: 20672 FIRST WORD: Earth | |
| 226: | | Title: | | | | | Volume/Number: | 2012 February 23 | | | | Issuing Agency: | | | | | Description: | Effective February 27th, the Illinois Department of Veterans Affairs (IDVA) Veterans Service Office will move from its current location in Champaign back to its previous location at the Illinois National Guard Armory located at 600 East University in Urbana. | | | | Date Created: | 02 23 2012 | | | | Agency ID: | 148**12 | | | | ISL ID: | 000000041356 Original UID: 21215 FIRST WORD: Effective | |
| 227: | | Title: | | | | | Volume/Number: | 2012 April 11 | | | | Issuing Agency: | | | | | Description: | More than 875 students will visit Illinois Department of Natural Resources (IDNR) state parks in April and May for the sixth annual Earth Day in the Parks event. Earth Day in the Parks is an initiative of the IDNR to introduce students to environmental stewardship. | | | | Date Created: | 04 11 2012 | | | | Agency ID: | 358**12 | | | | ISL ID: | 000000042496 Original UID: 22078 FIRST WORD: Earth | |
| 228: | | Title: | | | | | Volume/Number: | 2012 June | | | | Issuing Agency: | | | | | Description: | Brochure about expanded use antique license plates. | | | | Date Created: | 06 11 2012 | | | | Agency ID: | VSD 845.1 | | | | ISL ID: | 000000043824 Original UID: 23324 FIRST WORD: Expanded | |
| 229: | | Title: | | | | | Volume/Number: | 2012 July 25 | | | | Issuing Agency: | | | | | Description: | Effective Tuesday, July 31st, the Illinois Department of Veterans Affairs (IDVA) Veterans Service Office in Blue Island will move to a new location in the Illinois Department of Human Services (DHS) office, which is located at 16845 South Halsted Street in Harvey, Ill. | | | | Date Created: | 07 25 2012 | | | | Agency ID: | 828**12 | | | | ISL ID: | 000000044556 Original UID: 24054 FIRST WORD: Effective | |
| 230: | | Title: | | | | | Volume/Number: | 2013 January | | | | Issuing Agency: | | | | | Description: | Brochure for the acquiring expanded-use licence plates for antique automobiles | | | | Date Created: | 06 11 2012 | | | | Agency ID: | VSD 845.1 | | | | ISL ID: | 000000045660 Original UID: 25216 FIRST WORD: Expanded | |
| 231: | | Title: | | | | | Volume/Number: | 2014 | | | | Issuing Agency: | | | | | Description: | Flyer showcasing the role of research in a more effective process for wetland mitigation sites | | | | Date Created: | 07-15-2014 | | | | Agency ID: | | | | | ISL ID: | 000000051854 Original UID: 172882 FIRST WORD: Effective | |
| 232: | | Title: | | | | | Volume/Number: | 2014 April 11 | | | | Issuing Agency: | | | | | Description: | Press Release: More than 750 students will visit Illinois Department of Natural Resources (IDNR) state parks in April and May for the eighth annual Earth Day in the Parks event series. Earth Day in the Parks is an initiative of the IDNR to introduce students to environmental stewardship. | | | | Date Created: | 04-11-2014 | | | | Agency ID: | 399**14 | | | | ISL ID: | 000000059010 Original UID: 180236 FIRST WORD: Earth | |
| 233: | | Title: | | | | | Volume/Number: | 2017 April 20 | | | | Issuing Agency: | | | | | Description: | Press Release: In recognition of Earth Day this weekend, the Illinois Department of Transportation will recognize 143 Adopt-A-Highway volunteer groups that have been keeping Illinois roadways clean for the past 20 years. | | | | Date Created: | 04-20-2017 | | | | Agency ID: | | | | | ISL ID: | 000000078701 Original UID: 192750 FIRST WORD: Earth | |
| 234: | | Title: | | | | | Volume/Number: | 2017 April 20 | | | | Issuing Agency: | | | | | Description: | Press Release: In recognition of Earth Day this weekend, the Illinois Department of Transportation is honoring the Adopt-A-Highway groups that have been keeping Illinois roadways clean since the program started more than 20 years. | | | | Date Created: | 04-20-2017 | | | | Agency ID: | | | | | ISL ID: | 000000078899 Original UID: 192866 FIRST WORD: Earth | |
| 235: | | Title: | | | | | Volume/Number: | 2017 April 19 | | | | Issuing Agency: | | | | | Description: | Press Release: In recognition of Earth Day this weekend, the Illinois Department of Transportation will recognize 143 Adopt-A-Highway volunteer groups that have been keeping Illinois roadways clean for the past 20 years by planting a redbud tree on the Hanley Building campus. | | | | Date Created: | 04-19-2017 | | | | Agency ID: | | | | | ISL ID: | 000000078900 Original UID: 192867 FIRST WORD: Earth | |
| 236: | | Title: | | | | | Volume/Number: | 2017 July 17 | | | | Issuing Agency: | | | | | Description: | Press Release: As part of the IDES modernization effort, starting on September 11, 2017, Illinois employers will be able to use MyTax Illinois to complete all their unemployment insurance (UI) tax processes. IDES is putting more features and functionality online to better serve all our employers needs. | | | | Date Created: | 08-28-2017 | | | | Agency ID: | | | | | ISL ID: | 000000080591 Original UID: 193368 FIRST WORD: Effective | |
| 237: | | Title: | | | | | Volume/Number: | 2018 April 20 | | | | Issuing Agency: | | | | | Description: | Press release: The Illinois Department of Public Health (IDPH), along with the Centers for Disease Control and Prevention, the Food and Drug Administration, and other state and local health departments, is expanding its investigation of a multi-state cluster of E. coli infections to include not only chopped romaine lettuce, but full heads and hearts of romaine lettuce. | | | | Date Created: | 04-20-2018 | | | | Agency ID: | | | | | ISL ID: | 000000081854 Original UID: 194459 FIRST WORD: Expanded | |
| 238: | | Title: | | | | | Volume/Number: | 2020 September | | | | Issuing Agency: | | | | | Description: | Illinois Department Of Revenue Bulletin Expanded Audit Fast Track Resolution (FTR) Program Now Available | | | | Date Created: | 09-08-2020 | | | | Agency ID: | | | | | ISL ID: | 000000084864 Original UID: 197401 FIRST WORD: Expanded | |
| 239: | | Title: | | | | | Volume/Number: | 2020 March 16 | | | | Issuing Agency: | | | | | Description: | Press Release: To further prevent the spread of COVID-19, and in accordance with theGubernatorial Disaster Proclamation issued on March 9, 2020, the Illinois Department of NaturalResources (IDNR) today announced the closure of all state parks, fish and wildlife areas, recreational areas, and historic sites as well as the cancellation of upcoming scheduled events. | | | | Date Created: | 03-16-2020 | | | | Agency ID: | | | | | ISL ID: | 000000088083 Original UID: 199072 FIRST WORD: Effective | |
| 240: | | Title: | | | | | Volume/Number: | 2021 April 13 | | | | Issuing Agency: | | | | | Description: | Press Release: Hundreds of students and scouts will visit Illinois Department of Natural Resources (IDNR) state parks this spring to get their hands dirty and learn about natural areas stewardship as part of the annual Earth Day in the Parks event series | | | | Date Created: | 04-13-2021 | | | | Agency ID: | | | | | ISL ID: | 000000090126 Original UID: 201277 FIRST WORD: Earth | |
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