City Council Planning Sessions

1. City Council Planning Agenda Documents: 2015-05-11 CITY COUNCIL PLANNING AGENDA.PDF 2. City Council Planning Minutes Documents: 2015-05-11 CITY COUNCIL PLANNING MINUTES.PDF 3. City Council Planning Draft 2015-04-27 Minutes Ps02 Documents: 2015-05-11 CITY COUNCIL PLANNING DRAFT 2015-04-27 MINUTES PS02.PDF 4. City Council Planning Briarcliffe Lakes Flood Study Ps03 Documents: 2015-05-11 CITY COUNCIL PLANNING BRIARCLIFFE LAKES FLOOD STUDY PS03.PDF  WHEATON CITY COUNCIL PLANNING SESSION WHEATON CITY HALL – COUNCIL CHAMBERS 303 W. WESLEY STREET, WHEATON, ILLINOIS MONDAY, MAY 11, 2015 - 7:00 P.M. AGENDA I. Call to Order II. Approval of Minutes – April 27, 2015 III. Briarcliffe Lakes Flood Study IV. Public Comment V. City Council/Staff Comments VI. Adjournment During the Public Comment portion of the agenda, the presiding officer shall recognize any person requesting to be heard on any of the planning session agenda items only. Persons speaking during Public Comment shall not speak longer than three (3) minutes and shall be permitted to speak only once. Visitors must remain quiet and not engage in behavior that interferes with the Planning Session. The presiding officer may, or upon a majority vote of the council, request any visitor who violates any provision of this paragraph to leave the council chambers, and such visitor shall thereupon leave. Any person providing public comment shall address the presiding officer only and shall not proceed with remarks until recognized. When recognized, the person shall state his or her name and address. Cross floor discussions are prohibited. If a member of the City Council has questions of any person who has provided public comment, that person may address the specific question.  MEMORANDUM TO: Record FROM: Susan Bishel, Public Relations Coordinator SUBJECT: May 11, 2015 City Council Planning Session Minutes DATE: May 12, 2015 CC: Mayor and City Council, City Manager, City Clerk, Department Heads The Planning Session took place in the Council Chambers, Wheaton City Hall, 303 W. Wesley St., Wheaton, Illinois. Those attending the Planning Session included: Mayor Gresk, Councilwoman Fitch, Councilman Prendiville, Councilman Rutledge, Councilman Saline, Councilman Scalzo and Councilman Suess. Also in attendance were City Manager Rose, Assistant City Manager Dzugan, Director of Engineering Redman, Stormwater Engineer Tebrugge and Public Relations Coordinator Bishel. The session began at 7:01 p.m. and concluded at 8:57 p.m. The following items were discussed: I. Call to Order The Wheaton City Council Planning Session was called to order at 7:01 p.m. by Mayor Gresk. II. Approval of April 27, 2015 Planning Session Minutes The Council approved the April 27, 2015 Planning Session Minutes. III. Briarcliffe Lakes Flood Study City Manager Rose introduced Erik Gil of Christopher B. Burke Engineering, who oversaw the City’s Briarcliffe Lakes Flood Study. The City hired the engineering firm after a rain event in April 2013 caused flooding in more than 40 homes located near the Briarcliffe Lakes System. The study focused on the Briarcliffe Lakes system and surrounding area, bounded by the Williston Basin to the north and Butterfield Road to the south. Mr. Gil reviewed a map with the locations of the lakes, the shape of the watershed and showed how the watershed feeds into Rice Lake. The study used the City’s historical flooding information, GIS database, previous field investigations by City staff, a storm sewer system study, aerial topography, rainfall information, storm sewer information and flood storage information to create computer modeling showing what is likely to happen during peak storm events of varying severities. Mr. Gil summarized how several factors affect flooding, including the rate of rainfall, storm duration and ground saturation. He illustrated how several of these factors led to flooding conditions consistent with a 100-year event in April 2013, including significant rainfall over a short amount of time, when the ground was already well-saturated from previous rain. Mr. Gil showed maps of the area’s storm sewers and explained what happens when water begins overtopping the berm. This includes Lakes 1 and 2, which are hydraulically connected with Lakes 3 and 4. The study also surveyed 52 homes in the Briarcliffe area that have experienced flooding. Mr. Gil outlined six options the consultant explored as possible methods to reduce flooding, along with the costs and anticipated impact on flood reduction. • Alternative 1 involved excavating Briar Patch Park approximately 10 feet and adding a 48-inch storm sewer with a direct connection to Lake 3. Modeling showed this project would not remove overland flooding for any homes. The cost is estimated to be $6.9 million. • Alternative 2 would restore the southern berm of Lake 4 to its original height. Modeling showed this project would not remove overland flooding for any homes, and the project is estimated to cost $380,000. • Alternative 3 would install a new 42-inch storm sewer from Lake 3 to downstream of Nottingham Lane. Modeling showed this project would not remove overland flooding for any homes, and the project is estimated to cost $3.46 million. • Alternative 4 would install a new 3.5-foot-by-10-foot reinforced concrete box culvert conveyance pipe from the low point at Brentwood and Cheshire that would convey water to Windsor Channel. This project is estimated to eliminate flooding in the 100-year critical storm event in 42 out of the 43 homes. The project is estimated to cost $10.43 million. This project would create more flow to Windsor Channel and ultimately Rice Lake, so the Forest Preserve District would need to approve the project. • Alternative 5 would combine Alternative 1 and Alternative 4 to increase flood storage and conveyance of the Briarcliffe Lake System Area. It would cost approximately $17 million with no additional flooding reduction benefits, but it is an option the City could consider if more flood mitigation is necessary. • Alternative 6 involved voluntary buyouts of all of the homes affected by overland flooding in the 100-year critical storm event. The cost would be approximately $14.7 million, with costs estimates generated from DuPage County’s property value estimates plus the estimated cost of demolition. Mr. Gil stated based on these study results, his firm recommends Alternative 4, however, this plan will require coordination with the DuPage Forest Preserve and further modeling to determine the effect on Rice Lake and the Windsor Channel. Stormwater Engineer Tebrugge displayed diagrams combining data from the flood study, showing the extent of flooding under certain situations. He stated that the modeling completed with the Alternative 4 work showed only one home would still receive overland flooding, which was a home with a very low entry elevation point because of its walkout basement. Stormwater Engineer Tebrugge reviewed grant funding options for which the City may be eligible, including a Department of Housing and Urban Development Community Development Block Grant for which DuPage County was invited to apply. The City’s project would as part of the area DuPage County is targeting in its application, however DuPage County will decide which projects to include in its application for grant funding. Another possible grant opportunity is FEMA’s Hazard Mitigation Grant Program, a competitive grant through which communities that submit the most cost-effective projects could be awarded federal grant funding. 5/11/15 Planning Session 2 Stormwater Engineer Tebrugge summarized the current stormwater program objectives, which are to create a successful, equitable and cost-effective stormwater improvement program. He reviewed the steps the City is taking to achieve this, including performing hydraulic studies, obtaining alternative analysis, performing the benefit cost analysis, ranking flood protection projects based on benefit cost analysis, exploring outside funding options, and constructing flood protection projects. He stated City staff’s recommendation is to continue flood studies of flood-prone areas and floodplain areas, perform a Briarcliffe Flood Study follow-up, and continue with stormwater policy development. In response to Council questions, Stormwater Engineer Tebrugge stated if Alternative 4 were completed, he expects that Rice Lake would increase in capacity by approximately 0.3 feet of water. While the City anticipates Rice Lake could handle the additional water sent downstream, the City would need to further analyze the impact that it would have. IV. Public Comment Bernard Meyers, 1770 Brentwood Lane, asked if the City knew the total public and private costs associated with the April 2013 flooding. He also inquired whether work done to reduce flooding to the 50-year storm level would be less costly and if this is an option the City has considered. Stormwater Engineer Tebrugge stated the City does not have a total for damages from the 2013 storm, but FEMA calculates this based on all of the required information in the application process. He stated making improvements to reduce the risk of flooding during a lesser storm would not create a significant savings for the City compared to reducing flooding to the 100-year level. Gary Burge, 1733 Brentwood Lane, asked whether the City has considered targeted buyouts of some homes in the flood-prone area and turning this area into a retention basin. Stormwater Engineer Tebrugge stated the City would need much more storage than a retention basin in the current area could provide, so this would not significantly reduce flooding. Mr. Gil stated FEMA does not allow for targeted buyouts due to a lack of equity in buying back some homes and not others, so the City would not be eligible for FEMA grant funding. Peggy Rasmussen, 1879 Briarcliffe Boulevard, asked how the proposed infrastructure of Alternative 4 would be enough to carry the amount of water away necessary to reduce flooding. She also asked how much the berm has settled and how the report estimated property values. She asked about the timeline the City anticipates seeing any progress made. Mr. Gil stated because of the size of the proposed box, it would siphon water off and reduce it. He stated the berm has settled approximately 6 inches, which may need to be addressed, but the City does not own the berm. He stated the property values were estimated using DuPage County’s data, but these are concept-level estimates; if applying for grant funding, the City would have each property appraised. 5/11/15 Planning Session 3 Stormwater Engineer Tebrugge stated the City estimates the current studies would be done in the next two years, however the FEMA grant process could be more lengthy. Kevin Culum, 1775 Brentwood Lane, suggested the City have discussions with the Village of Lisle to see what their recommendations are and what their experience with buyouts has been. He stated he has attended DuPage County meetings in regard to flooding and wanted to know what the City could do to expedite possible grant funding from DuPage County. Stormwater Engineer Tebrugge stated the grant funding for which DuPage County is applying is through the Department of Housing and Urban Development. Because it’s a national competition, there are many participants competing for the same funding. Stormwater Engineer Tebrugge clarified that there are several sources through which DuPage County is hoping to receive disbursements, including the Department of Housing and Urban Development grants. Crystal Nesson, 1845 Brentwood Lane, asked whether the Village of Glen Ellyn and College of DuPage have cooperated in this study process, as a substantial portion of the water draining into the subdivision’s Lakes system comes from Glen Ellyn and College of DuPage property. Stormwater Engineer Tebrugge stated the City of Wheaton completed this study independently of Glen Ellyn and College of DuPage. Norm Retzke, 1733 Harrow Court, asked what would need to be done to raise the berm and whether it would require cooperation with Glen Ellyn or College of DuPage. Director of Engineering Redman stated the City has not yet explored all of the issues related to raising the berm, as raising it would not have much of an effect on flooding. The State of Illinois may require it to be raised, but it may be the responsibility of the homeowners association. Shamili Ajgaonkar, 1663 Brentwood Lane, stated she has attended the DuPage County meetings regarding flooding, and her concern is that DuPage County is seeking grant funding mostly for projects that focus on green infrastructure. She wondered if the City’s projects would not be chosen by DuPage County because they do not focus on green infrastructure. Stormwater Engineer Tebrugge stated the City did not consider making this a green infrastructure project because of the severity of flooding, however the grant DuPage County is seeking is a broad program aimed at projects that make a community more resilient. He stated DuPage County is considering a variety of projects, and not all are green infrastructure projects. Donna Vitalo, 1891 Doncaster, wondered if the City would be looking at projects to address localized flooding, such as the puddles that form in her yard during every significant rainfall. Stormwater Engineer Tebrugge stated the Sewer Division could take a look at the storm sewers near her property to see if they are functioning properly. 5/11/15 Planning Session 4 Dustin Scharf, 1755 Brentwood Lane, stated his property is at the lowest elevation on Brentwood. He asked if the City was going to be reducing flooding so that properties like his would not flood in lower-level events. He asked if raising the berm would help in the short term. Stormwater Engineer Tebrugge stated raising the berm would not help with flooding in the short term, and he clarified that if larger pipes were installed, these would help with lesser rainfall events as well as 100-year events. Alan Varney, 1585 Brentwood Lane, asked whether the larger drain installed off of Woodcroft Drive in an unincorporated area would have any effect on the amount of stormwater west of Woodcroft. Stormwater Engineer Tebrugge stated he is unaware of any new work done here but stated the City will look into it, as it should have received permits through DuPage County. In response to Council questions, Stormwater Engineer Tebrugge stated the level of silt in the Briarcliffe Lakes is not relevant, because it is not taking up any flood storage volume; the circumstances here are not like the previous state of Northside Park, which had a great deal of silt and a creek without any specific storage limits. In response to Council questions, Mr. Gil stated altering or draining down Briarcliffe Lakes before a storm would have little effect on flooding because there is not enough room in the watershed for storage. In response to Council questions about the condition of storm sewers in the study area, Director of Engineering Redman stated the City recently performed work in this area through the annual road program, and any defective storm sewers would have been fixed during this work. In response to Council questions, Mr. Gil stated he does not anticipate that DuPage County would remap the study area’s floodplain maps in the next few years. Stormwater Engineer Tebrugge stated the next steps would be for the Council to decide whether to move forward with additional analysis needed in order to apply for the FEMA grant. City Manager Rose stated it would be in the City’s best interest to move forward with the analysis, and it would make the most sense to have the current engineering contractor continue with this work, as they already have gathered a large amount of data. The next step would be performing further modeling to determine the downstream impact on Rice Lake and the Windsor Channel and then individual home analysis to collect the data for completion of the Benefit Cost Analysis. V. City Council/Staff Comments There were no City Council/Staff comments. 5/11/15 Planning Session 5 VI. Adjournment The meeting was adjourned at 8:57 p.m. 5/11/15 Planning Session 6  MEMORANDUM TO: Record FROM: Susan Bishel, Public Relations Coordinator SUBJECT: April 27, 2015 City Council Planning Session Minutes DATE: April 28, 2015 CC: Mayor and City Council, City Manager, City Clerk, Department Heads The Planning Session took place in the Council Chambers, Wheaton City Hall, 303 W. Wesley St., Wheaton, Illinois. Those attending the Planning Sessiofl iRjded: Mayor Gresk, Councilwoman Corry, Councilman Prendiville, Councilm$bdge, Councilman Saline, Councilman Scalzo and Councilman Suess. Also in atteañce were City Manager Rose, Assistant City Manager Dzugan, Director of EngineeriRedman, Sewer Superintendent Jankovic, Project Engineer Peacock and Public ions Coordinator Bishel. The session began at 7 p.m. and concluded at 8:57 p.m. T owing items were cflscussed: l.CalltoOrder The Wheaton City Council Planning S ssion was r at 7:00 p.m. bMayor Gresk. II. Approval of April 13, 2015 The Council approved the April13, Ill. Electric Car ChargngStaton. . City Manager Rose stated as part of a Green Actlé’n Plan thetpvironmental Improvement Commission submittedearIier in the ear, the coimission recommended the City fund an electric car charging stati’b1 for Mu:, arkint4-ot 1 at an estimated cost of $11,000. City Manager Rose statefl City staff ommends again’st this proposal based on their belief that the City showlcV not be taking on nerograms at iffistirrie, especially in light of possible cuts to state shared revenue. He eressèd concerns about the amount of staff time that would be required, maintenance cost i,d phiro”spphical questions that would arise if the City provided this service free of charge. In addition, with the low number of electric cars registered in Wheaton, City Manager Rose questioned the demand for a charging station. Council members commended the Environmental Improvement Commission for encouraging the use of alternative fuels and for their programs that support the local environment. However, Council members did not think this should be a City-supported program at this time. Environmental Improvement Commission Member Ted Witte addressed the Council, stating that this plan was an update to the commission’s 2008 Green Action Plan. He thanked the City Council for accommodating all of the other requests in the updated plan and for their consideration of an electric charging station. IV. Housing Commission Purpose Statement City Manager Rose stated the City’s Housing Commission is seeking to amend its purpose statement in the City Code in order to increase the group’s ability to serve residents. City Manager Rose questioned whether the commission’s expanded activities would require additional staff time and sought additional information from the Commission on the matter. The Commission indicated that staff assistance would not be needed. Tom Hudock, Housing Commission Chairman, stated through the commission’s outreach for the Senior Housing Program, they have become aware of other needs within the growing senior population in DuPage County. The commission would like to broaden its mission in order to explore additional ways to assist Wheaton residents in need. In response to Council questions, Mr. Hudock stated the corPPnission does not anticipate needing any additional City staff time or funding. He state. they would like to find ways to connect residents with services or solutions available through other entities. Some Council members expressed concern thaWliie commission may create unrealistic expectations from people needing assistance if their purpose is Council members stated expanding the commission’s purpoe statement is a minor request that requires no funding; the commission is simply seeking peission to look beyond their current scope to explore needs within the community. The majoritof the Council expresed interest in considering the requested amendmeritto the City Code. V. Review of Sanitary Sewer Report City Manager Rose stated the City conducted a pilot program to assess the effectiveness of a different approach to taking clear water out of the sanitary sewer as a way to minimize sanitary sewer backups and overland flows. RJN Group prepared a report summarizing the findings of this program, known as the Basin 4 Pilot Study. Karol Gioii€, Group, stated the City began this program as part of its infrastruUre goal of red&èing ba ent backups and overflows. In studying Basin 4, which is the northést part of the city,.RJN wIçed with staff to identify the portion of Basin 4 that would be included in the Pilot Program. Gioka stated their recommended course of action to reach the City’s goal ofa 40 percent reduction in flow was to rehabilitate public portions of the system and perform selected private sbr work, including lining some laterals and identifying and removing illegal connections t9.he system. The work included rehabilitation of 38 manholes, removing 11 illegal sump:connections (18 additional connections have been identified but have not yet been removeF),and lining 160 laterals. Giokas stated flow monitoring was done before and after the pilot area rehabilitation, with an estimated pilot area flow reduction of 31 percent. She stated some of the rehabilitation, such as removing the additional illegal connections, had not yet been done, which RJN believes accounts for the flow reduction not quite reaching the 40 percent goal. Giokas showed photos from dye testing before and after lateral lining, showing an example of how lining the lateral kept dyed water from infiltrating the sewer at the main. 4/27/15 Planning Session 2 She summarized challenges that arose in working on private property. City staff and contracted crews spent a great deal of time dealing with private property issues, mainly related to installing cleanouts and locating laterals near homes. Because of this, Giokas stated for a second pilot project, RJN is suggesting the City line laterals up to the property line, which would eliminate the need to perform work on private property. In response to Council questions about the effectiveness of lining laterals to the property line, Assistant City Manager Dzugan stated staff expects similar results, as in the first pilot, only 36 percent of the homes’ laterals were lined. In the second pilot, the City is proposing lining all of the laterals in the pilot area from the main to the property line. Director of Engineering Redman stated crews found the most problems with laterals near th[onnection to the sewer main, so they expect lining this portion would have the greatest impin reducing flow. Assistant City Manager Dzugan stated staff is striving to find a balance in reducing flow in the most cost- effective way. In response to Council questions, Director of Engineering Redman statej&leanouts are only required when the lateral is lined over a longer ditäce. Giokas reviewed the capacity levels in the Wheaton i bistrict’s southside interceptor, Sanitdi 4 which is where Basin 4 empties. She discued how the Wheaton Sanitary District’s capital improvements increased the southsideinteràéptàr’s capacit’,.but as part of an overall improvement plan, the City also agreed to reduce1. Giokas reviewed the it Its of rinced mIii1n Basin 4 nd the probability of backups in various conditions. ThiTipdel corIsions showd that undersized sewers create hydraulic restrictions, and the Cityot rch its goals oreduced backups without additional capacity. This can e accomplished Th larger sewers or prallel sewers. RJN recommends the City continue th flow red on in the public sector, wit’ private sector rehabilitation and enforcenent, and throLi Ieral lining options. RJN also recommends Wheaton begin capital improvement preliminary dsigns and continue to monitor flow. Giokas reviewed a recommended overall scheduIeof flow reduction and capital improvement work to be done between now and2023, which includes working on flow reduction measures from the north to the south, and capitI improvement work from the south to the north. Assistant City Manager Dzi4i summarized City staff’s recommendation to begin a second pilot program including lateral lining and defining a plan for phased capital improvements. In response to Council questions, Director of Engineering Redman stated the cost per property for lateral lining was approximately $6,500, and this lining has a life expectancy of 50 to 100 years. Overhead sewers cost approximately $6,000 per property to install. In response to Council questions, Director of Engineering Redman stated the 2006 study identified three priority areas (basins) within the City with the greatest needs for sanitary sewer 4/27/15 Planning Session 3 improvement. The City is first targeting these areas, but the same process won’t necessarily need to be carried out citywide because not all areas have the same needs. Mike Young of RJN answered Council questions by stating construction as part of the capital improvements could begin next year. City Manager Rose stated the City will also be looking at sewer rates and working to develop a long-term rate structure to support capital improvements. This study would be performed by an outside consultant. VI. Public Comment There were no public comments VII. City Council/Staff Comments / Councilman Rutledge noted that this is Liz Corry’s last meeting serving as an interim City Council representative He thanked her for her service on the Council IV. Adjournment The meeting was adjourned at 8:57 p.m. 4/27/15 Planning Session 4  MEMORANDUM TO: The Honorable Mayor and City Council FROM: Joseph E. Tebrugge, Stormwater Engineer DATE: May7, 2015 SUBJECT: Briarcliffe Lakes System Flood Study Overview OBJECTIVE Review and summarize the Briarcliffe Lakes System Flood Study prepared by Christopher B. Burke Engineering, Ltd which is a hydraulic study of the tributary area to the Flood Prone Area “Brentwood Lane east of Briarcliffe Boulevard”. BACKGROUND Strategic Goal Strategic Goal 3, Efficient and Effective Services, Key Performance Indicator D, — provides that an understanding of the contributing variables causing overland flooding during various rain events of principle structures in flood prone and flood plain areas be completed by April 2017. On April 18, 2013 a major storm event occurred over the City of Wheaton. Many areas throughout the City were flooded including the Flood Prone Area Brentwood Lane east of Briarcliffe Boulevard. During the storm the system of Lakes north of Brentwood Lane all filled to capacity and then floodwaters poured over the southern berm of Lake Four flooding a large residential area, disrupting residents lives, and causing property damage and loss. The flooding that occurred is not an isolated incidence. Based on the City’s records and best available information the berm has overtopped seven times in the last forty-five years. In response to the flooding and in conjunction with Strategic Goal 3D the City Council approved the Briarcliffe Lakes System Flood Study to analyze and document the flooding conditions of this Flood Prone Area as well as propose possible mitigation options. FLOOD STUDY PROCESS A hydraulic model was created for the entire watershed which begins north of Roosevelt Road with the already studied Williston Basin Tributary Area and is generally bounded by Naperville Road to the west, Lambert Road to the east, and Butterfield Road to the south. (A map of the watershed can be found in the Flood Study on page iv.) - The framework for the model begins by surveying all pertinent storm sewers, roads, detention basins, ponds, overflow areas, and all other flow paths along the flood water’s route through the watershed to document how the water flows through the watershed. This data was then entered into the hydraulic model. Additionally high water marks of the April 2013 storm event, depicted in photographs taken by residents and Staff were surveyed to determine the height and breadth of the flood waters. The required survey for the hydraulic model included surveying Lake A, Lake 1, Lake 2, Lake 3, and Lake 4 aiding in furthering Strategic Goal 2C, the identification and documentation of existing storm water storage areas. Calibration - Next rainfall data from the April 18, 2013 storm was run through the hydraulic model and the estimated high water levels were compared to real water levels that occurred during the storm. The model then went through a long series of minor changes or tweaks to ensure that the computer model was calibrated properly to output estimated flooding that matched the flooding that occurred in the April 18, 2013 storm. Hydraulic Model Simulation With a properly functioning hydraulic model a large series of simulated rainfall events are run through the model to determine what duration is the “critical storm” also known as the duration of storm event that causes the worst flooding for a specific area. The watershed is so large that different areas in the watershed happen to have different critical storm durations (Flood Study page 13) with the 48 hour storm duration being critical for Brentwood Lane east of Briarcliffe. After knowing the critical storm duration, the differing storm frequencies (5, 10, 25, 50, 100, & 500 year storms) can be modeled to know the true flood risk during the worse case storm for the area. FLOOD RESULTS • The resulting 100 year critical High Water Level (HWL) of the flood prone area is between 746.42-746.00. • The maximum depth of the flooding is 5.61 feet in the 100 year critical storm event. • 43 homes will experience overland flooding into the structure in the 100 year critical storm event. • 30 of the 43 homes will receive overland flooding over the top of their foundation in the 100 year critical storm event. 9 11 of the 43 homes will receive overland flooding on the first floor in the 100 year critical storm event. MGA1iON OPTIONS EXPLORED The Briarcliffe Lakes System Flood Study explored many mitigation options and five mitigation alternatives were included in the report. Alternative 1 Briar Patch Park Storage — Convert Briar Patch Park from a Park District owned park which does not currently flood located at the intersection of Briarcliffe Boulevard and 22 Street into a pond. This pond would be able to provide an additional 26 acre-feet of storage in the watershed. The effect of this project in the 100 year critical storm on flood elevations was very small and would only lower the High Water Level (HWL) by 1.2 inches. This project would remove overland flooding from no homes. The cost for this project is estimated at $6.90 Million. Alternative 2 Berm Restoration — Restore the southern berm of Lake 4 to the historical design freeboard elevation of 746.00. The original design HWL of Lake 4 was 745.30. After a long series of events the final berm elevation along the COD owned portion of the berm was set to be 746.00. The existing survey shows that the lowest point on the current berm is at elevation 745.35 and is an isolated twenty foot long area in the 1350 foot long berm. A total of 437 feet of the berm is below the 746.00 elevation. The entire berm is above the original design HWL and as such the lake still holds to the regulatory elevation. The effect of this project in the 100 year critical storm on flood elevations was zero and as such removes no overland flooding from any structure. The cost for this project is estimated at $380,000. This cost does not take into account any additional work that may arise from IDNR-OWR classifying the berm as a dam after the flood event. Alternative 3 42” Sewer from Lake 3 to Nottingham — Install a new 42” storm sewer from Lake 3 to downstream of Nottingham Lane. During the hydraulic modeling it was found that the storm sewer downstream of Nottingham Lane is not filled to capacity during flood events. The proposed project was to increase the flow to this storm sewer to ensure that it is flowing at maximum capacity. The effect of this project in the 100 year critical storm on flood elevations was zero and as such removes no overland flooding from any structure. The cost of this project is estimated at $3.46 Million. Alternative 4— Box Culvert from Brentwood to Windsor Channel Install a new 3.5’ x 10’ reinforced concrete box culvert conveyance pipe from the low point at Brentwood and Cheshire, south along Cheshire to Windsor Drive, and west along Windsor Drive to Windsor Channel where the box culvert increases in size to 4’xlO’ and replaces an existing pipe. This project decreases the flooding of the entire area between Lake 3 to southwest of Sussex Lane. The decrease in flood elevation varies depending on the location but the decrease in flood elevation at Brentwood Lane and Cheshire is 5.5 feet. This project eliminates overland flooding in the 100 year critical event in 42 out of the 43 homes. The cost of this project is estimated at $10.43 Million. The project, however, also increases the flood elevation in Windsor Channel by 0.3 feet which is above the regulatory allowed level of 0.1 feet. Although there is an increase in flood elevation, the water never is modeled as able to leave the bounds of the channel. However in order for the project to be permitted through the DuPage County Stormwater Ordinance additional work would have to be done. Currently the downstream limit of the study was the north face of Butterfield Road. Additional study would have to be performed to determine if the proposed project would have a negative effect on flood elevations in Rice Lake and any additional downstream properties. Once the full effect of the negative conditions is determined, additional work to compensate for the increase in flood elevations may be necessary. The current level of Engineering done is also preliminary and as such additional conflicts found during final Engineering and/or construction are not reflected in the current estimation.  Alternative 5 Combine Alternatives One and Four — Combine Alternatives 1 and 4 to increase the flood storage and conveyance of the Briarcliffe Lake System Area. The additional effect on flood elevation when compared to Alternative 4 is generally an additional 1.3 inches. The project still eliminates overland flooding in the 100 year critical event in 42 out of the 43 homes. The cost for this project is estimated at $17.23 Million. Alternative 6 Buyouts - Buyout and demolish all of the homes effected by overland flooding in the 100 year critical storm event. This alternative was provided in part as a baseline and had no regard to whether a structure had any other structural flood protection possibilities such as elevating foundations, removing low entry points, elevating window wells, etc. The estimated cost to buyout and demolish the 43 effected homes was $14.69 Million. Of the mitigation options reviewed, the recommended mitigation alternative in the Briarcliffe Lakes System Flood Study was Alternative 4. A diagram of the properties currently affected and a diagram of the properties affected after the construction of Alternative 4 is attached at the end of this memorandum.  CURRENT GRANT FUNDING OPTIONS The Briarcliffe Lakes System Flood Study provided a hydraulic model that determined the extent of the flooding in the flood prone area Brentwood Lane east of Briarcliffe Boulevard. The study also went one step further in comparison to the two previous studies (Cherry Street & Williston Basin) and also provided a mitigation alternative analysis. However, as in any major stormwater improvement plan, a major hurdle is how to fund any proposed improvement. There are currently two known possible grant options available to help in the construction of a stormwater flood protection project for this area. 1) Department of Housing and Urban Development — Community Development Block Grant (CDBG) — National Disaster Resilience Competition (NDRC). The NDRC is a competitive grant which DuPage County has been invited to be a participant in. Through NDRC, HUD is awarding up to $1 billion for projects that demonstrate innovative and broad resiliency strategies in areas that still have unmet needs from the April 2013 flood. DuPage County has identified the East Branch DuPage River Watershed as one that meets the criteria for this opportunity and this area is tributary to the East Branch. Additionally since the NDRC is a CDBG it is a requirement that 50% of all funding be used in low to moderate income areas. According to the latest HUD low/mod income map the flood prone area Brentwood Lane east of Briarcliffe Boulevard is a low/mod income area which could aid in the selection of a project in this area by DuPage County. The City of Wheaton is an active partner of DuPage County in this endeavor, but not a decision making partner in the process. As such this funding option is reliant on other governmental entities for action. 2) FEMA Hazard Mitigation Grant Program (HGMP). All FEMA grant programs require a benefit cost analysis created by FEMA’s Benefit Cost Analysis Software. In order to perform the Benefit Cost Analysis (BCA) documented flood elevations and known elevations of specific structure data from the effected homes are necessary. The Briarcliffe Lakes System Flood Study provides the hydraulic study which determines the flood elevations and well as part of the structure data from the affected homes. However additional structure information is needed from all of the affected homes to be able to perform the BCA. The needed information is the elevation of the lowest floor of the home, the square footage of the basement, as well as the square footage of any finished basement area. Only once this information is collected can a grant application be prepared and submitted to try to obtain funding. Funding is only available if the BCA is above 1 meaning it is cost effective. Grants submitted to FEMA from all entities are competitive with each other with preference given to the highest BCA.  CURRENT STORMWATER PROGRAM OBJECTIVES The creation of a successful, equitable, and cost effective Stormwater Improvement Program is a methodical, step by step process. Below is a summary of the framework that is currently being worked towards. 1) Perform Hydraulic Studies: The hydraulic studies and surveying is the required data to even begin the process. This is currently being funded at $600,000 over the next two years to complete the needed information in the remaining seventeen flood prone areas and all floodplain properties. All areas are being examined at the critical 100 year storm event to ensure fairness and equality between locations. 2) Obtain Alternative Analysis: An alternative analysis has been completed for the flood prone area Brentwood Lane east of Briarcliffe Blvd only. An alternative analysis for each of the seventeen remaining flood prone areas will be included in the hydraulic studies completed in the next two years. Already completed studies will be revisited to complete the alternative analysis. 3) Perform the Benefit Cost Analysis: As hydraulic studies are being completed and affected structures determined, Staff will gather the needed information from the hydraulic study and create the BCA. It is preferred that the BCA be performed by Staff rather than consulting engineering firms. In this way is ensured that each area is entered into the BCA software in the exact same way thereby creating a consistent BCA generation between all areas. 4) Rank Flood Protection Projects based on BCA: The point of flood protection projects is to remove damage that occurs during flood events. Ranking projects that remove the most damage from the community for the least amount of money first provides a sound and cost effective structure to evaluate flood protection. It also provides a clear, data driven format as to where it is best to spend monies first. 5) Explore outside funding options: Once flood protection projects are ranked and the City is prepared to proceed with projects outside funding sources will be explored. FEMA grant applications are generally available for any cost effective project throughout the City. There are other funding options that may only be available for projects in certain watersheds or certain economic zones and be much more sporadic in nature. Frequently the application window for funding is small and projects generally need to be “shovel ready” to even be able to apply. At this point having projects ready will prepare the City to be able to vastly increase the cost effectiveness of the stormwater program by obtaining funding from outside sources as they become available. Additionally if outside funding is available for only one area it could have an effect on the flood protection project ranking as the cost to the City would decrease. 6) Construct Flood Protection Projects: Finally when all due diligence has been done to explore the existing conditions, the best flood protection projects determined, and outside funding explored can projects be constructed. RECCOM MENDED AC11ON 1) Continue Flood Studies of Flood Prone Areas and Floodplain Areas (2 to 3 year time frame) Continue to work towards achieving Strategic Goal 3, Efficient and Effective Services, Key Performance Indicator D, provide an understanding of the contributing variables causing overland flooding during various rain events of principle structures in flood prone and flood plain areas. As provided for in the 2015/16 Budget, continue to manage consultant work gathering data and developing flood studies for the identified flood prone areas. Once completed, turn attention to data gathering of properties within established floodplain areas. 2) Briarcliffe Flood Study Follow-up (1 year time frame) — Should the City Council desire to move forward with the Study’s recommendation, the staff would recommend the following: a. Select and contract with an engineering consultant to study any possible downstream impacts to Windsor Channel and/or Rice Lake, provide preliminary engineering, and develop cost estimates for the project(s). b. Select and contract with an engineering consultant to collect data from single family homes that is required to complete the Cost Benefit Analysis (Homeowner cooperation will be necessary.) c. Staff input collected Cost Benefit Analysis data into FEMA software. d. Communicate with DuPage County on funding opportunities. e. Communicate with Forest Preserve once study is completed. 3) Stormwater Policy Development (2 year time frame) — Continue stormwater research, and policy analysis and preparation on the following: a. Review revenue options for funding stormwater improvement programs and projects. b. Review types of projects that would be permissible; establish metrics to evaluate potential projects. c. Review creating minimum Benefit Cost Analysis ratio in an effort to define funding priorities.  _____ ____ ___ / yL ‘bRIARcLIFFE LAKES SYSTEM FLOOD STUDY RESULTS J’ 1 10 ?- FkdLmits CRITICAL STORM FREQUENCY WHEN HOMES 2 i FI:d i mts . CURRENTLY RECIEVE OVERLAND FLOODING OVER J H, 3 Fbc L mts THETOPOFFOUNDATION :: : :‘:: c THE \\N. CT : ‘-‘ s1 • / i HOMES CURRENyLyAp-j-Q BY OVERLAND FLOODiNG IN THE 100 YEARCRITICAL STORM - 807( }\ /A 4:$ ‘2 I so I - JL ) \ 11 ‘ - - 1O\ - -. - ,< - -- 113 ‘• - — 2 - . .: .‘ - - %fI :rii--r I - - =65 . • \ . - 742 - - . 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