Bee Branch Restoration Alignment Study

Transcription

1 Bee Branch Restoration Alignment Study Bee Branch Citizen Advisory Committee (BBCAC) Meeting # 3 January 29, 2004 Meeting Agenda Introduction Review and Screening of Expanded Options Elimination of Infeasible or Unacceptable Options Formulation of Preliminary Alternatives Possible Open Channel Alignments Confirmation of Evaluation Criteria Evaluation Criteria Measuring Scales

2 Meeting Objectives Eliminate infeasible or unacceptable options through discussion of the option fact sheets Formulate preliminary alternatives from the feasible options Conduct exercise to explore potential open channel alignments Confirm prioritized evaluation criteria Discuss measuring scales for each of the evaluation criteria (if time permits) Review and Screening of Expanded Options Review Options from Meeting 2 Review and discuss fact sheets Discuss Screening Criteria (Boards)

3 Options Kept in Meeting 2 Storage/Infiltration Local Storage Regional Storage Stormwater Reduction Practices Conveyance Open Channel Relief Pipe Mechanical Pumping Pipe Efficiency Improvements Conveyance versus Storage year, 2-hour Storm 3000 Existing Capacity 2500 Conveyance Solution Flow (cfs) ac-ft Time (hrs)

4 HAROLD ST NAPIER ST SCHROEDER ST ALMOND ST KLINGENBERG TER F T PLEASANT ST VIOLA ST T Local Storage Storage facilities constructed adjacent to the channel Would require at least 210 acre-feet of storage 7 blocks of acquisitions (approx. 170 homes) Approximately $40 million W 28TH ST LTON ST ST PLEASANT VI EW DR VENTURA DR RKWOOD ST COX S GREELEY ST ERCHANTS LN GOLD ST PIERCE ST CENTRAL AVE KING ST JAC KSON ST WHITE ST E 28TH ST CARROLL ST FOYE ST VALERIA ST ROSALINE ST CLARKE DR ANGELLA ST CUSHING ST WASHINGTON ST E 27TH ST E 26TH ST DIAGONAL ST PAUL ST Q UIGLEY LN TRAUT TER W 24TH ST CHAPEL CT LOWELL ST NARD ST DIVISION ST CARR ST W 23RD ST ELLIS ST CLARK ST E 25TH ST FRANCIS ST DORGAN PL E 24TH ST HEEB ST N MAIN ST MADISON ST MARQUETTE PL SHELBY ST CLINTON ST SUTTER ST PFOTZER ST HENRY ST EDWARDS ST RIES ST WINDSOR AVE REGENT PRINCE ST E 22ND ST E 21ST ST N WHITE ST E 18TH ST HENNEPIN ST MERZ ST QUEEN ST W 15TH ST E 20TH ST WASHINGTON ST JACKSON ST E 19TH ST E 17TH ST EDISON ST PROVIDENCE ST 22ND ST KNIEST ST E 16TH ST LINCOLN AVE E 15TH ST E 14TH ST STAFFORD ST RHOMBERG AVE EAGLE ST KERPER CT PINE ST GARFIELD AVE LINDBERG TER HIGH BLUFF ST SCHILLER ST N MAPLE ST LINCOLN AVE HUMBOLDT ST Bee Branch Mainline N SYCAMORE ST N CEDAR ST TH ST THOMAS P FARLEY ST ANN ST SHALL ST DOCK ST FENGLER ST 16th Street Basin TH ST KERPER BLVD U.S. HWY 61 & TH ST 12TH ST Mississippi Local Storage Summary: Storage that would be provided adjacent to the channel would require the acquisition of 7 blocks of property. The project would be expected to cost approximately to $40 million. Local storage is infeasible due to the high number acquisitions (170 homes) and high cost.

5 PUTNAM ST W LOCUST ST H ODGDON ST HAROLD ST NAPIER ST ALMOND ST KLINGENBERG TER EL LINK ST ST SCHROEDER ST UENA VISTA ST PLEASANT ST VIOLA ST Regional Storage Storage facilities constructed in the subwatershed areas Would require 210 acre-feet of storage or more depending on location Limited, if any, suitable sites 21 acres of acquisition (130 homes) ST SAUNDER PRIMROSE CT $30 million 16th S N ST STOLTZ ST MUSCATINE ST BURLINGTON ST PRIMROSE ST AVENWOOD CT KANE ST W 30TH ST DAVENPORT ST SABULA ST GAY ST BROADWAY ST SPRINGGREEN CT MONROE ST GREENFIELD ST FULTON ST HEMPSTEAD ST W 28TH ST PLEASANT VIEW DR VENTURA DR GREELEY ST MERCHANTS LN GOLD ST E 29TH ST E 28TH ST CENTRAL AVE CARROLL ST KING ST FOYE ST WHITE ST VALERIA ST ROSALINE ST JAC KSON ST CUSHING ST CLARKE DR WASHINGTON ST E 27TH ST DIAGONAL ST PAUL ST TRAUT TER E 26TH ST W 24TH ST CHAPEL CT LOWELL ST PINARD ST DIVISION ST CARR ST W 23RD S T LAW BALKE ST BRUNSW ICK ST STRAUSS ST E 25TH ST FRANCIS ST DEN ST E 24TH ST HEEB ST N MAIN ST MADISON ST SHELBY ST CLINTON ST MARQUETTE PL SUTTER ST PFOTZER ST HENRY ST EDWARDS ST E 22ND ST RIES ST WINDSOR AVE REGENT PRINCE ST E 21ST ST N WHITE ST E 18TH ST HENNEPIN ST MERZ ST QUEEN ST E 20TH ST E 19TH ST JACKSON ST E 17TH ST EDISON ST PROVIDENCE ST WASHINGTON ST 22ND ST KNIEST ST 16TH ST LINCOLN AVE STAFFORD ST RHOMBERG AVE EAGLE ST KERPER CT PINE ST GARFIELD AVE LINDBERG TER HIGH BLUFF ST SCHILLER ST N MA LINCOLN AVE HUMBOLDT ST Bee Branch Mainline N CEDAR THOMAS PL FARLEY ST N SYCAMORE ST ASCENSION ST ANN ST PRES COTT S MARSHALL ST DECATUR ST DOCK ST FENGLER ST HAMILTON ST Bas Regional Storage Summary: Limited suitable and available property would result in the need to acquire at least 21 acres (130 homes) to provide the required storage. Depending on storage method, construction cost of at least $30 million. Moderately high cost and high acquisitions make this option infeasible.

6 Stormwater Reduction Practices Practices include: Rain Barrels Cisterns Rain Gardens Porous Pavement Limited impact on 100- year event A modest rain garden on every residential property would provide less than 8% of the required storage Stormwater Reduction Practices Summary: Stormwater reduction practices are effective at controlling runoff from small rainfall events and at improving the water quality of stormwater runoff. However, they could not significantly impact or improve the Bee Branch flooding problems. Stormwater reduction practices are infeasible because they could not solve the Bee Branch flooding problem.

7 Open Channel Remove and replace Bee Branch with an open channel below 24 th St. Channel top width of will be 150 to 170 feet. Requires approximately 70 acquisitions subject to the development of an alignment Most affordable solution Open Channel Summary: The open channel option could solve the Bee Branch flooding problems. A relatively moderate amount of acquisitions would be required. Various opportunities exist to create amenities as part of this option. The estimated cost is $17 million. The open channel option is rated good or fair for the four screening criteria and warrants further consideration.

8 Relief Pipe Construct additional pipes to expand the capacity of the existing Bee Branch Conveyance improvements range from 7 feet by 30 feet near 25 th Street to 12 feet by 90 feet at the outlet (provided in number of pipes). Reduces property acquisitions (50 homes) Costs are approximately $50 million Relief Pipe Summary: The relief pipe option could solve the Bee Branch flooding problems. Acquisitions are minimized and the changes to the neighborhood will be limited, however the costs are approximately $50 million. The relief pipe option is rated good for all the screening criteria except for cost. The relief pipe option may be viable as a project component to limit acquisitions or improve neighborhood connectivity.

9 T W Pumping Construct two pump stations to pump water through new conveyance structures to the outlet Pump stations are very large and construction cost estimated to be $60 million FOYE ST L ST ST VALERIA ST H ST ROSALINE ST CLARKE DR ELLA ST CUSHING ST DIAGONAL ST PAUL ST ALMOND ST QUIGLEY LN TRAUT TER E 26TH ST W 24TH ST CHAPEL CT LOWELL ST DIVISION ST CARR ST W 23RD ST KLINGENBERG TER ELLIS ST CLARK ST E 25TH ST FRANCIS ST DORGAN PL FAIRVIEW E 24TH ST HEEB ST N MAIN ST MADISON ST SHELBY ST TE PL MAIN ST HENRY ST EDWARDS ST WINDSOR AVE REGENT PRINCE ST E 22ND ST E 21ST ST N WHITE ST E 18TH ST MERZ ST QUEEN ST W 15TH ST E 20TH ST E 19TH ST JACKSON ST LORAS BLVD EDISON ST PROVIDENCE ST W ASHINGTON ST E 17TH ST 22ND ST KNIEST ST E 16TH ST LINCOLN AVE E 15TH ST E 14TH ST STAFFORD ST RHOMBERG AVE E 13TH ST KERPER CT PINE ST GARFIELD AVE HIGH BLUFF S LINCO SCHILLER ST HUMBOLDT ST Bee Branch Mainline N MAPLE ST N CEDAR ST E 12TH ST FARLEY ST N SYCAMORE ST 16th Street Basin E 11TH ST FENGLER ST KERPER BLVD U.S. HWY 61 & TH ST 12TH ST Pumping Summary: The pumping option could solve the Bee Branch flooding problems. There will be a modest amount of acquisitions and some neighborhood impacts. The project costs are estimated at $60 million. The pumping option has a high cost. Other screening criteria are rated good or fair.

10 Pipe Efficiency Improvements Use Bernoulli principle to improve pipe efficiency (essentially a jet pump) Uses pumps to create the jet, less efficient than direct pumping of the stormwater Source: Russell Hoffman Pipe Efficiency Improvements Summary: The pipe efficiency improvements is essentially a version of the pumping option. Using a jet pump would be less efficient than traditional pumps to move the stormwater runoff at the required rate. This option is a less feasible (technically more difficult and more costly) version of the pumping option.

11 Review and Consensus on Viable Options Formulation of Preliminary Alternatives Feasible options (or combinations of options) will become project alternatives Agree on preliminary alternatives that will be presented and evaluated in Meeting 4 Develop (for Meeting 4): Required components Alignments Costs

12 Confirmation of Evaluation Criteria Criteria Weighting Exercise Results Evaluation Criteria Scales BBCAC Evaluation Criteria Evaluation Criteria Performance Measure Score Weight Preserve commercial/ non-commercial Services Number of services lost through business relocation Minimize residential property acquisitions Minimize cost Preserve neighborhood access/connectivity Minimize health and safety risk Enhance quality of life Protect environment Number of residences that must be acquired Estimated project cost Number of streets that are obstructed by the project Number of safety issues identified Relative score of whether alternative adds value or lowers value of the neighborhood Number of environmental parameters that are adversely impacted

13 Possible Open Channel Alignments Develop open channel alignments in groups (15 minute exercise) 1. Use tape to mark possible alignment on map 2. Identify the advantages and disadvantages of your alignment 3. Summarize your approach to the BBCAC Planning Process Meeting 1 Introduction Sept. 25, 2003 Meeting 2 Basis for Evaluation Dec. 4, 2003 Meeting 3 Alternatives Evaluation Jan. 29, 2004 Meeting 4 Additional Alternatives Evaluation Feb. 26, 2004 Meeting 5 Optimize Preferred Alternative March 25, 2004 Meeting 6 Recommendations May 27, Document concerns & objectives 4Understand watershed 4Develop mission statement 4Scoring of initial alternatives 4Formulation/further development of alternatives 4Elimination of infeasible or unacceptable options 4Confirmation of evaluation criteria 4Scoring of alternatives 4Optimize preferred alternative 4Develop draft recommendations for City Council 4Understand modeling approach 4Develop evaluation criteria 4Screen and develop alternatives 4Identify project opportunities 4Additional alternative modifications 4Alternative alignments 4Recommend final alternative 4Finalize summary statement 4Volunteers for City Council meeting presentation

14 Next Meeting Alternatives Evaluation 2 Evaluate Alternatives Additional Alternative Modifications including Alternative Alignments Revise/Update Evaluation Criteria and/or Measuring Scales Confirm next meeting date