THUNDER BAY AREA DRAINAGE MASTER PLAN

Transcription

1 THUNDER BAY AREA DRAINAGE MASTER PLAN

2 Overall problem Vs. local solutions There are several areas with local flooding problems A review of the situation showed that the problem is not local, but that the existing outlets are insufficient to carry the storm water load The present goal is to determine a solution which will reduce the storm water load in the ditches and carry the water to an outlet as efficiently as possible.

3 Existing Condition For a 5 year storm event Almost all water is carried through surface ditching Some rain water goes to the friendship trail Some rain runs east on Thunder Bay road to Six-Mile creek Most rain goes out the Shirley road outlet

4 Image of existing drainage pattern

5 Existing Condition Most rain travels through surface ditching Effectiveness of the system is limited by water level and storage capacity of the outlets The system s ability to drain is significantly impacted by the wind direction over the lake and the water level in Six-Mile Creek

6 Problems with existing condition Friendship trail ditch running at capacity Thunder Bay ditches overflowing Shirley outlet at capacity Provincially significant wetland Species at risk Areas which run over private property Limits any significant maintenance

7 Images of Shirley Outlet

8 Proposed Master Plan Redistribute the drainage basins Improve 3 existing outlets Friendship Trail Burleigh Thunder bay or Bernard Significantly reduce the flow going through the Shirley outlet

9 Friendship Trail New ditch on south side of trail (twinning the ditch) From Bernard to Six-Mile Creek Double the storage capacity of the outlet during heavy rain events Significantly improve the drainage for the Jewell & Hyman area Approx cost $

10 Image of proposed Friendship trail ditch outlet

11 Burleigh Road Outlet Will drain Burleigh Road and areas to the west Improve outlet into lake Erie at south end of Burleigh Road Outlet with a 1.8m x 1.2m (4 foot by 6 foot) box structure Approx cost $1.3 million

12 Image of proposed Burleigh Road outlet

13 Thunder Bay Outlet Possible outlet on Thunder Bay Road. Will drain area south of Riselay, between Burleigh & Bernard Outlet at Thunder Bay Road into Six-Mile Creek Outlet structure will be twin 1.2m (4 foot) diameter pipes Approximate cost $4.0 Million

14 Image of proposed Thunder Bay Road outlet

15 Bernard Street Outlet Possible outlet on Bernard avenue into lake Erie Will drain area south of Riselay, between Burleigh & Bernard Outlet will be a 1.8m x 1.2m (4 foot by 6 foot) box structure Approximate cost $2.0 million

16 Image of proposed Bernard Avenue outlet

17 Image of proposed Bernard Avenue outlet

18 Image of proposed Bernard Avenue outlet

19 Image of proposed Bernard Avenue outlet

20 Design Considerations Streets will retain their ditches. Ditches will be re-sloped to run towards the appropriate pipe inlet. Risk of ditch overflow should be reduced or eliminated.

21 Design Considerations Attempted design with ditches only IE: no pipes Ditch only design with outflows as proposed (Burleigh, Trail, Bernard, Thunder Bay, Shirley) would have ditches up to 1.8m deep (6 feet) Significant negative impact on these roads (deep ditches, tree removals, utility relocations)

22 Proposed 1.8m deep ditches

23 Proposed 1.8m deep ditches PICTURE

24 Bernard Vs Thunder Bay Bernard and thunder Bay outlets should be seen as alternatives to each other Thunder Bay will cost approx $4.0 Million Will outlet to Six Mile creek. Note that during heavy storm events that the creek backs-up which could back-up the system Bernard Street Will cost approx $2.0 Million Will outlet over beach (above high water mark) Town must continue and improve its regular maintenance over beach area. Especially after any storm event

25 Image of proposed overall drainage pattern

26 Expected cost Project including Bernard Outlet will cost approx $3.5 Million Project including Thunder Bay Ave outlet will cost approx $5.5 Million

27 Schedule Phase 1 (2007) Bernard outlet to Thunder Bay Road Twinning of Friendship trail ditch Phase 2 Piping on Thunder Bay and Cook Local ditch improvements Phase 3 Burleigh outlet Piping on Burleigh & Pleasant Local ditch improvements

28 Questions