Lower Byersville Creek Flood-Risk Mapping Update - City of ...

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City of PeterboroughLower Byersville Creek Flood-Risk Mapping UpdateLIMITATIONS OF ANALYSISThe original DEM supplied by the City, having been based on aerial photographytaken in May 2005, did not reflect recent site developments on the Costco property(circa 2008) on The Parkway east of Crawford Drive, or the recent redevelopment ofLansdowne Place (circa 2009). Site grading plans for these two propertydevelopment has been used to update the DEM for these two specific properties bymanually digitizing sufficient elevation points to provide mapping precision (i.e.density of elevation points) over those two properties that meets or exceeds that ofthe original DEM coverage of those properties.On this basis, the mapping provided in this report represents mapping of surfaceflooding area that is based on best available information, and which therefore can beused as the basis for finalising an update to the flood-risk mapping for this area.3-2087-09-01/R_3-04108226_Byersville Creek Mapping Update 4-208/11/10
City of PeterboroughLower Byersville Creek Flood-Risk Mapping UpdateFINALIZATION OF MAPPING5. RECOMMENDATIONS5.1 Flood-Risk Mapping UpdateIt is recommended that the flood mapping presented in this report (Figure 3.3) beconsidered by the City of Peterborough and Otonabee Region ConservationAuthority, as an update to the Regulatory flood-risk mapping within the ByersvilleCreek watershed below Lansdowne Street West. This would fulfill therecommendation made in the Byersville/Harper Creek Flood Reduction Study (April2009) that the flood-risk mapping in the area should be updated.5.2 Implementation Priorities for Byersville Creek Flood Reduction:With respect to the replacement of the existing twin 2.0-m CSP culverts locatedunder the CPR line east of The Parkway as recommended in the Byersville/HarperCreek Flood Reduction Study report, the analysis presented here has confirmed thatthis individual modification will have immediate benefits in the lower watershed.This analysis has confirmed that his measure should be considered a high priority interms of implementing the various measures recommended in the Byersville/HarperCreek Flood Reduction Study. The Byersville/Harper Creek Study report (Table6.2) recommended that this culvert replacement be considered a top priority giventhat it, along with other measures recommended for the lower watershed, wouldprovide a benefit/cost ratio of approximately 4.2. This recommendation thereforeremains appropriate.The Byersville/Harper Creek Flood Reduction Study report provides an estimatedcost for the culvert replacement of $300,000.5.3 Additional Recommended MeasuresThe Byersville/Harper Creek Flood Reduction Study recommended that culvert inlettrash racks be improved at a number of locations within the watershed.Improvements to various culvert inlet trash racks were identified as a priority forimplementation of the overall flood-reduction strategy.The inlet trash rack on the Examiner Ditch at the pipe inlet to the Erskine Avenuestorm sewer (see Figure 1.2) should be included amongst these priority locations.Routine inspection and clean-out of any accumulated debris along the ExaminerDitch should be part of routine storm drainage system maintenance carried out by theCity.3-2087-09-01/R_3-04108226_Byersville Creek Mapping Update 5-108/11/10
Page 1 and 2: EXCELLENCE INENVIRONMENTALCONSULTIN
Page 3 and 4: City of PeterboroughLower Byersvill
Page 25 and 26: WEBBER AVRALPHSON CRWENTWORTH ST1+0
Page 27: City of PeterboroughLower Byersvill
Page 33 and 34: APPENDIX A: PHOTOS PROVIDED TO XCG
Page 43 and 44: February 9, 2010Dear Resident,XCG C
Page 45 and 46: MOUNTAIN ASH RDBARNES CRROBERT RDER
Page 47 and 48: ResponseNo.XCG file 3‐2087‐09
Page 49 and 50: XCG file 3-2087-09-01 APPENDIX B Pa
Page 53 and 54: C.2.1 Subcatchment Refinements:Refi
Page 55 and 56: FIGURE C-2: SCHEMATIC OF MODIFIED P
Page 57 and 58: For the Regional Storm, the event r
Page 59 and 60: Photo date May 28, 2007Photo date M
Page 61 and 62: WEBBER AVRYE STMOUNTAIN ASH RDROBER
Page 65 and 66: FIGURE D-3 Examiner Ditch West Spil
Page 67 and 68: TABLE D-3HEC-RAS RESULTS for EVENT
Page 69 and 70: TABLE D-5HEC-RAS RESULTS for EVENT
Page 71 and 72: TABLE D-7HEC-RAS RESULTS for REGION
Page 73 and 74: TABLE D-9HEC-RAS RESULTS for REGION
Page 75 and 76: TABLE D-11HEC-RAS RESULTS for REGIO
Page 77 and 78: TABLE D-13HEC-RAS RESULTS for REGIO

Lower Byersville Creek Flood-Risk Mapping Update - City of ...

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