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Home My WebLink AboutOPD-009-08~lar-in n Leadin the Wa g y REPORT OPERATIONS DEPARTMENT Meeting: GENERAL PURPOSE AND ADMINISTRATION CO1MMjIT`TE~F~ Q Date: December 1, 2008 ~~Gi.1~1~Ur ' ~ ` ~ ~~~~~~ Report #: OPD-009-08 File #: By-Law #: Subject: HEAVY RAIN EVENTS 2008 Recommendations: It is respectfully recommended that the General Purpose and Administration Committee recommend to Council the following: THAT Report OPD-009-08 be received for information. i Submitted by: Fre Horvath B.A., R.q.M.R., R. R. F.A. Director pf Operations Reviewed by~ -' `~' Franklin Wu. Chief Administrative Officer FH/wc REPORT NO. OPD-009-08 1.0 BACKGROUND: PAGE2 1.1 This past summer staff responded to several heavy rainfall events in a short period of time. During the week starting with Saturday, July 19"' Clarington received 231 mm of rain from four storms that passed through. It is important to note that 58mm of rain fell within forty minutes on July 19~h (Attachment 1). The normal average for July, based on historical data dating back to 1971, is 74.9mm. According to the CLOCA precipitation gauge located in Hampton, Clarington received 332mm of rain. Overall, for the summer months of June, July and August, Clarington received a record breaking 573.5mm of precipitation which shattered the normal average for this period of 259mm (Attachment 2). 2.0 Effects on Operations The active weailher certainly impacted our operations. First of all, $62,367.00 had'to be reallocated from the Department's current budget to respond and take appropriate action to ensure that our road network was safe to travel. Ditching was delayed and reduced and no roadside brushing took place in the fall. Only 54 hours of overtime was required especially with our response after hours on July 23rd Lightning hit our Orono Operations Centre and knocked out the fuel system, computers, telephone, and radio signaler. Even though the signaler was under warranty, this impacted our current budget by $11,015.00. There was a washout of a box culvert on Pebblestone Road west of Trulls Road which was part of our fall maintenance program. Due to the amount of work caused by the severe weather, staff had to contract this work at $15,000.00 in order to save the road from being washed out. REPORT NO. OPD-009-08 PAGE 3 The outflow from a 60 inch cross culvert eroded the ditch bank and caused a major] washout on Concession Road 7 west of Leskard Road. The Ganaraska Region Conservation Authority, Department of Fisheries and Oceans, Engineering and Operations Department are reviewing plans to remedy the situation. This includes the extension of the existing cross culvert beneath Concession Road 7 and the impact to fish habitat. Operations will be taking restorative measures in the interim. The budget for this work is not known yet, pending approval from Ganaraska Region Conservation Authority /Department of Fisheries and Oceans. Concession Road 7 and Langmaid Road cross culvert had to be reset due to the washout at a cost of $8,700.00. Westlake Subdivision in Solina, also experienced some major washouts and Engineering is reviewing the overall drainage and grading plans. With the amount of precipitation over such a short period of time, the water table was certainly high and we experienced many shoulders, roads, ditches, and private properties with flooding issues. Staff has estimated an additional 2,000 tonnes of gravel at a cost of $22,500.00 were used in restoring our roads and additional patch material in the amount of $10,000.00. Due to gusty winds and hail, we had to call in an emergency tree service to assist with removal as a result of tree damage. This is estimated at $8,394.00. Our sports field program also was inconvenienced due to the severe weather. Over 452 hours of approved permits had to be cancelled due to unsafe playing Conditions. We are fortunate that 25% of the cancellations rebooked. REPORT NO. OPD-009-08 PAGE 4 3.0 Stormwater M$nagement Ponds Staff is still evaluating the impact of the heavy rain events to ensure proper functioning. This will include regular inspections of the inlets/outlets, emergency spillway repairs, etc. Most sites will require some general maintenance including, but not limited to, removing invasive vegetation, litter control and inlet cleaning. Maintenance efforts for Stormwater management ponds vary from pond to pond. As some of ourponds are reaching a life cycle where they may require sediment removal, CLOCA and staff will be undertaking a technical assessment of some of our ponds to provide a forecast for budget purposes. As development continues and the inventory of Stormwater management ponds increases, there will be an additional impact to the maintenance program of the Department. Clarington Operations currently has twenty-two (22) Stormwater management ponds to maintain. 4.0 Assistance and Cooperation According to alllweather records available, Clarington received the most precipitation in the GTA over a three month period, and especially over the seven days in J'Nly. Our Department's response to these series of storm cost $147,457.58. The impact to our 2008 Budget is estimated at $80,000.00. Staff would like to thank the CLOCA and GRCA for their cooperation and assistance, and most of all, the public for their patience and understanding as other maintenance activities have been delayed in order for us to respond effectively to the storm. Attachments: Attachment #1 - July 2008 Heavy Rain Events Attachment #2 - Rainfall Comparison -Hampton Gauge CORPORATION OF THE MUNICIPALITY OF CLARINGTON 40 TEMPERANCE STREET, BOWMANVILLE, ONTARIO L1 C 3A6 T (905) 263-2291 F (905) 263-4433 ATTACHMENT NO.: 1 REPORT NO.: OPD-009-OB Heavy Rainfall Whitby -Heber Oshawa Airport Clarington - Date Down CA or Oshawa Creek Hampton CA Taunton Rd July 19, 2008 61 mm July 20, 2008 80 mm 78 mm 72 mm July 23, 2008 57 mm 47 mm 47 mm July 26, 2008 72 mm 76 mm 50 mm August 11, 2008 58 mm 44 mm 40 mm Rainfall Comparison -Hampton Gauge E E R w C .~ ATTACHMENT NO.: 2 REPORT NO.: OPD-009-08