Premature Storm Drainage System Repairs and Replacement
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1 Premature Storm Drainage System Repairs and Replacement Stewart Edwards Program Manager Design Management Team Charlotte-Mecklenburg Storm Water Services April 8, 2015 Date
2 Agenda Storm Water Infrastructure Identifying Problems (Before and After) Infrastructure is Installation Common Premature Problems and Failures What is Storm Water Doing on Our Projects? 2
3 Stormwater Infrastructure Stormwater infrastructure consists of pipe, inlets, junctions, creeks, and ditches Systems in public rights-of-way Systems on private property in public drainage easements Connected as a system Access and easements (private/public versus City) Steele Creek Landing Subdivision 3
4 Stormwater Infrastructure Service Life Expectations (examples) Reinforced Concrete Pipe (RCP) 100+ years High Density Polyethylene Pipe (HDPE) 50 years + TBD Corrugated Metal Pipe (CMP-no longer allowed) years Aluminized (other new coatings) Corrugated Pipe 75 years Life Expectancy comes from different sources ACPA, FHWA, FLH, NASPD, local experience, etc. and assumes appropriate installation. The actual life can be influenced by local conditions, environmental characteristics, installation, use, etc. RCP HDPE CMP 4
5 Identifying Problems During and After Infrastructure is Installed Construction inspection Testing (compaction and materials) Closed Circuit Television (CCTV - video) inspection Confined space entry (Manual Entry) 5
6 Identifying Problems During and After Infrastructure is Installed Bad Joints Cracked Pipe Utility Intrusion Broken Pipe Images from Astonboro Drive (Built 2002) 6
7 HDPE (plastic pipe egged shaped) loss of structural integrity Identifying Problems During and After Infrastructure is Installed Sanitary sewer punched through the storm drain Images from Mallard Landing Road Built
8 Reinforcing steel used to support frame and grate Identifying Problems During and After Infrastructure is Installed Slab cut to move inlet position Images from Mallard Landing Road Built
9 Common Premature Problems Premature failures impact public roads and private property Problems usually are not detected until several years have past. Streets settle Sinkholes form House foundations impacted Need structural shoring during repair construction. Sahalee Lane 9
10 Common Premature Problems Haines Mill Road The Villas at Laurel Valley Built 2006 Precast catch basin leaking around joints Sinkholes formed System is in backyards and access is limited Shoring will be needed to protect the foundations of nearby homes 10
11 Common Premature Problems Provincetowne Drive Reavencrest Built 2001 Separated pipe joints Sinkholes formed Shoring will be needed to protect the foundations of nearby homes 11
12 Common Premature Problems Cozen Way Drawley Farms Built 2004 Sinkholes formed Non-standard structures Poor pipe installation Public safety and liability concerns for the City 12
13 Common Premature Problems Clementine Court Providence Pointe Built 2002 Missing brick in catch basin Sinkholes formed Precast structures leaking Presents a public safety concern to the property owner Limited access to enter and repair system Shoring will be needed to protect the foundations of nearby homes 13
14 Common Premature Problems Sahalee Lane Claiborne Woods Subdivision Built 2000 Sinkhole formed due to pipe being damaged (egged shaped and joints failed) during installation Pipe damage allowed backfill material to migrate away and created a sinkhole Shoring will be needed to protect the foundations of nearby homes 14
15 Common Premature Problems Astonboro Drive Chastain Parc Built 2002 Broken and cracked pipe Road is settling and rutting Potential cavities under the road Estimated $100,000 repair 15
16 Common Premature Problems Steele Creek Landing Mallard Landing Built 2006 Broken pipes and separated joints Sinkholes formed Pipe holding water Estimated $500,000 repair Note: Steele Creek Landing was presented to the City for a voluntary annexation consideration. 16
17 Common Premature Problems Oasis Lane Belmeade Green Subdivision Built 2006 Separated joints, broken pipe, poor compaction Sinkholes formed Shoring will be needed to protect the foundations of nearby homes Estimated $250,000 repair costs 17
18 Challenges (Correcting Problems on Existing Infrastructure) Inconveniencies to traffic and property owners Shoring houses, reconstruction of road infrastructure, restoring landscaping, additional costs Working around utility infrastructure (gas, communication, electric, poles, sewer, etc.) Estimated approximately $2M of the $10M annual Storm Water Budget is needed to repair premature failures Takes away from intent of program Foundation Protection Shoring is not installed during the development phase, but is required during repairs. 18
19 What is Storm Water Doing on Our Projects Increased level of inspection Increased training of inspection staff and contractors CCTV (pipe video) inspection after work is complete and at end of warranty period Longer warranty periods from contractor on questionable infrastructure 19
20
21 The End
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