2015 APWA NC Stormwater Management Division Conference. Case Study: Charleston County Stormwater End to End Asset Management

Transcription

1 2015 APWA NC Stormwater Management Division Conference Case Study: Charleston County Stormwater End to End Asset Management

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3 Performance Management Goal is to Maintain Asset Value Inventory of Assets Condition of Inventory Performance Audit Establish Work Plan Develop Budget

4 Asset Performance Thresholds Define an Acceptable Level of Service Organizational and Customer Performance measurements, not method and techniques. Define a measurable end result standard. Promote continuous improvement. Keep reasonable and consider cost restraints!!

5 Rating Method The LOS ratings are done by comparing existing field conditions to the "threshold" value. If the feature/characteristic meets or exceeds the "threshold" then it is coded as YES it meets the criteria. If it does not meet the criteria then it is coded as a NO. When the survey is complete, the number of YES's and NO's are totaled, and a composite number (using from 1 to 100 scale) produced which represents the level of maintenance currently being provided.

6 Rating Index Random Sampling Statistically valid number of samples Break into One or two tenth mile segments Perform rating routinely and periodically (Quarterly, Annually, etc)

7 The Mission of this Program is to Establish: Public perception and expectations Develop the funding level to meet the publics expectations Prioritize maintenance operations Achieve a uniform service level throughout the system by identifying excessively high or low areas of maintenance Identify areas requiring additional equipment or employee skills to improve levels of service in those areas

8 Drainage Service Asset : Cross Pipes Desired Outcome : Functional, Structurally Sound, and No Erosion or Sediment Effecting Functional Capacity Performance Standard : Minimal Obstruction with Greater than 60 % of the diameter Open Joints Intact and No Crushed Pipes No Evidence of Detrimental Flooding End Protection Intact and flap gate functioning as applicable No Settlement in Road Over the Pipe Indicating Structural Problems No Detrimental Erosion at Pipe Ends

9 Cross Drain does not meet MRP standards when the following exist: 1) More than 40% of the cross sectional area of the pipe is obstructed. 2) Any portion of the pipe is collapsed or crushed, including bell ends. 3) End protection is displaced, or flap gate is damaged or inoperable. 4) There is noticeable settlement in the roadway over the pipe. 5) Detrimental erosion or scour is observed at the outlet end.

10 Greater than 60 % of the cross sectional area should not be obstructed. This inlet does not meet desired maintenance conditions. Drainage

11 Open Channel Stormwater CLASS This component of the classification system is related to the type of channel. There are four (4) types of channels: Canal (Class C), Ditch (Class D), Swale (Class S) and Wetland (Class W)

12 Canal (C) Canals are the largest channel types in place in Charleston County. They are typically maintained by hand using hand powered devices (i.e. weed eaters, bush axes, chainsaws, etc). These canals cannot typically be maintained by machines (i.e. backhoes) due to the width of the canal being beyond the reach of a machine. The standard dimensions of canals are as follows: Shelf Width: 20 ft (both sides if deeper than 4 ) Channel Width: 20 ft Channel Depth: 5 ft Side Slope: 1.5:1 (H:V) max

13 Ditch (D) Ditches are mid sized channels that are of such size (width) that they can be maintained by machines. These structures comprise the majority of the open channels maintained by Charleston County and may include outfall ditches. Figure 2 shows a typical cross section of a ditch. Ditch Typical Cross Section The standard dimensions of ditches are as follows: Shelf Width: 20 ft (at least one side) Channel Width: 10 ft, 20 ft Channel Depth: 2, 5 ft Side Slope: 1.5:1 (H:V) max

14 Evaluation: Canals do not meet MRP standards when more than a 20% total reduction is applied: 1) A major blockage is present that includes any sort of manmade blockage (fence, shed, etc.) and/or natural obstruction (trees, shrubs, etc.) that is within the easement and blocks more than 50% of the easement or shelf width. 1) Shelf width is less than 20 feet. (either side if deeper than 4 ). 1) Trees or other heavy vegetation in excess of 4 inches in diameter are present in the channel. 1) There are erosions, washouts, or buildups that adversely affect the flow of water. 1) Average vegetation height along the channel and shelf exceeds 18 inches. 20% 10% 20% 10% 10%

15 Weighted Score Grade Overall Description >90% A Good >80% and 90% B Fair >70% and 80% C Bad 70% F Unacceptable

16 Vegetation in this canal exceeds the 18 inch threshold; therefore it does not meet the desired condition and receives a 10% reduction.

17 Signs Signs shall not lean more than 1 inch per foot of post length. The measurements show that the sign is leaning 1 ½ inches in a 1 foot length and therefore does not meet desired maintenance conditions.

18 TRAFFIC SERVICES # Sites Passing Rating Raised Markers Striping Pavt. Symbol Guardrail Attenuator Regulatory Sign Object Marker Sign Lighting Hwy. Lighting DRAINAGE # Sites Passing Rating Storm Drain Side Drain Cross Drain Roadside Ditch Canals Outfall Ditch Curb Inlet Misc. Drain. Struc Rdwy. Sweeping

19 County Wide Infrastructure Report Card Roadway 70 Roadside 66 Vegetation- Aesthetics 73 Traffic Services 82 Drainage System 74 Open Channel 74 COUNTY WIDE 74

20 Regulatory Sign Work Calculation MRP Score = 40 Minimum = 70 30% of inventory does not meet the desired minimum threshold. If the sign inventory is 20,000 units, then 20,000 x 0.30 = 6,000 The backlog workload is 6,000 units. 6,000 x $40.32 per sign unit = $241,920 This number represents the backlog workload and budget needed to achieve the desired minimum level of service.

21 Work Planning

22 Data Collection Methodology PinPoint PublicWorks AssetWorks CodeWorks CountyWorks WaterWorks WinterWorks DisasterWorks PublicSafety D.O.T. Key Attributes: Simplicity of Process Non-Technical Operators Single Pass,Multiple Collections Single App, Daily Use

23 Asset Class Examples Storm Water Systems Canals Wetlands Swales Inlets Outfalls Pipes Culverts Manholes Catch Basins

24 Asset Class Examples Storm Water Systems Canals Wetlands Swales Inlets Outfalls Pipes Culverts Collection Types Asset Layer Creation with Attributes & Pictures, Linear or Point Based Condition Inspection Compliance Inspection Work Order Creation Work Order Completion

25 Collection Objectives Asset Layer Creation Condition Inspection Compliance Inspection Work Order Creation Initial GIS Mapping with Attributes, Amenities, Pictures, Linear (Poly Line ) or Point Based Current Maintenance Condition, Installation, Efficacy, Operation, Maintenance Prediction ADA, DHEC,EPA,FEMA, DoT Documentation Export to ESRI, Cartegraph, PubWorks, and almost any other work order or asset management system Work Order Completion

26 Asset Management Objectives Layer Acquisition (what stuff do I have?) Mapping (where is all my stuff) Inspection (what condition is my stuff in?) Service Request (what stuff needs fixin?) Documentation (lists & descriptions of my stuff?) Compliance (is my stuff up to code?) Rating (statistical snapshot of my stuff?)

27 Collection Methods: Point Based Lat/Lon Asset Category Description Physical Desc. Attributes. Amenities. Condition Independently collected points marking unrelated assets Line/Area Based Start Lat/Lon End Lat/Lon Intermediate Lat/Lon Intermediate Events A Series of connected points with a Start Point, End Point, and multiple points in between..

28 Think Linear! Automatically Collected Breadcrumbs

29 Think Linear! Events or Observation Points

30 Nearest Asset Identification and Lookup Selectable Asset Layers allows data collected to be associated with specific asset

31 In One Pass: Multiple Polyline Layer Acquisition Potential Illicit Inspection Points Blockage, Erosion, Vegetative Encroachment Points Maintenance Shelf Layer, Dimensions and Events Linear Issues such as trees growing along canals Pictures, Voice Notes, Condition Scoring And anything else you can think of

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33 EXPORT and INTEROPERABILITY RouteSmart SQL Server ESRI CityWorks Cartegraph PubWorks MS Excel Open GeoDatabase Garmin POI AutoCad Google KML MS Word Intergraph Citizen Alert Websites

34 Reporting and Automation

35 PinPoint GeoWorks tm GPS Based Government Management Tools: One Tool.. PinPoint PublicWorks tm AssetWorks CodeWorks tm CountyWorks tm WaterWorks tm WinterWorks tm DisasterWorks tm PublicSafety tm D.O.T. tm Hundreds of Applications.. Limited Only by Your Imagination