GIS UTILITY MAPPING. Akhilesh Pal, P.E. Public Works Department, City of Oskaloosa June 19, 2017

Transcription

1 GIS UTILITY MAPPING Akhilesh Pal, P.E. Public Works Department, City of Oskaloosa June 19, 2017

2 GEOGRAPHIC INFORMATION SYSTEM (GIS) Objective: Prepare a comprehensive Geographic Information Systems for the City s wastewater collection and storm sewer infrastructure mapping. October 17, 2016: Council approved contract with HR Green October 2016 May 2017: HR Green collect and process data with staff assistance June 2017: HR Green completes data collection and delivers GIS database

3 WHY USE GIS? View information graphically. Store attribute information about features. (survey data, condition of pipes, manholes, etc.) Link features to scanned records. (Pictures, televised video data for sewer pipes) Combine database for water, wastewater, and stormwater utilities Upgrade grid system and ID s for assets to be consistent with water, wastewater and stormwater infrastructure

4 WHY USE GIS BASED SYSTEM? Asset Management Rehabilitation/replacement decisions Meet service expectations and regulatory requirements. Financial planning.

5 LOOKING WITHOUT UTILITIES

6 BEFORE GIS No database management Paper records Dependent on staff/employee Time consuming and error prone

7 LOOKING WITH UTILITIES BEFORE GIS

8 LOOKING WITH UTILITIES AFTER GIS

9

10

11 GIS SYSTEM - MANHOLES New and old manhole ID numbers Location & Elevation Pipe inverts & Manhole depth Manhole materials I & I status Cover type and condition Pictures and videos related to the asset

12 GIS SYSTEM - PIPES Pipe Diameter Pipe Material ID for both the upstream and downstream manholes Upstream and downstream rim elevation for manholes Upstream and downstream invert to pipe Pipe length

13 SANITARY SEWER MANHOLES Sanitary Manholes: 1330 o Complete (Inspected & GPSed): 1163 o Not Found: 96 o Unaddressed (Buried): 71 # of Manholes Unit Price Value 1,330 $10, $13,300,000.00

14 Manhole Condition Excellent Good Fair Poor Bad 1,330 Manholes: 550 Good; 457 Fair; 129 Poor; 27 Bad; 167 Unaddressed; 129 Poor 27 Bad

15 Manhole Inflow/Infiltration (I/I) Total of 1,330 Manholes: Of which 571 show signs of I/I What is I/I? Occurrence of storm water or ground water entering into municipal wastewater systems Signs of I/I 1. Staining 2. Weepers 3. Dripper 4. Runner 5. Gusher

16 SANITARY SEWER PIPES (GRAVITY MAINS) Material LF Vitrified Clay Pipe 258,762 Polyvinyl Chrloride 70,264 Reinforced Plastic (Truss) 28,995 Reinforced Concrete 15,760 Cast Iron 4,925 Ductile Iron 1,183 Unknown 1,434 Total 381,323 Note: Unknown diameters and materials are due to field conditions which made it impossible to accurately access the data.

17 Note: Unknown diameters and materials are due to field conditions which made it impossible to accurately access the data. SANITARY SEWER PIPES (GRAVITY MAINS) Diameter (in) LF Unit Price Estimated Value $50.00 $43, ,813 $50.00 $590, ,637 $50.00 $11,181, ,407 $50.00 $1,420, ,543 $50.00 $1,977, ,723 $55.00 $1,194, ,112 $60.00 $1,686, ,290 $ $1,207, ,991 $ $1,688, ,753 $ $227, ,109 $ $274, $ $8, Unknown 1,013 $50.00 $50, Total 381,323 - $21,552,764.25

18 SANITARY SEWER PIPES (FORCE MAINS) LF of Force Main Unit Price Value 33,226 $ $4,153, Diameter (in) LF 16 8, , , Unknown 79 Total 33,226 Material LF Polyvinyl Chloride 27,647 Ductile Iron 1208 Cast Iron 24 Unknown 4,347 Total 33,226

19 SANITARY SEWER PIPES / MANHOLES Type LF / # Value Force main 33,226 $ 4,153, Gravity Main 381,323 $21,553, Manholes 1,330 $13,300, Total $39,006,000.00

20 STORM-WATER STRUCTURES Storm-water Structures: 1344 o Inlet: 1053 Complete: 347 Need attributes: 541 Need GPS & Attributes: 164 o Manhole: 226 Complete: 117 Need attributes: 64 Need GPS & Attributes: 44 Not Found: 1 o Outlet: 65 Complete: 22 Need attributes: 35 Need GPS & Attributes: 7 Note: >50% of the system has yet to be identified.

21 STORM-WATER STRUCTURES Structures Number Unit Price Value Manholes 226 $10, $2,260, Inlets 1053 $5, $5,265, Outlets 65 $5, $325, Total $7,850,000.00

22 STORM WATER PIPES Material LF Reinforced Concrete 29,242 Vitrified Clay 13,003 Corrugated Platic 4,545 Polyvinyl Chloride 3,127 Brick 3,460 Cast Iron 631 Corrugated Metal 46 Unknown 9,352 Sum 63,408 Note: 1. Unknown diameters and materials are where inspections were unidentified and incomplete. 2.The storm sewer numbers are from the assets HR Green has currently identified, where they have estimated that +50% of the system has yet to be identified.

23 STORM WATER PIPES Diameter (in) LF Unit Price Estimated Value $50.00 $22, ,896 $50.00 $94, ,668 $50.00 $83, ,708 $65.00 $501, $90.00 $72, ,022 $90.00 $1,262, $90.00 $34, ,469 $90.00 $672, ,144 $90.00 $283, ,790 $90.00 $611, $90.00 $70, ,052 $90.00 $184, ,850 $ $407, $ $210, ,985 $ $436, $ $158, Null 10,849 $90.00 $976, Sum 63,408 - $6,080, Note: 1. Unknown diameters and materials are where inspections were unidentified and incomplete. 2.The storm sewer numbers are from the assets HR Green has currently identified, where they have estimated that +50% of the system has yet to be identified.

24 STORM WATER INFRASTRUCTURE Type LF / # Value Pipes 64,408 $6,080, Manholes / Inlets / Outlets 1344 $7,850, Total $13,930,700.00

25 NEXT Maintain GIS Database Staff will collect new data for reconstructed assets (manhole/pipes) Incorporate televised video recordings Financial planning (Capital Improvement Plan)

26 NEXT Complete GIS Data Collection Sanitary Sewer o 12.5% remaining (167 of 1330 manholes) o $15,000 - $25,000 + Staff time. Storm Sewer o > 50% remaining (+855 of 1344 assets) o $70,000 - $75,000 + Staff time

27 QUESTIONS? Akhilesh Pal, P.E. Public Works Director City of Oskaloosa