The New S in SSES. Erin Hawkins, CFM, City of Lynchburg Ben Custalow, PE, Greeley and Hansen

Transcription

1 The New S in SSES Erin Hawkins, CFM, City of Lynchburg Ben Custalow, PE, Greeley and Hansen

2 Outline Introduction to the City s program plan Current program status Data collection Statistical analysis / data trends Data Utilization

3 Motivating Factors Better understand risk/consequence of failure Improve routine asset management practices Inform future renewal project decisions Can be accomplished by piggy-backing on existing MS4 permit mapping activities

4 The 4-Year Plan Map every public stormwater asset in the City Perform top-side condition assessment of all public stormwater structures Delineate the MS4 area that drains to each outfall

5 Lynchburg: At a Glance Statistics: Established in 1786 Size: 50 mi 2 Population: 78,000 1 of 3 Combined Sewer System Localities in VA

6 Lynchburg: Up Close µ Urban Area 25,000 Acres CSS Area B A 1,300 Acres (5% of UA) D MS4 Area C 9,000 Acres Legend MS4 Area (Verified) MS4 Area (Unverified) CSS Area Urbanized Area (35% of UA)

7 GIS Updates Item Inlets Manholes Outlets Ditches Pipes Original GIS 5, ,458 3,429 5,987 Verified GIS 7, ,921 4,746 6,815 Change 1, , Change 26% 16% 19% 38% 14%

8 Condition Assessment Scope

9 Inlet Exterior Damage

10 Inlet Interior Damage

11 Manhole Wall/Chimney Damage

12 Ditch - Erosion Major Moderate Minor

13 Ditches Grading Issues Sediment Deposition Ponding

14 Outlet Surface Damage

15 Outlet - Undermining

16 O&M Vegetation Overgrowth Ditch Outlet

17 Recommendations Major Repair Category Description Proposed Action Moderate Repair Minor Repair Structural Structural defect(s) that have a major impact on asset functionality/safety Still functional; no safety issues; but has potential to fail if conditions worsen Completely functional; no safety issues; preventative measure. Rehabilitate within the next year Inspect, verify and rehabilitate within the next 2 years Inspect, verify and rehabilitate within the next 5 years Minor Observation Observed defect; very minor Reassess within the next 5 years No Action No visible defect None O&M Immediate Cleaning > 50% blockage Clean within the next year; include on routine maintenance schedule Routine Cleaning 25% - 50 % blockage Include on routine maintenance schedule No Action < 25% blockage None

18 Conc. Conc. Conc. Brick Block Block Block Brick Brick Data Trends - Inlet Material 14% 4% 12% 11.6% 21% 10% 9.8% 9.6% Brick 8% 6% 75% Conc. 4% 3.9% 3.9% 2% 2.4% 1.0% 0.8% 0.7% 0% % Major % Moderate % Minor Block Brick Concrete

19 20-30 yr yr < 10 yr yr yr < 10 yr < 10 yr yr yr yr yr yr Data Trends - Inlet Age 10% 9% 8% 8.6% 7.9% 17% < 10 yr 20% 7% 6% 5.2% 24% yr yr 5% yr 24% 4% 15% 3% 3.1% 2% 1% 1.4% 2.0% 2.0% 1.8% 1.5% 0.3% 0.6% 0.9% 0.4% 0.4% 0.8% 0% % MAJOR % MODERATE % MINOR

20 Conc. Conc. Brick Conc. Brick Block Block Data Trends - Manhole Material 16% 14% 14.3% 5% 21% 12% Brick 10% 9.3% 8% 6% Concrete 74% 4% 3.7% 3.2% 2% 1.1% 1.6% 0% % Major % Moderate % Minor Block Brick Concrete

21 10-20 yr yr yr yr yr yr yr < 10 yr yr < 10 yr Data Trends - Manhole Age 7% 12% 18% 6% 5.9% < 10 yr 5% 4% 3.4% 4.5% 29% yr yr 24% 3% 2% 1% 2.3% 2.3% 1.8% 1.8% 1.6% 1.6% 1.5% 0.9% 1.1% yr 17% 0% % Major % Moderate % Minor

22 Concrete Grass Rip Rap Dirt Rip Rap Concrete Rip Rap Dirt Concrete Grass Dirt Asphalt Asphalt Asphalt Grass Data Trends - Ditch Material 6% 9% 5% 5.2% 4.5% 7% 6% Dirt Concrete 18% 4.1% 4% 3.6% 3.3% 3.6% 3% Grass 2.2% 60% 2% 1.6% 1% 0.0% 0.4% 1.0% 0.9% 0.8% 0.8% 0.9% 0% % Major % Moderate % Minor

23 30-50 yr yr < 10 yr yr yr < 10 yr < 10 yr yr yr yr yr Data Trends - Ditch Age 10% 9.4% 8% 2% 9% 8% 7.5% 7.5% 5% yr 30% 7% 6% 5% 5.2% yr 4% 3.4% 55% 3% 2% 1% 1.7% 1.3% 1.1% 0.2% 2.7% 2.7% 2.4% 2.2% 2.8% 0% % MAJOR % MODERATE % MINOR

24 30-50 yr yr yr 10 yr yr yr < 10 yr yr yr yr yr Data Trends - Outlet Age 12% 10% 10.8% 13% yr 9% < 10 yr 24% 8.6% 8% 7.0% 7.2% 13% yr 6% 5.4% 5.3% 6.2% 5.6% 5.3% yr 41% 4% 3.0% 3.7% 3.5% 2% 1.9% 1.9% 0% % Major % Moderate % Minor

25 ft ft < 20 ft < 20 ft < 20 ft > 100 ft ft ft ft ft > 100 ft > 100 ft Data Trends - Outlet Location Distance from Street Centerline 4% 4% 3% 3.0% 3.6% 32% > 100 ft. < 20 ft 20% 3% 2% 2% 1.1% 1.3% 1.6% 1.5% 1.7% 12% ft ft 36% 1% 1% 0.7% 0.7% 0.2% 0.7% 0.5% 0% % MAJOR % MODERATE % MINOR

26 Data Trends Summary Poor Condition Older assets (> 30 years old) Block & brick structures Assets located outside of the right-of-way (out of sight out of mind) Good Condition Newer assets (< 20 years old) Concrete structures Assets located within the right-of-way

27 Data Utilization

28 Final Thoughts Condition assessment is a huge need Piggy-backing on mapping field work provides cost savings Data trends help inform large scale renewal projects Integration with GIS & asset management software help inform routine / annual projects

29 THANK YOU