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Groundwater Flow Problems in Colorado Springs (… or, its why they call it the Springs) 1.

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Presentation on theme: "Groundwater Flow Problems in Colorado Springs (… or, its why they call it the Springs) 1."— Presentation transcript:

1 Groundwater Flow Problems in Colorado Springs (… or, its why they call it the Springs) 1

2 HBA LOGO Presentation Outline Background on Groundwater Underdrains Background on Groundwater Underdrains Problems – Underdrain System Failures Problems – Underdrain System Failures Proposed Solution Proposed Solution Underdrains vs. Sump Pumps? Underdrains vs. Sump Pumps? Implications of Proposed Solution Implications of Proposed Solution Conclusion & Recommendations Conclusion & Recommendations 2

3 HBA LOGO Groundwater Underdrains – Technical Team City EngrHBACSU Cam McNair Bobby Ingels Brent Schubloom Steve Kuehster Bob Branson Charlie Morgan Brian Huth Marla Novak Mike Weber Tom Repp Marc Whorton Peter Bond3

4 HBA LOGO Groundwater Conveyance Groundwater can be conveyed through an underground pipe network called an Underdrain system. Groundwater can be conveyed through an underground pipe network called an Underdrain system. Protects foundations and basements from flooding. Protects foundations and basements from flooding. Used in Colorado Springs since the 1960s – 1970s. Used in Colorado Springs since the 1960s – 1970s. 4

5 HBA LOGO 5

6 Background – What are Underdrains? UNDERDRAIN SANITARY SEWER6

7 HBA LOGO What are the issues? Underdrain failures can cause public health problems Underdrain failures can cause public health problems No claims to Ownership No claims to Ownership Liability to Fund Repairs Liability to Fund Repairs Inadequate Standards for installation Inadequate Standards for installation No Maintenance No Maintenance7

8 HBA LOGO Recent Underdrain Failures 6400 block, Summer Grace Street 6400 block, Summer Grace Street 1300 block, West Costilla Street 1300 block, West Costilla Street Phil Long Expo Center Phil Long Expo Center 2500 block, Integrity Court 2500 block, Integrity Court 6800 block, Grand Prairie Drive 6800 block, Grand Prairie Drive etc. etc. Costs to repair average $10K - $50K each Costs to repair average $10K - $50K each8

9 HBA LOGO Underdrain Failures STORMWATER OUTFALL INTO SAND CREEK CRAWL SPACE BASEMENT SANITARY MAIN SUMP PIT OUTFALLS PLUGGED UNDERDRAIN MAIN9

10 HBA LOGO What are the Solutions? Proposal = Partnership among HBA, CSU and City Engineering Proposal = Partnership among HBA, CSU and City Engineering10

11 HBA LOGO Proposal City Takes Ownership of Underdrain Main lines serving single- family residential homes and nonresidential that opt in to connect to public UD mains City Takes Ownership of Underdrain Main lines serving single- family residential homes and nonresidential that opt in to connect to public UD mains HBA - As representatives of the building industry, has agreed that developers & builders are willing to pay reasonable fees/costs for a long term solution to the UD problem. HBA - As representatives of the building industry, has agreed that developers & builders are willing to pay reasonable fees/costs for a long term solution to the UD problem. CSU - reviews designs, inspects installations, and makes repairs when necessary CSU - reviews designs, inspects installations, and makes repairs when necessary SWENT - manages funds, maps systems, coordinates CSU repairs, coordinates with State (CDPHE) SWENT - manages funds, maps systems, coordinates CSU repairs, coordinates with State (CDPHE)11

12 HBA LOGO What would the City Own? 12

13 HBA LOGO What would the City Own? 13

14 HBA LOGO What will it cost? ALL ARE ONE TIME FEES Developer- CSU plan review and inspection fee= $23 per SF Residential lot ( triplex). $92 per Non-Residential lot (with GU main). CCTV inspections on T&M basis. Builder - City Underdrain maintenance fee= $60 per SF building permit. Non-Residential plus the mandatory State permit: (if connected) < 2 acres$ acres $ acres$180 > 10 acres $30014

15 HBA LOGO What about basement/crawlspace Sump Pumps? 15

16 HBA LOGO 16

17 Sump Pumps Ground water volumes can be so over- whelming such that a pump cannot keep up with the groundwater infiltration Ground water volumes can be so over- whelming such that a pump cannot keep up with the groundwater infiltration Resulting in flooding Resulting in flooding17

18 HBA LOGO Sump Pumps Groundwater Underdrain fees are intended to be used to repair and maintain Underdrain systems only. Groundwater Underdrain fees are intended to be used to repair and maintain Underdrain systems only. Not for sump pumps or discharges from sump pumps. Not for sump pumps or discharges from sump pumps. Groundwater Underdrains cannot be retrofitted in areas that were not originally built with them – cost prohibitive. Groundwater Underdrains cannot be retrofitted in areas that were not originally built with them – cost prohibitive. City Street Division uses French Drains (shallower collection systems) for sump pump discharge problems. City Street Division uses French Drains (shallower collection systems) for sump pump discharge problems.18

19 HBA LOGO Implications with Implementing the Proposal Financial Financial Liability/Risk Liability/Risk Null Alternative Null Alternative19

20 HBA LOGO Conclusions & Recommendations City/CSU/HBA – PARTNERSHIP RECOMMENDS: City Takes Ownership City Takes Ownership DEVELOPERS and BUILDERS agree to pay reasonable fees to CSU and City (SWENT) DEVELOPERS and BUILDERS agree to pay reasonable fees to CSU and City (SWENT) SWENT manages the money and the overall program SWENT manages the money and the overall program CSU performs duties of plan reviewer, inspector, and repair contractor CSU performs duties of plan reviewer, inspector, and repair contractor20

21 HBA LOGO For More Information: Details available on web - Details available on web - Technical Standards Technical Standards City Code Changes City Code Changes Fees Fees Rate Case Rate Casewww.SpringsGov.com/GroundwaterUnderdrains21

22 HBA LOGO Questions22


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