Groundwater Flow Problems in Colorado Springs (… or, it’s why they call it “the Springs”) 1.

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Presentation transcript:

Groundwater Flow Problems in Colorado Springs (… or, it’s why they call it “the Springs”) 1

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

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

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

HBA LOGO 5

Background – What are Underdrains? UNDERDRAIN SANITARY SEWER6

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

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

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

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

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 ► 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 ► SWENT - manages funds, maps systems, coordinates CSU repairs, coordinates with State (CDPHE) 11

HBA LOGO What would the City Own? 12

HBA LOGO What would the City Own? 13

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

HBA LOGO What about basement/crawlspace Sump Pumps? 15

HBA LOGO 16

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

HBA LOGO Sump Pumps ► Groundwater Underdrain fees are intended to be used to repair and maintain Underdrain systems only. ► 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. ► City Street Division uses “French Drains” (shallower collection systems) for sump pump discharge problems. 18

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

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

HBA LOGO For More Information: ► Details available on web -  Technical Standards  City Code Changes  Fees  Rate Case

HBA LOGO Questions22