Saving Prospect Lake

Stanford W. Slifer, Greg J. Monley, Kyle Hier, Timothy D. Stark

Research output: Contribution to journalArticlepeer-review


Prospect Lake in downtown Colorado Springs was refilled and the city is once again enjoying the beauty of this wonderful urban treasure. Labor Day 2005 festivities, including a hot-air balloon festival (Photo 1, page 44), showcased the rejunevated lake and park. The use of a PVC geo membrane facilitated the saving of Prospect Lake because the problematic lakebed soils did not have to be excavated, treated, or improved significantly to accommodate the liner. In addition, the liner installation was done quickly, facilitating completion of the entire project in just over three months, which allowed the lake to be filled in time for the Labor Day festivities. The use of air-channel testing resulted in a significant reduction in destructive testing and greater assurance of seam and liner quality. However, both air-channel and air-lance testing were used at sheet temperatures greater than 120°F to ensure identification of defects along the exposed outside edge of the dual seams. Prospect Lake represe nts the largest U.S. PVC geomembrane installation to date that has utilized air-channel testing and limited destructive testing. It is anticipated that successful projects such as Prospect Lake will increase the use of non-destructive tests to enhance the quality of completed liners and the use of PVC geomembranes.

Original languageEnglish (US)
Pages (from-to)44-50
Number of pages7
Issue number1
StatePublished - Feb 1 2006

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Polymers and Plastics

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