Above- and Underground Stormwater Detention Structures

PROJECT FACTS:  Wall Area = 17,760 SF; Max Ht = 18 FT

PROJECT FACTS:  Wall Area = 5,000 SF; Max Ht = 20 FT

CHALLENGE:  The residential developer for this project required a storm water detention basin that was more cost effective and aesthetically pleasing than the continuous cast in place concrete wall originally designed for the project.

SOLUTION:  Our engineers redesigned the detention basin wall from a single large cast-in-place concrete wall to a composite segmental retaining wall/cast in place concrete retaining wall.  We constructed the concrete wall first then butted the segmental retaining wall into it.

VALUE:  This solution provided 25% cost savings over the previously designed wall and provided more pleasing appearance.

PROJECT FACTS:  Wall Area = 5,300 SF; Max Ht = 18 FT

CHALLENGE:  The commercial development required retaining walls to create a below grade stormwater detention pond on a congested construction site with limited right of way.

SOLUTION:  Pinnacle Design/Build designed and constructed a tied-back soldier pile and lagging walls with a cast-in-place concrete facing on three sides of the structure and a segmental retaining wall on the fourth.

VALUE:  The Pinnacle Design/Build solution enabled construction of the stormwater detention basin within the limited confines available.  The solution provided a substantial cost savings over the originally designed cast in place concrete retaining walls.

PROJECT FACTS:  Wall Area = 11,000 SF; Max Ht = 11 FT

CHALLENGE:  The developer of this industrial park wanted to increase his usable space by reducing the footprint of the required onsite stormwater detention pond .  The Civil Engineer had recommended replacing the originally designed 3H:1V pond side slopes with near vertical cast-in-place concrete retaining walls.

SOLUTION:  Pinnacle Design/Build designed and constructed  near vertical MSE vegetated slopes in lieu of cast-in-place concrete walls.

VALUE:  Our solution allowed the developer to effectively reduce the footprint of his detention pond and significantly decrease construction costs versus traditional cast in place concrete walls. 

PROJECT FACTS:  Wall Area = 14,000 SF; Max Ht =  22 FT

CHALLENGE:  The developer of this retail site was required to create a storm water detention structure in high ground water table and exposed surface rock conditions.

SOLUTION:  Pinnacle Design/Build engineered and constructed a composite wall system consisting of a free standing cast-in-place concrete wall abutted to a stone faced MSE wall.

VALUE:  This solution reduced the overall cost of the structure by reducing the amount of cast-in-place concrete required.  In addition, the design was easily adapted to meet the difficult ground water and surficial rock conditions. 

PROJECT FACTS:  Storage Volume = 12,000 CF (Dimensions: 49 FT x 73 FT x 6 FT);  Vehicle Loading = AASHTO H20

CHALLENGE:  The developer of the GeoStorage underground detention system needed to construct a prototype of a new system being marketed to provide more cost effective solutions to conventional underground storm water detention systems.  The system had never been constructed in full scale.

SOLUTION:  Our engineers and construction managers provided the know-how to make the concept reality.  The system was constructed without problems and performed as expected.

VALUE:  By proving that the system could be built as designed, Pinnacle Design/Build helped to introduce a new system that will cut the overall cost of underground storm water detention by 25 to 50%!