Division Ave Drainage
The Division Ave Drainage project is a multi-phase project consisting of the construction of a storm water management system in the Division Avenue area to regulate peak storm flow and sediment loads flowing out of the City of Brookings. The existing channel and storm piping did not have adequate capacity and flooding of low lying properties was regular. The first phase, completed in 2012, consisted of a storm drainage study of a 45 acre drainage basin. Phase 2 was the design and construction of a concrete drainage channel along Western Avenue. The channel ties into several previously built concrete and metal culverts.
To tie into the existing culvert, the concrete channel was designed at a 0.14% slope. With such a minor slope, construction staking and close observation was required for proper construction. SRF funding was provided for Phase 2 and included DBE and Davis-Bacon wage requirements. CDI collected DBE forms, American steel certifications, and certified payrolls in accordance with SRF requirements.
The third and final phase consisted of the demolition of two storage buildings and pavement to make way for a 5.5 acre-foot detention pond. The detention pond was completed in 2016 under the engineer's estimate and well before the stipulated completion date.
CDI provided hydraulic analysis, preliminary and final designs, provided all topographic and construction surveying, construction observation and project management services.
City of Brookings