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This project included channel rectification of approximately 1 mile of Sims Bayou. The limits of the project were from Robin Boulevard (station 740+00) to SH 288 (station 682+77).
The scope of work included dewatering, ditching, installing storm water pollution prevention items, clearing, demolition, installing steel sheet piling, excavating, compacted fill, installing relief wells, installing geotextile, installing articulated concrete blocks (664,841.41 SF), pouring concrete slope paving, installing sub-drainage system, installing storm drains and turf establishment.
One of the major tasks encountered while excavating the channel and installing ACBs was the handling of the existing channel flow of Sims Bayou. LECON devised a Care of Water Plan to divert the existing flow around the work area so that all work activities could proceed in the dry. LECON worked closely with the USACE in implementing the Plan so that damage to work in extreme rain/flood events would be minimized, thus allowing work to resume sooner.
LECON utilized the geotechnical report, prior to bidding the project, to design a successful dewatering system that would allow for the relief of existing Artesian pressure and seepage. This included pumping on relief wells, the utilization of well pointing and the incorporation of ‘horizontal drains,’ which relieved the associated pressures and seepages.
LECON also used Hydrographs to design a diversion channel which enabled us to remove the surface water so that construction on the channel template could proceed and be completed. This diversion acted a as a temporary ‘channel’ for Sims Bayou’s normal flow.
