Contract Dewatering Services, Inc. (CDS) was tasked with providing dewatering services for the construction of Bayou Meto Canal 1000 Phase 1.  This project involved dewatering for the construction of 6,750’ of irrigation canal, associated siphon structures, and 3-cell tainter gate structure designed to control flows into Canal 1000.  CDS provided the design, construction, installation, and implementation of the required deepwell dewatering system, with the assistance of the general contractor.  The general contractor then assumed the day to day operation of the dewatering system, which consists of checking piezometer levels, reading flow meters, processing reports, fueling generators, and general system maintenance as needed.  The general contractor, with CDS’s guidance also performed the rewatering and unwatering as needed.  The rewatering consisted of slowly reducing discharge flow by manipulating valves when necessary and sequencing the shutdown of the submersible pumps to allow the groundwater to slowly return to its natural level.  Unwatering consisted of sumping & pumping surface or rain water as needed during construction.

CDS prepared an appropriate dewatering design with PE stamp to meet the submittal needs.  We based our design on the provided plans, specs, soil borings, and our past dewatering experience.  CDS understands that actual subsurface conditions encountered may vary in the field from the parameters used in the dewatering design. CDS is experienced and prepared to make design adjustments as needed during the construction process including pump size increases, quantity or location of dewatering wells and discharge piping variations. Our design changes approved by USACE allowed us to perform the required dewatering in a professional and efficient manner.

CDS takes pride in providing a safe and economical dewatering solution that is constructed on budget and on time.  During the bid process, we thoroughly design our dewatering systems, note locations of dewatering equipment on marked up plan sheets for visual interpretation, and provide our customers with a detailed & descriptive proposal.  We strive to make the dewatering process & costs as clear as possible to our customers.  We have successfully dewatered many USACE projects in the past and look forward to continuing our excellent working relationship with the USACE.

Above & Below:  Dewatering system for the 3-cell Tainter Gate Structure.  Overhead wire was used to convey power to the submersible deepwell pumps.  Pump control panels were mounted adjacent to each well.  HDPE discharge piping was used to convey the pumped groundwater to the far side of the reservoir noted in the background.  This dewatering system is large enough to be seen from space on Google Earth!

Above:  Constructed clay lined irrigation canal with dewatering system partially obscured by vegetation along right side of berm.

Below:  Foreground of picture is Canal 1000 Phase 1 looking towards Phase 2 site.

Above:  In the Foreground you can see Phase 1 canal where it meets up with Phase 2 canal.  CDS has the resources to easily perform two large canal projects simultaneously.  In the background you can see the white well casings above the land surface.

Contract Dewatering Services, Inc. (CDS) was tasked with providing dewatering services for the construction of Bayou Meto Canal 1000 Phase II.  This project involved dewatering for the construction of 2,700’ of irrigation canal and 550’ of CIP concrete inverted siphon.  CDS provided the design, construction, installation, and implementation of the required deepwell dewatering system with the assistance of the general contractor.  The general contractor then assumed the day to day operation of the dewatering system, which consisted of checking piezometer levels, reading flow meters, processing reports, fueling generators, and general system maintenance.  The general contractor, with CDS’s guidance also performed the rewatering and unwatering as needed.  The rewatering consisted of slowly reducing discharge flow by manipulating valves when necessary and sequencing the shutdown of the submersible pumps to allow the groundwater to slowly return to its natural level.

CDS prepared an appropriate dewatering design with PE stamp to meet the needs for the Bayou Meto Canal 1000 Phase II project.  We based our design on the provided plans, specs, soil borings, and our past dewatering experience.  CDS understands that actual subsurface conditions encountered may vary in the field from the parameters used in the dewatering design. CDS is experienced and prepared to make design adjustments as needed during the construction process including pump size increases, quantity or location of dewatering wells and discharge piping variations. Our design changes approved by USACE allowed us to perform the required dewatering in a professional and efficient manner.

CDS takes pride in providing a safe and economical dewatering solution that is constructed on budget and on time.  During the bid process, we thoroughly design our dewatering systems, note locations of dewatering equipment on marked up plan sheets for visual interpretation, and provide our customers with a detailed & descriptive proposal.  We strive to make the dewatering process & costs as clear as possible to our customers.  We have successfully dewatered many USACE projects in the past and look forward to continuing our excellent working relationship with the USACE.

Below:  Beginning of the canal deepwell dewatering system.  Overhead wire was used to convey power to the submersible deepwell pumps.  Pump control panels were mounted adjacent to each well.  HDPE discharge piping was used to convey the pumped groundwater to the discharge point.  This creates a durable & leak free discharge system.

The dewatering was completed ahead of schedule & on budget.  Successful design on Phase 2 helped CDS to be the successful bidder for also dewatering BAYOU METO CANAL 1000 PHASE 1.  (The bidding for Phase 2 was completed before Phase 1)

We were contacted by a general contractor concerned about groundwater problems while installing a new headworks building at an upcoming WWTP improvements project.  CDS obtained digital copies of the Site Plans, Specifications, and Geotechnical Report to start right away designing a dewatering system.

The jobsite showed challenges of heavy clay on top, silty fine sand in the middle of the excavation and underlain by clay & limestone.  At a site visit the owner reported their well on site exhibiting artesian flows during high groundwater events.  CDS also researched local well logs to confirm site conditions and assumptions. Utilizing this information we worked with the owner, general contractor, and engineer to custom design a dewatering system that fit the project and budget.

CDS’s solution was a dewatering system installed around the perimeter of the excavation to control groundwater and allow installation of boards and lagging Earth retention system.  As noted in the pictures efforts were successful and the excavation was completed without complications.

CDS was tasked with designing a dewatering system for the construction of the “Rack 12” Combined Sewer Overflow (CSO) Basin in the town of Akron, OH.  CDS routinely works on CSO basin projects all over the Midwest.

As cities look for ways to comply with the Consent Degree laws, often the solution is large deep storage basins with upgrades to major sewer piping and interceptor sewers.  At this project CDS was required to lower the groundwater on the order of 25’ for the construction of the CSO basin with approximate 200’ x 400’ excavation.

The picture below shows the jobsite the first day of drilling, with obvious water in the excavation after removing the topsoil.