Water Treatment Plant Construction and Water Distribution System Improvements
Water Treatment Plant Construction
The City of Granbury is in the process of building a new water treatment plant to be able to provide drinking water for the community and meet the future needs of Granbury’s growing population.
Currently, The City operates a .48 MGD surface water plant, 34 groundwater wells, and purchases water from BRUPA surface water plant (formerly BRA SWATS plant) in order to meet the community’s water needs. The existing facility was constructed in 1985 is not able to meet Granbury’s current water demands.
By building a new water treatment plant, the City will be able to provide the amount of water needed ensure a much higher quality of drinking water. The construction of the plant will also eliminate the need to purchase water from BRPUA SWTP. The new plant will use microfiltration and reverse osmosis methods to treat the high levels of salinity in the water in Lake Granbury. All water treatment will meet Texas Commission on Environmental Quality (TCEQ) requirements.
The water treatment upgrades are designed in three phases. Phase one, which will be complete when the plant opens in fall 2017, will be able to produce 2.5 million gallons of water per day. This will meet Granbury’s current daily water requirements, except on peak demand days when groundwater wells would supplement demand.
Phase One: 2.5 million gallons per day – October 2017
Phase Two: 5.0 million gallons per day – as needed, based on capacity projections
Phase Three: 7.5 million gallons per day – as needed, based on capacity projections
The current water treatment plant remains open and operational until the new plant is completed. The new plant is scheduled to be open and operational in fall 2017.
Water Treatment Plant Construction Updates
February 1, 2016: Construction for the water treatment plant began with initial clearing and excavating.
September 2016: Multilevel concrete slab and piping structure was completed.
January 2017: Walls, precast walls, and double tee roof were completed.
March 2017: Crews are working on electrical work, assembly of microfiltration and reverse osmosis skids, and construction of the flocculation basin area of the plant.
April 2017: The building and roof of the main center is completely constructed. Rooms inside the building are framed in. Membrane, controls, and lighting are in the process of being installed. The flocculation basin has been excavated and is being constructed. The existing ground storage tank is being refurbished.
August 2017: The ground storage tank rehabilitation has been completed. Flocculation basin construction and the 24-inch overflow line to the lake are complete. The Pall membrane microfilter and reverse osmosis equipment is approximately one month from being fully installed. The chemical storage tanks, feed pumps, and the high service pump station are nearly complete. The power generator has been installed, and electricians continue to run wire and controls to the building.
October 2017: The pre-treatment raw pump station, flocculators, and plate settlers are in and have been leak and function tested. Start-up chemicals are delivered and are undergoing lab tests for dosage rates. The micro-filtration skids are installed and water is being run through the system to test integrity. All pieces of the reverse osmosis filtration have been installed. Office and lab installation is finishing. Operator training has begun.
The water treatment upgrades are designed in three phases. Phase one of the plant, which will be complete when the plant opens in fall 2017, will be able to produce 2.5 million gallons of water per day. This will meet Granbury’s current daily water requirements, except on peak demand days when groundwater wells would supplement demand.
The three phases for water production:
• Phase One: 2.5 million gallons per day – Fall 2017
• Phase Two: 5.0 million gallons per day – as needed, based on capacity projections
• Phase Three: 7.5 million gallons per day – as needed, based on capacity projections
Water Distribution System Improvements
In conjunction with the water treatment plant project and expansion of surface water supplies, the City must make improvements to its existing water distribution system to allow for the introduction of this expanded water supply into the distribution system.
The project is being designed and constructed in three phases using the Construction Manager At-Risk (CMAR) delivery method.
Planned Water Distribution System Improvements
Scout Camp Pump Station and Distribution Improvements: The Scout Camp Improvements consist of a new pump station, various valving improvements, a pressure reducing valve relocation, and 21,500 LF of 16-inch water line. The water line will run from the Scout Camp Tank site and will tie into the upper east pressure plane at the new location of the pressure reducing valve (along Hwy 377). This improvement will assist in providing water to the east pressure plane, replacing the water that the east pressure plane previously received from the SWATS facility. The various valving improvements at the site will help to prevent the Scout Camp Tank from overflowing. The pressure reducing valve relocation will help prevent high pressures at lower elevations downstream of the pressure reducing valve. This supply of water to the east pressure plane allows the water wells in the east pressure plane to rest or shut off for a period of time. This rest time allows the wells to recharge, which improves the quality of water that is obtained from the well.
Knox 1 Tank, Hospital and Bridge Crossing Distribution System Improvements: The Knox 1 Tank, hospital, and bridge crossing improvements consist of 12,000 LF of 20-inch water line and various valving and piping improvements. Both the hospital and bridge crossing improvements address bottleneck issues in the distribution system. These bottlenecks restrict the flow of water to key elevated storage tanks and restrain the system from reaching a hydraulic equilibrium. Part of the hospital improvements also address low pressure issues located around the area near the existing west EST and the hospital. Line work around the west EST will place the nearby cul-de-sac on the west pressure plane and will greatly help with pressure issues associated with these areas. Piping and valving work done around the hospital will place several fire hydrants from low pressure lines to high pressure lines and increase the fire flow capacities of those hydrants. For this improvement, the Knox 1 Tank portion is considered an alternative within the improvement. The available option of using a 20-inch water line to replace the existing 12-inch water line to Knox 1 Tank will be presented and explained in the alternative discussions below.
Lakewood Hills Distribution System Improvements: The Lakewood Hills tie in improvements consist of 1,500 LF of 12-inch water line, a pressure reducing valve, and some valve opening and closing to isolate the Lakewood Hills area on to the east pressure plane. This improvement targets low pressure and low fire flow issues that have been associated with the Lakewood Hills area. The pressure reducing valve will be used to prevent pressures from reaching too high of a level.
North Elevated Tank Distribution System Improvements: The north EST improvements consist of 50 LF of 12-inch water line and various valving improvements. These improvements will help prevent the north EST from overfilling while still maintaining pressure to the surrounding areas.
Water Treatment Plant Distribution System Improvements: The water treatment plant improvements consist of 350 LF of 20-inch water line to replace an existing 8-inch water line in the area. This improvement aids in the distribution of water leaving the water treatment plant by conveying the water to several water mains along Highway 377. A key feature to this improvement is opening valves that have since separated the north and south pressure plane. This will combine the two pressure planes into one large central pressure plane. The combining of the two pressure planes, along with an upsized distribution line, promotes better water distribution thought the system.
Meander Estates Elevated Storage Tank and Pump Station Improvements: The Meander Estates improvements consist of installation of a 250,000 gallon elevated storage tank and pump station improvements to improve low pressure issues and distribution within the Meander Estates subdivision.
Portions of the project that will be constructed on previously disturbed properties, and/or are located on either City or public rights-of-way. The project should only subject the environment to typical short-term disturbances associated with construction traffic and equipment. Short-term noise pollution is possible, but will be intermittent and temporary.
The project is expected to be completed, including all performance testing, in May of 2018.
The water distribution project is fully funded by the Drinking Water State Revolving Fund and administered by the Texas Water Development Board. The project is fully funded by the Drinking Water State Revolving Fund.
Distribution Improvement Projects Maps
(click the name to open/download the map file)
Aerial Map Project Overview
Scout Camp Transmission Line
New Lakewood Hills Tie-In
Meander Elevated Storage Tank Improvements
Water Treatment Plant Transmission Lines
New 20 in Water Line on Lake Granbury
Knox Tank Water Line
Upgraded Scout Camp Pump Station Improvements
North Elevated Tank Site Valve Improvements