Master Plan

The existing and proposed physical components of the water system were evaluated in detail and are included in the 2009 Water Master Plan. This document provides details about the Town’s system. The following components of the water system have been evaluated.

• Water Supplies

• Ground Storage

• Elevated Storage

• Pumping Stations

• Distribution System

TCEQ (Texas Commission on Environmental Quality)

Chapter 290 of the Texas Commission of Environmental Quality Rules and Regulations, “Water Hygiene,“ mandates the minimum requirements for water systems operation in the State of Texas

The minimum requirements are as follows:

Total Storage – Equal to 200 gallons per connection.
Elevated Storage – Equal to 100 gallons per connection.
Pressure – Minimum pressure under normal conditions should exceed 35 psi while pressure during extremes may not drop below 20 psi
Pumping – each pressure plane must have two or more pumps capable of delivering two gallons per minutes (GPM) per connection (a capacity of 1000 gallons per minute), and the ability to supply peak demands, whichever is less.

Water Supplies

The Town of Flower Mound obtains its teated water from the Upper Trinity Regional Water District (UTRWD) and the City of Dallas Water Utilities Department (UTRWD) and the City of Dallas Water Utilities Department (DWU). Water is supplied from the UTRWD at the Stonehill Pump Station and from DWU at the Pintail Pump Station. Under its current contract with the UTRWD, the Town of Flower Mound is required to take a minimum of 3.7 MGD. During the winter months (November-May) water from the UTRWD is used to meet morning peak demands. The remaining daily demand is met with DWU water supplied from the Pintail Pump Station. The Town of Flower Mound attempts to maximize its use of DWU water because of its lower cost.

Ground Storage

The Town of Flower Mound currently has approximately 16 million gallons (MGs) of ground storage. The storage facilities include a 10 MG tank at the Stonehill Pump Station and one 3MG, one 2 MG, and one 1MG storage tank at the Pintail Pump Station.

Elevated Storage

The Town of Flower Mound currently has two elevated storage tanks (ESTs) in operation: the Bruton Orand EST and the Waketon EST. The two elevated storage tanks provide approximately 2 million gallons and 1 million gallons of storage respectively. During peak demand months, the high system pressures required to push water from the Stonehill Pump Station to the Western portion of Town require that the Western portion of Town require that the Waketon Tank be removed from service. This has the effect of reducing the Town’s elevated storage capacity to 2 million gallons during peak demand months, typically April through September.

Given the Town’s current population of approximately 62,000 and assuming 3 persons per connection, the Bruton Orand tank by itself may not be sufficient to meet the State-mandated minimum requirements for elevated storage set by the Texas Commission on Environmental Quality (TCEQ). Construction of the proposed 2.5MG Western EST will meet the TCEQ elevated storage requirements through build out as well as provide for the industry- standard elevated storage for fire fighting. Construction of the Western Pump Station and Western Elevated Tank will allow the system serving eastern Flower Mound to function at normal pressures and allow the Waketon Tank to return to normal operations.

Pumping Stations

The Town of Flower Mound supplies trated water from two pump statins. The Stonehill Pump Station includes five 7,000 GPM pumps, providing a firm pumping capacity of 28,000 GPM. During typical winter months, a single pump is operated to supply water during morning peak demands. Three pumps are run during peak demand in the summer months.

The Pintail Pump Station is comprised of two 5,000 GPM pumps and two 3,300 GPM pumps. The pump station provides a firm pumping capacity of 11,600 GPM. In the winter months the pump station is capable of providing average daily demands with one 5,000 GPM pump and one 3,300 pump. During the summer months, the two 5,000 GPM pumps are typically introduced first, followed by the two 3,300 GPM pumps to accommodate peak demands.

A booster pump station was placed in service in February 2009 near the intersection of FM 1171 and Lusk Lane. The booster pump station is designed to provide additional pressure during peak demand periods to the west side of the Town until the Western Pump Station is constructed. The booster pump station has a firm pumping capacity of approximately 4,500 GPM.

Distribution System

Currently, the Town operates on a single pressure plane. This means that for the western portions of the Town to have adequate pressure, the pump stations located in the east must significantly boost their pressure during high demand peirods. As noted above, this rquires that the Waketon Tan be rmoved from service. It also causes other operating challenges throughout the system. Ideally, a town with the size and topographic deversity of Flower Mound would have at least two if not three pressue planes to provide reliable, consistent service.

Ultimately, the Town’s distribution system will be broken into at least two and perhaps three pressure planes. The High Pressure Plane will be served by the future Western Pump Station and contain 2.5 MG of Elevated Storage at the Western EST. The Middle Pressure Plane will be supplied by the Stonehill and Pintail Pump Stations and include the Bruton Orand EST and Waketon EST. The Low Pressure Plane is located south of Spinks Road and wil be supplied by water from the Middle Pressure Plane through pressue reducing valve (PRV) stations.

A Network of pipes delivers water from the pump stations that receive water from the Town’s water providers. Water is conveyed from the Stonehill Pump Station by a 30-inch diameter waterline along Justin Road and a 20-inch diameter waterline along Valley Ridge Blvd. A 30-inch diameter line along Dixon Lane then carries water to the west side of the Long Prairie District. Water is conveyed from Pintail Pump Station by a 30-inch diameter waterline along Flower Mound Road. The transmission main then reduces to a 24-inch diameter and then to a 20-inch diameter west of Long Praiire. Water is conveyed south of Flower Mound Road to the Low Pressure Plane by a 16-inch diameter waterline along Long Prairie Road and a 20-inch diameter waterline along Gerault Road.

The Stonehill and Pintail Pump Station transmission systems are connected by two transmission mains that run north and south through the Middle Pressure Plane: a 16-inch diameter waterline that runs along Bridlewood Blvd. and a 20-inch diameter waterline along Morriss Road. A 20-inch diameter transmission line carries water along Cross Timbers Rd. from Morriss Rd. to the west side of the Town and ends west of the Tour18 area.