A flyover presentation showing the proposed community activities center for the city of Southlake will be on the city website, giving voters a clearer picture of what they are deciding in a May bond election.

The video mock-up zooms in on parts of the proposed Y-shaped, two-level structure, and swoops over the site at the southeast corner of Bicentennial Park, near Shady Oak Lane and Southlake Boulevard.

While amounts are still fluid, depending on timing and many other factors, the most recent figures city staff has shown the City Council indicate the bond issue could be for $17.7 million or $25.7 million, depending on whether an aquatics center is included, if construction were to start in 2014 after the May bond election.

But city Finance Director Sharen Jackson said of any bond issue amount, "It's a moving target. There are several different scenarios that will determine the amount of bonds that will be required."

The cost of the project, which includes space for both fitness and community gatherings in 86,500 square feet, is estimated at $32 million or $40 million with an aquatics center.

The exercise amenities currently planned include an indoor running/walking track; fitness area with cardio and weight equipment; group fitness studios; two basketball courts; the possible indoor swimming center with a shallow pool and water slides; a children's indoor playground; and an indoor turf training space.

Community spaces would include a new senior center; a multipurpose room with a capacity of 300 that would include a stage and dividers for smaller spaces; and other rooms to use for classes and meetings.

The city estimates the impact on a household with a $500,000 home in Southlake (the average value) could be $50-$82 a year, once operating costs, bond retirement and revenue from the center are taken into account.

Among the factors that could change that amount: The city is considering selling several pieces of property to lessen any tax impact; the city could decide to build the project in phases; the city could choose to build in 2018, after having saved more money for the project.

City staff members are developing a voiceover to accompany the video flyover when it goes on the website at www.cityofsouthlake.com.

Pilar Schank, city communication and websites manager, said a date for putting the flyover on the site has not been determined.