There are two recurring projected revenue streams to be used paying down stormwater bond issues. Council approved these starting in 2008 for the next 30 years. Click on graph for a larger image.
This chart shows a projected smooth rise in the 1/4% Home Rule Sales Tax allocated to stormwater bond debt repayment, rising from $1M in 2008 to slightly over $2.1M in 2037. Year over year the projected revenues start increasing at 2.42% and accelerate to 2.73%. Undoubtedly there will be a dip somewhere, and maybe a peak somewhere, but these seem fairly modest figures.
This chart reflects projected property tax revenues for stormwater bond repayment. The trending is similar but somewhat more accelerated, showing underlying property values of the village as a whole more than quadrupling over the next 30 years. This kind of growth is not wholly residential-based. Given the projects DG should have in the pipeline for commercial development, these cheerily optimistic estimates are not unwarranted.
So far, it seems reasonable and doable. A big economic slump hitting both retail sales and real estate values early into this 30 year cycle would have a depressing effect over the life cycle of the bonds. How internet sales are taxed, and how those sales taxes are distributed, will also impact HRST collections.