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CITY OF FLORESVILLE MASTER PLAN As a clarification, as these fees often cause confusion: no existing city resident or business will be affected. Impact fees are charged to new customers who request service or begin development after the date of their implementation. Impact fees are an important vehicle for municipalities and other entities to recoup the costs of infrastructure installation. They allow for infrastructure owners to charge a pro-rata share to new users for improvements already in place or improvements that need to be made. Existing CCN The City of Floresville currently holds Sewer CCN #20279, a 2726-acre region which represents approximately 90% of the incorporated area. The existing CCN is located almost entirely within the city limits. Recent expansions to the sewer lines along FM 97 and Hwy 181 extend beyond the existing CCN. While there are neighboring Water CCNs, there are no nearby Sewer CCNs. Historic Flows The existing TPDES permit authorizes the City of Floresville to discharge 0.90 MGD with a BOD 5 limit of 20 mg/l, a TSS limit of 20 mg/l, and an E. coli limit of 63 CFU/100 ml. The permit expires March 1, 2015. Historic data for the average daily flow and the maximum daily flow was available from January 2006- December 2011. The trend shows a gradual increase in average daily flow of approximately 1.5%, which is consistent with the population growth during this period. 1,800,000 Historical Wastewater Effluent Flows City of Floresville 1,600,000 Flow (gpd) 1,400,000 1,200,000 1,000,000 800,000 Permitted Average Daily Flow Average Daily Flow Maximum Daily Flow Average Flow Trend 600,000 400,000 200,000 0 Rainfall Data Source: Utah State University Climate Center Station Location: Floresville, TX (COOP ID: 413201) The average daily flow per capita ranges from 87 to 99 gpd with an average flow per capita of 92 gpd. This value, which is within the range specified in TAC 217.32, is used to project a baseline average flow. The maximum variation of the three-month average daily flow from the baseline flow is by a factor of 1.21, occurring in the summer of 2007. This peaking factor value was used in the projected peak daily flow for capacity estimations. Year Population AverageDaily Average Daily Flow Flow Per Capita (gpd) (gpd / capita) 2006 6,217 555,901 89 2007 6,275 621,805 99 2008 6,333 558,199 88 2009 6,390 604,409 95 2010 6,448 611,987 95 2011 6,962 607,091 87 Page 32
CITY OF FLORESVILLE MASTER PLAN A plot of recorded flow and total monthly rainfall shows a fairly strong correlation between peak flows and precipitation, indicating a large amount of infiltration/inflow. Precipitation data from the last 15 years suggest that the high rainfall in 2007 is not an aberration, but can be expected every 4-5 years (though of course larger climatic trends would affect this). Consequently, in the absence of significant collection system improvements to reduce infiltration/inflow, the observed three-month peaking factor of 1.21 provides a good basis for long-term <strong>plan</strong>ning. The typical peaking factor for years of more average rainfall such as 2009 and 2010 is approximately 1.1. 8 Historical Rainfall Pattern City of Floresville 7 6 Precipitation (in) 5 4 3 2 3-Month Avg Monthly Precip. 1 0 This data suggests the high monthly precipitation observed in 2007 is not an aberration, and can be expected every 4-5 years. Page 33
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