Future condition and concerns for the planning area portion of the watershed were gathered using a variety of data sources. All resources are referenced in Chapter 7 of this Master Plan. Supporting documentation on water quantity data listed below can be found in Appendix 2 and water quality in Appendix 3.

• Sufficient existing modeling is not available to determine the impact of development in this watershed on the runoff peak rates. The upstream portion of the watershed is in Madison County with a small portion in Hancock County. The Madison County portion is not expected to develop in the foreseeable future. Hancock County has regulations similar to Hamilton County to regulate post- development runoff.
• No control on the 50% annual chance flood developed condition discharge has been or is in the Town or County current ordinances. Based on a study of the Williams Creek watershed in Hamilton County, development under the current ordinance allows for substantial increases in the 50% annual chance flood. Not only does the ordinance allow increases in the peak discharge but also in the duration of the flood. The 50% annual chance flood is typically the channel forming discharge for streams. When that flood frequency increases in discharge and duration, additional stream bank erosion typically occurs. Such erosion affects not only the stability of the bank and the safety of anything on the bank but the quality of the water as well.
• Fall Creek backwater is probably the controlling BFE for Lick Creek. An additional 2 feet of flooding on top of the BFE appears to affect little additional land due to the high bluffs.
• Development will add additional infrastructure which will need repairs or maintenance in order to not adversely impact drainage in the watershed. Maintenance of those portions of the system that are or will be added to the regulated drain or regulated subdivision roles can be accomplished with assessments. Other portions that are under the Town’s jurisdiction can be addressed with stormwater utility funds. The level of funds that will be available may or may not be adequate to cover all of the maintenance required.
• Sufficient existing modeling is not available to determine the impact of development in this watershed on the flood elevations at bridges.
• This watershed is currently considered to be undeveloped and predominantly agricultural land use (70%). Based on available future land use data, this watershed is anticipated to become 100% residential development. As a result, imperviousness is estimated to increase from 42% to 71% which is indicative (typically) of poor water quality.
• With the dramatic transition from agriculture to residential that is expected in this watershed, it is anticipated that water quality in some or all water bodies will likely become impacted by elevated nutrient, bacteria, and total suspended solids especially if traditional development practices are followed.
• Current Stormwater Management Ordinance requires post- construction BMPs to remove 80% Total Suspended Solids (TSS) from stormwater runoff. It is assumed that other pollutants of concern will be captured to some extent with TSS.