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.

• Current allowable release rates are not low enough to provide the factor of safety included in the ordinance for all portions of the Shoemaker Ditch watershed. This “factor of safety” is an attempt to offset increases caused by existing development that did not fall under appropriate regulations or are too detailed for modeling (such as the timing aspects of peaks from each of the future individual detention facilities and the potential for that to increase release rates downstream of several detention facilities). The current rates on Shoemaker Ditch are however low enough and the percentage of developable area is small enough that development done according to the ordinance should not cause an increase over the existing peak runoffs for the 1%- 10% annual chance floods. Weaver Creek and Home Run Creek are already developed so no change in runoff is expected.
• 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.
• Along White River, structures appear to be built on bluffs that are well above the 1% and 0.2% annual chance flood elevations.  Future conditions along White River are not expected to cause flooding of additional structures.  Once the new preliminary FIS maps are finalized, modeling results for Shoemaker Ditch can be utilized to determine any potential flood impacts from increased runoff, should that happen to occur in the future.   At present, available studies are insufficient to analyze impacts on the remaining small streams.
• Impact on roads/bridges - no change expected
• This watershed is considered to be fully urbanized with little change to the current land use. Based on available future land use data, it is anticipated that the predominant land use will continue to be low to medium density residential (estimated increase from 46% to 65%). Commercial and industrial development is expected to fill in along SR 37. Imperviousness is estimated to increase slightly from 75% to 85% which remains indicative (typically) of poor water quality.
• Even though water quality sampling in 2009 for this Master Plan (Britton Branch and Allisonville Road) concluded that nutrient levels were below water quality targets, the biological pollutant tolerant index score was excellent, and this sampling site received the highest habitat score, it is anticipated that based on future land use data (increases in residential, commercial, and industrial development), that water quality in some or all water bodies will likely continue to be impacted by elevated nutrient, bacteria, total suspended solids, and metals loads.
• 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. Elevated E.coli and Impaired Biotic Communities violations, as noted in 303(d) Impaired Streams List for the White River, are not addressed.