This "Draft Final Report" was prepared by the TSMS, Phase II, Stormwater Master Plan Project Team Simons, Li and Associates, Inc., in association with Camp Dresser and McKee, Inc.; the Rillito Consulting Group; SWCA, Inc.; and Lewis & Roca under contract with the City of Tucson, Department of Transportation.
This report presents the preliminary recommendations for the Stormwater Master Plan based on the analysis and evaluation of stormwater management alternatives which have been completed by the Project Team, City staff, and the TSMS advisory committees.
The results of this analysis and evaluation were presented in the TSMS, Phase II, Task 9 document titled "Watershed-Specific Analysis and Evaluation Report".
The watershed-specific analysis and evaluation of stormwater management alternatives was conducted for the 59 watersheds within the Study Area. These 59 watersheds have been grouped into the 6 major Hydrologic Units, or areas with similar geographic and hydrologic characteristics, which are shown on Figure 1. Figures 2 through 7 show each individual Hydrologic Unit, along with the watersheds contained within the Hydrologic Unit.
Table 1 of this report provides an overview of the recommended Stormwater Master Plan for the 59 watersheds which comprise the City s stormwater system. Nonstructural stormwater management is recommended within 33 of these 59 watersheds. The 33 watersheds constitute 55% of the total area under investigation.
For the remaining 45% of the total area where either combination or structural approaches are recommended, structural solutions are proposed at various individual locations throughout the 26 watersheds.
Recommended nonstructural stormwater management measures generally consist of stormwater management regulations, flood insurance and related Flood Hazard Studies, and preservation of naturally vegetated watercourses where riparian habitat has been identified.
Recommended structural stormwater management solutions generally consist of channelization, channel bank protection, storm drains, and detention/retention facilities.
A City-wide comparison of the nonstructural and structural stormwater management measures recommended as a part of the Stormwater Master Plan is provided in Table 2 of this report.
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