RDR 3 Report - Flood Control District of Maricopa County

VIII. IMPLEMENTATION PLAN
A. Introduction
This Section contains recommendations for funding, cost sharing,
budgetary and construction phasing for the recommended projects
identified in Section V.
B. Construction Phasing
For budgeting purposes, capital improvements must be prioritized and
constructed in phases as funding permits. To identify phasing of capital
improvements, three priority categories are used. Priority 1 projects are
current needs that should be constructed as soon as possible to correct
existing system deficiencies. Priority 2 projects are projects that should
be budgeted now for construction over the next five years and are
needed to accommodate the anticipated development over the next five
years. Priority 3 projects are improvements that are not needed within
the next five years but will be needed as development occurs.
Construction scheduling of priority 3 projects will be dictated by
development timing and patterns.
Priorities were assigned for each project by the Review Committee at
the Review Committee Meeting held on January 23, 2001. The
assigned priorities will act as a guide to the relative urgency of the
storm drainage improvements and will form the basis for developing
project funding and Capital Improvement Program (CIP) budgets. It is
recognized that the priorities will be subject to revision for various
reasons during project implementation. For instance, in the next few
years changes in development patterns may occur within the study area.
The current financial obligations of government agencies or that of land
developers may also vary. Further, as scheduling of roadway
construction in the area becomes clearer, significant savings may be
achieved by coordinating box culvert and channel construction with
that of the roads or highways.
Figure VIII-1 illustrates Priority No. 1, 2, and 3 projects. Table 2
summarizes each of the master plan projects and their construction costs.
1. Durango Regional Conveyance System
The Durango Regional Conveyance Channel and Basins were identified
by the Review Committee as Priority 1 projects. Advanced land
acquisition for all basins is also identified as Priority 1. If basin sites are
not acquired quickly, the opportunity to implement the plan may be lost,
or modifications to the plan may need to be made.
Due to the length of the Durango Regional Conveyance Channel and the
need to construct the channel segments from downstream to upstream,
it is important to quickly obtain cooperation between the multiple land
owners, developers, and jurisdictions. Additionally construction phasing
will be required based on available funding and other projects which are
proceeding immediately. The first phase of the project is expected to be
Reach 1, the portion between the outfall at the Agua Fria River and 107 th
Avenue, which is within the City of Avondale. The second phase of the
project is expected to be Reach 2, the portion between 107 th Avenue and
75 th Avenue, which is within the City of Phoenix. The third and last
phase of the system is expected to be Reach 3, the portion between 75 th
Avenue, and 63 rd Avenue, which is within the City of Phoenix. A
potential modification to this phasing is described below with the 75 th
Avenue Preliminary Storm Drain Study.
A portion of Reach 1 may be constructed in conjunction with new
developments within the Lakin Cattle Company property currently being
master planned for residential and commercial development. A portion
of Reach 2 may be constructed in conjunction with the Tuscano
development at 75 th Avenue and Lower Buckeye Road as well as
improvements to the Country Place development at 99 th Avenue and
Lower Buckeye Road. A portion of Reach 3 may be constructed in
conjunction with a City of Phoenix Storm Drain project along 75 th
Avenue as described below.
75 th Avenue Preliminary Storm Drain Study
The concept of incorporating the 75 th Avenue City of Phoenix Storm
Drain project into a portion of the ADMP was developed to determine
the feasibility of an interim drainage concept that beneficially utilizes
the proposed City of Phoenix storm drain to allow implementation of
certain features of the Durango ADMP prior to completion of the
ultimate system outfall at the Agua Fria River. This analysis concludes
that DRC basin #4 could be up sized and the flow-by channel along the
basin could be redirected to a lateral storm drain that connects to the
proposed City of Phoenix storm drain system, thus assisting in
implementing a portion of the ADMP and still alleviating local flooding
problems. A copy of the 75 th Avenue Preliminary Storm Drain Study
can be found in Appendix H.
2. Durango Regional Outfall System
The Durango Regional Outfall Channel, Basins and Laterals were
identified by the Review Committee as Priority 1 projects. Advanced
land acquisition for all basins is also identified as Priority 1. If basin
sites are not acquired quickly, the opportunity to implement the plan
may be lost, or modifications to the plan may need to be made.
3. Sunland Avenue System
The Sunland Avenue Channel was identified as a replacement to the
previously identified “91 st Avenue Channel” because it better
accomplished the task of alleviating the floodplain. The 91 st Avenue
Channel was previously identified as a Priority 2 project by the Review
Committee and as such the Sunland Avenue System is designated a
Priority 2 project.
DIBBLE & ASSOCIATES 45 DURANGO AREA DRAINAGE MASTER PLAN
August 2002
RECOMMENDED DESIGN REPORT