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The Plan



The 2019 SDMP update process began with research and data collection. It culminates with a broad vision for future drainage improvements that addresses multiple stakeholders’ needs and can be used as a reference document for years to come. In between, the process included technical analysis, engineering calculations, agency and public coordination, construction research, attention to the environment, and the use of sound judgement and common sense.


The process to develop this SDMP was accomplished in two phases.  Phase A established a “technical backbone,” where up-to-date hydrologic and hydraulic (H&H) engineering analysis provided the foundation for identifying drainage deficiencies and developing future needs across the City. Phase B’s efforts were focused on plan presentation, in both traditional and digital formats, making it usable to a variety of stakeholders.  The approach for this SDMP update includes the following tasks:

  • Hydrologic and Hydraulic Analysis. The most efficient and reliable way to determine the adequacy of a complex storm drainage network is through H&H modeling, where stormwater runoff rates and volumes are calculated for each drainage system.  The system’s capacity is also determined based on the City’s drainage criteria, and areas of deficiency are identified.
  • Recommended Improvements. To address areas where the existing system is deficient, proposed storm improvements are recommended to either supplement or replace existing systems.  The improvements are sized based on additional H&H modeling of the proposed systems. 
  • Cost Modeling. Planning level cost estimates are developed for each proposed improvement based on previously constructed drainage projects.
  • Stakeholder Outreach. During the entire planning process, members from each expected user group are consulted to ensure maximum comprehension and usability for the plan.
  • Documentation. In addition to traditional static report documentation, digital delivery of the plan’s analysis and recommendations is provided allowing for a tailored level of sophistication to each user group and providing a dynamic platform for post-adoption updating.

What’s New

This 2019 Storm Drainage Master Plan updates the previous 2014 publication through:

  • consistent application of the City’s drainage criteria 
  • inclusion of recently constructed projects
  • an update of regional precipitation (rainfall) distributions to current standards
  • enhancement of stormwater modeling efforts, to increase accuracy andbetter represent the capacity of existing and future stormwater systems 
  • an update and expansion of the Potential Inundation Area analysis 
  • Incorporation ing  of new UDFCD study recommendations since 2014
  • Revision of the configuration of proposed stormwater infrastructure based on updated analysis and efforts to gain efficiency utilizing the existing system
  • Revisions and updates  tothe cost analysis to better account for typical project costs and unforeseen factors
  • Development of a digital platform to provide easier access and better understanding of the plan to all users