What IS 30% Design?

For purposes of Colorado watershed planning projects funded with CDBG-DR grants, DOLA/CWCB etc. defines 30% design as “the development of a plan set to a level of sufficient detail to evaluate major design features prior to advancing to the design/build phase or construction drawings. Individual components of a 30% design will vary depending on the reach and project goals. However, the CDBG-DR program dictates that 30% designs will provide clear direction for detailed project engineering and specifications to be completed in the future. In order for the projects to be eligible for funding in future CDBG-DR implementation grant cycles, the design work must 1) describe the science-based risk analysis it has employed in its design, and 2) identify resilience performance standards that can be applied to the projects upon completion of construction (See Federal Register, Vol. 79, No. 106, June 3, 2014). The following outline should be used as guidance.”

Referred to in the memo:
NRCS National Engineering Handbook, Stream Restoration Design (2007)

Full memo:
30% Design Memo

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