Idaho
Idaho Catalog of Storm Water Best Management Practices
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April 2020 Idaho DEQ BMP catalog is voluntary statewide guidance that defers to local design standards; Table 5 and §3.6 supply default design-storm/WQv/hydrology methods when local standards are absent. Source text includes an explicit truncation marker ([... DOCUMENT TEXT TRUNCATED FOR LENGTH — middle sections omitted ...]) so many middle BMP fact sheets (roughly after rainwater harvesting design detail through later operational BMPs) were not available for review; TOC and early chapters plus §3.6 remain intact.
Document Metadata
“The Idaho Catalog of Storm Water Best Management Practices provides technical guidance for construction site design and selecting storm water best management practices (BMPs) as well as information on permitting requirements for storm water discharges in Idaho.”
Section 1 Introduction, Page 1
“Idaho Department of Environmental Quality Water Quality Division 1410 N. Hilton Boise, ID 83706”
Cover
“No. 10. http://vwrrc.vt.edu/swc/april_22_2010_update/DCR_BMP_Spec_No_10_DRY_SWALE_Fi nal_Draft_v1-8_04132010.htm Washington State Department of Ecology. 2012. Stormwater Management Manual for Western Washington. Lacey, WA. Publ. 12-10-030. http://www.ecy.wa.gov/programs/w”
p. 131
“This 2020 BMP catalog provides updated information on storm water regulations and provides additional technical information on selected BMPs.”
Section 1.2 Catalog Updates, Page 2
“No. 10. http://vwrrc.vt.edu/swc/april_22_2010_update/DCR_BMP_Spec_No_10_DRY_SWALE_Fi nal_Draft_v1-8_04132010.htm Washington State Department of Ecology. 2012. Stormwater Management Manual for Western Washington. Lacey, WA. Publ. 12-10-030. http://www.ecy.wa.gov/programs/w”
p. 131
“This catalog contains voluntary controls that could be formally adopted by a jurisdiction to establish standards... it is not all-inclusive and should be used with other reference sources published by other agencies as appropriate based on local conditions and policies.”
Section 1 Introduction / 1.1 Goals and Objectives, Pages 1–2
Design Criteria
“While the most frequently used design for flood control and channel protection are the 2-, 10-, and 100-year storms... Table 5. Design storm frequencies... 1 year... 2 year... 10 year... 100 year Used for flood control protection from major storms”
Table 5 and Section 3.6.1, Pages 52–53
“Use local design standards for flood control and water quality control. If local design standards are not available, Table 5 provides a summary... 1/2 to <1-inch rainfall Intended to capture 70%–80% of annual runoff volume... 1-inch rainfall Intended to capture 90% of annual runoff volume... jurisdictions specify a treatment volume, referred to as the water quality volume... first 1/2-inch, 1-inch, or other rainfall depth... or... 6-month, 1-year, or 2-year frequency storm... must have 80% of suspended solids removed”
Sections 3.6 / 3.6.2 and Table 5, Pages 52–53
“The rational method and NRCS Technical Release-55 (TR-55) method are simple and widely used for performing single event design storm analysis... continuous simulation models... HSPF... HEC-HMS, and... SWMM... For rain-on-snow events, an energy balance approach using a computer model such as HEC-HMS is recommended... degree-day method”
Sections 3.6.3–3.6.3.2, Pages 53–59
No evidence cited
“and limitation information as well as design parameters, construction guidelines, and operation and maintenance recommendations. The most important requirements for successful performance of treatment control postconstruction facilities are proper sizing and regular inspection”
p. 41