City of Wichita and Sedgwick County

Stormwater Manual for the City of Wichita and Sedgwick County — Volume 2, Technical Guidance — Chapter 1 Overview of Integrated Site Design

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Open source PDF ↗Official agency page ↗

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Source PDF is Volume 2 Chapter 1 only (~10 pages overview). WQv (1.2 in / 85th percentile / 80% TSS), CPv (1-year 24-hr / 2.8 in), and flood peak matching (2- through 100-year) are stated, but hydrologic calculation methods, software, detailed BMP design criteria, and document dates are deferred to other volumes/chapters not in this extract. Intermediate return periods between 2 and 100 years are required by "2-year through 100-year" language but not individually listed here.

Fields not found in document: document_metadata.adoption_or_effective_date, document_metadata.last_revised_date, design_criteria.peak_flow_calculation_method, design_criteria.required_hydrologic_hydraulic_software

Document Metadata

Jurisdiction level

municipality

“consistent with the stormwater policies adopted by the City of Wichita and Sedgwick County”
Section 1.1

State

Kansas

“City of Wichita and Sedgwick County”
Section 1.1

Version / edition

Volume 2, Technical Guidance, Chapter 1

“Volume 2, Technical Guidance Page 1 - i... CHAPTER 1”
Chapter 1 header

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“the stormwater policies adopted by the City of Wichita and Sedgwick County (and presented in Volume 1), and the stormwater management and floodplain regulations for each jurisdiction.”
Section 1.1

Design Criteria

Design storm return periods (years)

1-year, 2-year, 100-year

“The Channel Protection Volume (CPv) is the volume of temporary detention required to detain the development site runoff for the 1-year, 24-hour rain event (of 2.8")”
Table 1-1 / Section 1.3.3

Water quality volume method

Water Quality Protection Volume (WQv) is runoff from the 85th percentile rain event, identified as 1.2 inches of rainfall for Wichita/Sedgwick County (6-hour minimum dry interval). Treat WQv to remove 80% of TSS. Channel Protection Volume (CPv) is extended detention of the 1-year, 24-hour event (2.8 inches) for at least 24 hours centroid-to-centroid, or retain the pre-/post-development difference on-site.

“The Water Quality Protection Volume (WQv) is the volume of runoff from the development as a result of the 85th percentile rain event. In the Wichita and Sedgwick County area, this is the 1.2 inch rain event. Water quality protection must be achieved by treating the WQv to remove 80% of the total suspended solids”
Table 1-1 Step 1 / Section 1.3.2

Peak flow calculation method(s)

Not found in document

No evidence cited

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Preferred Site Design / non-structural practices (minimize impervious area, minimize soil disturbance, preserve natural areas, promote infiltration), Structural stormwater controls — detention, filtration, or infiltration (detention and retention ponds, constructed wetlands, bioretention areas, infiltration trenches, engineered swales)

“the controls consist of detention, filtration, or infiltration facilities that remove TSS from the runoff, and/or detain runoff for quantity control (CPv and floods). Examples include detention and retention ponds, constructed wetlands, bioretention areas, infiltration trenches, and engineered swales.”
Section 1.5