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City staff outline major updates to Lewisville drainage criteria manual, including downstream assessments and water-quality measures
Summary
Staff presented proposed revisions to the Drainage Criteria Manual: developer O&M plans to be filed with county, updated runoff software, new downstream assessment flowcharts, required riprap outfall treatments, revised open-channel slope standards, and expanded storm-event analyses to improve downstream protections and water quality.
City staff reviewed a proposed update to the Drainage Criteria Manual intended to modernize stormwater design standards and support the city's sustainability goals.
Presenters said the manual would require developers to submit an operations-and-maintenance plan (O&M) approved by staff and filed with the county to hold private drainage facilities accountable. The update allows current runoff-analysis software (the previous manual dated to 1988), introduces a…
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