Aurora to seek study‑session review of a watershed hydrology update with Mile High Flood District
April 08, 2026 | Aurora City, Douglas County, Colorado
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Staff requested the committee 's support to advance an intergovernmental agreement with the Mile High Flood District to complete a comprehensive hydrology update for the entire Tollgate Creek watershed.
The presenter said the city has accumulated "Frankensteined" models from different consultants and technologies over years and that reconciling the basin‑scale models is necessary to provide reliable flood and drainage projections for planning. The proposed effort would cover the whole watershed rather than piecemeal master‑plan updates, addressing inconsistent subbasin boundaries and model discrepancies observed in recent projects.
The presenter described costs "split evenly between ourselves and Mile High Flood District at $150,000," and asked the committee to move the IGA forward to study session for council consideration. Committee members asked whether land cover and soil disturbances are considered in hydrology updates; staff confirmed redevelopment, land‑cover change and updated rainfall data are included.
The committee voted to advance the IGA to study session.
The presenter said the city has accumulated "Frankensteined" models from different consultants and technologies over years and that reconciling the basin‑scale models is necessary to provide reliable flood and drainage projections for planning. The proposed effort would cover the whole watershed rather than piecemeal master‑plan updates, addressing inconsistent subbasin boundaries and model discrepancies observed in recent projects.
The presenter described costs "split evenly between ourselves and Mile High Flood District at $150,000," and asked the committee to move the IGA forward to study session for council consideration. Committee members asked whether land cover and soil disturbances are considered in hydrology updates; staff confirmed redevelopment, land‑cover change and updated rainfall data are included.
The committee voted to advance the IGA to study session.
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