Each scenario screens the Great Miami River's low-flow capacity against the
campus's consumptive cooling draw: live flow minus consumptive loss against
the 7Q10 design low flow, and the assimilative headroom that remains. Live
gauge and permit figures are grounded; scenario draws are
labelled assumptions.
The screen above is the surface-water constraint. Its groundwater peer — the
area well concerns: the hypothetical drawdown cone, the documented
construction-dewatering wellfield and the domestic wells it drew down, and a screen of
the river record for where that pumped water went — has its own page.
A facility is documented here, but no record discloses how it rejects heat. The
consumptive water figure is therefore a range across candidate cooling
archetypes — 0 MGD (closed-loop dry) to 4 MGD (evaporative tower)
— not an estimate. A single headline would fabricate the site's most load-bearing
number; the section stays locked until the method is disclosed.
Ohio EPA "Fact Sheet for NPDES Permit Renewal, City of Sidney WWTP, 2022" (permit 1PD00009*SD, application OH0027421), Table 14 "Instream Conditions and Discharger Flow", printed p.32 — GMR above Sidney, 7Q10 annual 24.0 cfs, USGS gage #03261500, 1927-2021 data. Read from the source PDF text layer (data/documents/oepa/sidney/1PD00009.c43b66fd.pdf, 0-based page 80), digits clean; structured read at data/extracted/oepa/sidney/1PD00009.npdes.yaml.
[verified]
Binding dilutiongrounded
2.22:1
Sidney WWTP → Great Miami River (Sidney WWTP outfall, RM 128.68)
[verified]
Assimilative screen · 0 of 1 receiving reaches fail the dilution
band at design low flow (Sidney WWTP chronic 2.22:1, acute 1.79:1). The design flow is matched to the criterion type — chronic aquatic-life
dilution at the 7Q10, acute at the sharper 1Q10; the effluent-credited ratio counts the
permitted effluent already in the reach. A screening band, not a permit determination.