Hydrology — water balance

Each scenario screens the North Branch Portage 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.

baseline

Current municipal loop, no data-center cooling draw.

Cooling model: no cooling-water load

Cooling demand: 0 MGD · consumptive fraction 0 fraction

Consumptive lossmodeled

0cfs

0 MGD x 0 consumptive (scenario baseline)

[inference]

Binding dilutiongrounded

0.02:1

Bowling Green Water Pollution Control → Poe Ditch (Bowling Green WPC outfall, RM 2.5)

[verified]

Assimilative screen · 1 of 1 receiving reaches fail the dilution band at design low flow (Bowling Green Water Pollution Control chronic 0.02:1, acute 0.02:1). 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.

Tier-0 water balance · 1 nodes · modeling caveats:

no abstraction node configured for site 'bowling-green'; the water balance omits the intake reach.

buildout

Data-center campus cooling draw (closed_loop_dry) on the municipal supply.

Cooling model: closed-loop dry / air-cooled (“closed loop”)