Maumee basin
HUC-8 · 04100005 – 041000098 sites, one watershed. Fort Wayne's headwaters, the Auglaize and Blanchard confluences, the Ottawa River draw at Lima — every intake and outfall in the basin, read against one drainage. This is a lead, not a verdict: most of the basin has no filed water record yet, and a gap below is an open question, never a zero.
Every site, against the drainage it draws from
Schematic basin diagram — simplified from USGS HUC boundaries, not to scaleThe receiving system — one site at a time, stacked
4 of 8 sites carry an estimated facility load and 3 a screened facility record; none carries a filed draw volume — the water figure behind any projection is still open. The design flows above are the receiving plants' permitted capacity — the denominator any projected draw must be read against, not a measure of the draw itself. A projected basin total would be an open range, not a claim.
The 8 sites in this basin
The design-storm peak, routed — attenuated and lagged, not summed
The 25-yr, 24-hr design storm (4.25 in) generated at each contributing subcatchment and routed down the cited confluence graph. A downstream reach sees a peak that is attenuated and delayed — not the arithmetic sum of the tributary peaks a naive stack would give.
Tier-0 screening — constant-parameter Muskingum–Cunge over reach geometry + subcatchments that are cited where derivable (WBD watershed areas, Hack's-law channel lengths) and stated assumptions otherwise (slopes, curve numbers), not a calibrated HEC-RAS model. The attenuation + lag are robust to the absolute areas; the finding is that the routed peak is smaller and later than the sum, so a downstream reach is not sized by stacking tributary peaks.
Where the basin's outfalls actually are
The NPDES-permitted municipal outfalls that would receive any new load. 4 of 8 carry an assembled dilution screen; the rest discharge to ungaged tributaries or carry no ECHO receiving water — the gap is itself a finding. Each opens its site's record.