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Nibi Metrics

Real-time water levels, forecasts, and alerts for lakes and rivers across Canada and the US. Built on official government data.

Nibi Metrics turns raw gauge readings from official hydrometric networks into something a person standing on a dock can actually use: is the water high or low for today, which way is it moving, and how unusual is this? This page explains where every number on the platform comes from and what we do to it along the way.

Water Stories

The flood of record that was overtaken

For five years, spring 2019 was the mark every Lake Muskoka decision answered to. In April 2026 the lake went two centimeters higher - and the official books have not caught up yet.

Why the Assiniboine floods every spring

Inside the freshet cycle that puts Manitoba shorelines at risk each year - and why 2026 broke the script.

How snowpack becomes summer water

The science of snow water equivalent and why it drives the season ahead.

Reading a staff gauge like a hydrologist

What the numbers on the measuring stick actually tell you.

Flash Flood Alley: how Texas rivers rise in hours

Why Central and South Texas rivers go from gravel beds to fifty-year records in an afternoon - including July 2026 on the Nueces.

What a "100-year flood" actually means

One percent, every year, forever - unwrapping hydrology's most misunderstood phrase, and how it differs from our own percentiles.

Manoa-Palolo Drainage Canal at Moiliili, Oahu Water Level

Live river level, flow, historical records and forecast for Manoa-Palolo Drainage Canal at Moiliili, Oahu in HI, United States, built from official government gauge data.

About Manoa-Palolo Drainage Canal at Moiliili, Oahu

Manoa-Palolo Drainage Canal - A vital conduit on Oahu.

The Manoa-Palolo Drainage Canal at Moiliili is an important waterway on Oahu, capturing the rapid rainfall runoff in the region. As a drainage canal, it plays a crucial role in managing the often intense rainfall experienced on the island. Unlike many regions where snowmelt dictates flow patterns, Oahu’s hydrology is characterized by flash floods driven by heavy rainfall events.

The watershed context

The Manoa-Palolo Drainage Canal is part of Oahu's watershed, which encompasses an area of approximately 10.2 square miles upstream of the monitoring station. This catchment experiences significant shifts in water levels during periods of rain, responding rapidly to the island's tropical climate. Neighboring water bodies, such as Heeia Stream and Kalihi Stream, share this dynamic environment, highlighting the interconnected nature of Oahu’s water systems. Flash floods can occur in a matter of minutes, making monitoring data crucial for local residents and emergency management.

Why the data matters here

Today's reading from the Manoa-Palolo Drainage Canal is significant when compared to the historical median for this date. The U.S. Geological Survey (USGS) provides valuable insights into the water levels in this area, where understanding real-time conditions helps to inform local stakeholders, including residents and public safety officials. Utilizing this measurement alongside historical data allows for better preparation and response to potential flooding events. Monitoring the canal ensures that the community remains aware of changing conditions and can act accordingly.

How this page is built

Readings come from official government gauges and are rolled into daily records: the daily mean, high and low for every day on record. Each calendar day gets its own baseline from the full history, so the level you see is compared against what this specific date usually looks like rather than an annual average.

How Nibi Metrics works · Water stories