WASP and other flow and water quality models ask users to input multiplier and exponent values relating velocity and depth to discharge. These relationships take the form of V=aQ^b and depth=cQ^d, where the values a, b, c, and d describe the curve that approximates paired points from other sources. When paired field measurements are lacking, Manning's equation provides an estimate of open channel flow based on channel characteristics.

This app takes Manning's equation input variables and fits nonlinear least squares parameters to estimate a, b, c, and d over 20 equal increments of depth from 0.05 meters to the user specified maximum. The computations assume a symmetrical trapezoidal channel with continuous sloped sides.
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In 2014, EPA documented the relative lack of nutrient data from waste water treatment plant effluents, even though development of surface water quality standards for nitrogen and phosphorus has been a stated priority for more than a decade.

A new shiny app lets users explore effluent nutrient concentrations from an existing data set by waste water treatment plant type, and by nutrient of interest.
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I am an engineer working in water resources and the environmental field. On the side, I work with small businesses to help automate their data processing functions. I offer reasonable rates and am very efficient. Send me an e-mail at JYagecic@gmail.com
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