MIDS (Minimal Impact Design Standards) Calculator

The calculator was developed to assist designers and regulators in determining conformance to the MIDS performance goals. The MIDS BMP calculator is a tool used to determine stormwater runoff volume and pollutant reduction capabilities of various low impact development (LID) BMPs.

The MIDS calculator estimates the stormwater runoff volume reductions for various BMPs based on the MIDS performance goal (1.1 inches of runoff off impervious surfaces) and annual pollutant load reductions for total phosphorus (including a breakdown between particulate and dissolved phosphorus) and total suspended solids (TSS).  The MIDS calculator is designed in Microsoft Excel with a graphical user interface (GUI), packaged as a windows application, used to organize input parameters. The Excel spreadsheet conducts the calculations and stores parameters, while the GUI provides a platform that allows the user to enter data and presents results in a user-friendly manner.  The MIDS calculator is divided into four main components: the “Site information” tab, “Schematic” tab, “BMP Properties” window, and “Results” tab. The “Site information” tab is where the user enters information for the entire site being studied.

This site has the link for downloading the Excel spreadsheet.

MIDS (Minimal Impact Design Standards) Calculator