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[[file:Schematic used for calculating volumes.png|300px|thumb|alt=schematic for calculator calculations|<font size=3>Schematic used for determining inputs for the Underground infiltration BMP for the MIDS calculator.</font size>]] | [[file:Schematic used for calculating volumes.png|300px|thumb|alt=schematic for calculator calculations|<font size=3>Schematic used for determining inputs for the Underground infiltration BMP for the MIDS calculator.</font size>]] | ||
− | The Minimal Impact Design Standards calculator requires a user to input a value for water stored in an underground infiltration practice below the outflow (overflow) pipe and the top of the underlying soil or engineered media. This is not a straightforward calculation because there are a wide variety of underground pipe shapes and because two different calculations must be made - one for storage in the pipe and another for storage in the media surrounding the pipe. If engineered media is used in the practice, the calculator also requires a calculation of the surface area of the engineered media. This calculation is fairly simple. Both these calculations can be made using a spreadsheet developed for this purpose. | + | The [https://stormwater.pca.state.mn.us/index.php?title=MIDS_calculator Minimal Impact Design Standards calculator] requires a user to input a value for water stored in an underground infiltration practice below the outflow (overflow) pipe and above the top of the underlying soil or engineered media. This is not a straightforward calculation because there are a wide variety of underground pipe shapes and because two different calculations must be made - one for storage in the pipe and another for storage in the media surrounding the pipe. If engineered media is used in the practice, the calculator also requires a calculation of the surface area of the engineered media. This calculation is fairly simple. Both these calculations can be made using a spreadsheet developed for this purpose. Water storage in an underground system is shown in the schematic to the right. |
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[[file:Schematic hex or rectangle pipes.png|300px|thumb|alt=schematic for hex pipes|<font size=3>Schematic used for calculating volumes for hexagonal or rectangular pipes.</font size>]] | [[file:Schematic hex or rectangle pipes.png|300px|thumb|alt=schematic for hex pipes|<font size=3>Schematic used for calculating volumes for hexagonal or rectangular pipes.</font size>]] | ||
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==Calculating underground pipe storage volume (V<sub>P</sub>)== | ==Calculating underground pipe storage volume (V<sub>P</sub>)== | ||
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The Minimal Impact Design Standards calculator requires a user to input a value for water stored in an underground infiltration practice below the outflow (overflow) pipe and above the top of the underlying soil or engineered media. This is not a straightforward calculation because there are a wide variety of underground pipe shapes and because two different calculations must be made - one for storage in the pipe and another for storage in the media surrounding the pipe. If engineered media is used in the practice, the calculator also requires a calculation of the surface area of the engineered media. This calculation is fairly simple. Both these calculations can be made using a spreadsheet developed for this purpose. Water storage in an underground system is shown in the schematic to the right.