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Here are some applications that have come in handy for plan review:

The Manning's equation solutions for open-channel uniform flow in a circular pipe are presented in a form. Open-Channel Circular Conduit Characteristics is an Internet Web form which tabulates the uniform-flow Manning's Equation normal, critical, and pipe-full values. The underlying routine, based upon V.T. Chow's geometric elements of circular channel sections, iteratively computes the flow angle, given flow rate and pipe characteristics.
Input and output values for street runoff and catch basin inlet interception can be interactively modified. Inlet on Grade is an Excel application which calculates the flow capacity of street sections and catch basins on continuous grade using the Modified Manning's Equation in accordance with HEC-12.
Print your own computation paper. Calcpad.pdf is an Acrobat .pdf file that will print engineering calculation paper.

Calcpad.gif is the graphic .gif file.
Some of the critical path activities in land development project municipal approval are flow-charted. process.pdf is an Acrobat Reader .pdf file attempting to display a city's land development permit approval process in a critical path PERT diagram. The activity boxes are a bit small, so zoom the screen display, or print on 11 x 17 inch paper in landscape mode. With regards to your project's specific schedule, individual results may vary...