Some time ago I had to verify in a short time, different hypothesis for a sheet pile wall installation in a layered soil: fixing length and distance of the anchor from the surface. I have modified a BASIC program found in the Web, adapting it to my needs.
In the past I created a little BASIC program to help me in the design of a storm sewer system, using the linear reservoir model. I am going to publish my work, but first I will introduce briefly the theory linked to this one. The article won't be too didactic and detailed, to do this I put some links.
The storm sewer is designed to drain excess rain and ground water from paved streets, parking lots, sidewalks, and roofs to collect them in proper deliveries.
At the beginning for necessity: I needed a tool to speed and to check the exercises at the University, today I reduced drastically times in designing.
Sometimes a casual event leads to a surprising result, like the finding of an twelve years old calculator, a Sharp PC-E500S in the original box and yet in a good state of conservation.