OP, I now understand your problem better. There is a device called a ditch witch, I believe these can be rented. These are designed to dig a narrow trench specifically for burying wires or cable. This could be a DIY or handyman project to 'dig' the trench and it should take 1 to 2 hours. IMHO, I would then install conduit end to end which would provide protection to the cable and allow for future replacement if necessary. At the low spot, I would dig out a hole sufficient for one of the 5 gallon buckets and use that yo hold the sump pump with a suitable cover. Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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