Conclusion
The answer to the problem of digging basins in the fens "the sheer size and depth" of  the  broads  initially seemed to lie in a simple choice:  either conditions were so favourable  that the pits wouldn't have been subject to continual flooding,  or they were kept free of water mechanically. On those terms, if conditions weren't all that good, a pump or baling device must have been employed.

It  was  only  much later in their researches that Joyce Lambert and her colleagues became  acquainted  with  the  peculiar, impermeable properties of wet peat.   This renders the choice partly invalid.  With conditions no more favourable than today, and  without  using  a pump or baling device, it would have been perfectly possible to dig down to the same depth as the broads but over a much smaller area.

Excavations  "the sheer  size and  depth" of  the  broads  were  created  by joining together small, deep, adjacent pits, into one big one.
"It is a capital mistake to theorise ahead of the evidence."
A. Conan Doyle,
"The Second Stain."
On the other hand,

" . . . . . once you have eliminated the impossible, whatever remains, however improbable, must be the truth."
A. Conan Doyle,
"The Sign of Four."
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