Add Evaporation Pond Model #1022

Job	Run time
Check code is formatted (Black)	11s
pytest (linux/3.8/editable)	12m 4s
pytest (linux/3.8/noneditable)	11m 10s
pytest (win64/3.8/editable)	19m 44s
pytest (win64/3.8/noneditable)	12m 59s
pytest (linux/3.9/editable)	10m 54s
pytest (linux/3.9/noneditable)	11m 0s
pytest (win64/3.9/editable)	20m 22s
pytest (win64/3.9/noneditable)	13m 0s
pytest (linux/3.10/editable)	8m 10s
pytest (linux/3.10/noneditable)	8m 24s
pytest (win64/3.10/editable)	20m 37s
pytest (win64/3.10/noneditable)	11m 36s
pytest (linux/3.11/editable)	7m 35s
pytest (linux/3.11/noneditable)	7m 20s
pytest (win64/3.11/editable)	13m 29s
pytest (win64/3.11/noneditable)	11m 9s
	3h 19m 44s

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