Ok Dushan, this is both absurd and hilarious to me, but.. turns out, it's possible to contrive this situation.
A method is: create an artificial world with two major rivers in it (33x33 or larger required, afaik) with different elevations. (I used 299 and 100 for maximum disparity)
Then you run those two major rivers into each other, adjacent to an ocean elevation of 1.
What happens is, and this is the kind of absurd/buggy part, it will run the higher elevation river
below the lower elevation river, where they meet.
So, to be extremely clear, what I've got here is two major rivers:
One approaching from the north being elevation 299.
One running west to east being elevation 100.
In the tile where they meet, the north river (elevation 299) is lower than the west->east river (elevation 100).
The 100 elevation river is the waterfall, flowing off a cliff, down into the elevation 299 river.
I have no logical explanation, but it accomplishes what you were looking for, that is, a major river waterfall in a desert biome. (badlands in this embark, but that's just altering drainage)
In this case, it's one major river running into another major river, but I'm sure you could tweak it, if desired, to be different. As well, the seeds aren't anything special, you can remove them, and it will likely re-gen without rejections or problems.
Here's the details..
worldgenCreated in DF v0.47.05.
[WORLD_GEN]
[TITLE:33X33_2RIV]
[SEED:GEQgAosUiqOsKUEu4ukq]
[HISTORY_SEED:MyYYeg0eIQOw0QUOymYO]
[NAME_SEED:4yic4aoC8wEU0ysuIIQw]
[CREATURE_SEED:2gmO44M4oMsOQecioCwG]
[DIM:33:33]
[EMBARK_POINTS:0]
[END_YEAR:200]
[BEAST_END_YEAR:200:-1]
[REVEAL_ALL_HISTORY:0]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:1:400:0:0]
[RAINFALL:0:100:0:0]
[TEMPERATURE:25:25:0:0]
[DRAINAGE:100:100:0:0]
[VOLCANISM:0:0:0:0]
[SAVAGERY:0:0:0:0]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[POLE:NONE]
[MINERAL_SCARCITY:100]
[MEGABEAST_CAP:0]
[SEMIMEGABEAST_CAP:0]
[TITAN_NUMBER:0]
[TITAN_ATTACK_TRIGGER:0:0:0]
[DEMON_NUMBER:0]
[NIGHT_TROLL_NUMBER:0]
[BOGEYMAN_NUMBER:0]
[NIGHTMARE_NUMBER:0]
[VAMPIRE_NUMBER:0]
[WEREBEAST_NUMBER:0]
[WEREBEAST_ATTACK_TRIGGER:0:0:0]
[SECRET_NUMBER:0]
[REGIONAL_INTERACTION_NUMBER:0]
[DISTURBANCE_INTERACTION_NUMBER:0]
[EVIL_CLOUD_NUMBER:0]
[EVIL_RAIN_NUMBER:0]
[GENERATE_DIVINE_MATERIALS:0]
[ALLOW_DIVINATION:0]
[ALLOW_DEMONIC_EXPERIMENTS:0]
[ALLOW_NECROMANCER_EXPERIMENTS:0]
[ALLOW_NECROMANCER_LIEUTENANTS:0]
[ALLOW_NECROMANCER_GHOULS:0]
[ALLOW_NECROMANCER_SUMMONS:0]
[GOOD_SQ_COUNTS:0:0:0]
[EVIL_SQ_COUNTS:0:0:0]
[PEAK_NUMBER_MIN:0]
[PARTIAL_OCEAN_EDGE_MIN:0]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:0]
[REGION_COUNTS:SWAMP:0:0:0]
[REGION_COUNTS:DESERT:0:0:0]
[REGION_COUNTS:FOREST:0:0:0]
[REGION_COUNTS:MOUNTAINS:0:0:0]
[REGION_COUNTS:OCEAN:0:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:0:0:0]
[REGION_COUNTS:HILLS:0:0:0]
[EROSION_CYCLE_COUNT:1000]
[RIVER_MINS:0:0]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:0]
[SUBREGION_MAX:5000]
[CAVERN_LAYER_COUNT:1]
[CAVERN_LAYER_OPENNESS_MIN:100]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:0]
[CAVERN_LAYER_WATER_MIN:25]
[CAVERN_LAYER_WATER_MAX:25]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:0]
[LEVELS_ABOVE_GROUND:8]
[LEVELS_ABOVE_LAYER_1:8]
[LEVELS_ABOVE_LAYER_2:1]
[LEVELS_ABOVE_LAYER_3:1]
[LEVELS_ABOVE_LAYER_4:1]
[LEVELS_ABOVE_LAYER_5:2]
[LEVELS_AT_BOTTOM:1]
[CAVE_MIN_SIZE:1]
[CAVE_MAX_SIZE:1]
[MOUNTAIN_CAVE_MIN:0]
[NON_MOUNTAIN_CAVE_MIN:0]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:1]
[TOTAL_CIV_POPULATION:0]
[SITE_CAP:0]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:0:0:0]
[RAIN_RANGES:0:0:0]
[DRAINAGE_RANGES:0:0:0]
[SAVAGERY_RANGES:0:0:0]
[VOLCANISM_RANGES:0:0:0]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400]
[PS_EL:400:299:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:299:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400]
[PS_EL:400:299:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:299:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400]
[PS_EL:400:299:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:299:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400]
[PS_EL:400:299:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:299:400:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:299:400:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:1:1]
[PS_EL:400:100:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:100:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:400]
[PS_EL:400:100:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:100:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:400]
[PS_EL:400:100:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:100:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:400]
[PS_EL:400:100:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_EL:400:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:400]
[PS_EL:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400:400]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0:0:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_RF:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:0]
[PS_RF:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
embarkstonesense
Also found this 2x1 embark, when refining the requirements/limits of this generation method..
worldgenCreated in DF v0.47.05.
[WORLD_GEN]
[TITLE:M-R-W2]
[SEED:k42c8o6oe0eSGsa8AYkk]
[HISTORY_SEED:ASwSgi4aqQeKoKUiCkoE]
[NAME_SEED:eGYckEWeG0gGUyoY8wO0]
[CREATURE_SEED:Awmym2g2cuYwQmGCCEom]
[DIM:33:33]
[EMBARK_POINTS:0]
[END_YEAR:200]
[BEAST_END_YEAR:200:-1]
[REVEAL_ALL_HISTORY:0]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:1:400:0:0]
[RAINFALL:0:100:0:0]
[TEMPERATURE:25:25:0:0]
[DRAINAGE:100:100:0:0]
[VOLCANISM:0:0:0:0]
[SAVAGERY:0:0:0:0]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[POLE:NONE]
[MINERAL_SCARCITY:100]
[MEGABEAST_CAP:0]
[SEMIMEGABEAST_CAP:0]
[TITAN_NUMBER:0]
[TITAN_ATTACK_TRIGGER:0:0:0]
[DEMON_NUMBER:0]
[NIGHT_TROLL_NUMBER:0]
[BOGEYMAN_NUMBER:0]
[NIGHTMARE_NUMBER:0]
[VAMPIRE_NUMBER:0]
[WEREBEAST_NUMBER:0]
[WEREBEAST_ATTACK_TRIGGER:0:0:0]
[SECRET_NUMBER:0]
[REGIONAL_INTERACTION_NUMBER:0]
[DISTURBANCE_INTERACTION_NUMBER:0]
[EVIL_CLOUD_NUMBER:0]
[EVIL_RAIN_NUMBER:0]
[GENERATE_DIVINE_MATERIALS:0]
[ALLOW_DIVINATION:0]
[ALLOW_DEMONIC_EXPERIMENTS:0]
[ALLOW_NECROMANCER_EXPERIMENTS:0]
[ALLOW_NECROMANCER_LIEUTENANTS:0]
[ALLOW_NECROMANCER_GHOULS:0]
[ALLOW_NECROMANCER_SUMMONS:0]
[GOOD_SQ_COUNTS:0:0:0]
[EVIL_SQ_COUNTS:0:0:0]
[PEAK_NUMBER_MIN:0]
[PARTIAL_OCEAN_EDGE_MIN:0]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:0]
[REGION_COUNTS:SWAMP:0:0:0]
[REGION_COUNTS:DESERT:0:0:0]
[REGION_COUNTS:FOREST:0:0:0]
[REGION_COUNTS:MOUNTAINS:0:0:0]
[REGION_COUNTS:OCEAN:0:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:0:0:0]
[REGION_COUNTS:HILLS:0:0:0]
[EROSION_CYCLE_COUNT:0]
[RIVER_MINS:0:0]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:0]
[SUBREGION_MAX:5000]
[CAVERN_LAYER_COUNT:1]
[CAVERN_LAYER_OPENNESS_MIN:100]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:0]
[CAVERN_LAYER_WATER_MIN:25]
[CAVERN_LAYER_WATER_MAX:25]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:0]
[LEVELS_ABOVE_GROUND:8]
[LEVELS_ABOVE_LAYER_1:8]
[LEVELS_ABOVE_LAYER_2:1]
[LEVELS_ABOVE_LAYER_3:1]
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embark