0004458: Runoff streams start at bottom of lake, causing instant flooding and related Fun - Dwarf Fortress Bug Tracker

ID	Project	Category	View Status	Date Submitted	Last Update

0004458	Dwarf Fortress	World Generation -- General	public	2011-04-06 11:02	2015-03-15 10:14

Reporter	Kumquat	Assigned To
Priority	normal	Severity	minor	Reproducibility	sometimes
Status	new	Resolution	open
Platform	Windows	OS	XP64
Product Version	0.31.24

Summary	0004458: Runoff streams start at bottom of lake, causing instant flooding and related Fun
Description	Runoff streams (i.e. rivers starting from a lake) are created oddly. Sometimes they are "all right" if the lake is only one z-level deep, but quite often they start at the bottom of the lake, draining the lake very quickly (causing very low FPS and possibly Instant Fun). Sometimes there is also data corruption leading into whole map chunks of "inside" and sheer vertical drops. Another possibility is that lakes are forced flat and thus do not blend with surroundings nicely.
Steps To Reproduce	Reproducable example (causes weirdness at least in .24, generated from clean start). Original map is vanilla world gen, no modding at all apart from custom tile set and colors. Embark location: http://oi52.tinypic.com/nda8th.jpg World gen params: [WORLD_GEN] [TITLE:CREATE WORLD NOW = 4432454] [SEED:4110109300] [HISTORY_SEED:1170025084] [NAME_SEED:1296954456] [CREATURE_SEED:2349026128] [DIM:129:129] [EMBARK_POINTS:1274] [END_YEAR:550] [BEAST_END_YEAR:550:-1] [REVEAL_ALL_HISTORY:1] [CULL_HISTORICAL_FIGURES:0] [ELEVATION:1:400:1600:1600] [RAINFALL:0:100:200:200] [TEMPERATURE:25:75:200:200] [DRAINAGE:0:100:200:200] [VOLCANISM:0:100:200:200] [SAVAGERY:0:100:200:200] [ELEVATION_FREQUENCY:4:2:0:1:0:1] [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:3:1:2:3:4:5] [VOLCANISM_FREQUENCY:1:1:1:1:1:1] [MINERAL_SCARCITY:500] [MEGABEAST_CAP:27] [SEMIMEGABEAST_CAP:55] [TITAN_NUMBER:13] [TITAN_ATTACK_TRIGGER:80:0:100000] [DEMON_NUMBER:28] [NIGHT_CREATURE_NUMBER:28] [GOOD_SQ_COUNTS:6:63:0] [EVIL_SQ_COUNTS:6:63:0] [PEAK_NUMBER_MIN:3] [PARTIAL_OCEAN_EDGE_MIN:0] [COMPLETE_OCEAN_EDGE_MIN:4] [VOLCANO_MIN:1] [REGION_COUNTS:SWAMP:66:0:0] [REGION_COUNTS:DESERT:66:0:0] [REGION_COUNTS:FOREST:264:0:0] [REGION_COUNTS:MOUNTAINS:528:0:0] [REGION_COUNTS:OCEAN:528:0:0] [REGION_COUNTS:GLACIER:16:0:0] [REGION_COUNTS:TUNDRA:33:0:0] [REGION_COUNTS:GRASSLAND:528:0:0] [REGION_COUNTS:HILLS:528:0:0] [EROSION_CYCLE_COUNT:250] [RIVER_MINS:25:25] [PERIODICALLY_ERODE_EXTREMES:1] [OROGRAPHIC_PRECIPITATION:1] [SUBREGION_MAX:2750] [CAVERN_LAYER_COUNT:3] [CAVERN_LAYER_OPENNESS_MIN:0] [CAVERN_LAYER_OPENNESS_MAX:100] [CAVERN_LAYER_PASSAGE_DENSITY_MIN:0] [CAVERN_LAYER_PASSAGE_DENSITY_MAX:100] [CAVERN_LAYER_WATER_MIN:0] [CAVERN_LAYER_WATER_MAX:100] [HAVE_BOTTOM_LAYER_1:1] [HAVE_BOTTOM_LAYER_2:1] [LEVELS_ABOVE_GROUND:15] [LEVELS_ABOVE_LAYER_1:5] [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:5] [CAVE_MAX_SIZE:25] [MOUNTAIN_CAVE_MIN:15] [NON_MOUNTAIN_CAVE_MIN:22] [ALL_CAVES_VISIBLE:0] [SHOW_EMBARK_TUNNEL:2] [TOTAL_CIV_NUMBER:40] [TOTAL_CIV_POPULATION:15000] [SITE_CAP:780] [PLAYABLE_CIVILIZATION_REQUIRED:1] [ELEVATION_RANGES:8000:1056:528] [RAIN_RANGES:528:1056:528] [DRAINAGE_RANGES:528:1056:528] [SAVAGERY_RANGES:0:2080:4160] [VOLCANISM_RANGES:528:1056:528]
Additional Information	Have not tried in .25. Frequency is 'sometimes' because behavior of runoff streams is rather inconsistent in general sense. It probably isn't necessary to let history-gen run all the way to the end.
Tags	No tags attached.

Date Modified	Username	Field	Change
2011-04-06 11:02	Kumquat	New Issue
2012-02-17 07:50	~~user6~~	Relationship added	related to 0004500
2014-01-27 08:33	~~user6~~	Relationship added	related to 0006392
2015-03-15 10:14	gleechinese	Note Added: 0032381