0004458: Runoff streams start at bottom of lake, causing instant flooding and related Fun

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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

XP64

OS Version

Product Version

0.31.24

Target Version

Fixed in Version

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.