WATERSHED STUDY 01
Choose the land covers before the storms. Keep every forecast within its limits.
Changing a cover updates every storm forecast.
Less runoff does not mean safe water. This game tracks water quantity. Sediment, pollutants and drinking-water safety are outside this model.
Plan your surfaces, inspect the storm sequence, and check the whole watershed.
Choose a land cover for each fictional plot before the storm sequence begins. The same plan must meet the budget and every storm’s runoff limit.
Each plot has finite soil storage. Water already in the soil leaves less room for the next storm.
Your cover plan changes the forecasts immediately. Inspect each storm to follow the water through the sequence.
Water quality is outside this model. Any plan meeting all the quantity requirements is accepted.
3 stars: no unsuccessful checks or hints. 2 stars: up to two unsuccessful checks, no hints. 1 star: every completed study. Undo and reset keep check and hint history. Best stars save on this device when storage is available.
Rain can infiltrate the ground or flow over the surface. Soil conditions, existing saturation and land cover affect that balance. Paved surfaces often send more water into rapid runoff, while soil can accept water only under its available conditions.
Percolark is a fictional, deterministic water-budget puzzle. Storage, infiltration and costs are authored lesson values, not calibrated predictions or design advice. All water quantities use model units.
Infiltration is a pathway into soil storage, not an additional final output. Water can drain from soil to named groundwater between storms; it does not disappear. The model has no evaporation, retained surface ponding or flow routing between plots.
Water quantity does not establish water quality. The game does not model sediment, dissolved pollutants, pathogens, water treatment or drinking safety.
USGS Water Science School: Surface Runoff and the Water Cycle and Infiltration and the Water Cycle. Numeric game rules are authored assumptions.
Original Blender character, watershed and cover models. Sound effects: Kenney Interface Sounds (CC0). Runtime: Three.js (MIT). Fonts: Manrope and IBM Plex Mono, Google Fonts.
60 studies in each of three courses, 180 total. Every study has at least one valid plan.