{
 "domain": {
  "xmin": 0.0,
  "xmax": 25.0
 },
 "bed": "z = 0.2 − 0.05 (x − 10)² on 8 < x < 12, 0 elsewhere",
 "friction": "none",
 "g": 9.81,
 "upstream": {
  "wall": true
 },
 "downstream": {
  "wall": true
 },
 "initial": {
  "level_m": 0.1,
  "velocity_ms": 0.0
 }
}