| 1 | Ice jam is a serious ice regime in the river of north China, which is formed generally during ice flow and frozen -up . | |
| 2 | Step 2. Frazil and mean discharge during freeze-up are estimated based on flow forecasting or design frequency of discharge. | |
| 3 | When freeze-up period is over, water level of Haibowan Reservoir can usually reach normal water level and in steady freeze-up period flow of Inner Mongolia reach is quite steady. |