Drainage area

Calculation of the basin area

Basin area refers to the area surrounded by a watershed (or dam, gase) section, generally referring to water Area, its units in km 2 . Generally, the watershed wire is the ridgeline of the watershed. The area covered by the watershed is the scope of the basin; when the graphics are not standardized, the flow rate is generally calculated, and the gravid area accounts for the gravity, multiplication I.e.

Drainage area

The relationship between the basin area and the storage capacity

The water level of the reservoir or the water storage capacity between the two water levels. Characterization of the main indicators of the scale of the reservoir. Usually, the stable reservoir is referred to as the water level of the dam. Calibrated flood (the water level of the relationship reservoir) refers to the total storage capacity; the test flood position and flood control limit water level (the reservoir in the flood season allows the super-limit water level in the flood level) to the flovement, When the flood control limit is changed in flood flood, refers to the library capacity between nuclear flood position and the lowest flood control limit; flooding high water level (when the downstream protective area is designed to design flood, the highest flood position reached by the reservoir) and flood control limit water levels It is called the flood control capacity. When the flood control limit is changed during flood prevention, it refers to the storage capacity of flood flood and lowest flood control; normal water storage level and dead water level (the reservoir is in normal application, the lowest water level allowed to fall) The reservoir has a reservoir, also known as the adjustment of the storage capacity, and in the normal application, the water can be used for water supply, irrigation, hydraulic power generation, shipping, etc., the normal water storage level and flood control restriction water level The volume is said to be a shared portion between flood control or flovement or flood storage capacity and Xingli's intersection; the reservoir below the dead water level is called dead storage, but also known as the bottom of the cushion, it does not participate in the runoff adjustment, only special circumstances such as war preparation, maintenance Allow emissions below. The retention value can be calculated from the topographic map, or the land-making method or section method can be used for field measurement, and then obtained.

Generally, the watershed area is relatively large.

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