DWR Dam Safety Jurisdictional Dam

A Jurisdictional Dam is a dam creating a reservoir with a capacity of more than 100 acre-feet, or creates a reservoir with a surface area in excess of 20 acres at the high-water line, or exceeds 10 feet in height measured vertically from the elevation of the lowest point of the natural surface of the ground where that point occurs along the longitudinal centerline of the dam up to the crest of the emergency spillway of the dam. For reservoirs created by excavation, or where the invert of the outlet conduit is placed below the surface of the natural ground at its lowest point beneath the dam, the jurisdictional height shall be measured from the invert of the outlet at the longitudinal centerline of the embankment or from the bottom of the excavation at the longitudinal centerline of the dam, whichever is greatest. Jurisdictional height is defined in Rule 4.2.19. The State Engineer shall have final authority over determination of the jurisdictional height of the dam.

管辖型水坝（Jurisdictional Dam）指满足以下任一条件的水坝：其形成的水库库容超过100英亩-英尺；或水库在高水位线处的表面积超过20英亩；或坝高从坝体纵向中心线处天然地面最低点的高程，垂直向上测量至坝体应急溢洪道的坝顶，高度超过10英尺。对于开挖形成的水库，或泄水管道（outlet conduit）的内底低于坝体下方天然地面最低点高程的情形，管辖型坝高应取两者中的较大值进行测量：一是坝体纵向中心线处泄水管道的内底高程，二是坝体纵向中心线处开挖基坑的底部高程。管辖型坝高的定义见第4.2.19条规则。州工程师对水坝管辖型坝高的判定拥有最终决定权。