【Daily Discussion】Public Utilities – Water Resources and Hydropower – 20210604
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What is the reason for dividing the spillway into a normal spillway and an emergency spillway? What standard floods do they each discharge? Answer: According to the flood discharge standards and operating conditions, spillways are divided into normal spillways and emergency spillways. The former is used to discharge design floods, while the latter is used to discharge extreme floods. Based on their location, they are divided into bed-type spillways and bank-side spillways. The riverbed spillway discharges water through the dam body. Spillways at the shore can be classified by structure into: ① main channel spillway. The spillway channel is orthogonal to the overflow weir, and the flow passing over the weir is in the same direction as the axis of the spillway channel. ②Side channel spillway. The spillways are arranged roughly along the contour lines; after the water flows from the spillways into side channels that are roughly parallel to the axis of the spillways, its direction changes by nearly 90°, and then it flows downstream through discharge channels or tunnels. ③Well-type spillway. The floodwater flows over the circular overflow weir and is discharged downstream through shafts and tunnels. ④Siphon spillway. Water is discharged using siphon action; after flowing out of the siphon tube, it moves downstream through a discharge channel. It can be installed on the shore or inside a dam. A bank spillway usually consists of an inlet channel, a control section, a discharge section, and a energy dissipation section. The inlet channel serves to supply water and regulate the flow rate. Control sections commonly use practical weirs or wide-crested weirs, with gates may or may not be provided on the weir crest. The water discharge section comes in two forms: chutes and tunnels. To protect the spillways from erosion and the rocks from weathering, they are generally lined with concrete. Energy dissipation sections often use tip discharge energy dissipation or hydraulic jump energy dissipation. When the discharged water flow cannot be directly directed into the original river channel, an additional tailwater channel must be established to ensure proper connection with the downstream river channel. The selection and layout of the spillway should be determined through technical and economic comparisons, taking into account factors such as the topography and geology of the dam site, the layout of the facility, and the construction conditions. Is this sentence correct? We welcome active participation in the discussions; the system offers generous rewards for answering questions from VIP members! ! !
According to the flood discharge criteria and operating conditions, spillways are divided into normal spillways and emergency spillways. The former is used to discharge design floods, while the latter is used to discharge extreme floods. Based on their location, they are divided into bed-type spillways and bank-side spillways. The riverbed spillway discharges water through the dam body. Spillways at the shore can be classified by structure into: ① main channel spillway. The spillway channel is orthogonal to the overflow weir, and the flow passing over the weir is in the same direction as the axis of the spillway channel. ②Side channel spillway. The spillways are arranged roughly along the contour lines; after the water flows from the spillways into side channels that are roughly parallel to the axis of the spillways, its direction changes by nearly 90°, and then it flows downstream through discharge channels or tunnels. ③Well-type spillway. The floodwater flows over the circular overflow weir and is discharged downstream through shafts and tunnels. ④Siphon spillway. Water is discharged using siphon action; after flowing out of the siphon tube, it moves downstream through a discharge channel. It can be installed on the shore or inside a dam. A bank spillway usually consists of an inlet channel, a control section, a discharge section, and a energy dissipation section. The inlet channel serves to supply water and regulate the flow rate. Control sections commonly use practical weirs or wide-crested weirs, with gates may or may not be provided on the weir crest. The water discharge section comes in two forms: chutes and tunnels. To protect the spillways from erosion and the rocks from weathering, they are generally lined with concrete. Energy dissipation sections often use tip discharge energy dissipation or hydraulic jump energy dissipation. When the discharged water flow cannot be directly directed into the original river channel, an additional tailwater channel must be established to ensure proper connection with the downstream river channel. The selection and layout of the spillway should be determined through technical and economic comparison, taking into account factors such as the topography and geology of the dam site, the layout of the hydraulic complex, and the construction conditions.
Based on the flood discharge requirements and operational conditions, spillways are divided into normal spillways and emergency spillways. The former are used to discharge design floods, while the latter are used to handle extreme floods. According to their location, they can be classified as bed spillways and bank spillways. Bed spillways discharge water through the dam body, whereas bank spillways can be further categorized by their structure: ① Main channel spillways, in which the discharge channel is perpendicular to the overflow weir, and the water flow moves in the same direction as the axis of the discharge channel. ② Side channel spillways, where the overflow weir is arranged roughly along the contour lines; the water flows from the weir into side channels that are parallel to the axis of the weir, then turns by nearly 90° before flowing downstream through discharge channels or tunnels. ③ Shaft spillways, in which floodwater passes through an annular overflow weir and is then discharged downstream via shafts and tunnels. ④ Siphon spillways, which utilize the siphoning effect to discharge water; after exiting the siphon tube, the water flows downstream through discharge channels. These can be built either on the bank or within the dam. Bank spillways typically consist of an inlet channel, a control section, a discharge section, and an energy dissipation section. The inlet channel serves to introduce water and regulate its flow. The control section often uses practical weirs or wide-crested weirs, with gates possibly present or not on the crest of the weir. The discharge section can take the form of discharge channels or tunnels. To protect the discharge channels from erosion and to prevent rocks from weathering, they are usually lined with concrete. Energy dissipation is achieved through methods such as overtopping or hydraulic jumps. When the discharged water cannot flow directly back into the original river channel, an additional tailrace channel is required to ensure proper connection with the downstream river channel. The selection and layout of spillways should be determined through technical and economic comparisons, taking into account factors such as the terrain and geology at the dam site, the overall layout of the facility, and construction conditions.
Based on the flood discharge requirements and operational conditions, spillways are divided into normal spillways and emergency spillways. The former are used to discharge design floods, while the latter are used to handle extreme floods. According to their location, they can be classified as bed spillways and bank spillways. Bed spillways discharge water through the dam body, whereas bank spillways can be further categorized by their structure: ① Main channel spillways, in which the discharge channel is perpendicular to the overflow weir, and the water flow moves in the same direction as the axis of the discharge channel. ② Side channel spillways, where the overflow weir is arranged roughly along the contour lines; the water flows from the weir into side channels that are parallel to the axis of the weir, then turns by nearly 90° before flowing downstream through discharge channels or tunnels. ③ Shaft spillways, in which floodwater passes through an annular overflow weir and is then discharged downstream via shafts and tunnels. ④ Siphon spillways, which utilize the siphoning effect to discharge water; after exiting the siphon tube, the water flows downstream through discharge channels. These can be built either on the bank or within the dam. Bank spillways typically consist of an inlet channel, a control section, a discharge section, and an energy dissipation section. The inlet channel serves to introduce water and regulate its flow. The control section often uses practical weirs or wide-crested weirs, with gates possibly present or not on the crest of the weir. The discharge section can take the form of discharge channels or tunnels. To protect the discharge channels from erosion and to prevent rocks from weathering, they are usually lined with concrete. Energy dissipation is achieved through methods such as overtopping or hydraulic jumps. When the discharged water cannot flow directly back into the original river channel, an additional tailrace channel is required to ensure proper connection with the downstream river channel. The selection and layout of spillways should be determined through technical and economic comparisons, taking into account factors such as the terrain and geology at the dam site, the overall layout of the facility, and construction conditions.
Based on the flood discharge requirements and operational conditions, spillways are divided into normal spillways and emergency spillways. The former are used to discharge design floods, while the latter are used to handle extreme floods. According to their location, they can be classified as bed spillways and bank spillways. Bed spillways discharge water through the dam body, whereas bank spillways can be further categorized by their structure: ① Main channel spillways, in which the discharge channel is perpendicular to the overflow weir, and the water flow moves in the same direction as the axis of the discharge channel. ② Side channel spillways, where the overflow weir is arranged roughly along the contour lines; the water flows from the weir into side channels that are parallel to the axis of the weir, then turns by nearly 90° before flowing downstream through discharge channels or tunnels. ③ Shaft spillways, in which floodwater passes through an annular overflow weir and is then discharged downstream via shafts and tunnels. ④ Siphon spillways, which utilize the siphoning effect to discharge water; after exiting the siphon tube, the water flows downstream through discharge channels. These can be built either on the bank or within the dam. Bank spillways typically consist of an inlet channel, a control section, a discharge section, and an energy dissipation section. The inlet channel serves to introduce water and regulate its flow. The control section often uses practical weirs or wide-crested weirs, with gates possibly present or not on the crest of the weir. The discharge section can take the form of discharge channels or tunnels. To protect the discharge channels from erosion and to prevent rocks from weathering, they are usually lined with concrete. Energy dissipation is achieved through methods such as overtopping or hydraulic jumps. When the discharged water cannot flow directly back into the original river channel, an additional tailrace channel is required to ensure proper connection with the downstream river channel. The selection and layout of spillways should be determined through technical and economic comparisons, taking into account factors such as the terrain and geology at the dam site, the overall layout of the facility, and construction conditions.
According to the flood discharge criteria and operating conditions, spillways are divided into normal spillways and emergency spillways. The former is used to discharge design floods, while the latter is used to discharge extreme floods.
Based on the flood discharge requirements and operational conditions, spillways are divided into normal spillways and emergency spillways. The former are used to discharge design floods, while the latter are used to handle extreme floods. According to their location, they can be classified as bed spillways and bank spillways. Bed spillways discharge water through the dam body, whereas bank spillways can be further categorized by their structure: ① Main channel spillways, in which the discharge channel is perpendicular to the overflow weir, and the water flow moves in the same direction as the axis of the discharge channel. ② Side channel spillways, where the overflow weir is arranged roughly along the contour lines; the water flows from the weir into side channels that are parallel to the axis of the weir, then turns by nearly 90° before flowing downstream through discharge channels or tunnels. ③ Shaft spillways, in which floodwater passes through an annular overflow weir and is then discharged downstream via shafts and tunnels. ④ Siphon spillways, which utilize the siphoning effect to discharge water; after exiting the siphon tube, the water flows downstream through discharge channels. These can be built either on the bank or within the dam. Bank spillways typically consist of an inlet channel, a control section, a discharge section, and an energy dissipation section. The inlet channel serves to introduce water and regulate its flow. The control section often uses practical weirs or wide-crested weirs, with gates possibly present or not on the crest of the weir. The discharge section can take the form of discharge channels or tunnels. To protect the discharge channels from erosion and to prevent rocks from weathering, they are usually lined with concrete. Energy dissipation is achieved through methods such as overtopping or hydraulic jumps. When the discharged water cannot flow directly back into the original river channel, an additional tailrace channel is required to ensure proper connection with the downstream river channel. The selection and layout of spillways should be determined through technical and economic comparisons, taking into account factors such as the terrain and geology at the dam site, the overall layout of the facility, and construction conditions.
According to the flood discharge criteria and operating conditions, spillways are divided into normal spillways and emergency spillways. The former is used to discharge design floods, while the latter is used to discharge extreme floods. Based on their location, they are divided into bed-type spillways and bank-side spillways. The riverbed spillway discharges water through the dam body. Spillways at the shore can be classified by structure into: ① main channel spillway. The spillway channel is orthogonal to the overflow weir, and the flow passing over the weir is in the same direction as the axis of the spillway channel. ②Side channel spillway. The spillways are arranged roughly along the contour lines; after the water flows from the spillways into side channels that are roughly parallel to the axis of the spillways, its direction changes by nearly 90°, and then it flows downstream through discharge channels or tunnels. ③Well-type spillway. The floodwater flows over the circular overflow weir and is discharged downstream through shafts and tunnels. ④Siphon spillway. Water is discharged using siphon action; after flowing out of the siphon tube, it moves downstream through a discharge channel. It can be installed on the shore or inside a dam. A bank spillway usually consists of an inlet channel, a control section, a discharge section, and a energy dissipation section. The inlet channel serves to supply water and regulate the flow rate. Control sections commonly use practical weirs or wide-crested weirs, with gates may or may not be provided on the weir crest. The water discharge section comes in two forms: chutes and tunnels. To protect the spillways from erosion and the rocks from weathering, they are generally lined with concrete. Energy dissipation sections often use tip discharge energy dissipation or hydraulic jump energy dissipation. When the discharged water flow cannot be directly directed into the original river channel, an additional tailwater channel must be established to ensure proper connection with the downstream river channel. The selection and layout of the spillway should be determined through technical and economic comparison, taking into account factors such as the topography and geology of the dam site, the layout of the hydraulic complex, and the construction conditions.
Based on the flood discharge requirements and operational conditions, spillways are divided into normal spillways and emergency spillways. The former are used to discharge design floods, while the latter are used to handle extreme floods. According to their location, they can be classified as bed spillways and bank spillways. Bed spillways discharge water through the dam body, whereas bank spillways can be further categorized by their structure: ① Main channel spillways, in which the discharge channel is perpendicular to the overflow weir, and the water flow moves in the same direction as the axis of the discharge channel. ② Side channel spillways, where the overflow weir is arranged roughly along the contour lines; the water flows from the weir into side channels that are parallel to the axis of the weir, then turns by nearly 90° before flowing downstream through discharge channels or tunnels. ③ Shaft spillways, in which floodwater passes through an annular overflow weir and is then discharged downstream via shafts and tunnels. ④ Siphon spillways, which utilize the siphoning effect to discharge water; after exiting the siphon tube, the water flows downstream through discharge channels. These can be built either on the bank or within the dam. Bank spillways typically consist of an inlet channel, a control section, a discharge section, and an energy dissipation section. The inlet channel serves to introduce water and regulate its flow. The control section often uses practical weirs or wide-crested weirs, with gates possibly present or not on the crest of the weir. The discharge section can take the form of discharge channels or tunnels. To protect the discharge channels from erosion and to prevent rocks from weathering, they are usually lined with concrete. Energy dissipation is achieved through methods such as overtopping or hydraulic jumps. When the discharged water cannot flow directly back into the original river channel, an additional tailrace channel is required to ensure proper connection with the downstream river channel. The selection and layout of spillways should be determined through technical and economic comparisons, taking into account factors such as the terrain and geology at the dam site, the overall layout of the facility, and construction conditions.
Based on the flood discharge requirements and operational conditions, spillways are divided into normal spillways and emergency spillways. The former are used to discharge design floods, while the latter are used to handle extreme floods. According to their location, they can be classified as bed spillways and bank spillways. Bed spillways discharge water through the dam body, whereas bank spillways can be further categorized by their structure: ① Main channel spillways, in which the discharge channel is perpendicular to the overflow weir, and the water flow moves in the same direction as the axis of the discharge channel. ② Side channel spillways, where the overflow weir is arranged roughly along the contour lines; the water flows from the weir into side channels that are parallel to the axis of the weir, then turns by nearly 90° before flowing downstream through discharge channels or tunnels. ③ Shaft spillways, in which floodwater passes through an annular overflow weir and is then discharged downstream via shafts and tunnels. ④ Siphon spillways, which utilize the siphoning effect to discharge water; after exiting the siphon tube, the water flows downstream through discharge channels. These can be built either on the bank or within the dam. Bank spillways typically consist of an inlet channel, a control section, a discharge section, and an energy dissipation section. The inlet channel serves to introduce water and regulate its flow. The control section often uses practical weirs or wide-crested weirs, with gates possibly present or not on the crest of the weir. The discharge section can take the form of discharge channels or tunnels. To protect the discharge channels from erosion and to prevent rocks from weathering, they are usually lined with concrete. Energy dissipation is achieved through methods such as overtopping or hydraulic jumps. When the discharged water cannot flow directly back into the original river channel, an additional tailrace channel is required to ensure proper connection with the downstream river channel. The selection and layout of spillways should be determined through technical and economic comparisons, taking into account factors such as the terrain and geology at the dam site, the overall layout of the facility, and construction conditions.
According to the flood discharge criteria and operating conditions, spillways are divided into normal spillways and emergency spillways. The former is used to discharge design floods, while the latter is used to discharge extreme floods. Based on their location, they are classified into riverbeds; spillways in hydraulic structures and their types. Spillways are flood control devices used in hydraulic structures such as reservoirs, and they are usually built on one side of a dam. Acting like large channels, they allow water to flow downstream when the water level in the reservoir exceeds safe limits, thereby preventing the dam from being damaged. Including: inlet channel, control section, drain channel, and outlet channel.