Common use of Storm Drains Clause in Contracts

Storm Drains. The Engineer shall provide the following services: a. Design and analyze storm drains using software as approved by the State. b. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the State’s Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Storm drain design software shall be selected as directed by the Work Authorization. DocuSign Envelope ID: 892480A0-816A-4F72-BEA4-A48D7E8902E6 c. Determine hydraulic grade line starting at the outfall channel for each storm drain design. Use the design water surface elevation of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system. d. Calculate manhole headlosses. Compute manhole head losses as per FHWA’s HEC-22. e. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate with the State any proposed changes to the detention systems. The State will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. Identify areas requiring trench protection, excavation, shoring, and de-watering.

Storm Drains. The Engineer shall provide the following services: a. 1. Design and analyze storm drains using software as approved by the State. b. 2. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the State’s Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Storm drain design software shall be selected as directed by the Work Authorization. 3. DocuSign Envelope ID: 892480A0-816A-4F72-BEA4-A48D7E8902E6 c. Determine hydraulic grade line starting at the outfall channel for each storm drain design. Use the design water surface elevation of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system.. DocuSign Envelope ID: 679175E2-1976-4615-BA79-40AD36929E37 d. 4. Calculate manhole headlosses. Compute manhole head losses as per FHWA’s HEC-22. e. 5. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate with the State any proposed changes to the detention systems. The State will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. 6. Identify areas requiring trench protection, excavation, shoring, and de-watering.

Storm Drains. The Engineer shall not evaluate the adequacy of the existing drainage structures to remain. Up to 30 inlets to be replaced or relocated shall be reviewed for adequacy. Broken inlets are to be replaced. For new inlets, provide the following services: a. 1. Design and analyze storm drains using software as approved by the StateCity/TxDOT. b. 2. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the StateTxDOT’s Hydraulic Design Manual, District criteria and any specific guidance provided by the StateCity/TxDOT. Storm drain design software shall be selected as directed by the Work Authorization. 3. DocuSign Envelope ID: 892480A0-816A-4F72-BEA4-A48D7E8902E6 c. Determine hydraulic grade line starting at the outfall channel for each storm drain design. Use the design water surface elevation of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system. d. 4. Calculate manhole headlosseshead-losses. Compute manhole head losses as per FHWA’s HEC-22HEC- 22. e. 5. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate Coordinate with the State City/TxDOT any proposed changes to the detention systems. The State City/TxDOT will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. 6. Identify areas requiring trench protection, excavation, shoring, and de-watering.

Storm Drains. The Engineer shall provide the following services: a. 1. Design and analyze storm drains using software as approved by the State. b. 2. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the State’s Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Storm drain design software shall be selected as directed by the Work AuthorizationState. 3. DocuSign Envelope ID: 892480A0-816A-4F72-BEA4-A48D7E8902E6 c. Determine hydraulic grade line (HGL) starting at the outfall channel for each storm drain design. Use the design water surface elevation Water Surface Elevation (WSEL) of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system.. DocuSign Envelope ID: 6F241E99-CBD7-4989-A074-6D52EF0E6522 Contract No. 14-6SDP5013 d. 4. Calculate manhole headlosseshead losses. Compute manhole head losses as per FHWA’s Hydraulic Engineering Circular-22 (HEC-22). e. 5. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline HGL throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate with the State any proposed changes to the detention systems. The State will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. 6. Identify areas requiring trench protection, excavation, shoring, and de-de- watering.

Storm Drains. The Engineer shall provide the following services: a. Design and analyze storm drains using software as approved by the State. b. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the State’s Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Storm drain design software shall be selected as directed by the Work Authorization. DocuSign Envelope ID: 892480A05410F844-816A-4F727202-BEA44C91-A48D7E8902E6B48D-AEAE41F0DC79 c. Determine hydraulic grade line starting at the outfall channel for each storm drain design. Use the design water surface elevation of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system. d. Calculate manhole headlosses. Compute manhole head losses as per FHWA’s HEC-22. e. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate with the State any proposed changes to the detention systems. The State will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. Identify areas requiring trench protection, excavation, shoring, and de-watering.

Storm Drains. The Engineer shall provide the following services: a. A. Design and analyze storm drains using software as approved by the State. b. B. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the State’s DocuSign Envelope ID: D0E29F2F-2A8C-4E32-A9B8-8EFA82530B8F Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Storm drain design software shall be selected as directed by the Work Authorization. DocuSign Envelope ID: 892480A0-816A-4F72-BEA4-A48D7E8902E6. c. C. Determine hydraulic grade line starting at the outfall channel for each storm drain design. Use the design water surface elevation of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system. d. D. Calculate manhole headlosses. Compute manhole head losses as per FHWA’s HEC-22. e. E. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate with the State any proposed changes to the detention systems. The State will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. F. Identify areas requiring trench protection, excavation, shoring, and de-watering.

Storm Drains. The Engineer shall provide the following services: a. Design and analyze storm drains using software as approved by the State. b. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the State’s Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Storm drain design software shall be selected as directed by the Work Authorization. DocuSign Envelope ID: 892480A0DB60124E-7585-816A-4F724844-BEA4AF91-A48D7E8902E6B8FDD08F857C c. Determine hydraulic grade line starting at the outfall channel for each storm drain design. Use the design water surface elevation of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system. d. Calculate manhole headlosses. Compute manhole head losses as per FHWA’s HEC-22. e. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate with the State any proposed changes to the detention systems. The State will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. Identify areas requiring trench protection, excavation, shoring, and de-watering.

Storm Drains. The Engineer shall provide the following services: a. Design and analyze storm drains using software as approved by the State. b. Size inlets, laterals, trunk line and outfall. Develop designs that minimize the interference with the passage of traffic or incur damage to the highway and local property in accordance with the State’s Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Storm drain design software shall be selected as directed by the Work Authorization. DocuSign Envelope ID: 892480A02136EF24-816A-4F7241E3-BEA4476A-9DE8-A48D7E8902E6B6DB65099AD1 c. Determine hydraulic grade line starting at the outfall channel for each storm drain design. Use the design water surface elevation of the outfall as the starting basis (tailwater) for the design of the proposed storm sewer system. d. Calculate manhole headlosses. Compute manhole head losses as per FHWA’s HEC-22. e. Limit discharge into existing storm drains and existing outfalls to the capacity of the existing system, which will be determined by the Engineer. Evaluate alternate flow routes or detention, if necessary, to relieve system overload. Determine the amount of the total detention storage to control storm drain runoff for the design frequency based on hydrograph routing for the full range of frequencies (50%, 20% 10%, 4%, 2%, 1%, and 0.2% AEP), as well as a rough estimate of the available on-site volume. When oversized storm drains are used for detention, the Engineer shall evaluate the hydraulic gradeline throughout the whole system, within project limits, for the design frequency or frequencies. The Engineer shall coordinate with the State any proposed changes to the detention systems. The State will assess the effects of such changes on the comprehensive drainage studies. f. Prepare conceptual 1% AEP sheet flow analysis for the project utilizing existing and proposed conditions if required in the Work Authorization. g. Identify areas requiring trench protection, excavation, shoring, and de-watering.