750.2 Culverts - Revision history

Hoskir: /* 750.2.3.1 Inlet Control */

2023-09-21T16:22:53Z

750.2.3.1 Inlet Control

← Older revision		Revision as of 11:22, 21 September 2023
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	Inlet control exists when the headwater elevation depends on the culvert entrance configuration and the barrel is capable of conveying more flow than the inlet will accept. The properties of the inlet, such as the size, shape and edge treatment control the capacity of the culvert. The control section is at or just inside the culvert inlet. The water surface passes through critical depth at this location, and flow is supercritical in the culvert barrel immediately downstream.		Inlet control exists when the headwater elevation depends on the culvert entrance configuration and the barrel is capable of conveying more flow than the inlet will accept. The properties of the inlet, such as the size, shape and edge treatment control the capacity of the culvert. The control section is at or just inside the culvert inlet. The water surface passes through critical depth at this location, and flow is supercritical in the culvert barrel immediately downstream.

	When a culvert is operating under inlet control the barrel of the culvert has a greater hydraulic capacity than the inlet ~~does~~. For this reason the capacity of the culvert is dependent only upon the inlet properties and is independent of barrel properties. Under inlet control the culvert behaves as an orifice.		When a culvert is operating under inlet control the barrel of the culvert has a greater hydraulic capacity than the inlet. For this reason the capacity of the culvert is dependent only upon the inlet properties and is independent of barrel properties. Under inlet control the culvert behaves as an orifice.

	Nomographs have been developed which provide a headwater-discharge relation for culverts operating under inlet control. These inlet control nomographs are based on an analysis of experimental data obtained from various sources and provides a direct solution to inlet control culvert flow. The following inlet control nomographs may be used in the design and analysis of culverts.		Nomographs have been developed which provide a headwater-discharge relation for culverts operating under inlet control. These inlet control nomographs are based on an analysis of experimental data obtained from various sources and provides a direct solution to inlet control culvert flow. The following inlet control nomographs may be used in the design and analysis of culverts.

Hoskir: /* 750.2.3.1 Inlet Control */

2023-09-21T16:21:42Z

750.2.3.1 Inlet Control

← Older revision		Revision as of 11:21, 21 September 2023
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	Inlet control exists when the headwater elevation depends on the culvert entrance configuration and the barrel is capable of conveying more flow than the inlet will accept. The properties of the inlet, such as the size, shape and edge treatment control the capacity of the culvert. The control section is at or just inside the culvert inlet. The water surface passes through critical depth at this location, and flow is supercritical in the culvert barrel immediately downstream.		Inlet control exists when the headwater elevation depends on the culvert entrance configuration and the barrel is capable of conveying more flow than the inlet will accept. The properties of the inlet, such as the size, shape and edge treatment control the capacity of the culvert. The control section is at or just inside the culvert inlet. The water surface passes through critical depth at this location, and flow is supercritical in the culvert barrel immediately downstream.

	When a culvert is operating under inlet control the barrel of the culvert has a greater hydraulic capacity than ~~does~~ the inlet. For this reason the capacity of the culvert is dependent only upon the inlet properties and is independent of barrel properties. Under inlet control the culvert behaves as an orifice.		When a culvert is operating under inlet control the barrel of the culvert has a greater hydraulic capacity than the inlet does. For this reason the capacity of the culvert is dependent only upon the inlet properties and is independent of barrel properties. Under inlet control the culvert behaves as an orifice.

	Nomographs have been developed which provide a headwater-discharge relation for culverts operating under inlet control. These inlet control nomographs are based on an analysis of experimental data obtained from various sources and provides a direct solution to inlet control culvert flow. The following inlet control nomographs may be used in the design and analysis of culverts.		Nomographs have been developed which provide a headwater-discharge relation for culverts operating under inlet control. These inlet control nomographs are based on an analysis of experimental data obtained from various sources and provides a direct solution to inlet control culvert flow. The following inlet control nomographs may be used in the design and analysis of culverts.

Hallej1 at 15:11, 30 August 2022

2022-08-30T15:11:34Z

← Older revision		Revision as of 10:11, 30 August 2022
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	\|'''Concrete Box Culvert, GFRP'''		\|'''Concrete Box Culvert, GFRP'''
	\|-		\|-
	\|[ https://spexternal.modot.mo.gov/sites/cm/CORDT/RDT01016.pdf Report 2001]		\|[https://spexternal.modot.mo.gov/sites/cm/CORDT/RDT01016.pdf Report 2001]
	\|-		\|-
	\|'''See also:''' [https://www.modot.org/research-publications Research Publications]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]

Hallej1 at 15:04, 30 August 2022

2022-08-30T15:04:56Z

← Older revision		Revision as of 10:04, 30 August 2022
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	\|'''Concrete Box Culvert, GFRP'''		\|'''Concrete Box Culvert, GFRP'''
	\|-		\|-
	\|[~~http~~://~~library~~.modot.mo.gov/~~RDT~~/~~reports~~/~~RI99028~~/~~RDT01016a~~.pdf Report 2001]		\|[ https://spexternal.modot.mo.gov/sites/cm/CORDT/RDT01016.pdf Report 2001]
	\|-		\|-
	\|'''See also:''' [https://www.modot.org/research-publications Research Publications]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]

Smithk: Updated website link for increased security

2021-10-25T14:24:27Z

Updated website link for increased security

← Older revision		Revision as of 09:24, 25 October 2021
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	==750.2.11 Data Required on Plans==		==750.2.11 Data Required on Plans==
	In addition to the type, size and length of the culvert certain design data are shown on the construction plans for crossroad culverts. This data can also be provided for entrance culverts when deemed appropriate. Among these data are the drainage area of the watershed, the design discharge, the [~~http~~://epg.modot.org/index.php?title=Category:749_Hydrologic_Analysis#749.2.1_Design_Frequency_Criteria design frequency] and the [[:Category:749 Hydrologic Analysis#749.2.3 Overtopping Flood\|overtopping flood]]. The following is an example of how these data may be presented on the plans:		In addition to the type, size and length of the culvert certain design data are shown on the construction plans for crossroad culverts. This data can also be provided for entrance culverts when deemed appropriate. Among these data are the drainage area of the watershed, the design discharge, the [https://epg.modot.org/index.php?title=Category:749_Hydrologic_Analysis#749.2.1_Design_Frequency_Criteria design frequency] and the [[:Category:749 Hydrologic Analysis#749.2.3 Overtopping Flood\|overtopping flood]]. The following is an example of how these data may be presented on the plans:

	:D.A. = 70 ac.		:D.A. = 70 ac.

Smithk at 20:13, 18 August 2020

2020-08-18T20:13:14Z

← Older revision		Revision as of 15:13, 18 August 2020
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	\|[http://library.modot.mo.gov/RDT/reports/RI99028/RDT01016a.pdf Report 2001]		\|[http://library.modot.mo.gov/RDT/reports/RI99028/RDT01016a.pdf Report 2001]
	\|-		\|-
	\|'''See also:''' [~~http~~://www.modot.~~gov~~/~~services/OR/byDate.htm Innovation Library~~]		\|'''See also:''' [https://www.modot.org/research-publications Research Publications]
	\|}		\|}
	==750.2.1 General==		==750.2.1 General==

EPGsysop: Per BR, revised to correlate with 4/9/2015 EPG 750.7.3 Corps of Engineers Regional Condition affecting culvert design revision

2017-04-07T14:08:24Z

Per BR, revised to correlate with 4/9/2015 EPG 750.7.3 Corps of Engineers Regional Condition affecting culvert design revision

← Older revision		Revision as of 09:08, 7 April 2017
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	*Design Discharge, Q, ft<sup>3</sup>/s		*Design Discharge, Q, ft<sup>3</sup>/s
	* Bankfull Discharge, Q<sub>bkf</sub>, ft<sup>3</sup>/s
	*Allowable Headwater depth, AHW, ft.		*Allowable Headwater depth, AHW, ft.
	*Type of culvert		*Type of culvert
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	The design discharge is obtained by means of a hydrologic analysis of the watershed being drained using the guidance in [[:Category:749 Hydrologic Analysis#749.2.1 Design Frequency Criteria\|EPG 749.2.1 Design Frequency Criteria]].		The design discharge is obtained by means of a hydrologic analysis of the watershed being drained using the guidance in [[:Category:749 Hydrologic Analysis#749.2.1 Design Frequency Criteria\|EPG 749.2.1 Design Frequency Criteria]].

	~~For determination of bankfull discharge see, [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements\|EPG 750.7.3 Environmental Requirements]].~~

	The allowable [[748.4 Headwater and Backwater#748.4.1 Headwater\|headwater]] depth is defined as the maximum depth of water which may be allowed at the culvert inlet.		The allowable [[748.4 Headwater and Backwater#748.4.1 Headwater\|headwater]] depth is defined as the maximum depth of water which may be allowed at the culvert inlet.
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	::b. For outlet control use V = Q/A.		::b. For outlet control use V = Q/A.

	:STEP 6. Compute average velocity within culvert for [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements\|bankfull discharge]]. If average velocity is not similar to velocities upstream and downstream of culvert, increase culvert size and go to Step 3.

	==750.2.10 HY-8 Culvert Analysis==		==750.2.10 HY-8 Culvert Analysis==
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	Below are the data required for HY-8 culvert calculations.		Below are the data required for HY-8 culvert calculations.

	'''Discharges''' - Both the design discharge and a maximum discharge are required inputs~~. Input the [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements\|bankful discharge]] as the minimum discharge~~. HY-8 will compute a hydraulic performance curve for a range of discharges based on the minimum and maximum discharges, and will also perform calculations for the design discharge.		'''Discharges''' - Both the design discharge and a maximum discharge are required inputs. HY-8 will compute a hydraulic performance curve for a range of discharges based on the minimum and maximum discharges, and will also perform calculations for the design discharge.

	'''Culvert Invert Data''' - The station and elevation for both the inlet and outlet inverts are used to determine the length of the culvert. Another option allows the input of information defining the embankment and streambed slopes. HY-8 will then use this information and the culvert height to compute the culvert length.		'''Culvert Invert Data''' - The station and elevation for both the inlet and outlet inverts are used to determine the length of the culvert. Another option allows the input of information defining the embankment and streambed slopes. HY-8 will then use this information and the culvert height to compute the culvert length.

Smithk: /* 750.2.11 Data Required on Plans */Per Bridge, added that flow line elevations may be below natural stream bottom.

2015-05-13T13:16:08Z

750.2.11 Data Required on Plans: Per Bridge, added that flow line elevations may be below natural stream bottom.

← Older revision		Revision as of 08:16, 13 May 2015
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	:Q<sub>OT</sub> = 200 cfs (50-year)		:Q<sub>OT</sub> = 200 cfs (50-year)

	The above indicates that the culvert provides drainage for 70 acres of land. the 25-year design flood peak is equal to 160 cfs and the road overtops at the 50-year flood equal to 200 cfs.		The above indicates that the culvert provides drainage for 70 acres of land, the 25-year design flood peak is equal to 160 cfs and the road overtops at the 50-year flood equal to 200 cfs.

	In addition to the above data, the elevation of the culvert flow line at the inlet and at the outlet should be shown on the profile portion of the plan-profile sheets.		In addition to the above data, the elevation of the culvert flow line at the inlet and at the outlet should be shown on the profile portion of the plan-profile sheets. These elevations may be below the natural stream bottom in accordance with [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements\|EPG 750.7.3 Environmental Requirements]].

	The [[748.6 High Water Surface Elevation\|design flood elevation]] is shown on the profile portion of the plan-profile sheets, at locations where discharges of 500 cfs or more are potentially present, and at other locations where special consideration is required of inlet and erosion control problems.		The [[748.6 High Water Surface Elevation\|design flood elevation]] is shown on the profile portion of the plan-profile sheets, at locations where discharges of 500 cfs or more are potentially present, and at other locations where special consideration is required of inlet and erosion control problems.

Smithk: /* 750.2.11 Data Required on Plans */ Per Bridge, replaced "design high water elevation" with "design flood elevation"

2014-12-02T13:40:52Z

750.2.11 Data Required on Plans: Per Bridge, replaced "design high water elevation" with "design flood elevation"

← Older revision		Revision as of 08:40, 2 December 2014
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	In addition to the above data, the elevation of the culvert flow line at the inlet and at the outlet should be shown on the profile portion of the plan-profile sheets.		In addition to the above data, the elevation of the culvert flow line at the inlet and at the outlet should be shown on the profile portion of the plan-profile sheets.

	The [[748.6 High Water Surface Elevation\|design ~~high water~~]] ~~elevation~~ is shown on the profile portion of the plan-profile sheets, at locations where discharges of 500 cfs or more are potentially present, and at other locations where special consideration is required of inlet and erosion control problems.		The [[748.6 High Water Surface Elevation\|design flood elevation]] is shown on the profile portion of the plan-profile sheets, at locations where discharges of 500 cfs or more are potentially present, and at other locations where special consideration is required of inlet and erosion control problems.

	For data requirements when Bridge Division is responsible for the plans, see [[750.7 Non-Hydraulic Considerations#750.7.4.3 Summary of Responsibilities\|EPG 750.7.4.3 Summary of Responsibilities]].		For data requirements when Bridge Division is responsible for the plans, see [[750.7 Non-Hydraulic Considerations#750.7.4.3 Summary of Responsibilities\|EPG 750.7.4.3 Summary of Responsibilities]].

Smithk: updated links

2014-06-10T19:47:30Z

updated links

← Older revision		Revision as of 14:47, 10 June 2014
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	:STEP 1. Assemble Design Data.		:STEP 1. Assemble Design Data.

	:STEP 2. Assume a culvert size then adjust the size of the culvert by means of inlet control computations and [[750.7 Non-Hydraulic Considerations#750.7.3.3 Environmental Requirements ~~for Culverts~~\|environmental requirements for culverts]]. The smallest size culvert which will meet environmental requirements and pass the design flow rate at or below the allowable headwater depth is selected as the trial culvert size.		:STEP 2. Assume a culvert size then adjust the size of the culvert by means of inlet control computations and [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements\|environmental requirements for culverts]]. The smallest size culvert which will meet environmental requirements and pass the design flow rate at or below the allowable headwater depth is selected as the trial culvert size.

	:STEP 3. Find the actual Headwater Depth "HW", for trial culvert.		:STEP 3. Find the actual Headwater Depth "HW", for trial culvert.
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	::b. For outlet control use V = Q/A.		::b. For outlet control use V = Q/A.

	:STEP 6. Compute average velocity within culvert for [[750.7 Non-Hydraulic Considerations#750.7.3.3 Environmental Requirements ~~for Culverts~~\|bankfull discharge]]. If average velocity is not similar to velocities upstream and downstream of culvert, increase culvert size and go to Step 3.		:STEP 6. Compute average velocity within culvert for [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements\|bankfull discharge]]. If average velocity is not similar to velocities upstream and downstream of culvert, increase culvert size and go to Step 3.

	==750.2.10 HY-8 Culvert Analysis==		==750.2.10 HY-8 Culvert Analysis==
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	Below are the data required for HY-8 culvert calculations.		Below are the data required for HY-8 culvert calculations.

	'''Discharges''' - Both the design discharge and a maximum discharge are required inputs. Input the [[750.7 Non-Hydraulic Considerations#750.7.3.3 Environmental Requirements ~~for Culverts~~\|bankful discharge]] as the minimum discharge. HY-8 will compute a hydraulic performance curve for a range of discharges based on the minimum and maximum discharges, and will also perform calculations for the design discharge.		'''Discharges''' - Both the design discharge and a maximum discharge are required inputs. Input the [[750.7 Non-Hydraulic Considerations#750.7.3 Environmental Requirements\|bankful discharge]] as the minimum discharge. HY-8 will compute a hydraulic performance curve for a range of discharges based on the minimum and maximum discharges, and will also perform calculations for the design discharge.

	'''Culvert Invert Data''' - The station and elevation for both the inlet and outlet inverts are used to determine the length of the culvert. Another option allows the input of information defining the embankment and streambed slopes. HY-8 will then use this information and the culvert height to compute the culvert length.		'''Culvert Invert Data''' - The station and elevation for both the inlet and outlet inverts are used to determine the length of the culvert. Another option allows the input of information defining the embankment and streambed slopes. HY-8 will then use this information and the culvert height to compute the culvert length.