{"id":3960,"date":"2021-02-24T14:08:21","date_gmt":"2021-02-24T22:08:21","guid":{"rendered":"https:\/\/www.marinrcd.org\/?page_id=3960"},"modified":"2022-05-04T15:09:18","modified_gmt":"2022-05-04T22:09:18","slug":"ditch-relief-culverts","status":"publish","type":"page","link":"https:\/\/www.marinrcd.org\/programs\/home2\/rural-roads\/ditch-relief-culverts\/","title":{"rendered":"Ditch Relief Culverts"},"content":{"rendered":"[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; background_image=&#8221;https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/02\/Panoramic-roads-cover-image-cropped-scaled.jpg&#8221; background_size=&#8221;contain&#8221; min_height=&#8221;163px&#8221; height=&#8221;152px&#8221; custom_margin=&#8221;-79px|||||&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row column_structure=&#8221;3_5,2_5&#8243; custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; width=&#8221;93%&#8221; max_width=&#8221;1103px&#8221; custom_margin=&#8221;-24px||||false|false&#8221; custom_margin_tablet=&#8221;&#8221; custom_margin_phone=&#8221;10px||||false|false&#8221; custom_margin_last_edited=&#8221;on|phone&#8221; custom_padding=&#8221;11px||||false|false&#8221; custom_padding_tablet=&#8221;&#8221; custom_padding_phone=&#8221;7px||||false|false&#8221; border_color_right=&#8221;#000000&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;3_5&#8243; _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;|300|||||||&#8221; text_text_color=&#8221;#000000&#8243; text_letter_spacing=&#8221;0.1px&#8221; text_line_height=&#8221;1.4em&#8221; header_font=&#8221;|700|||||||&#8221; header_text_color=&#8221;#AADB24&#8243; header_font_size=&#8221;28px&#8221; header_2_text_color=&#8221;#5B8500&#8243; header_4_font=&#8221;Work Sans||||||||&#8221; header_4_text_color=&#8221;#92CC00&#8243; custom_margin=&#8221;-26px|||||&#8221; global_colors_info=&#8221;{}&#8221;]\n<h1><a href=\"https:\/\/www.marinrcd.org\/rural-roads\"><strong>Rural Roads:<\/strong><\/a><\/h1>\n<h2><b>Ditch Relief Culverts<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">A ditch relief culvert (DRC) is a plastic, metal, or concrete pipe installed beneath the road surface to convey flow from an inside road ditch to an area beyond the outer edge of the road fill. When properly spaced, DRCs limit the quantity of water available to cause erosion at any single location, allowing flow to disperse and reducing the likelihood of gullies forming at their outlets. It is sometimes necessary to install downspouts or rock armor at DRC outlets to further dissipate energy and prevent erosion.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><br \/> <\/span><b>Considerations when installing d<\/b><b>itch relief culverts:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ditch relief culverts should be installed sufficiently before watercourse crossings so that water and sediment can be filtered through a vegetated slope before reaching the stream.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ditch relief culverts should be installed at intervals along the road that are close enough to prevent significant erosion of the ditch and below the culvert outfall on the native hillslope.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ditch relief culverts should be installed at locations where collected water and sediment is not discharged directly onto unstable areas or into watercourses.<\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 30px;\"><span style=\"font-weight: 400;\"><\/span><\/p>\n[\/et_pb_text][et_pb_text _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; text_text_color=&#8221;#5B8500&#8243; text_font_size=&#8221;13px&#8221; text_line_height=&#8221;1.1em&#8221; global_colors_info=&#8221;{}&#8221;]\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/02\/Ditch_Relief_Culvert_image.png\" width=\"1300\" height=\"760\" alt=\"On a brown, grassy landscape, a long, jagged-edged gully is shown at the outlet of a culvert.\" class=\"wp-image-3939 alignnone size-full\" srcset=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/02\/Ditch_Relief_Culvert_image.png 1300w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/02\/Ditch_Relief_Culvert_image-1280x748.png 1280w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/02\/Ditch_Relief_Culvert_image-980x573.png 980w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/02\/Ditch_Relief_Culvert_image-480x281.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 1300px, 100vw\" \/><\/p>\n<p><span data-contrast=\"none\" class=\"TextRun SCXW8889584 BCX0\" xml:lang=\"EN-US\" lang=\"EN-US\"><span class=\"NormalTextRun SCXW8889584 BCX0\">A long gully below the outlet of a ditch relief culvert delivering road runoff and eroded sediment to the downslope stream channel. The connected ditch is carrying too much flow and additional ditch relief culverts are needed up the road to break up the flow.<\/span><\/span><span class=\"EOP SCXW8889584 BCX0\" data-ccp-props=\"{&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n[\/et_pb_text][et_pb_text _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; text_text_color=&#8221;#000000&#8243; text_line_height=&#8221;1.1em&#8221; header_4_text_color=&#8221;#5B8500&#8243; global_colors_info=&#8221;{}&#8221;]\n<h4>Examples of inadequate ditch relief culvert frequency<\/h4>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_before.png\" width=\"1408\" height=\"943\" alt=\"From afar, a road on the side of a hill is shown. The hill is covered with small vegetation, so the gullies that formed at the site of 2 culverts are clearly visible as dirt cuts in the hillside.\" class=\"wp-image-4136 alignnone size-full\" srcset=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_before.png 1408w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_before-1280x857.png 1280w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_before-980x656.png 980w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_before-480x321.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 1408px, 100vw\" \/><\/p>\n<p><span>Two extremely large gullies formed entirely by long lengths of road draining to a ditch relief culvert. The gullies formed in succession, from right to left, as the landowner moved the location of the culvert when the road was beginning to be threatened by undercutting at each site.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_after.png\" width=\"1425\" height=\"950\" alt=\"At the same spot, a third culvert has been installed, and another gully has formed.\" class=\"wp-image-4135 alignnone size-full\" srcset=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_after.png 1425w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_after-1280x853.png 1280w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_after-980x653.png 980w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC-gullies_after-480x320.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 1425px, 100vw\" \/><\/p>\n<div class=\"a-q-Ed\" role=\"region\" aria-labelledby=\":9y.l\" tabindex=\"0\">\n<div class=\"a-q-Ed-oa-j\">\n<div class=\"a-q-Ed-j Ub-Lb\">\n<div class=\"a-q-Lb Lb-x\">\n<div class=\"a-q-Lb-go\"><span>A third extremely large gully formed entirely by long lengths of road draining to a ditch relief culvert. These erosional processes can be prevented by increasing drainage structure frequency to disperse road runoff, so there is never enough flow to cause significant rilling or gullying.<\/span><\/div>\n<div class=\"a-q-Lb-go\">\n<h4><\/h4>\n<h4><\/h4>\n<h4>Examples of techniques to reduce outlet erosion<\/h4>\n<\/div>\n<div class=\"a-q-Lb-go\"><span><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"a-q-Ed\" role=\"region\" aria-labelledby=\":9z.l\" tabindex=\"0\">\n<div class=\"a-q-Ed-oa-j\">\n<div class=\"a-q-Ed-Js-j\"><\/div>\n<div class=\"a-q-Ed-Js-j\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_mimum-10_.jpg\" width=\"378\" height=\"288\" alt=\"A backhoe and a person are shown with a half-buried culvert, demonstrating the angle of install.  \" class=\"wp-image-4139 alignnone size-full\" srcset=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_mimum-10_.jpg 378w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_mimum-10_-300x229.jpg 300w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span>A ditch relief culvert being installed. Culverts shall be installed at a 30 degree angle to the ditch with minimum 10 percent fall to lessen the chance of inlet erosion and plugging.<\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_energy-dissipation.jpg\" width=\"936\" height=\"607\" alt=\"A culvert near the top of a hill has rocks beneath its lip, where the water will spill out, reducing erosion potential.\" class=\"wp-image-4138 alignnone size-full\" srcset=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_energy-dissipation.jpg 936w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_energy-dissipation-480x311.jpg 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 936px, 100vw\" \/><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span>A ditch relief culvert that was not able to be installed at the base of fill, has energy dissipation (rock armor) installed at the outlet to reduce erosion potential.<\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_downspout.jpg\" width=\"912\" height=\"608\" alt=\"A culvert near the top of a hill has a long extension, so the water travels in the extension to the bottom of the hill, eliminating erosion potential.\" class=\"wp-image-4137 alignnone size-full\" srcset=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_downspout.jpg 912w, https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/DRC_downspout-480x320.jpg 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 912px, 100vw\" \/><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span><\/span><\/div>\n<div class=\"a-q-Ed-Js-j\"><span>A full round downspout attached to the outlet of a ditch relief culvert to reduce erosion potential on the steep outboard fillslope. Downspouts can be attached where installing the ditch relief culvert at the base of fill is not feasible.<\/span><\/div>\n<\/div>\n<\/div>\n[\/et_pb_text][et_pb_text _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; header_4_text_color=&#8221;#5B8500&#8243; global_colors_info=&#8221;{}&#8221;]\n<h4>What should I do about ditch relief culvert problems?<\/h4>\n<ul>\n<li>Contact the Marin RCD: call, email, or use the submission form in the sidebar of this page.<\/li>\n<li>Secure permits.\u00a0<span data-contrast=\"auto\" class=\"TextRun SCXW151961941 BCX0\" xml:lang=\"EN-US\" lang=\"EN-US\"><span class=\"NormalTextRun SCXW151961941 BCX0\">Permits may or may not be required to address ditch relief culvert problems depending on the project.\u00a0<\/span><\/span><\/li>\n<\/ul>\n<h4><a href=\"https:\/\/www.marinrcd.org\/rural-roads\/\"><span data-contrast=\"auto\" class=\"TextRun SCXW151961941 BCX0\" xml:lang=\"EN-US\" lang=\"EN-US\"><span class=\"NormalTextRun SCXW151961941 BCX0\">Back to Rural Roads Main Page<\/span><\/span><\/a><\/h4>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; text_line_height=&#8221;1.1em&#8221; header_2_text_color=&#8221;#5B8500&#8243; header_2_font_size=&#8221;22px&#8221; global_colors_info=&#8221;{}&#8221;]\n<h2>Quick Links<\/h2>\n<p><a href=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/Road-terminology-HANDBOOK-Steinfeld-et-al-2007-1.jpg\" target=\"_blank\" rel=\"noopener noreferrer\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\">Roads Terminology<\/a><\/p>\n<p><a href=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/PWA_Typicals_Drawings.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Construction Typicals Drawings<\/a><\/p>\n<p><a href=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/Characteristics-of-storm-proofed-roads-Weaver-et-al.-2006.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Characteristics of Storm-Proofed Roads<\/a><\/p>\n<p><a href=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/03\/Roads-Regulation-Info.docx-1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Roads Regulations and Permits<\/a><\/p>\n<p><a href=\"https:\/\/www.marinrcd.org\/wp\/wp-content\/uploads\/2021\/02\/FishNet_4C-roads-manual.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Impacts to Salmonids<\/a><\/p>\n<p><a href=\"https:\/\/www.marinrcd.org\/reference-library\" target=\"_blank\" rel=\"noopener noreferrer\">Useful Publications<\/a><\/p>\n[\/et_pb_text][et_pb_text _builder_version=&#8221;4.9.0&#8243; _module_preset=&#8221;default&#8221; text_text_color=&#8221;#5B8500&#8243; header_text_color=&#8221;#AADB24&#8243; header_2_text_align=&#8221;left&#8221; header_2_text_color=&#8221;#5B8500&#8243; header_2_font_size=&#8221;22px&#8221; min_height=&#8221;32px&#8221; global_colors_info=&#8221;{}&#8221;]\n<h2>How can I get help?<\/h2>\n[\/et_pb_text][et_pb_contact_form captcha=&#8221;off&#8221; email=&#8221;marinrcd@marinrcd.org&#8221; title=&#8221;RCD staff can work with you to assess erosion sources, develop improvement plans, and oversee implementation. 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