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Enhance Floodplain/Remove, Modify, Breach Dike
Habitat Improvement | 180
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Definition
Refers to the removal, breaching, or alteration/set-back of a dike to restore riparian/floodplain or wetland habitat. This may also involve the installation of a tidegate or culvert. Also includes re-contouring of habitat to restore or enhance wetland or floodplain functionality and connectivity, as well as to allow for fish passage into previously blocked tributary habitat. If the wetland was created/restored/enhanced from fill removal, or a water control structure other than a tidegate or culvert is involved, use WE # 181: Create, Restore, and/or Enhance Wetland.
Deliverables (recommended)
- Completed enhancements to the specified areas of flood plain
Rules and Examples (work element scenarios and associated rules)
Rule 1: Do not include the NEPA/ESA consultation, cultural surveys, or O&M costs when budgeting for this work element. This work element only covers flood plain enhancement implementation.
Example: You're going to be breaching portions of a levee adjacent to Big River. Big River is populated with Bull Trout and there are Bald Eagle nests in the area. Big River flows adjacent to culturally sensitive areas.
Any ESA consultation, obtaining of permits, or cultural resource surveys that may be conducted prior to the start of work should be listed under WE #165 Produce Environmental Compliance Documentation.
WE: Enhance Floodplain
WE Title: Breaching Big River levee
WE: Produce Environmental Compliance Documentation
WE Title: Complete cultural survey for Big River levee breaching.
Rule 2: Each location where a dike or levee is to be constructed must be listed under its own work element, and the location should be included in the work element title field. Each location of any proposed breach in a dike or levee must be listed under its own work element. Any activity such as adding large woody debris (LWD) to the designated flood plain must also be listed under its own work element. You may use WE# 180, Enhance Floodplain as many times as necessary in a Statement of Work to identify different locations.
Example: Your plan calls for the breaching of the Smith Levee at two locations, then adding LWD to both flood plain areas. At the first location (site #1) closest to Big River you plan to breach Smith Levee by placing a culvert though the levee with a water control structure at its head for flood control. This breach action would be listed under its own work element. The addition of LWD (or roughness material) to the flood plain area behind this breach would also be listed under its own work element.
The second breach (site #2) is to occur more distant from Big River and involves the removal of materials from Smith levee. This action must be listed under its own work element. In addition the placement of LWD behind this breach must also be listed under its own work element. For all of these actions, use WE#180 Enhance Floodplain. You may use a work element as many times as necessary in a Statement of Work to identify different locations or actions.
WE: Enhance Floodplain
WE Title: Breach #1 Smith levee with water control structure at Big River.
Deliverable: Installed water control structure at Big River.
WE: Enhance Floodplain
WE Title: Breach #2 Smith levee and remove material.
Deliverable: Breach of Smith levee and removal of 6 cubic tons of material.
WE: Enhance Floodplain
WE Title: Add LWD at Big River site
Deliverable: Add LWD in 15 acre area (site #1)
WE: Enhance Floodplain
WE Title: Add LWD at Smith levee breach site #2.
Deliverable: Add and anchor down LWD in 5-acre area (site #2)
Milestones (may include)
- Environmental compliance requirements complete
On-the-ground work associated with this work element cannot proceed until this milestone is complete. Milestone is complete when final documentation is received from BPA environmental compliance staff (completion can be based on pre-existing environmental documentation from BPA).
- Produce site plan
Plan should include diagrams of features to be added or removed, excavation grades (if applicable) and listings of type and locations of all water control structures to be installed.
- Negotiations with land owners completed (if applicable)
- Obtain all permits, NEPA, ESA, etc. (if applicable)
- Subcontractor hired for implementation
- Materials for implementation obtained (if applicable)
- GIS recording of project area
Metrics
| Metric |
Metric Type |
Metric Guidance |
Metric
Required |
Metric
Type |
Metric
Precision |
| 1441 |
# of miles of habitat accessed to the next upstream barrier(s) or likely limit of habitable range |
Self-Explanatory |
Required |
number |
0.01 |
| 1517 |
# of acres of riparian non-wetland habitat treated |
Identify the total acres of habitat treated in this habitat zone. Riparian/Floodplain: A riparian zone is the transition zone between aquatic and upland habitat. These habitats are related to and influenced by surface or subsurface waters, especially the margins of streams, lakes, ponds, wetlands, seeps, and ditches between land and a stream; and above the average high watermark, or bankfull height. Plant communities along the river margins are called riparian vegetation, characterized by hydrophilic plants. This habitat zone excludes wetland habitat. |
Required |
number |
0.01 |
| 1518 |
# of acres of riparian wetland habitat treated |
Identify the total acres of habitat treated in this habitat zone. Riparian Wetland: Wetlands within the Riparian habitat zone are habitat that is transitional between terrestrial and aquatic where the water table is usually at or near the land surface or land that is covered by shallow water. Wetlands have one or more of the following characteristics: at least periodically, the land supports predominantly hydrophytic plants; the substrate is predominantly undrained hydric soil; and the substrate is non-soil and is saturated with water or covered by shallow water at sometime during the yearly growing season. These wetlands are typically considered connected wetlands that interact with the hyporheic zone, which is a region beneath and lateral to a stream bed. |
Required |
number |
0.01 |
| 1519 |
# of acres of freshwater non-wetland habitat treated |
Identify the total acres of habitat treated in this habitat zone. Freshwater Non-Tidal: Habitat with freshwater flowing in a channel or watercourse, including lakes, ponds, and adjacent areas below the high water mark. This habitat zone excludes wetland habitat. |
Required |
number |
0.01 |
| 1520 |
# of acres of freshwater wetland habitat treated |
Identify the total acres of habitat treated in this habitat zone. Freshwater Wetland Non-Tidal: Wetlands within the instream habitat zone typically on the stream bank are habitat that is transitional between terrestrial and aquatic where the water table is usually at or near the land surface or land that is covered by shallow water. Wetlands have one or more of the following characteristics: at least periodically, the land supports predominantly hydrophytic plants; the substrate is predominantly undrained hydric soil; and the substrate is non-soil and is saturated with water or covered by shallow water at sometime during the yearly growing season |
Required |
number |
0.01 |
| 1521 |
# of acres of estuarine wetland habitat treated |
Identify the total acres of habitat treated in this habitat zone. Estuarine Tidal Wetland: Wetlands within the tidal estuarine zone are habitat that is transitional between terrestrial and aquatic where the water table is usually at or near the land surface or land that is covered by shallow water. Wetlands have one or more of the following characteristics: at least periodically, the land supports predominantly hydrophytic plants; the substrate is predominantly undrained hydric soil; and the substrate is non-soil and is saturated with water or covered by shallow water at sometime during the yearly growing season. Tidal marshes may be classified as marine source tidal, freshwater tidal, or tidal forested wetlands. |
Required |
number |
0.01 |
| 1522 |
# of acres of estuarine non-wetland habitat treated |
Identify the total acres of habitat treated in this habitat zone. Estuarine Tidal Non-Wetland: Habitat that is part of a semi-enclosed coastal body of water that is subject to the ebb and flow of tides, with one or more rivers or streams flowing into it, and with a free connection to the nearshore marine zone. Estuaries are environments whose pH, salinity, and water levels are subject to the ebb and flow of tides, and the physical and chemical properties of the river that feeds the estuary and the ocean from which it derives its salinity. This habitat zone excludes wetland habitat. |
Required |
number |
0.01 |
| 1563 |
# of barriers in the freshwater zone |
The count of barriers addressed is the total number of fish passage barriers removed at a specified worksite. This is not the number of individual fish passage structure types but the structural blockages as a whole that may be quantified by one Latitude and Longitude and is used to calculate the distance upstream to the next barrier. A barrier in PISCES will be defined as passage barriers created from increased sediment from mine tailings that result in a passage impairment from subsurface flows. |
Required |
number |
1.0 |
| 1564 |
# of barriers in the estuarine zone |
The count of barriers addressed is the total number of fish passage barriers removed at a specified worksite. This is not the number of individual fish passage structure types but the structural blockages as a whole that may be quantified by one Latitude and Longitude and is used to calculate the distance upstream to the next barrier. A barrier in PISCES will be defined as passage barriers created from increased sediment from mine tailings that result in a passage impairment from subsurface flows. |
Required |
number |
1.0 |
| 1565 |
# of miles of dike removed or modified in the freshwater area |
The length of dike treated, or removed in miles. Report the full length of dike removed to match natural conditions. If the dike was breached report the cumulative length of openings created. |
Required |
number |
0.01 |
| 1566 |
# of miles of dike removed or modified in the estuary area |
The length of dike treated, or removed in miles. Report the full length of dike removed to match natural conditions. If the dike was breached report the cumulative length of openings created. |
Required |
number |
0.01 |
| 1567 |
# of miles of dike removed or modified in the riparian area |
The length of dike treated, or removed in miles. Report the full length of dike removed to match natural conditions. If the dike was breached report the cumulative length of openings created. |
Required |
number |
0.01 |
Location Guidance
Identify point where installation, removal or enhancement took place.
Environmental Compliance
Applicability and status of the following environmental compliance requirements can be found on the Environmental Compliance tab for that work element in your SOW for all 2007 contracts forward. BPA's Environmental staff will update and maintain this information in Pisces in real time, so that you can check the status of environmental compliance on your project at any time. Note: Many of the fields are set to auto-load in Pisces, but the settings will be reviewed by BPA's Environmental staff prior to the contract being finalized, and may be revised depending on the specific circumstances. National Environmental Policy Act (NEPA)
NEPA coverage for this work element will be identified by BPA's Environmental Compliance Lead. Endangered Species Act (ESA)
ESA consultation is typically required for this work element. National Historic Preservation Act (NHPA)
NHPA Section 106 consultation is typically required for this work element which often includes a cultural/historic resource survey by a qualified archaeologist. Public Involvement
Public involvement is typically required for this work element. The contractor should work with BPA Environmental staff to document previous or ongoing outreach efforts associated with this work or to develop a public involvement plan.
Associated Work Elements
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