OPERATION & MAINTENANCE MANUAL

Water Quality Biofiltration Swale

Manual prepared: Month/Year

DFI No.	DXXXXX

Figure 1: DFI No. DXXXXX, looking [note cardinal direction]

Identification

Drainage Facility ID (DFI):	DXXXXX
Facility Type:	Water Quality Biofiltration Swale
Construction Drawings:	(V-File Numbers) xxV-xxx
Location:	District: xx Highway No.: xx Mile Post: xx to xx, [side]

Manual Purpose

The purpose of this manual is to outline inspection needs and summarize maintenance actions.

Facility Location

The location map below details the facility location. The highway, mile posts, side streets, access location, and stormwater flow directions are noted on the map.

Facility location type: Roadway shoulder

Flow direction: West

Figure 2: Facility location map

Facility Summary

The length and width of a swale is based on the bottom dimensions.

The bottom length and bottom width of the swale is:

Bottom Length (feet)	Bottom Width (feet)
xx	x

The depth of the swale is the vertical distance measured from the bottom of the swale to the top. The slope of the swale sides is presented by a vertical distance (rise) followed by the horizontal distance (run).

Depth and side slopes:

Depth (feet)	Rise (feet)	Run (feet)
x	xx	xx

Site Specific Information:

Enter any site specific information or measurements that should be noted for this facility and are not included in the sections above.

Facility Access

Maintenance access to the facility:

☐Roadside pad	☐Roadside shoulder
☐Access road with Gate	☐Access road without Gate

Figure 3: [insert post construction facility access photo and caption text]

Operational Components / Maintenance Items

Classification

This facility is classified as an:

☐ On-line Swale	☐ Off-line Swale
A swale that does not include a high flow bypass component; flow drains into and through the facility	A swale that treats low/small flows and diverts high flows using a bypass component

Bypass Component

This facility includes a high flow bypass component:

☐ No	☐ Yes
There is no bypass component. High flows drains into and through the facility	There is a bypass component. Only low/small flows drain into the swale. High flows are diverted around the swale using a bypass component

Operational Components

A swale has many components that assist with treatment, conveyance, and reducing flow velocity to minimize erosion. The components in use can vary depending if the facility was designed to operate on-line or off-line. The facility components table (Table 1) highlights the applicable components for this facility. The component is in use when the box contains an “x” (e.g. ☒ ).

The Standard Operation Manual for Water Quality Biofiltration Swales (implemented March 2017) outlines facility operation, typical footprint configuration, and component definitions and details. A link to the manual is attached to the feature marker in TransGIS.

https://gis.odot.state.or.us/TransGIS/

Operational Plan

The applicable standard operational plan for this facility is:

☐ Operational Plan A	☐ Operational Plan B	☐ Operational Plan C
An on-line swale with roadside ditches	An on-line swale with piped inlets and outlets	An off-line swale with a piped high flow bypass
A standard operational plan illustrates the general facility footprint configuration and explains the purpose of each facility component. Operational plans (A, B, C) are provided in the Standard Operation Manual.

See Appendix A for the site specific operational plan.

Maintenance Items

Operational components marked in Table 1 should be inspected and maintained according to Section 7. Each facility component is defined and detailed in the Standard Operation Manual using the associated ID number indicated below.

Table 1: Swale Components	ID #
Manholes/Structures
Pre-treatment manhole	☐
Weir type flow splitter/flow splitter manhole	☐
Orifice type flow splitter/flow splitter manhole	☐
Standard manhole	☐
Swale Inlet
Pavement sheet flow	☐
Inlet Pipe (s)	☐
Open channel inlet	☐
Riprap pad	☐
Ground Cover
Grass bottom	☐
Grass side slopes	☐
Granular drain rock	☐
Plantings	☐
Underground Components
Geotextile fabric	☐
Water quality mix	☐
Perforated pipe	☐
Porous pavers (access grid)	☐
Flow Spreader
Rock basin (used at inlet)	☐
Anchored board (midpoint of swale or every 50 feet along swale bottom)	☐
Other: describe type	☐
Swale Outlet
Catch basin with grate	☐
Outlet Pipe (s)	☐
Open channel outlet	☐
Auxiliary Outlet: describe type	☐
Outfall Type
Waterbody (Creek/Lake/Ocean)	☐ C ☐ L ☐O
Ditch	☐
Storm drain system	☐
Outfall Components
Riprap pad	☐
Riprap bank protection	☐

Maintenance

Maintenance Frequency/Maintain Records

Inspect annually, preferably prior to the rainy season.

Clean and maintain as necessary. Refer to Activity 125 for conditions when maintenance is needed.

Keep a record of inspections, maintenance, and repairs.

Maintenance Guide/Maintenance Actions

The ODOT Maintenance Guide lists the standard maintenance actions for water quality facilities under Activity 125.

Standard maintenance tables describe the maintenance component, the potential defect or problem, the condition when maintenance is needed, and the recommended maintenance to correct the problem. Use the following tables to maintain ODOT swales:

Table 1 (General Maintenance): Contains general maintenance and inspection guidelines that are applicable to all ODOT water quality facilities

Table 3 (Maintenance of Water Quality or Biofiltration Swales): Contains maintenance information for swales

The Maintenance Guide can be viewed here:

http://transnet.odot.state.or.us/hwy/MaintOPs/Pages/Maintenance%20Guide.aspx

Limitations

Access grid installed:

☐ No	☐ Yes
There are (no, light, med., heavy) porous pavers installed in this swale

Swales are designed to allow equipment access along the bottom. If an access grid is NOT installed, vehicles entering the swale can create depressions (tire ruts), damage vegetation, and damage structural components (e.g. flow spreaders). These conditions may result in poor treatment and drainage performance.

Equipment wheels should be kept on the tops and side slopes. Mower arms may be run along the swale bottom.

Waste Disposal

Material removed from the facility is defined as waste by the Department of Environmental Quality (DEQ). Refer to the roadwaste section of the ODOT Maintenance Yard Environmental Management System (EMS) Policy and Procedures Manual for disposal options:

http://www.oregon.gov/ODOT/Maintenance/Documents/ems_manual.pdf

Contact any of the following for more detailed information about management of waste materials found on site:

ODOT Materials Management Coordinator	(503) 731-8493

ODOT Statewide Hazmat Coordinator	(503) 667-7442

ODOT Region 1 Hazmat Coordinator	(503) 731-8290

ODOT Region 2 Hazmat Coordinator	(503) 986-2647

ODOT Region 3 Hazmat Coordinator	(541) 957-3594

ODOT Region 4 Hazmat Coordinator	(541) 388-6186

ODOT Region 5 Hazmat Coordinator	(541) 963-1590

ODEQ Northwest Region Office	(503) 229-5263

Appendix A – Site Specific Operational Plan

Contents:

Operational Plan: DFI DXXXXX

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Appendix B – Project Contract Plans

Contents:

Site Specific Subset of Project Contract Plan xxV-xxx

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