Storm Water Design Documentation

Purpose:

Instructions:

Grey Cells Are User Input Values And Info

Green Cells Are Automatic Calculations Done By Spreadsheet Yellow Cells Are Design Outcome And Critical Items Done By Spreadsheet

The Project Title naming convention should follow:

NOTE: The spreadsheet version number is shown as a footnote on the printout of each sheet. See the HRM revisions website

at http://www.wsdot.wa.gov/Environment/WaterQuality/Runoff/HighwayRunoffManual.htm for the current version number being

used.

Blank Templates On Tabs To The Right---------->

Hwy(SR xxx, I xxx, US xxx) / Project physical location & Phase - Type of work MP to MP

This spreadsheet is a companion to the 2008 Highway Runoff Manual (HRM ) and is used to determine a given

Project's Minimum Requirements as well as specific requirements for each TDA (where applicable). It aids in the

preparation of Hydraulic Reports and is linked to information needs of the Stormwater Design NEPA/SEPA

Documentation Checklist used for a Project's environmental documentation.

Color Key

The tabs "Step 1 Through Step 4", "Step 5 and 6", "Step 7 RT", and "Step 8 FC" refer to the HRM Figures 3.1 - 3.3.

The tabs "Retrofit Step 1", "Retrofit Step 3", "Retrofit Step 4", and "Retrofit Step 6" refer to the HRM Chapter 3-4.

If needed, the password to unlock each worksheet is "WSDOT1" using all capital letters.

Input information into grey unlocked cells. After entering all required information, see yellow cells for critical outcomes.

The HRM has been deemed equivalent to Ecology's Stormwater Management Manuals for Eastern and Western WA .

However, numeric references to chapters and minimum requirements in this spreadsheet are specific to the HRM

and differ in naming from Ecology's manuals. Please contact the WSDOT HQ Hydraulics Office if you have any

questions or comments about this spreadsheet.

227828651.xls.ms_office (Instructions) 5/12/2014 3:31 AM Version 3.0

Project Title:

WSDOT Region: Northwest

WIN: 123456789

PIN(s):

Design Manual Used:

Manual Publication Year: 2008

Job Number: XL 1234

Is this project in western Washington? YES

Existing Impervious Surface

Total Project Area (ft2) 0

New Impervious Surface


Conversion of Native Vegetation to Lawn or Landscaped

Total Project Area (ft2) ENTER NUMBER VALUE

Conversion of Native Vegetation to Pasture


Replaced Impervious Surface


Land Disturbing Activity


Is this project a "non-road-related" project? (See HRM Glossary for definition) NO

Description Project Area Threshold Area TriggersHRM Figure 3.1

Step #

Decision

Response

New and replace impervious surfaces added to

Project0 ≥ 2,000 ft

2 2 NO

Land disturbing activity for the Project 0 ≥ 7,000 ft2 2 NO

New impervious surface added to Project 0 ≥ 5,000 ft2 3 NO

Conversion of native vegetation to lawn or

landscaped area0 ≥ 32,670 ft

2 (3/4 acres) 3 NO

Conversion of native vegetation to pasture 0 ≥ 108,900 ft2 (2.5 acres) 3 NO

New impervious surfaces add 50% or more to

the existing impervious surfaces within the

Project limit

#DIV/0!

New impervious ≥ 5,000 sq. ft AND (New

Impervious surface) ≥ 1/2 (Exist

Impervious surface)

4 NO

For non-road-related Projects, proposed value

of improvements greater than replacement

value

See HRM Figure 3.1 for complete threshold.

Non-road-related project generally refers to

rest area, ferry terminals, and maintenance

facility Projects.

(New impervious + replaced impervious)

≥ 5,000 sq. ft AND (Proposed value of

improvements) ≥ 1/2 (replacement value

of existing site)

4 N/A

Apply MR 2 to the Project

Do not apply Minimum Requirements 6-9 to the new impervious surfaces on Project

Do not apply Minimum Requirements 6-9 to the replaced impervious surfaces on Project

Analysis is Done. Continue to Retrofit Step 1 tab, if applicable

MR # Minimum Requirements MR #

1 Stormwater Planning 6

2 Construction Stormwater Pollution 7

3 Source Control of Pollutants 8

4 Maintaining the Natural Drainage 9

SR 005 / Pierce County Line to Tukwila Stage 25 - Widening MP 209 to MP 225

Highway Runoff Manual

HRM Minimum Requirements

Check threshold for land disturbing activity below

Incorporating Watershed-Based/Basin

Operations and Maintenance

Summary of All Minimum Requirements:

abcdefghijk

Wetland Protection


Minimum Requirements

Flow Control (Quantity)






227828651.xls.ms_office (Step1 through Step 4) 5/12/2014 3:31 AM Version 3.0 Updated 11/13/08

5 Runoff Treatment (quality)

227828651.xls.ms_office (Step1 through Step 4) 5/12/2014 3:31 AM Version 3.0 Updated 11/13/08

Project Title:


WIN: 123456789

PIN(s):

Design Manual Used:


Job Number: XL 1234

Is this project in western Washington? YES

Existing PGIS


New PGIS


Conversion of Native Vegetation to PGPS


Replaced PGIS


Is this project a "non-road-related" project? (See HRM Glossary for definition) NO

Description Project Area (ft2) Threshold Area (ft

2)

HRM Figure 3.2

Step #Decision Response HRM Minimum Requirements

New PGIS added to Project 0 ≥ 5,000 5 NOCheck threshold for conversion of Native

Vegetation to PGPS

Conversion of Native Vegetation to PGPS 0 ≥ 32,670 (3/4 acres) 5 NO

DO NOT apply MR 5 for the new PGIS and

converted PGPS on the Project

New PGIS add 50% or more to the existing

PGIS within the Project limit#DIV/0!

New PGIS ≥ 5,000 AND

(New PGIS) ≥ 1/2 (Exist PGIS)6 NO

DO NOT apply MR 5 to the replaced PGIS on

the Project

For non-road-related Projects, proposed value

of improvements greater than replacement

value

See HRM Figure 3.1 for complete

threshold. Non-road-related Project

generally refers to rest area, ferry

terminals, and maintenance facility

projects.

(New PGIS + replaced PGIS) ≥

5,000 AND (Proposed value of

improvements) ≥ 1/2

(replacement value of existing

site)

6 N/A Check road-related project threshold above

Go to Step 8 FC tab

MR # Minimum Requirements MR #

1 Stormwater Planning 6

2 Construction Stormwater Pollution 7

3 Source Control of Pollutants 8

4 Maintaining the Natural Drainage 9

5 Runoff Treatment (quality)

Operations and Maintenance

Minimum Requirements

Flow Control (Quantity)

Wetland Protection

Incorporating Watershed-Based /Basin

abcdefghijk



Summary of All Minimum Requirements:Do not apply MR 5 to New PGIS and converted PGPS on the Project

Do not apply MR 5 to Replaced PGIS on Project

227828651.xls.ms_office (Step 5 and 6) 5/12/2014 3:31 AM Version 3.0 10/31/08

Project Title:


WIN: 123456789

PIN(s):

Design Manual Used:

Manual Publication

Year:2008

Job Number: XL 1234

NO Is this project in western Washington? YES

TDA DescriptionNew PGIS

Area (ft2)

Replaced

PGIS

Area (ft2)

Non-

Effective

PGIS

Area (ft2)

Effective

PGIS

Area (ft2)

Converted

PGPS

Area (ft2)

RT needed for TDA

based on Effective

PGIS?

Flow Chart Step 7

(Yes/No)

RT needed for TDA

based on PGPS?

Flow Chart Step 7

(Yes/No)

RT needed

for TDA?

PGIS Area

(ft2)

RT needed

for TDA?

Converted

PGPS Area

(ft2)

If RT needed,

what is ADT of

roadway in

TDA? (ADT)

Is Roadway

inside Urban

Growth Area?

(Yes/No)

Enhanced RT or

Basic RT?

(Enhanced/Basic)

Oil Control

(Yes/No)

Phosphorus

Control?

(Yes/No)

Comments

0 0 0 0 0 0 0

Description


abcdefghijk


Is replaced PGIS applicable to the project per step 6?

Refer to HRM Figure 3.3 Step 7

Area Totals for Project

227828651.xls.ms_office (Step 7 RT) 5/12/2014 3:31 AM VERSION 3.0 11/13/08

Project Title:


WIN: 123456789

PIN(s):

Design Manual Used:


Job Number: XL 1234

Refer to HRM Figure 3.3 Step 8

Is replaced Impervious surface applicable to the project per flow control step 5? NO Is this project in western Washington? YES

TDA Description

New

Impervious

Surface

Area (ft2)

Reverted

Impervious

Surface**

Area (ft2)

Net-New

Impervious

Surface

Area (ft2)

Replaced

Impervious

Surface

Area (ft2)

Non-Effective

Impervious

Surface

Area (ft2)

Effective

Impervious

Surface

Area (ft2)

Conversion of Native

Vegetation to Lawn or

Landscape per TDA

Area (ft2)

Increase of 0.1 cfs in

100-year Recurrence

Interval Flow for

TDA?***

(Yes/No)

FC Needed for TDA

based on Effective

Impervious surface

threshold?

(Yes/No)

FC needed for TDA

based on Native

Vegetation Conversion?

(Yes/No)

FC needed for TDA

based on 0.1 cfs

increase in flow?

(Yes/No)

FC needed for

TDA?

Effective

Impervious

Area (ft2)

FC needed for

TDA?

Converted Pervious

Surfaces Area (ft2)

Comments

0 0 0 0 0 0 0 0 0

** Input zero into this column if the reverted impervious surface does not meet the requirements per HRM 4-3.6.1 (Western WA) and 4-4.6.2 (Eastern WA).

***See Highway Runoff Manual 3-3.6.3 for MGSFlood modeling guidance.


abcdefghijk


Description


227828651.xls.ms_office (Step 8 FC) 5/12/2014 3:31 AM VERSION 3.0 11/13/08

Project Title:

WSDOT Region:

WIN:

PIN(s):

Design Manual Used:

Manual Publication Year:

Job Number:

Per Section 3-4.1, does the project have any existing impervious surfaces that will:

2) Are there any high priority stand-alone stormwater retrofits projects within the project limits?

TDA Description Begin MP End MPDiameter

(inches)

Pipe or Channel

Material

Channel

Width

(inches)

Stormwater BMP Type(s)

Approximate

Stormwater BMP

Size

Area (ft2)

Retrofit Existing

Impervious (REI), Stand-

Alone Stormwater

Retrofit (SASR), OR

N/A?

If REI, List Existing

PGIS mitigated by

TDA for Runoff

Treatment

Area (acre)

0

** For "Other" structure type and Material, provide written description of what that outfall structure is and submit it with outfall inventory spreadsheet ("Outfall Inventory" tab). See Instructions Tab for Outfall Inventory submittal Instructions.



Northwest

123456789

abcdefghijk


1) Be retrofitted, or

2008

XL 1234

Outfall Structure Type If a SASR, Describe work to be done.

227828651.xls.ms_office (Retrofit Step 1) 5/12/2014 3:31 AM

If REI, List Existing

Impervious Surfaces

mitigated by TDA for

Flow Control

Area (acre)

0


Project Title:

WSDOT Region:

WIN:

PIN(s):

Design Manual Used:


Job Number:

Is the project able to provide all the required flow control for the applicable replaced impervious surfaces?

TDA Description Begin MP End MP Outfall Structure Type**Diameter

(inches)

Pipe or Channel

Material

Channel

Width

(inches)


Approximate

Stormwater

BMP Size

Area (ft2)

Required amount of applicable

replaced impervious surface

needing flow control per TDA

Area (acre)

Amount of applicable


receiving flow control per

TDA

Area (acre)



not receiving flow control

per TDA

Area (acre)

0.00 0.00 0.00

** For "Other" structure type, provide written description of what that outfall structure is and submit it with outfall inventory spreadsheet. See Instructions Tab for Outfall Inventory submittal Instructions.


2008



Northwest

123456789

abcdefghijk

XL 1234


Project Title:

WSDOT Region:

WIN:

PIN(s):

Design Manual Used:


Job Number:

Is the project able to provide all the required runoff treatment for applicable replaced PGIS?


(inches)

Pipe or Channel

Material

Channel Width

(inches)Stormwater BMP Type(s)

Approximate

Stormwater BMP

Size

Area (ft2)

Required amount of

applicable replaced PGIS

needing runoff treatment

per TDA

Area (acre)


replaced PGIS receiving

runoff treatment per TDA

Area (acre)

0.00 0.00



Northwest

123456789


abcdefghijk


2008

XL 1234



replaced PGIS not receiving

runoff treatment per TDA

Area (acre)

0.00


Project Title:

WSDOT Region:

WIN:

PIN(s):

Design Manual Used:


Job Number

For projects in western Washington, is a historic (typically forested) predeveloped land cover condition assumed for the effective impervious surfaces?


(inches)

Pipe or Channel

Material

Channel

Width

(inches)


Approximate

Stormwater

BMP Size

Area (ft2)

Required amount of flow control

to satisfy the flow duration

standard using a historic

predeveloped land cover

condition

Volume (ft3)

Required amount of flow control

to satisfy the flow duration

standard using an existing

predeveloped land cover condition

Volume (ft3)

0 0




2008


Northwest

123456789

abcdefghijk

XL 1234

227828651.xls.ms_office (Retrofit Step 6 (W WA ONLY)) 5/12/2014 3:31 AM

Volumetric differnce between using

a historic predeveloped land cover

condition and an exisitng land

cover condition per TDA

Volume (ft3)

0

227828651.xls.ms_office (Retrofit Step 6 (W WA ONLY)) 5/12/2014 3:31 AM

Documents

Storm Water Design Documentation