Interesting question.

My response is valid for the lower Fraser Valley region around Vancouver,
Canada. I think it is also fairly typical for the Seattle area.

For average residential developments approximately 90% of the roadway has
storm drainage piping beneath.

Our typical minimum storm drain pipe size is 250mm (10").

I am concerned that your study may not be comparing apples to apples.
We tend to take a different design approach to LID, and of course it is
quite site specific.

Good Luck with your study,

Doug Sinclair PEng
LEED Accredited Professional
Pomeroy Consulting Engineers Ltd.
Tel. 604 297 2134 Fax. 604 294 0400
doug@...

----- Original Message -----
From: "Norman MacLeod" <gaelwolf@...>
To: <stormwaterpro@yahoogroups.com>
Sent: Friday, February 24, 2006 7:48 AM
Subject: [StormwaterPro] installation of stormwater drain pipes in
subdivision roadways


> Greetings, members of the Stormwater Pro discussion group. We are
> conducting a study for US Department of Housing and Urban
> Development examining cost barriers to affordable housing due to
> infrastructure and other land development requirements found in
> subdivision regulations and zoning ordinances. One factor is the
> installation of conventional stormwater management infrastructure as
> compared with a low impact development approach.
>
>
>
> An element of the standard stormwater infrastructure cost we are
> attempting to quantify is the cost of the storm drain pipe
> installation in the roadways. We are asking for stormwater design
> professionals to suggest typical values or ranges of values for the
> percentages of the roadway lengths that have storm drainage piping
> running in utility trenches. We know the typical or average percent
> will be something less than 100% of the roadway length but don't
> have any information source
> for narrowing down the range. Our default value is likely to be
> 50% in
> the absence of any available data we can access. Thank you .
>
>
>
>
>
> Alexander P. Duran, Ph. D., P. E.
>
> Senior Environmental Engineer
>
> National Association of Home Builders
>
> Research Center
>
> 400 Prince Georges Boulevard
>
> Upper Marlboro MD., 20774
>
> 301-430-6221 fax: 301-430-6183
>
> aduran@...
>
>
>
> www.nahbrc.org <http://www.nahbrc.org>
>
>
>
>
>
>
>
>
> Don't forget to use the StormwaterPro resources
> available at:
>
> http://www.egroups.com/group/stormwaterpro
>
> he StormwaterPro resources
> available at:
>
> http://www.egroups.com/group/stormwaterpro
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>