Pre-post development Study
Pre-post development Study
(OP)
If I do a tabular hydrograph study on a site for pre vs. post development, do I have to take off-site into account, or can I just consider the changes on the onsite only.
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Contact USThanks. We have received your request and will respond promptly. Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting Guidelines |
Pre-post development Study
|
Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.
Here's Why Members Love Eng-Tips Forums:
Register now while it's still free!
Already a member? Close this window and log in.
RE: Pre-post development Study
either
a) you manage those flows somehow
b) adjacent property owner manages those flows
c) or you get flooded
what happens in the interim when your site gets built, the adjacent offsite area does not get developed, flood hits and then your subject site gets flooded? Eventually the offsite may be developed, but until then, subject site is at risk.
RE: Pre-post development Study
KRS Services
www.krs-services.com
RE: Pre-post development Study
You have to design your system to handle the offsite flows but you do not need to reduce those flows.
In NJ (USA), the RSIS (residential site improvement standards) call for flows to be reduced to 50% of pre-dev. flows for 2 year storm, 75% for 10 year, and 80% for 100 year.
If you are developing a site with off site drainage contributing, calculate the off-site flow separately and add that number to your allowable flow, i.e., 50% of the 2 year storm (for the area you are developing). Then design your detention system.
Hope that helps, whether I was on target or not with the question!
RE: Pre-post development Study