The Ontario Ministry of Transportation established a system that on first glance seems to be what you are looking for.
Their system is based on some calculated/assumed values for how much fuel is used for various contract activities and a fuel price index based on the average daily cost of fuel...
I may be able to shed some light on it...
Down here in the Windsor area, it appears that the problem stems not from the pipe itself but rather a couple contractor's who installed it. Basically, it was installed in a similar manner to concrete pipe which requires only minimal compaction of the...
Line = Horizontal Alignment
Grade = Vertical Alignment
Of course, there should also associated items indicating the allowable construction tolerances (ie how much the Contractor can be out without it being "wrong") and how much the Engineer can alter the line and grade in the field without the...
In my area the depth of allowable road ponding on public roads ranges from none for sewer design storm event to a maximum of 300mm (1') for 1:100 Year event. (The sewer design storm is the 1:2 or 1:5 year event depending on the Municipality.) Of course, in practical terms you can only generally...
Unfortunately, an orifice plate on the connector pipe won't work in this situation.
The minimum orifice I can use is 100mm (4") due to local standards and clogging issues. If the orifice was placed on the connector pipe it won't restrict the flows enough to create road storage.
David Dietrich...
Its a lovely thing called "stormwater management". In my area it boils down to "Post-development peak runoff cannot exceed Pre-development peak runoff". When you restrict the rate at which water leaves the site you need to create storage to contain the water that you are detaining for later...
Hello,
I am looking for detail drawings for a catch basin "hanging trap" aka "horizontal orifice plate". To be clear, this is an insert which sits just below the catch basin frame & grate and restricts the flow into the catch basin and thereby forces water to pond on the road. It should be...
It all depends on the situation as to whether flows less than 30% of pipe capacity are "acedemic". In my area everything is flat enough that pipes are often minimum allowable diameter and grade and flows are in the 0-30% range often enough to be an issue. The whole reason for the "actual...
There is a similar thread for calculating partially full pipe depths, areas, wetted perimeters, etc. where I have explained how to set up a spreadsheet to handle the calculations.
Please see "Open Channel, Partially full pipe flow in excel. Please help!" in this forum...
Sorry its taken so long to respond but I've been in the field/on holiday.
Unfortunately I don't have access to the spreadsheets at the moment but here is the basic method:
1) Set up a table for %full depth based on a pipe diameter of 1. Depth increments of 0.01 are what I traditionaly use.
2)...
Kate,
I just so happen to already have such a spreadsheet in Excel.
I set up a table that calculated the flow and velocity in a generic pipe at incremental depths. I then used the lookup function to find the entry in the table with the closest "% Full Flow Capacity" and read off the...
After rereading the problem statement and the the comments from others it seems to me that rather than looking for an adjustable standpipe you are looking for an adjustable orifice of some kind so that as the expected water level under storm conditions increases you end up with the same outlet...
Have you considered leaving the standpipe alone and installing a valve or gate instead? Then you could adjust the valve or gate as required.
I've seen something similar here with a weir gate that would be raised and lowered throughout the year in order to control the water level in the pond...
The best person to ask about how much space will be needed to do the work is someone who does the work. Call up one of the local contractors you have a good relationship with and ask them how much they'll need.
Stage-storage in sloped pipes is not the easiest calculation to do. Luckily for me I use MIDUSS for my stormwater designs and analysis and it includes pipe storage as an option and calculates it for me. (As well as parking lot storage and normal storage in ponds.)
That said, while MIDUSS does...
