Edit post

Edit your reply below.

Post Body
Enter your post below.
[quote user="CMStPnP"]Just to let you know. Most storage tunnel projects are not a solution and are tremendously expensive. The theory of building them is they catch the overflow sewage during periods of heavy surge and then the sewage treatment plants can process at their liesure 24 by 7 making them more efficient.[/quote] The overflow problem occurs with combined sewer systems. You could design a tunnel system that totally avoids overflows, until you get a new record rain. Consideration between goals and costs. There is no 100% safety. The Portland, OR CSO tunnels reduces overflows into the Willamette River by 94%, and the Columbia Slough by 99%. According to publications a different approach, in this case seperation of rain water and sewage was estimated at twice the cost. Building more wastewater treatment plants isn't necessarily a suitable solution. They need a minimum water flow and can process a maximum water flow. If you shut it down it takes some time until it work efficiently, too late for a rain storm. And they cost too. Oak Harbor WA builds a pure sewage treatment plant (seperate sewage and rain water systems) at about $142 million for estemated 40,000 people including new pump stations and relaid sewage pipes. [quote user="CMStPnP"]t's a lot better to just spend the damn money and fix the sewer lines as well as expand sewage treatment capacity than it is to build what amounts to a large holding tank. Just saying, don't be fooled by the politicians. They did not fix the problem they only put a band aid on it.[/quote] As said there is no 100% safety, even with new wastewater treatment plant. The next new record rain and they might be too small again. Someone has to pay for both and the storage tunnels have lower maintenance and operating cost. There is not one solution fits all. Regards, Volker
Tags (Optional)
Tags are keywords that get attached to your post. They are used to categorize your submission and make it easier to search for. To add tags to your post type a tag into the box below and click the "Add Tag" button.
Add Tag