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Drainage Design

Drainage Design

Drainage Design

(OP)
I am currently working on an urban roadway widening project, which is about 3 miles long.  I encountered a problem when designing drainage.  The site is flat and constructing series of underground culverts is not feasible. Therefore, I came up with two alternatives:
•    Raise the existing pavement and construct an earthen ditch along one side of the roadway
•    Construct earth berm

However, these two designs will require additional ROW.  Can anyone suggest a drainage system with less impact? Thanks for the help.

RE: Drainage Design

bico1010,

This is a widening of an EXISTING road ?  How is this roadway and right of way drained now ?  If there are existing culverts, why can't they be extended ? If there are no culverts, only ditches along the alignment, why can't they be relocated along, and parallel to, the widened section ?

Good luck

RE: Drainage Design

constructing a berm may not be a feasible approach, since this could cause ponding on adjacent property.

RE: Drainage Design

How much drainage is there across the road now, cfs and culverts?

RE: Drainage Design

(OP)
There are no existing culverts, and the flow is about 1000cfs.

RE: Drainage Design

Unbelievable ! 1000 cfs drains along or across this road, or both.  Where does it go now ?  Does it just disappear into the earth ? Does it flow over the road uncontrolled ? Doesn't this create a problem for traffic?  If ther is no traffic why on earth does it need widening ?

Enlighten us, PLEASE.

RE: Drainage Design

hopefully the 1,000 cfs is not in one location but in several along the 3 miles.  Is this 100-year flow?

RE: Drainage Design

This 1,000 cfs is projected 1% or so flow I presume.  The grade of the three miles is flat? What will be damaged by ponding?  What is the traffic count?  Lots of potential solutions, depending on the particulars.

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