ST9905-CS050803I Suzan Taylor - FW: FW: Bethel Road Box Culverts Page 1 j
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<ccbond@transystems.com>
<staylor@ci.coppell.tx.us>
8/3/2005 12:44:35 PM
FW: FW: Bethel Road Box Culverts
Suzan,
I meant to forward Mike Hobbs results to you earlier today, but I wanted
to look over his data first. It looks like raising the box culvert
flowiine to 501.33 (proposed top of 18" sleeve) and using 6'x10' boxes
will work, although it's close. The calculated water surface ends up
being 508.82 just below 509.02 (top of road) or 509.52 (top of curb).
Craig
.... Original Message .....
From: FW-Mike Hobbs
Sent: Tuesday, August 02, 2005 6:18 PM
To: DL-Charles Bond
Subject: RE: FW: Bethel Road Box Culverts
Craig,
Attached is the revised model as mentioned below. I did re-grade the
channel to tie in to the new elevations. The water does not go aver the
mad but it is close. Less than .5'. I want to remind you that it will
probably need to be noted somewhere that this box might have to be a
direct drive box. I calculate approx 2' from the inside wall to the top
of pavement. This does not leave much room for the top of the box and
the pavement section. I just thought it needed to be mentioned.
Michael Hobbs, E.I.T,
Transystems Corporation Consultants
Fort Worth, Texas
mrhobbs@transystems.com
P (817) 334-4449
F (817) 336-2247
.... Odginal Message .....
From: DL-Charles Bond
Sent: Tuesday, August 02, 2005 4:22 PM
To: FW-Mike Hobbs
Subject: FW: FW: Bethel Road Box Culverts
Mike,
Can you please m-run the HEC using a flowline elevation of 501.33 at
the Bethel Road box culverts (using 4-6'x10' box culverts). Thanks.
Craig
..... Original Message .....
From: Suzan Taylor [mailto:staylor@ci.coppell.tx.us]
Sent: Tuesday, August 02, 2005 4:06 PM
To: DL-Charles Bond
Subject: Re: FW: Bethel Road Box Culverts
Craig:
Would you please have Mike Hobbs rerun the HEC with the new flowline and
[ Suzan Taylor - FW: FW: Bethel Road Box Culverts Page 2 1
6' x 10' boxes before I approach Ken. I do not want to have to go back
to Ken with another design if this design will not work. I gave Keith a
copy of the design yesterday for him to review.
Thanks
Thanks
>>> <ccbond@transystems.com> 08/02/05 2:30 PM >>>
Suzan,
I heard back from our structural engineer and he said the pipe
penetration detail, with some minor modifications, will work. So, if
the pipe penetration detail concept is acceptable to the City, I can set
the box culvert flowline at the top of the sleeve (501.33) and proceed.
I still need to have Mike Hobbs perform another HEC run using the new
box culvert flowline (501.33) and 4-6'x10' boxes to see where the CWSEL
ends up.
Craig
From: DL-Charles Bond
Sent: Monday, August 01, 2005 2:19 PM
To: staylor@ci.coppell.tx.us
Subject: FW: Bethel Road Box Culverts
Susan,
Attached is the proposed pipe penetration detail I sent to Mike Brown,
our structural engineer, but I haven't received any comments back yet.
Craig
From: DL-Charles Bond
Sent: Monday, August 01,2005 2:03 PM
To: FW-Michael Brown
Cc: FW-Mike Hobbs
Subject: Bethel Road Box Culverts
Mike Brown - Can you please take a look at the attached box culvert
penetration sketch and let me know what you think. There is a 12" sewer
line going under the box culverts at Bethel Road. We can't lower the
sewer line so I'm proposing to encase the 12" PVC sewer line in an 18"
cast iron pipe sleeve and add an 8" lap splice concrete slab (not sure
I Suzan Taylor - FW: FW: Bethel Road Box Culverts Page 31
of my nomenclature) below the pipe sleeve penetration. The cast iron
pipe penetration would go through a set of 4 multiple box culverts (see
attached plan view for reference). I also looked at lowering the box
culvert so the penetration could go through the box culvert walls
instead, but the resulting down stream slope and COE permit requirements
make this a poor option.
Mike Hobbs - Since we can't lower the sewer line, I'm proposing to raise
the box culvert flow line by 0.68 ft from 500.65 (ELMIN from your HEC
run) to 501.33 If the rise in the CWSEL is proportional (as it
appeared to be in earlier HEC runs), the CWSEL for the 4-5'x10' box
culverts would increase from 508.74 to 509.42 F & N's roadway
elevation is 509.02 (top of curb at 509.52), so we may need to bump up
the boxes to 4-6'x10' to reduce the CWSEL The resulting increase in box
size would put the top of the 4-6'x10' box culverts at 508. I spoke with
Sam Meisner at F & N this morning and he is sending me their latest plan
and profile so I can verify their roadway elevations.
Craig Bond, P.E.
TranSystems Corporation Consultants
3010 LBJ Freeway, Suite 990
Dallas, Texas 75234
Ph 972-280-9300 x 225
Fax 972-280-9715
Cell 817-296-8536
ccbond@transystems.com