Westhaven 2B- CS150506Kimley»>Horn
Date: May 6, 2015 Job Number: 064447702
Project Name: Westhaven Phase 2B
To: Mr. George Marshall
City of Coppell
265 Parkway Blvd.
Coppell, TX 75019
972.304.3679
We are sending these by
❑ U.S. Mail
❑ Other:
Transmittal
❑ FedEx ® Hand Deliver
We are sending you
® Attached ❑ Under separate cover via
❑ Shop Drawings ® Prints/Plans ❑ Samples ❑ Specifications
❑ Other:
Copies Date No.
Description
the following items:
❑ Change Orders
1 set
05/07/15
01
City Mark -Ups
2 sets
05/07/15
02
Revised Plans
1
05/07/15
03
Street Capacity Exhibit
1
05/07/15
04
Comment Response Letter
These are transmitted as checked below:
❑ For your use ❑ Approved as submitted ® Resubmit ❑ Copies for approval
® As requested ❑ Approved as noted ❑ Submit ❑ Copies for distribution
❑ For review and comment ❑ Returned for corrections ❑ Return ❑ Corrected prints
Remarks:
Thank You,
Copy to:
Signed Mike Molge
Kimley»>Horn
May 7, 2015
Mr. George Marshall
City of Coppell
265 Parkway Blvd.
Coppell, TX 75019
RE: Westhaven Phase 2B
Dear Mr. Marshall:
This letter is in response to your comments received on April 27, 2015. The following items have
been addressed as per the referenced review:
Drainage and Storm Plan -
1. Adjust inlet locations & be sure to not exceed street capacity. Revise drainage calculations
as necessary.
Response: An exhibit has been provided demonstrating how street capacity has not
been exceed. Inlets in the drainage areas that were marked up are at low points and
therefore have street capacity in each direction. The 8.8 CFS street capacity has not
been exceeded in either direction.
Plan Sheet Hand Markup Comments -
1. Sheet C-04, Label Windsor Road.
Response: Windsor Road has been labeled as requested.
2. Sheet C-05, Remove vertical curve from Wingate Road Profile.
Response: Vertical curve has been removed from Wingate Road as requested.
3. Sheet C-08, Label street names on drainage area map.
Response: Street names have been labeled as requested.
4. Sheet C-09, Use 7.56 as the intensity for all lines and pipe segments.
Response: The increase in time of concentration is a function of the time the flow is in
the pipe calculated using the velocity of the flow. We have conservatively only
adjusted the intensity at whole number time of concentrations. Hydraulics are
extremely tight on these lines and changing that intensity will cause unnecessary
increases in pipe sizes. Westhaven Ph. 1 and 2A adjusted the time of concentration in
the same manner we have used in this phase.
i 5750 Genesis Court, Suite 00 Frisco, TX 75034
K:\FRI_Civil\64447702Wdmin\Correspondence\Letters-Memos\Phase 2\20150506_Response Letter- Westhaven Phase 2B - 2nd Round of Comments.doc
Kimley)>)Horn Page
5. Sheet C-09, Negative head loss circled as not allowed.
Response: The spreadsheet has been updated to correct the negative number. The
spreadsheet has a formula in it that zeroes out a negative response when calculating
the HGL's so it was previously calculating the correct HGL while still showing a
negative number. We have updated the spreadsheet to read 0 as opposed to the
negative value.
6. Sheet C-11, Why isn't LAT S-2 centered at the connection to Line SD -S?
Response: Centering the pipe requires LAT S-2 to have a slope less than minimum.
Pipe has been adjusted to match the flow line.
7. Sheet C-11, Marked flow lines on Line SD -R as incorrect.
Response: Flow lines were double checked and were reading correctly. Pipes are
matching crown elevations and therefore the difference in the flow line of those pipes
should be the difference of 33"and 21" leaving 12" which matches what is shown on
the plans.
8. Sheet C-38 Label Westhaven Ph. 1 insert sheets as "For Reference Only (TYP)
Response: Sheets have been labeled as requested.
Please contact me at (972) 335-3580 or mike. molgeakimley-horn.com should you have any
questions.
Sincerely,
Mike Molge, E.I.T.
5750 Genesis Court, Suite 200, Frisco, TX 75034
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EDEN 8.7
� i \ 28 7.6 cfs \ 8.7 cfsfs
\ \ \ STREET 25
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3 \ \ 26 BLOCK E
\ \ I 23
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25 9 / BL CK D -1(suB
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\ \ LCT 3X 0.7,
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STREET CAPACITY EXHIBIT
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DRAINAGE AREA TABLE
DRAINAGE AREA
AREA
NO. N.)
RUNOFF
COEFFICIENT
COEFFICIENT
RAINFALLTIME
INTENSITY
•1.100 "r)
OF TOTAL FLOW
CONCENTRATION
(Mauler) 0100 (ch)
0-1
IA2
0.65
7.56
15.0
7.0
0.2
0.91
0.65
7.56
15.0
4.5
0-2(SUB)
0.14
0.65
7.66
15.0
0.7
R-1
1.78
0.65
7m
16.0
8.7
R-1(SUB)
0.70
0.65
7.56
15.0
3.4
R-2
1.89
0.65
7.56
15.0
8.3
R-2(SUB)
0.10
0.65
7.56
15.0
0.5
S-1
0.57
0.65
7.56
15.0
1 2.8
S-2
1.54
0.65
7.56
15.0
7.6
S2(SUB)
0.84
0.65
7.66
15.0
3.1
U-1
1A2
0.65
7.56
15.0
7.0
V-2
1S3
0.73
7.56
15.0
8.5
V-3
0.68
0.80
8.68
10.0
4.9
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