HomeMy WebLinkAboutCDP 16-29; LINCOLN RESIDENCE; DRAINAGE ISSUES LETTER AT 5198 SHORE DRIVE; 2019-07-26tçP
ONI Duca McCoy, Inc.
Corona Del Mar, CA. 92625
Telephone 949-675.4487
Fax 949-675-4456
July 26, 2019
To: City of Carlsbad
Engineering Department
Attention: Mr. David Rick
Associate Engineer
Subject: Drainage issues at 5198 Shore Drive
Dear Mr. Rick:
This letter is in response to the question of drainage blockage of the properties at
5185 and 5195 Carlsbad Boulevard due to the new construction at 5198 Shore Drive. As you are aware,
openings have been provided on the new grading plan wall design to prevent blockage of any
surface drainage from the above referenced properties. If you would refer to the attached plan,
the area of both referenced properties plus the half street of Carlsbad Boulevard would be
' approximately 0.46 acres resulting in a Q of 1.17 cfs. As noted on the plan, there will be seven--3" x 6" wall openings in which each opening can accommodate 0.27 cfs. Thus the seven
wall openings will be able to handle a Q of 1.89 cfs.. .substantially more than the Q of 1.17 cfs.
Additionally shown on the plan is the additional portion of the Carlsbad Boulevard half street
(roughly 243'x 50') if it was to drain towards 5198 Shore Drive that could be accommodated b
y
the seven wall openings (1.89 cfs).
Hopefully this information addresses the issues of blocking the drainage as referenced ab
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If you have any questions or concerns plóase feel free to call.
Very truly yours,
QAL\r'LL _ Pete J. Duca, P.E.
R.C.E.24668 t14 Duca McCoy, Inc -..
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Rectangular Channel Analysis & Design
Open Channel - Uniform flow
of Worksheet Name:
- -
Comment:
Solve For Discharge
Given Input Data:
Bottom Width 0.50 ft I ui W211 Maxning's n 0.012 Channel Slope 0.0050 ft/ft — Depth ............ 0.25 ft
Computed Results:
Discharge........0.27 is c f s velocity ......... 2.19 fps Flow Area........0.13 Sf Flow Top Width... 0.50 ft Wetted Perimeter. 1.00 ft Critical Depth... 0.21 ft Critical Slope... 0.0080 ft/ft Froudé Number.... 0.77 (flow is Subcritical)
.07 one it Ic rr wIL
O21x7 -- I - 8 0 4-C
* d,i4i 4 44,,L1
(A'OL'14 L7 OsI
(u. flRs& p ,.c) .
Open Channel Flow Module, Version 3.42 (c) 19
9
1
Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708
Rectangular Channel analysis & Design
Open Channel - Uniform flow
Worksheet Name:
Comment:
Solve For Depth
Given Input Data:
Bottom Width 3.50 ft I WLf1I Of '7 ep2b1s 1f/ (3'ko) Manningts n 0.012 Channel Slope 0.0050 ft/ft Discharge ........ 1. 17 cfs g r 46
Computed Results:
Depth............
Velocity.........
Flow Area........
Flow Top Width...
Wetted Perimeter.
Critical Depth...
Critical Slope...
Froude Number....
0.15 ft
2.30 fps
0.5]. sf
3.50 ft
3.79
0.15
ft
ft ° tkt4i '1' teii
0.0044 ft/ft
1.06 (flow is Supercritical)
cb & 05 %O46
, I'll q11-
Open Channel Flow Module, Version 3.42 (c) 1991
Haestad, Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708