HomeMy WebLinkAboutMS 05-12; PACIFIC SUNSET CONDOMINIUMS; HYDRAULIC CALCULATIONS FOR PACIFIC SUNSET CONDOMINIUMS; 2006-10-18HYDRAULIC CALCULATIONS
FOR
PACIFIC SUNSET CONDOMINIUMS
DATE: October 18, 2006
PREPARED BY:
SAN DIEGO LAND SURVEYING AND ENGINEERING INC.
9665 CHESAPEAKE DRIVE, SUITE 445
SAN DIEGO, CA. 92123
CITY OF CARLSBAD
Project No. CP 05-05 / SDP 05-06 I CDP 05-09 I TPM 05-12
ENGINEER OF WORK:
MICHAEL L. SMITH, RCE 35471
MY REGISTRATION EXPIRES ON
9/30/2007
dfOFESSio%
CO CD rn
cc R.C.E. 35471
..\ Exp. 9/30/07 J.
HYDRAULIC CALCULATIONS October 18, 2006
PROJECT: PACIFIC SUNSET CITY OF CARLSBAD
PROJECT DESCRIPTION: THE SITE IS OCCUPIED BY A SINGLE FAMILY
HOME. THE SURROUNDING AREA IS DEVELOPED WITH SINGLE RESIDENTIAL
UNITS AND MULTI-FAMILY RESIDENTIAL DEVELOPMENT. THE SITE DRAINS
NATURALLY TO THE SOUTHWEST AND SOUTH. PROPOSED IMPROVEMENT
CONSIST OF MINOR GRADING, THE CONSTRUCTION OF 4 RESIDENTIAL UNITS,
PARKING AND SURFACE FLOW DRAINAGE. FOR DRAINAGE AREAS SEE
ATTACHED 20 SCALE DRAINAGE AREAS MAP.
EXISTING ZONE El: AREA = 0.1781 AC.
RUNOFF FOR SINGLE-FAMILY RESIDENTIAL DEVELOPMENT C = .55
TIME OF CONCENTRATION: FOR SMALL DRAINAGE AREAS USE 5 MINUTES
INTENSITY (100 YEAR STORM) FROM EQUATION ON APPENDIX A = 4.40
Q = C x I x A = .55 x 4.40 x 0.1781 AC. = 0.43 CFS
THIS SITE WATER IS COLLECTED IN AN INLET OR ROOF DRAINS DISCHARGES
THROUGH THE EXISTING WALL. IT IS CONNECTED TO THE EXISTING
OFFSITE STORM DRAIN SYSTEM.
OFFSITE RUNOFF (ADJACENT 6 UIT DEVELOPMENT) ALSO DRAINS INTO THIS
PIPE SYSTEM. FROM HYDROLOGY STUDY FOR THAT PROJECT, 0.60 CFS
DRAINS TO THE EXISTING STORM DRAIN SYSTEM.
TOTAL RUNOFF IN PIPE = 0.60 + 0.43 = 1.03 CFS
STORM DRAIN DESIGN:
8" PVC GRADE = 1.00% N = .011 Q = 1.03 CFS
Dn=5.0" . V=4.45F/S
FOR CALCULATION SEE APPENDIX B1
EXISTING ZONE E2: AREA = 0.0839 AC.
RUNOFF FOR SINGLE-FAMILY RESIDENTIAL DEVELOPMENT C = .55
TIME OF CONCENTRATION: FOR SMALL DRAINAGE AREAS USE 5 MINUTES
INTENSITY (100 YEAR STORM) FROM EQUATION ON APPENDIX A = 4.40
Q = C x I x A = .55 x 4.40 x 0.0839 AC. = 0.20 CFS
THIS STORM RUNOFF WILL SHEET FLOW, ACROSS A PLANTED AREA WHICH
WILL FILTER THE RUNOFF, TO CARLSBAD BLVD.
TOTAL RUNOFF .FOR EXISTING CONDITION IS 0.43 + 0.20.= 0.63 CFS
PAGE 2
PROPOSED ZONE P1: AREA = 0.1420 AC.
RUNOFF FOR SINGLE-FAMILY RESIDENTIAL DEVELOPMENT C = .70
TIME OF CONCENTRATION: FOR SMALL DRAINAGE AREAS USE 5 MINUTES
INTENSITY (100 YEAR STORM) FROM EQUATION ON APPENDIX A = 4.40
Q = C x I x A = .70 x 4.40 x 0.1420 AC. = 0.44 CFS
THIS STORM RUNOFF COLLECTS IN THE DRIVEWAY AND PARKING AREA AND
DISCHARGES TO AN EXISTING GRATED INLET IN THE ADJACENT PROJECT.
OFFSITE RUNOFF (ADJACENT 6 UNIT DEVELOPMENT) ALSO DRAINS INTO THIS
PIPE SYSTEM. FROM HYDROLOGY STUDY FOR THAT PROJECT, 0.60 CFS
DRAINS TO THE EXISTING STORM DRAIN SYSTEM.
TOTAL RUNOFF IN PIPE = 0.60 + 0.44 = 1.04 CFS
STORM DRAIN DESIGN:
8" PVC GRADE = 1.00% N = .011 Q = 1.04 CFS
Dn=5.0" V=4.45F/S
FOR CALCULATION SEE APPENDIX B2
PROPOSED ZONE P2: AREA = 0.1150 AC.
RUNOFF FOR SINGLE-FAMILY RESIDENTIAL DEVELOPMENT C = .70
TIME OF CONCENTRATION: FOR SMALL DRAINAGE AREAS USE 5 MINUTES
INTENSITY (100 YEAR STORM) FROM EQUATION ON APPENDIX A = 4.40
Q = C x I x A = .70 x 4.40 x 0.1150 AC. = 0.35 CFS
THIS STORM RUNOFF WILL SHEET FLOW, ACROSS A PLANTED AREA WHICH
WILL FILTER THE RUNOFF, TO CARLSBAD BLVD.
TOTAL RUNOFF FOR EXISTING CONDITION IS 0.44 + 0.20 = 0.64 CFS
TOTAL RUNOFF FOR PROPOSED CONDITION IS 0.44 + 0.35 = 0.79 CFS
THIS IS AN INCREASE IN 0.15 CFS. TRULY AND INSIGNIFICANT AMOUNT
OF STORM WATER.
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