HomeMy WebLinkAboutCDP 2018-0019; SNYDER RESIDENCE; DRAINAGE REPORT; 2019-02-12WUNDERLIN ENGINEERING, INC.
DRAINAGE REPORT
CDP2018-0019
GR2018-0053, Dwg 515-8A
1781 SKIMMER COURT
CARLSBAD, CA 92011
A.P.N. 215-050-57
For
JAMES SNYDER
10612 PROSPRET AVENUE #101
SANTEE, CA 92071
-----------::.-__ 10~
1-tto ~
~-------=-----"'----""--~"'-Q . rt-\ 'J
ichael A. Wunderlin date 26671
R.C.E. 26671, exp 3-31-2020
P.O. BOX 461300 • ESCONDIDO, CA 92046 • tel (760] 644-2944 • email: WUNDERLIN@EARTHLINK.NET
DRAINAGE REPORT
CDP2018-0019, A.P.N. 215-050-57
1781 Skimmer Court
Carlsbad, CA 92011
The Project Site is 1781 Skimmer Court, Carlsbad, CA 92011 being
A.P.N. 215-050-57, a portion of the NE1/4 of the NW1/4 of Section 26, T 12 S, R 4 W,
SBBM, consisting of 1.07 acres.
The Site was an existing single family residence with a detached garage. The house
was totally destroyed by fire and the detached garage remains.
The Proposed Project is to remove the burn down house foundation, pavement and
debris, then build a replacement house and driveway.
The existing Impervious Area of the burn down house foundation, patios & driveway
area is 10,120 s.f. There will be 7,763 s.f. of Impervious area removed. There will be
4,600 s.f. of new replacement impervious area see the "Impervious Area Exhibit".
The Impervious Area for the Project will be decreased as shown. For the drainage
calculations we will assume the C is unchanged.
There are two drainage basins which are considered as shown on the attached
"Drainage Area Exhibit". The Pre Construction Drainage Area is the same as the Post
Construction Area. The replacement house will be constructed the the existing building
pad from the burn down house.
Area 1,
0.19 acres consisting of the northerly portion of the existing building pad and a small
area lying to the north as shown on the Drainage Area Exhibit. The drainage pattern will
remain unchanged and is directed to the northeasterly corner of the existing building
pad. A vegetated swale and rip rap are being added as shown.
Q 100 =CI A
A = 0. 19 acres
I = 5.0 in/hr
C = (.05 ac x 0.9 + .14 ac x 0.4)/2 = 0.53 note: 0.9 for pavement, 0.4 vegetation
Q 100 = 0.50 cfs
Area 2
0.15 acres consisting of the southerly portion of the existing building pad and a small
area lying to the south as shown on the Drainage Area Exhibit. The drainage pattern
will remain unchanged and is directed to the southeasterly corner of the existing
building pad. A vegetated swale and rip rap are being added as shown.
Q 100 =CI A
A= 0.15 acres
I = 5.0 in/hr
C = (.06 ac x 0.9 + 0.09 ac x 0.4)/2 = 0.60, note: C soil= 0.4, C paving & roof= 0.9
Q 100 = 0.45 cfs
~-., DRAINAGE AREA EXHIBIT'
, .__ _ / , , CDP2018-0019, APN 215-050-57 ......_____
I · ~ · .. \, ·.. · ··" · 1781 Skimmer Court
. oosr. mo: /-c _·. _. _· \ \ -, '.,. · ~ Pre~~onstruction Area = Post Construction Area
• / .......__ · · N89"-1947" 435.d Area 1 = 0.19 acres .
, \ l'ffJPra/ lJ!IE .......__ ....________ \ i. <. 0, ·. _ _ _ PROi'El!1Y llflE \ Area 2 =_ 0.15 a~res IE\::! _ __
. '. \ . ~ . ·. \. .
I .--~~~~~~~~~~ · .. _ . _. --\ ·_ -\ ·. \_ . ', :
\ . 7 . ·. ·. \ ' ' ~ -\--·-. ·. \----
\_ } ~~~~~~~~~~~~'1 ' ·._ %\-'•.· ~-' ·. ·:) \ ·, \ ·, .
· 1s ___,,,__.~~ . ~ : ~ : I . : , l --\\'~ ----·~_;--~ \ -~~~/:; :~ . l' i :_. ",.
-.. '~ ·,
.C •
ATER •. /-
' P.ltV._,,..,,...' "y4·.
iT. IIAILIDX___µ.----: ': :
~-' .' I
·-/
(t
~-,,
t.
\ -
8!:-' ,,,, -
. . \ .. '-ti .-~· -~--' . \'io, :;_I . '
" ,;
-~ \
' ~ . .r.'3--/ :r i;i
. ----~ ",
_<f
•-.
EXIST. ,._C.
·-.::..
• WALL TO ~ REMOVED r.f'••-~ ~
---'l.eil----
, I_ • . ~ ' : • T: . '\_
--,~ _; ~ ·, I . . ! . '1!, , "" . . . '
1 \ _..-::;y 'fflS euk>IN F1lE . t1 · . '\. I , TO IE ~-. ' . •. • • · '\. .
0 \· ·, ' \ ·, •. ' "'"' ' •. '\. -\ 1 ~ • ' , • I . • . •;. ' . . . . '\. ·-.
I -_ ~ ~
u1 .. I \·. ·'; l _;) -,
' . •· I \. --. \ '. '. \ ·,
I ' I i~ ·., \ \ ·-,. /_:' .. ·. . I EXISf. GAAAGE
10REMAIN
7'
I
/ : I , I . ; . -_ L _j -\' ,·,\.! --;
~ : ;~-.. ~-~-------~--~ -r ---\; --.__ --:
' • : ---------... EXJST: ... _c. ;.
'j ·, \ ' . \ .
'::I 0 "-~-~--~ ~--~ ;.. ~ ---------~-----
EXIST. A.C. PROPµl!Y LINE
-... -· ---_ 1fl15f. SCREEN WALL·-... .,_ __ ···--, · .. ·--·,-c.: ..... _ _ _. _: --,· ··· --· ,----· '\_
__ __ _ ____ ____ __ _ ~--..::_-··::.::.."'<-•. ~. _ -~~so'o+'E 435.os· ~-l-_ _ _ ___ __
_, · • a . so e: ---~....::.:.=cir-~-~· _··-___ --:--: ·:;.___ -·-. ~ ------,··-:=· ··.: ~---. · ._
EXIS[ WROUGllT RON ffJCf:_J ~---.. · .. -.... _ ----... •. ·----. • '\
. ---~ ~~-~~ ~;---_ -~~ -~---~-.. -. ' " '\
\
\
\._
/ '
,. \.:
' ~/ /"I
. '\'
IMPERVIOUS AREA EXHIBIT
CDP2018-0019, APN 215-050-57
1781 Skimmer Court '-------
Existing Impervious Area (Pre-Construction) = 10,120 s.f. /I -, --~ -i"' --. ---F( --.---: ; I -----Impervious Area Removed = 7,760 s.f.
,--~--#-_ .::::·"'-'-~ Post Construction Impervious Area ~ 4,600 s.f.
r~Yw;;.,-R\-~-~1-~-V----V y ~· y --:-~·O?: ~ -\-· ~--· ·\-.. _'\f--:
. % . ' \ ' ' )
...... . \ ·. : ' I ;: · ; I ; '. ; '. ~:
~EXIST. FENC< • / ; ; • I : ! ' ' I ' I '· . '
-,_
J
\l ,·, ', TO 1£ RfM(11EJ)/ ' V ' I • \ • ' •,' ""
. \ / ,': ; ; ~ '., . . ' . ·., "'-' . . ' .
.\
.. ~, ·~:.'¢ .... \
·. 0 .
'ER \\7-
P.R.v.~·· ...
A ' :
y ~\
; '
ll.llLBOx-----<i ::
lB, GUmR .' ; -~,
~: -:· : ,: /' :
·:-
/
·~
',
·.:.:
'·-
'!REES. Ill FW:; i t:. ·,,. ' . '. . ·. ' ._'\_ m,a, '. ·-._". <~'.
I --~
\ ! _;). .
I '. \ '\ I; ,r
\ \ \_ .\ ·,. I :'
I \ \ J'. EXIST. GARAGE lOIEIAIN
•:\\'.. ·,l : i._ ._J-...:...:,_ __ _
·. • I ----J.A, ~--·-.
I ;!? ..
,,·-,
-,---~-/'o
~f'g ~ () ~ •";°) \ rf'RD~ LINE
-
-:-::----L------___c;;:~==~=--===~=e==-.........a~~=::c,--:=......-...&;I.,,.,........; ·:·_: ---=. _ .. -------------... ·-· ·---· .. --·-------· ... -. . ----
-..... ---=c 'J" ~--= ~-~~-;;,;;~ ~ 1""' "'"'-"==;;: · . ? ;:=: "2::~~_:' ~;~-::: ::¼:· +;~ \--•"·~---'.~--· ..
EXISf. YIROUGIIT IRON IIllCE ~ :::::::, -•• -___ ··-__ ---•. '-. ·-.,~ -•• _. ', . .
----·----~-~-~ -.::: . ---. ·--... _ ~;~ ·--·, .. '