HomeMy WebLinkAbout3205; CARLSBAD BLVD WIDENING PHASE 3; COSTAL STORM DRAIN STUDY; 1984-04-01rp -
Table of Contents
Page
Report Summary ...............................1
Chapter 1 Introduction /Scope and Area of Study 4
Chapter 2 Description of Existing Facilities . 5
Chapter 3 Bluff Erosion . . . . . . . . . . 38
Chapter 4 Needed Repairs o ................. 41
p
Chapter 5 Master Facilities ................45
..List of
--
Tables
-
Page
2-1 Summary of. Subareas • - ............6, 7
4-1 Needed Repairs to Existing Drains .........- 43, 44
5-1 Summary of Cost for Master Drainage System . . 46, 47,
48, 49, 50
:-
List of Figures
-: Page
ES-i Coastal Storm Drain .. . Areas . . . . - 2
5-1 through 5-4. Master Drainage Facilities... . . At Back
of Report
- - - . -- -V
Report Summary
The storm drains serving the 'beach area of Carlsbad were
neither designed nor constructed systematically. Each drain
collects water from a small area and carries it directly over
the bluff and onto the beach. Due to the steep slope of the
drains descending the. bluff, drain failures cause severe
erosion. If the present system of drains is not replaced,
periodic failures and the concomitant erosion should be
expected. -
This study, breaks coastal Carlsbad into five separate
strips, from north to south, labled Areas ,A through E. The
Areas are shown in Figure ES-1. A discusson of each area
follows.
Area A
Area A extends from the Buena Vista Lagoon weir on the north
to Oak street on the south. ' In this area buildings extend from
the top of the bluff to the beach area. Bluff erosion is not a
major concern because nearly all the beachfrorit land in this
area has been developed.
'During the winter of 1984, the city improved two of, the
drains in this area. All of the drains should now be adequate.
The only improvements currently needed in this area are curb and
gutter to eliminate nuisance puddles and provide a course for
water to reach the existing 'drains.
'AreaB
All land adjacent to the ocean, in area B is, part of the
state park system. - ,Area B extends from the parking lot south
of, Oak. Avenue to the Agua Hedionda Lagoon bridge. This area is
known as the Whale Watch area.
Area B contains fifteen, storm drains, 'which are spaced
closer together than those in any other area is Carlsbad
There have been many drain failures in this area and there will
continue to be failures in the future.
To minimize erosion, the present Area,B system should be
replaced with a single drain parallel to the ocean. This
parallel drain would cost $572,000. To repair the existing
drains to original conditions would cost $187,000. If the
drains were repaired 'to original conditions -future failures
could be expected due to wave action.
Area C
Area' C, known as the Terra Mar area, extends' from the power,
plant outlet at the south end of Agua Hediond,a north -to Cerezo
Drain. This area 'contains very few storm drains and, like
Area A., is developed with single family homes, constructed on
the bluff..
The' storm, drains in the developed area west, of Carlsbad
Boulevard are adequate. However ',.1 a 'master drainage system is
needed for the areas east of Carlsbad Boulevard and. 'for portions
of Area D (see below) which drain north', through Area C. To construct a master drainage system to serve this area would cost
$495,000. To repair the existing drains to original conditions
would cost $7,500. Even, with repairs to' original conditions,
future drain failures could be expected.
Area 'D
Area.D extends from Cerez'o Drive south to the Encinas Creek
Bridge. All land adjacent to the ocean in 'this area is part of
the State Park System. ,The state land has not b,een improved for
use as a park. Beach access is difficult and, in some areas,
impossible. The, storm drains in this area are all old with no
evidence of recent repairs.
A master drainage' system shbuld''be installed in this area
when it is developed as a park. Eliminating the present system
and replacing it with a single drain par ,aliel to 'the ocean
would cost $206,000. To, repair the existing drains to original
conditions would cost $237,500. Repairing the drains to
original conditions would not prevent 'future failures. Some of
the drains, in this area serve only state park land.
Area '•
'All land 'in. Area E adjacent to the ocean is part of the.
State Park System, and is entirely developed' as a' campground.
Area E extends from 'Encinas Creek on the north to Batiquitos
Lagoon on the south. • The bluff, in, this area is quite high and
all access to the beach from the carnpground is by stairs. This
is the' only area containing storm drains larger than 18",
although it' also, contains, many smaller undersized drains.
• There has ,been substantial erosion from some of the smaller storm
drains, but 'the larger drains have caused little erosion. Most
of the smaller drains serve only state park land.
'
,0
To eliminate •the 'present area,:storm drains and replace them
with, a master drainage system would cost $1,264,000. The master
,drainage system for this' area 'would require two major drains,
Li
•. ,one . serving the northern half of area E and one serving the
southern half. If the drains in this area were repaired to
original condition 'it would cost $97,000' and future failures
could be expected
-3-
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COASTAL STORMDRAN
\. AREAS 1'.kcNk'.
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Chapter 1
Introduction / Scope and Area of Study
This report evaluates the existing Carlsbad coastal storm
drains, including a listing of repairs needed to existing
existing drains, an identification of drainage basins, and the
development of a master coastal drainage system.
The area of study is bounded on, the north by Buena Vista
Lagoon, on the south by Batiquitos Lagoon and on the west by
the ocean. The easterly boundary of the study area is set by
drainage. All drainage basins which enter the ocean directly
are addressed in this report. ••
A portion of this report will also be dedicated to bluff
erosion and the design of future storm drains to limit erosion
I
p
- •
• • • •
•
•
•
•4 '
.•
Chapter 2
Description of Existing Facilities
Coastal Carlsbad has been divided into five major drainage
areas for the purposes of this study. These 'five areas were
further divided into various 'gravity ,drainage subareas. The
following pages describe the five major areas and provide a
description of the facilities serving each sub ,area. Table 2-1
lists the area, outlet pipe size, 100-year 'storm flow and outlet
pipe capacity 'for each of the subareas.
Area A
Area A extends from the weir on Buena Vista Lagoon on the
M ' north to Oak street on the south. In this area there are
buildings, extending from the top of the ' bluff to the beach
area. Bluff erosion is not a major concern in this area
because nearly all the beachfront land in this area has been
developed. ' Erosion from both wave action and storm drains at
times endangers structures and thus property owners in the area
must take preventative measures to protect the structures. The
old storm drain ' facilities on the roads above the bluff were
inadequate. At the present time construction is underway to
install new storm drains to convey water from the roads to the
beach area. This, however, will not solve all the problems.
The roads in this area do not have curb and gutter. After
rains, the water tends to puddle along the edge of the roads
and only the overflow from the puddles is able to flow along
the roads and into the storm drains. The new storm drains will
not improve the situation since the water still will ,not be
able to make its way to the drains. The puddles are a consider-
able nuisance in the area and we recommend that a program be
developed to install curb and gutter in this area.
There are approximately ,25 acres in area A. The 25 acres
are broken into, 4 subareas and these 4 subareas are described
below. '
A-i This, subarea contains 2.7 acres. It is served by
an 18" PVC (Polyvinyl Chloride) outlet pipe with
0-ring joints which was installed during the
winter, of 1984. One inlet serves this subarea.
The pipe runs to the beach at the north end of
Ocean:Street, adjacent to the beach access stair-
'ways. ,The majority of this subarea has curb and
gutter.
A-2 This subarea contains 9.9 acres. It is served by
an 18" AC (Asbestos Cement) outlet pipe which was
installed during the winter of 1984. Two inlets
serve- this subarea. The pipe runs to the beach
at Cypress Avenue.
--
9
TABLE 2-1
- - SUMMARY OF SUBAREAS
Flow Generated Outlet Outlet Undersized a
Area/Subarea Acres .(CFS) Pipe Size .` Cpacity Pipe
S ' 2.5,CFS/Ac,re and Type . . (CFS) . Capacity/<18"
A 1 - 2.7 .6.8 18" PVC*
2 : '- 9.9 - 24:8 18" AC . 25.5
3 95 238 18". AC 265
4
5
2.9, 7.3 . 12" avip . 7:9
.25.0 Totals
1 ., 6.0 15.0 . Varies
- . 2. - - 47 -. - 11.8 - Unknown .. .
-
.
.. 3 55 33 - ,..8.3
-
18". PVC : .26:5 . . ..
- - .4 3.4 8:5 . •. - 18'• PVC 26.5
,. .
. - -• ,
r 5 79 198 18" AC 265
6 5.8 -,14.5. 18" PVC 26.5
- .7 - . 5.0 - 12:5 12T CVI . 7.9. - (18", CAP
- .8 12.8 - . 32.0 --
Ovrland.'
5 9, 1.0 - : 2.5 - Varies -. - -
'.49.9 Totals - -
C 1 -- 2.1 5.3 -: Varies
2 - -- 14.9 -
373 . -
. Overland
-
5 3 - •• 3.8 -
9•55
-
- 18" RCP ' 26.5.
4 '3:8 ' 9.5: - . V-ditch - - -.
-
. -
3.0, , 7.5 5 - - Ukbown
- Totals ' 27.6. . .
'S
• •
-, '
..-
5. - - . 5.
-S - .
- -
•. 5 .- "S 5_'
5 '
S
-
S
5,, . S S' - S. 55 •S - -
-6-
TABLE 2-1
OF SUBAREAS (continued)
Flow Generated Outlet Outlet Undersized a
Area/Subarea' Acres (OF'S) Pipe Size Capacity Pipe
@ 2.5 OF'S/Acre and Type (OF'S) Capacity/<18"
D 1 12 9 32.3- 18" RCP 26.5 CAP
2 S 7.4 18.5 Varies - - -
3 1.3 3.3 Unknown
J3
4 7 1.8 12" a1P 7.9 <18"
5 43 108 18"OMP 265
6 '13 33 '
1811 (w, 265
7 -9 2.3 T 18" DIP 26. 5,
8 1.3 3.3 18" alP 26.5
9 5 13 Overland
30.6 ' ii Totals
E 1 9 23 18"QIP 265
2.6 "' 6.5 '. 8" PVC 3.5 <18", CAP
3 SP 1.7 4.3 8" PVC 3.5 <18", CAP
4 14.9' 37.3 24" oT. 47.1
5 -, - 2.7 6.8 8" alP - 3.5 <18", CAP.
."8.8 SP 6 3.5 8" alP 3.5 <18", CAP
7 s 43 108 8" PVC 35 <18",CAP
8 37.9 94.8 24" PVC 47.1 CAP
9 S) 1.7 4 3 Overland - - -
10 69.5 173.8 -'- '30" CMP . - 7316 'CAP -
lisp 1 1 2.8 Overland - - -
140.8 1 Totals
a CAP in this column indicates that the existing pipe has insufficient
capacity to serve the drainage basin <18" indicates pipe is smaller
- , than the minimum recommended size of 18". -
SP indicates drains that begin and end on State park land
'-7-
A-3 This subarea contains 9.5 acres. It is served by
an 18" AC outlet pipe. This pipe was installed
currently with the construction of the adjacent
hotel in the 1970's. Three inlets serve this sub-
area. The pipe runs 'to the beach at Christiansen
Way, adjacent to the beach access stairway.
A-4 This subarea contains 2.9 acres. It is served by
a '12" CMP (Corrugated Metal Pipe) outlet pipe.
This pipe was probably installed in the 1960's.
One inlet serves' this subarea. The pipe runs 'to
the beach at Elm Avenue, adjacent to the beach
access stairway. This drain may need replacing
in five to ten years.
Area
All land adjacent to the ocean in area B is part of the
state park system. This area extends from the parking lot south
of Oak Avenue to the Agua Hedionda Lagoon bridge. This area is
known as the Whale Watch area..
There are a large number of storm drains in this area
There are several generations of storm drains, some of which
are abandoned. As development proceeded in this area new storm
drains were installed and the old on'es were either abandoned in
place or utilized to carry water from smaller areas. Bluff
Nil erosion in this area is substantial. Two storm drains in this
area were replaced and repaired this winter by the City when
erosion threatened Carlsbad Boulevard. In this area all the
drains have a very steep slope as they leave the roadbed and go
over the bluff. This area also has heavy foot traffic over the
slope. Both of these factors contribute to erosion in the area.
Although there are a large number of storm drains in this
area, there does not appear to be a uniform drainage system.
Each pipe serves a small area and nearly every pipe has caused
bluff erosion. This is an area which has needed and will
continue to need emergency repairs as storm drains fail. A long
term drainage solution is badly needed in this area.
This area contains approximately 50 acres, and 9 subareas.
The majority of the major drains in this area seem to have.been
installed concurrent with adjacent road improvements.
B-1 This subarea contains 6.0 acres. It is served
by two separate corrugated metal pipes. One of
the drains has a single inlet and serves only a
small area on the west ' side of Ocean Street.
The, other drain has two inlets and serves the
majority of the area. Both drains have 12"
outlet pipes. The age of these pipes is
undetermined. Both pipes enter the beach area
from the parking lot along Ocean Boulevard
-8-
. -- - S - •-._ - 5 -
__5_• S. -- • . - S - - S -
- 5• S 5 - - S. S S
- . - S S - 5 - 5
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2 4.
B-2 This subarea contains 4 7 acres It is served by
a single corrugated metal .pipe, but the outlet
could not be,. found due to a heavy growth of
bamboo It has two inlets, one on each side of
Pine Avenues at Carlsbad Boulevard The age of
this pipe is undetermined Repairs are urgently
needed at the out-let"".due to bluff erosion The
bank appears 2 to --.-.;b e supported bY b the bamboo -
.grow,th This pipe drops to the beach at Pine
Avenue
- 4
B-3 This subarea contains3 3 acres It was origi-
nally served by a 15" RCP pipe The outlet pipe
was repaired and eroded bluff replaced - in -the
winter of 1984 The pipe material used for -
replacement was PVC with 0-ring joints This
pipe has two inlets, one on each .side ,of Walnut
Avenue, and reaches the beach at an extension of
' Walnut Avenue The repaired pipe is shown below
1 r - -
fA
-
L
- .
- - Z 4t4!5
-
4 - -
Aq
U -. - -
4. - •'.. NL ±
211
"
- -, .\ - -•• - ..' -
f
-- ---. .-•419 • 124 •-
-
41
(
-
I - 4
2;
r 10
: :
B-4 This subarea contains 3 4 acres The pipe is fed
7 I by two inlets, one on -each,,*-side of Sycamore
Street, and it drops to the beach at Sycamore
Street The outlet area was repaired during the
winterof 1984 The outlet -is shown below
4 4 U - -
1•
-
VI
• ,- p.- - F
- ••• -'--- -
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4.
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.4. -- - - ,- -- - -. - - - -- s it
.. --- - - -4- -4 --
-
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D
( * +
-.• -.'- : -- ,- ,
-
sk
B-5 -This subarea contains 7 9 acres It is served,.by
'an 18".-AC outlet pipe The pip is feed by tw0
inlets, one on each side of Maple Avenue,
-drops to4 4the ocean at Maple Aveiue The pipe was
repaired and f erosionrei1led recently, as can be
seen inthe picture below it
- -
I
: : -:
- 7 -
- 55
• 5' 'S.
- I 55A
is S •S SS S• - - is. ' - - 555 S•
-
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57 -
is
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-
B-6 This subarea t contains 5 8 acres It"is served
by an 18" PVC'pipe with 0-ring joints The pipe
is fed by fourin1ets along the east side of
Carlsbad Boulevard.-_:.,T outlet pipe was Lrepaired
and-',-erosionf refilled during .-the winter of 1984
Thisipipe drops to the ocean Just south cif ',Acacia
Avenue - - .
Si•, ,.is
-• ..... -
... ..B-7 5 .This. subarea -contains5.. acres..' It. is -served 4.by,
S.
-
a 12" CMP outlet pipe The pipe is fed by a
single inlet along Juniper Street and drops to
the ocean atJuniper Street The outlet pipe is
exposed, as can-'seen in th& pictures 'below
.• -'--
'-: -•-.--: 5; 5555 7 5 •-f .:-Si --.,' .'' ''-''•'.
5; . -. - ¼ SSS45 S - - 5_•5 • 5,.S I
, 12,
-4 4
3 & 4
4
-
'
: -.-: . :.. • -••.. 4.-. 4_ --..--,,. . I. ::'
-
. 4 . ' • - . - * 4 . • - 4• - . . 4$
e
SOM RIM SOM
-4-
4
14 ,
I -
- -
.4 4
4
.' 44 - -4 - 4t(_ •_" - ..- •t.f' 44
-4
4-
- - -
4
- -
-..A- '.
- -c-- ç - - -
B-B Thissubarea contains "12..-.8 acres Storm waters
flow overland and follow the east side of Carlsbad
Boulevard to Agua Hedionda -
- - ;.-. •. 4. '-s. -4 - . - - -. - • . - r .
- P - . B-9 This subareacontainsapproxirnately one-acre It
is composed of -asmall strip of land along the
west side of Carlsbad Boulevard There are-seven
- storm drains which serve this area Although th&
f ) contributing r h d drainage aea to eacrain is
small, there still considerable erosion from 4is
these drains .-
*Also . ,there appear .to be some low
spots in the Carlsbad Bou1evardcurb whicIa1low
water to escapeover the side -of street and
down the bluffs -The locatlon/ as well as a
description of each drain, is listed below the
following pictures of the drains
- .- .**--..-,- . .*. 4 •-4j) '...- - . - .- 4
'13-
- . - . - .- . . -_.• -
B-9c 50' south of Sycamore 10" CMP
B-9d 100' north of Maple 10" CMP
-15-
0-~
4,
Area C
Area C extends from the power
p
l
a
n
t
o
u
t
l
e
t
a
t
t
h
e
s
o
u
t
h
e
n
d
of Agua Hedionda to Cerezo Dra
i
n
.
T
h
i
s
a
r
e
a
c
o
n
t
a
i
n
s
v
e
r
y
f
e
w
storm drains and much of. the a
r
e
a
i
s
s
i
m
i
l
a
r
t
o
A
r
e
a
A
.
A
l
a
r
g
e
portion of Area C has been de
v
e
l
o
p
e
d
w
i
t
h
s
i
n
g
l
e
f
a
m
i
l
y
h
o
m
e
s
constructed on the bluff and m
o
s
t
o
f
t
h
e
s
t
r
e
e
t
s
.
i
n
t
h
i
s
a
r
e
a
have curbs and gutters. The un
d
e
v
e
l
o
p
e
d
s
e
c
t
i
o
n
s
o
f
t
h
i
s
a
r
e
a
to the north need some impr
o
v
e
m
e
n
t
s
t
o
p
r
e
v
e
n
t
w
a
t
e
r
f
r
o
m
running off Carlsbad Bouleva
r
d
a
n
d
o
v
e
r
t
h
e
b
l
u
f
f
s
.
H
o
w
e
v
e
r
,
there does not appear to be
a
m
a
j
o
r
e
r
o
s
i
o
n
p
r
o
b
l
e
m
i
n
t
h
i
s
area. The drainage.basin east o
f
C
a
r
l
s
b
a
d
B
o
u
l
e
v
a
r
d
w
h
i
c
h
f
l
o
w
s
overland needs improvements, but
t
h
e
s
t
o
r
m
w
a
t
e
r
f
l
o
w
s
i
n
t
o
A
q
u
a
Hediorida and not onto the be
a
c
h
s
o
t
h
e
r
e
i
s
n
o
t
a
b
l
u
f
f
e
r
o
s
i
o
n
problem.
This area contains approximate
l
y
2
8
a
c
r
e
s
a
n
d
5
s
u
b
a
r
e
a
s
.
C-1 This subarea contains
2
.
1
a
c
r
e
s
.
is served
by a 15" ..CMP and an 8" CMP
o
u
t
l
e
t
p
i
p
e
.
S
t
o
r
m
water collects along the wes
t
s
i
d
e
o
f
C
a
r
l
s
b
a
d
Boulevard and flows northw
a
r
d
.
T
h
e
s
e
p
i
p
e
s
appear to have been instal
l
e
d
w
i
t
h
h
i
g
h
w
a
y
improvements. The outlet pipes
a
r
e
a
p
p
r
o
x
i
m
a
t
e
l
y
300' south of the power pla
n
t
c
o
o
l
i
n
g
w
a
t
e
r
outlet bridge. The two outle
t
s
a
r
e
p
i
c
t
u
r
e
d
below.
- ..-,-
...: a-•
_;- -. -. - ;. '' '•.• -:.
- -. • -. s-- _••
.-
;.-UNA
----"— ;' e '7--
:.:...i.. '...
C-la 8" CMP
OM
J • . . -.
- -
- - - --
---
-- --•_.-*-_.-_•-•;
-
no ral"; .
93, Wq :i wofilll ;-
-
çJ
IPA, e
C-lb l5"CMP
- - t
C-2 This subarea contains 14.9. acres Storm water
collects along the east side of Carlsbad
Boulevard and flows overland to Agua dedionda
C-3 This subarea contains 3..B' acres It is served
- by án 18" RCP, outlet pipe which - was installed
during.'the winter of 1984 The area it serves
is fully developed with single family dwellings
The outlet pipe is 100' north of.,the southern
end of Tierra del Oro Street
C-4 This subarea contains 38 acres, and is served
by a broad concrete lined surface ditch The
ditchalso'serves asa 4a1kway to the beach. The
-
-• - ditch was -installed with. subdivision' improve-
- . •- --ments. - The' conôrete- -surfac .ditch seems: to
- serve both fu.ntionswell' and'-the ystem 'could.
- -
- - solve problems in ot-het-'areas-of- the -city. The- '
area it serves is fully developed with single
family dwellings The ditch is near the north
end of Shore Drive The ditch is shown below.
8 {_
. '- '-p :- •--t '' - -. '- -.-,'- - -
'-
8
- -• - :- :'- - ' -.-J -. -. .'. - -
19
8' - - '- - - .' • -• - - . - • - -- - -
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4 C5 This- subarea'-contains'3.0 'acres' and is now fully
4 developed with single .-family' dwellings. The
outlet pipe is near the -"Southern end of.S'horè:-
Drive
Area D
- Area D extends from CerezoDrive south to the Encinas Creek
Bridge All larVd adjacent to the ocean in this area is part of
the State Park System The state land has not been improved
for use as a park Beach access is difficult and, in some
areas, impossible The storm drains in this area are all old
and appear to. date, from €he- same time periodY Thus,.. there are -
no abandoned drains as were prominent in area !.'-B. The storm
drains in this area appear,"to be reaching the end of their
useful life and substantial bluff erosion could occur ir this
area in the immediate future if improvements are not installed
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At the north end of this area the storm drain system is
near failure. The system as it was installed conveys water
across Carlsbad Boulevard ' and empties it on the top of the
bluff. The water flows overland across the top of the blu
f
f
and enters three storm drains which carry it over the edge of
the bluff. The Bluffs in this area are quite wide and th
e
storm water appears to spread out over the bluff and not follow
clearly defined paths.to the three drains which convey it over
the bluff. --
The three drains which convey water over the bluff resemble
a dam spillway and carry water over the edge, but do not allow
the water to erode the top of the bluff. However, wave action
has eroded the bluff and the three: storm drains, will soon fall
into the ocean. When this occurs, storm water will go over the
top of the bluff, and without. the pipe protecting the bluff,
rapid erosion of the bluff will occur. Surprisingly, this area
has not experienced much storm erosion and the overland flow
system has worked. The southern end of this area has a few
storm drains and they all need some repair. Storm water erosion
a has left some wide gullies in this area
J This area contains approximately 30 acres and 9 subareas
Most 'of the, drains in this area appear. to have been installed
with the highway improvements. '
D-1 This subarea contains 12.9 acres. It is served
by an 18" RCP whi,ch conveys storm water from the
east side of Carlsbad Boulevard to the west side
j of Carlsbad Boulevard. This pipe appears to have
been instlled when Carlsbad Boulevard was' con-
structed. The subarea is almost fully developed
with single family dwellings. The drain from this
subarea empties , onto subarea D-2 between Cerezo
'Drive and Manzano Drive. ,
D-2 This subarea contains 7.4 acres. , It is served by
,three 15" CMP outlets. The. State Park System
owns this undeveloped area. Storm water from
both D-1 and D-2 collects' in area' D-2 and flows
overland ' to the three outlets. The outlets
function as spillways. All three outlets are
close to failure because wave erosion has eroded
the bluff nearly to 'the inlet. When these
outlets fail, severe bluff erosion will occur.
Repairs are urgently needed. One outlet' pipe is
100' south and one is 250' south' of Cerezo Drive.
The last outlet, pipe' is 100' ' south of Manzano
Drive Two of the outlets are shown below
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* D-5 This subarea contains, 4 3 acres It is served by
an 18" CMP outlet pipe The pipe is fed by four
inlets along Carlsbad Boulevard This is the
last of the subareas formed by the intersection
of Carlsbad Boulevard and Palomar Airport Road
The outlet has. caused erosion because the
is pipe is broken under the old roadbed The outlet
pipe is Just csouth of the intersection of
southbound Carlsbad Boulevard with the on ramp
from Palomar Airport Road The outlet is shown
- be low
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ft D-6 This subarea co'ntains"l 3 acres, and is served by
an 18" CM.P outletpipe The pipe- is fed by two
inlets The outlet hasp caused severe erosion
because the pipe is broken approximately 5' from
the old roadbed The outlet pipe is approximately
850' -north of the Encinas Creek Bridge The * outlet is shown below
4. - -24-
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D-7 This subarea contains 9 4.acres It is served by
an 18" CMP outlet pipe The pipe- is fed by a
single inlet on the.., east side of the southbound
lanes of Carlsbad Boulevard The outlet pipe is
approximately 600 north of the Encinas Creek
Bridge The end of 4.the outlet pipe I is covered
with ice plant and is difficult to locate
D-8 This subarea contains 1 3 acres It is served by
'A n 18" CMP... outlet pipe The pipe is fed._by .,a
single inlet on 'the east side of the southbound
lanes of Carlsbad Boulevard.,The outlet pipe is
approximately. 350' north of the Encinas Creek
-8r idge The outlet 'is sIown below
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D-9 This subarea 4contains 5 acres It is a minor .-
Z ubarea on the west side of the southbound line
of Carlsbad4 Boulevard There are no stormdrain
improvements in, this area and storm water f1ows
overland
Area E
-
5 to All land in Area E adjacent the ocean is -part of the
',State..Park Area E xtends from Encinas Creek on the ,.,System
.4
north to Batiquitos Lagoon on the south This area is entirely
developed as a campground.,- -The ''4 bluff in this area is quite -
high and all access m to 'the fro the- campground is by
stairs There are several storm drains greater than 18" in
this area and also many drains smaller than 18" A storm drain '4
smaller than 18" is not effective- There has been substantial
erosion from some .-,:of the..: smaller i,,storm drains, but the larger
drains have caused little erosion
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This ar45ea has'4 little need for emergency 4 repä'irs, but the..
area should have major improvements to prevent erosion in the,
- 4 future.".,44 '',-' . :.,...
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(This area has approximately 140 8 acres and is split into
'10 subareas. •' -
4 -
E-1 This subarea Oontains-,.9 acres.' It is served by
an 18" CMP outlet pipe The pipe is currently fed
'one in1eo.'the es€'sidC of the southbound
'lanes of ;Carl'sbad"Boulev,ard. One pipe which -'
continues east from this i'ilet, 15,yt -apears to be
abandoned and not in service at this time The
outlet is bbken',off -under the old roadbed for
Carlsbad Boulevard The broken pipe has eroded
under a portion of the old roadbed and caused it
to collapse The outlet pipe is 300 north of
the noi'thérriend-;of the, parking 'lot. The outlet
is shown below.11
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E-3 This subarea contains 1.7 acres. The original
pipe was replaced with an 8" PVC pipe with 0-ring
joints during the winter of 1984. The erosion
caused by the failure of the old pipe was also
filled when the old pipe was replaced. The 8"
pipe .is fed by a single inlet. The subarea is
composed entirely of state park campground. The
outlet pipe is 5.50' south of the northern end of
the campground (Campspace 57) . The repairs are
shown below.
-29-
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E-4 This subarea contains 14 9 acre It is served
by a 241t CMP outletpipe The pipe is fed by four
inlets:The..,subarea is composed of state park
campground land, ar long section of Carlsbad
Boulevard,,andl an area of vacant land on the east
side of Carlsbad Boulevard There is evidence of
erosion 1a1ong the pipe, but it is not as severe
as the erosion along some of the smaller storm
drain pipes in this area which carry .'far less
flow Th6 outlet pipe is near the middle ofthe
mobile home park -on,-*,"the east side of Carlsbad
Boulevard (Campspace'-45) The outletis shown
below
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E-5 This subarea contains 2 7 acres It is served by
an 8" CMP outlet pipe The pipe is fed by two
inlets The subarea is composed of state park
campground and a small section of Carlsbad
Boulevard The outlet pipe has collapsed and
lower, portions of the pipe have broken away
This pipe is in need of immediate repair The
outlet pipe is 800' north of the campground
entrance (Campsite 32) The outlet pipe is shown
below
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E-8 This subarea contains 37 9 acres It is served
by a 24" outlet pipe Thissubarea is composed
of state park campground, a large section of
Carlsbad Boulevard, and ,.'a, very large section of
undeveloped land east of Carlsbad Boulevard
The
outlet pipe was recently replaced and fill placed
around it The outlet pipe is 700' south of the
campground entrance (Campspace205) The outlet '
is shown below.
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E-10 This subarea contains 69 5 acres It is served
by a 30" CM? outlet pipe This is the largest
subarea in the study It is also the only subarea
to serve land east of the railroad tracks This
subarea is composed of state park campground, a
portion of Carlsbad Bou1evard, the developed
Ponto area, undeveloped land.,north and south of
Ponto, and a 1arge portion of the trailer park
east of the railroad tracks The outlet pipe for
this subarea is undersized However, there is no.
erosion along the outlet pipe The lack of
erosion is probably attributable .to the deep grade
and slight slope of the pipe through the bluff
area
The outletpipe is just south of the n Poto under-
crossing (Campspace 168) The outlet is shown
below .
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-E-11 This subarea s contain 1 1 acres, and is no longer
served by ap1pe The or pipe failed and
has not been replaced The'storm water flows
along the campground road to the corner of the
and over the bluff maintenance,yard
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' V V
V V Chapter 3
V
V Bluff Erosion V
V
V
V
In surveying the storm drains along the coast,, it was V
possible to see virtually all stages involved in the failure of V
a storm drain. 'in the Carlsbad coastal area the failure of a
storm drain causes. imrnediateerosion. Two major erosion forces,
V
, waves and storm water,. plague the coast. The results of each
V type of erosion are easy to distinguish.' V
V When wave action erodes the - bluff, the erosion is parallel
to the coast. The waves undercut the bluffs, and large sections V
fall into the ocean. This type -of erosion creates hig'h, steep
V bluffs parallel 'to the coast line. This type - of erosion
proceeds more rapidly when sand is absent from the beach. Since
V the Carlsbad beaches have less sand each year, the wave erosion
,V V -problem is increased every year.
V Thus,' as' the amount. of sand V
has diminished, •the bluff' erosions due to wave action has
V V
V increased.
V In contrast, storm' water erosion of the bluffs, occurs
V ' perpendicular to the coast. Water running . over the bluffs
rapidly erodes wide gullies and these gullies broaden and deepen V
as they near the beach On a natural bluff very little water
flows directly over' the bluff.'. Storm water would be directed
LI . parallel to' the coast and enter the: beach area through major
drainage courses. ' As 'develOpment ,has occurred storm drains
have been installed to V collect storm water and . these drains
have generally taken the '.shortest path to' the beach, which' is
directly over the bluff's. These. storm drains have periodically V
V'V failed, substantially increasing bluff erosion.' '
Most .of the storm drains along the 'beach can be described
as follows: The slope of the drains is generally slight as the
V drain approaches' the bluff. At the bluff', a sha'rp bend is 1U
installed, with ,a very steep section' of 'pipe VdbWfl the bluff.
An outlet structure is then installed on the end of the pipe' at
the bottôm.of the bluff.' 'V V
There are a number of reasonswhy a storm drain may 'fail,
V ' but the following summarizes the general steps in ,the failure
of a storm drain.
The outlet of the storm drain is plugged, moved,
or both,, by wave action causing the joints to
leak
Storm water " escapes from the' leaky joints and V
'
rapidly erodes the steep fill around the pipe. ,
V
The erosion undermines the 'pipe, eventually
causing the pipe to collapse.'V ,
-38-
4. Storm water from the collapsed pipe erodes a wide,
deep gully where the storm drain used to be.
There are a number of preventative measures which can reduce
storm drain failures and the associated erosion. The long-term
solution is to create .'a 'master system of coastal drains which
collect all of, the existing local drains and convey the, water
parallel to the coast and into major drainage channels. A long.
term plan is developed, and estimated costs provided, for this
type of system in Chapter 5 . . . . .
If the master system . is not installed there are a number of
measures that. can be taken to' reduce the failure rate of the
existing storm drains. These preventative measures are listed
.below. . .. . .. . . . . .
1. Existing outlets .can be protected from. wave
action. ,. This can be accomplished by a number of
mechanisms, but care must be . exercised to
construct an outlet which will not be easily
blocked. Replacement of 'lost beach sand is one
method of protecting outlets. Another method is
to, locate outlets hig.her up the slope away from
wave action. However,, if the. outlet is above the
beach level a' concrete structure .or .rip-rap will
need to be placed at the outlet to prevent scour
and erosion at the outlet.
.2. Since an integral step in the failure of a storm
drain involves the joints, install storm' drain
piping with water tight joints. Most of the storm
drains installed in the past, were .corrugated
metal. Corrugated, metal pipe does not have water.
.
. tight joints. PVC piping with, water. tight 0-ring
joints would greatly. reduce joint leakage. 0-ring'
joints would most-likely remain watertight despite
slight movement 'of the outlet structure. Thus,
0-ring joints would reduce joint leakage and thus
bluff erosion. However, if PVC pipe is installed
periodic inspections will be needed to 'check for.
exposed., pipe sections. ' PVC decomposes when
exposed to sunlight. . .
3. Storm drain piping grade should be reduced and it's
.depth' increased. ' One of the major contributing
factors to the storm 'drain bluff erosion is the
steep grade of the drains. , Water flowing down a
steep slope will carry more material with it than
water. flowing down a slight slope. Thus, if the
drains were installed with a level invert through
the bluff area and the, steep slope was moved away
from the beach,., 'the erosion potential would be
reduced There is one large corrugated metal
-39-
drain installed in this manner and it appears to .
have functioned. without causing bluff erosion for
a nurñber-'- of years, while other storm drains which
appear to have been installed at the same time
, have' failed.
4. Inlets should be located to prevent water from
going over the' bluff when storm drain inlets are
plugged When new inlets are installed or old
ones replaced 'or reloc,ated they should be placed
. - to prevent water from going over the bluff when,
inlets are plugged Some of the existing inlets
are placed such that when' they plug' the water ,
goes directly over the bluff 'with little ponding.
These should be relocated such that, major' ponding
occurs so that ,maintenance crews ,ca'n be alerted
to 'the ponding and clear the drain. If 'ponding
does* not occur the drain may remain clogged for a'
long period of time, since no one would alert the
city that it was plugged
5 Storm drain systems should be analyzed to
determine what will occur 'should the outlet
become plugged All storm drain piping systems
should be designed to withstand the hydrostatic
- pressure when an outlet is plugged. A" failure
analysis should be conducted to see what will
occur when outlets are plugged When the outlet
is plugged the storm water should pond to alert , maintenance crews -that there is a problem. If
the joints will not 'hold the : hydrostatic pressure
- - - the storm water will escape through the joints,
' when .- the outlet , Is plugged 'and cause bluff ,
erosion. The inlets' should be located such that
storm water will', pond and not escape over the
bluff.
6. - In areas where it is impossible to,relocaté inlets -
to allow ponding and storm drain - blockage will
lead to water going over the bluff, surface drains'
should be considered. Surface dr-ains-.would.al'so -
Provide pathways to the beach and help to mitigate
erosion, caused by, beach users.
7 Storm drains should have a minimum size of 18"
Many of the storm drain failures, especially in
the -state- park campground, have occurred. in 'the
-' undersized drains.. Virtuallyall of. the 8" -drains
in -the campground have failed. Also,' the erosion
- ' - caused by the failure of small drains is,as severe -
- - as -that --daused by larger drains.---
-40-
Chapter 4
Needed -Repairs
Chapter 5 provides an estimate of the costs to construct a
master storm drainage system which would eliminate nearly all
of the present outlet pipes tothe.ocean. If the master storm
drainage system is constructed, many of the repairs listed in
this chapter may, not be needed and those which are needed may
be less costly if temporary repairs are made.
If the master drainage system proposed in Chapter 5 is not
adopted, then all listed repairs should be made. The repairs
should be done in accordance with the recommendations in
fl Chapter 3
'There. are a number of storm drains identified in this study
needing repair. This study. splits the drains into two cate-
gories. The first category contains drains urgently needing
:repairs, where erosion will soon undercut roadways or improved
parking lots Also included in this category are drains which
will soon fail and have the potential for substantial natural
bluff erosion. . .
The 'second category consist of drains needing repairs to
restore the drains to original condition and prevent further
erosion, but the repairs are not as urgent as 'the repairs' noted
in the first category. Included in the, second category are
drains which have undercut the old. Highway 101 roadbed in areas
'where it is used as an unimproved parking 1st,.
The repairs have also been divided into two groups by land
ownership. All drains which begin and 'end on state park land
are iis.tseparately. . S •
Urgent Repairs City of Carlsbad Drains
'B-i The northern drain in this drainage basin is
beginning' to undercut the parking lot. If repairs
are not made, areas of the lot may collapse. ' The.
CMP pipe should be replaced with PVC pipe and the
erosion refilled. The estimated cost "for repairs
is $15,000..
B'-2 The pipe 'which serves- this area has eroded the
bluff and will soon' begin to undercut the parking
lot on the end of Ocean Street The large growth
of bamboo is slowing erosion, but this drain
should' be repaired and the erosion filled. The
estimated cost for these repairs is $10,000.
-41-
,
Urgent Repairs: StateParkDr.ains ,.
D-2 The three 'drains which serve this area should be
reconstructed. The drains will soon collapse,,
leaving the bluff: unprotected. Storm -water will
cause rapid erosion on the unprotected slopes.
'The estimated cost for ,these repairs .is $50,000.
E-5 The pipe which serves' this area has failed and
will rapidly erode the, bluff. :The drain should
be replacedand the slope refilled. The estimated.
: cost for 'repair is $37,500.
Other Needed Repairs
...There are , a '1arge number of 'drains which' need to be,
repaired. Most of' the drains need to be refilled and new pipe
installed. Table'4-l" lists. the 'drains and needed repairs. The
table lists City. of Carlsbad' brains separately from State Park
area Drains. Most of the money 'needed to fix these drains
could be better spent on the needed master facilities'. The cost
presented are 'to restore the drains to their original condition.
.The drains shouldbe expected to fail again,, since the original
installation has failed.
Many' of the drains' in the state park campground are under-
..sized and should be replaced.. " However, the need for "each of
these repairs should be judged independently, remembering that
the master facilities recommended' in the next chapter would
eliminate the ,need for these repairs.
-42-
' ' .'. •
•.• ' '. '
-
-
••
TABLE 4-1
NEEDED REPAIRSJO EXISTING DRAINS a
CITY OF CARLSBAD DRAINS
Drain Description of Rpairs
-• Cost
D-5 Replace pipe, refill and rock outlet
$ 37,500 Replace pipe, refill and rock outlet
37,500 • B-9g Refill pipe, rock outlet'
S 15,000 D-6 Replace pipe, refill and rock outlet
37,500 E-4 Refill pipe, rock outlet • •'
• 22,500 B-7 Replace pipe with 18", refill and rock arou
n
d
'outlet. • 37,500 B-9a Refill pipe, rock outlet
15,000 B-9b. Refill pipe, rock &itIet
•• 15,000 LI B-9c • Rép.ace pipe, refill :ad rock 'outlet
••• 37,500 B-9d Refill pipe, rock outlet • 15,000 D-3 Locate pipe and repair
37,500 0-4 Replacepipe, refill and rock outlet
.5 37,500 -- 0-7 Replace pipe, refill and rock outlet
- • 22,500 . 0-8 : Replace pipe, refill and rock oUtlet I
• 15,000 fl B-9f Refill and rock aroundoutlet
• • 12,000 C-i Refill both pipes
7,500 B-5 RefilLand rock around outlet
• •• • 7,500 -•
4 B-96 Refill and rock around outlet • . . 7,500
Subtotal $417,000
III
-43-
S
-- • --
tllb
TABLE 4,1
NEEDED REPAIRS TO. EXISTING DPINS a (continued)
STATE PARK DRAINS
1•
fl
Drain Description of Repairs 0
E-6 Replace pipe with 18", refill and rock outlet
E-9 Remove debris, refill, improve road drain
E-ll Remove debris, refill, imprOve road drain
E2b Replace pipe with 18", refill and rock outlet
1 E.3b Replace pipe with 18", refill and rock outlet
E_7b Replace pipe with 18", refill and rock outlet
0 • : • Subtotal
TOTAL
a Drains are listed with those needing repairs the
most first. • - •
b These drains have recently been repaired. They
are listed as needing repairs because the new
• pipe is 8I and the minimum storm drain size should be 18t1.
-
0
0
44
Cost
$37,500
30,000
22,500
37,500
37,500
37,500
$202,500
$619,500
_Chapter 5
Master Facilities
Figures 5-1 through 5-4 show the Master Facilities needed
to collect storm water and convey it parallel to the coast and
reduce the bluff erosion cause d by stormwater. Each area will'
be discussed below and improvements recommended. Table 5-1
summarizes the recommended improvements A description of each
pipe reach as well as cost..information may be found to this
table
1 Area A.
The existing drains in this area are adequate and no new
facilities are plannedt for this area The area is fully
developed and the existing drains, upon failure, would cause
more damage to improvements in the area than to the bluff. The
only improvements needed to this area are curb and gutter to
eliminate the nuisance puddles
Area B - Whale Watch Area
A storm drain should be constructed in Carlsbad Boulevard,
beginning at Pine Avenue and continue south to Agua Hedionda
M The drain will vary in size from 2411 to 48". The approximate
length of the needed improvements is 4,290' The estimated
cost for these improvements is $572,000 Table 5-1 summarizes
the needed improvements
We looked at the alternative of installing two pipelines to
serve this area.. One would start at Sycamore and flow north,
the other would start at Maple and flow south This alternative
was slightly more expensive, but it should be reevaluated during
final design if master facilities are constructed in this area
The proposed facilities are quite deep and the alternate of two
drains eliminates some of the deep sections of storm drain
The westerly curb of Carlsbad Boulevard should also be
raised to prevent storm water from going over the curb Also,
drainage patterns in the Whale Watch area should be reviewed to
make sure the storm water does not go Iover the bluff. It
appears that curb :breaks for handicapped persons may have
re-routed some of the storm water flows
Area C - Terra Mar Area
A. storm drain-is needed as the majority of the storm water
will come from the developed area east of Carlsbad Boulevard
The drain should begin in Area D just south of Cerezo Drive and
continue north to Agua Hedionda The developed area west of
Carlsbad Boulevard would not be served by this new storm drain
This area would continue to be served by the existing drains
-45-
Contributory
Subareas .
Location & Description
of Improvements
Total Acres
Served
Approximate,
Flow Line
Depth (feet)
Costs
(Thousands
of Dollars) a
Whale Watch Area
(Flows South)
B-i Ocean St. North of Pine Ave. 6.0 8 15 230' of 24"
B-i- B-2 Carlsbad Blvd., Pine Ave.. to '10.7 13 46 Walnut Ave.
540' of 30"
B-i thru B-3 Carlsbad Blvd , Walnut Ave 14.0 17 23 to Sycamore Ave.
220' of 36"
B-i thru B-4 Carlsbad Blvd., Sycoré Ave. 17.4 19 66 to Maple Ave.'
' 630' of 36',' '
S
'B-i thru B-5 Carlsbad Blvd., Maple Ave. 25.3 21 , 71 to 140' So. of Acacia Ave.
470' of 42"
B thru B-6 Carlsbad Blvd., 140' So of 31.1 .. 24 94 Acacia Ave to Juniper Ave
550' of 48"
B-i thru B-7 Carlsbad Blvd., Juniper -Ave. 36.1 22 145 to Tamarack Ave.
850' of 48"
B-1 thru 8-9
- Carlsbad Blvd., Tamarack Ave. ' 49.9 ' 10 112 '
- , to Agua Hedionda Lagoon
800' of 48"
' S
Contributory
Subareas
Location & Description
of Improvements
Total Acres
Served
Approximate
Flow Line
Depth (feet)
Costs
(Thousands a of Dollars)
Terra Mar Area
(Flows North)
D-1, D-2 Carlsbad Blvd , 470' So of 20.3 9 226
Cerezo Dr. to Cannon Road V
V
V
2,150' of 42"
D-1, D-2 Carlsbad Blvd , Cannon Rd 35.2 9 225
and C-2 to 650' No of Power Plant
Outlet. V :
V 'V V
1,800 of 48"
D-1, D-2 Carlsbad Blvd., 650' No of 37.3 5 44
C-2 & C-1 V
Power Plant Outlet toAgua
Hedionda Lagoon
3501 of 48"
Subtotal 495
Palomar Airport
Rd to Encinas
Creek (Flows
South)
D-3 Southbound Carlsbad Blvd .1 .3 9 19 900' South of Manzano Dr
to just North of paved
loop adjacent to South-
bound lanes of Carlsbad Blvd
350' of 18"
D-3 & D-4 Southbound Carlsbad Blvd 2 0 11 30 just North of paved loop V V V
to end of Palanar Airport
Road onrip
500' of 18"
D-3 thru D-5 Southbound Carlsbad Blvd .6 .3 13 52 end of Palanar Airport Rd
oriramp to 800 South of
orramp.
V 800' of 24"
-47-
TABLE 5-1
SUMMARY OF COST FOR MASTER DRAINAGE sysrn,i (continued)
- Approximate Costs Contributory Location & Description Total Acres Flow Line (Thousands Subareas of. Inrovnts ;. - Served Depth (feet) of Dollars) a
4 Palanar Airport
Rd. to Encinas
• Creek (Flows
. . South) (con't) . . . . .
D-3 thru D6 Southbound Carlsbad Blvd.. 7.6 12 30 800' South of. onrauip to . 1,160' North of Encinas
Creek Bridge : • 430' of 27"
D-3 thru D-7 Southbound Carlbad blvd. 8.5 7 33 • 1,160' North of Encinas
Creek Bridge to 650'
North of Bridge.
510' of 27" • • .
D-3 thru D-9 Southbound Carlsbad Blvd. 10.3 5 42
• 650' North of Encinas
Creek Bridge to Bridge.. .
• 650' of 27" . •
Subtotal • • 206
.1. I.-- I. •1 -
44
. . •-.
.
S.
- TABLE:.5-1
SUMMARY OF COr FOR MASTER DRAINAGE ssri (continued) -
Approximate Costs Contributory Location & Description Total Acres Flow Line (Thousands Subareas of Improvnts .: Served Depth (feet) of Dollars). ¶
. S • . S Northern Part
of State Park Campground
(Flows North) -.
E.-4, E-5 . So.ithboundCarlsbad.Bliid 17.6. . 14 . .62
.5 - Campspace.45 to
Campspace 57 .: 650' of 3V
E-3 thru E-5 Southbound Carlsbad Blvd 19 3 19 97 . . . -Camjspace 57 to
Campspace7O
720' of 42" S 5_. .. . 4 .4.. . . . E-2. thru E-5 .. Southbound Carlsbad Blvd. 21.9 •. . - 13 . 72 • Campspace-70 to 1,100feet . . -. . . .•. . North of Encinas Creek
Bridge
600' of 42" -.. . . .,. . .
E-1 thru E76 Southbound Carlsbad Blvd..22.8 5 74 1,100 feet North of Encinas .• . . '. ---. ..... . . Creek Bridge400feet: -to . -. .. . North of Bridge . . .. S. . .. .700 ' of 42" : . •
'.
.. .
Subtotal - 349
Southern Part '
of State Park — Campground a - (Flows South).
E-6 Southbound Carlsbad Blvd ! - 5 55 Campspace 12 to the - - - .- - e4._it.s'5 * * Campfire Center
1,000' of 18"
S.
- - -
IX
-, - . . •, - S.*S.5fr5. - - -
i.A\x .WALL1EIS ,
IN
,
TABLE 5-1
SUMMARY OF COST FOR MASTER DRAINAGE SYSTaI (continued)
... Approximate Costs Contributory . Location & Description rotal Acres Flow Line (Thousands
Subareas of Improvements H Served Depth (feet) a of Dollars)
Southern Part
of State Park
Campground .
(Flows South)
E-6, E-7 Southbound Carlsbad Blvd. 7.8 . 8 62
Campfire center to
Campspace 205
950' of 27"
E-6 thru E-8 Southbound Carlsbad Blvd. 45.7 15 207
Campspace 205 to
- Campspace 183 . . .
1,150 of 54"
E-6 thru E-9 Southbound Carlsbad Blvd. 47.4 19 135-
çanpspace 183 to .
Campspace 168
750' of 54" :
E-6 thru E-10 Southbound Carlsbad Blvd.,116.9 16 216
Campspace 168 to
-Southern end of Campground
maintenance. yard
900' of 72"
E-6 thru E-ll Southbound Car1sbadBl,d. 118.0 9 240
Southern end of Campground. .
maintenance yard to Batiqul-
tos Lagoon Bridge
1,200' of 72" . . . . . .
.
915 Subtotal
TOTAL 21 537
a Costs include engineering
-50-
The new drain will vary in size from 42" to 48" The
approximate length of the needed improvements 'is 4,300' and -the
estimated cost is $495,000.. Table 5-1 summarizes the needed -
improvements.
AreaD - Palomar Airport Road to'Encinas Creek
The drainage basins in this area are defined by the roads
Since the roads in this area may.,be changed: as the, area is;
developed a's a state park, future drainage improvements should
be integrated with the state park improvements.
The future drain will, have to begin near the Palomar
Airport Road -'Carlsbad Boulevard intersection. The drain will
then continue south to the Encinas Creek Bridge The new drain
will vary in size from 18" to 27". The approximate length of
the needed improvements is 3,240' and the estimated •cost -is
$206,000. Table'S-i summarizes the needed, improvements.
Area'E - State, Park Campground
There are two future drains which are needed to,serve this
area. Both drains begin between the trailer. 'park and the
'developed Ponto Area. ' One of the drains flows north to the
Encinas Creek Bridge and the other flows south to' Batiquitos
Lagoon
The northern drain varies 'in size from 18". to 42". The
approximate length of the needed'improvements is 3,470' and the
estimated cost is $349,000. '
The southern drain varies in size from 18" to 72" The
approximate length of the needed improvements is 5,950' and the
estimated cost is $915,000. •• ' ' '' ' '
Table 5-1 summarizes the needed improvements for both
drains.
'-51-
I
:
:
-I
- 72OOF42
oo or 42
SEE.FIGURE 5-3
ART OF
'GROUND AREA.
I) -
ILSON ENGINEERING
FIGURE 5-2
/
'.__80 . 18••
-650 OF 36
FOR CONTINUATION SEE FIGURE 5-2
NORTHERN PART OF
STATE PARK CAMPGROUND AREA
FLOW-
(NORTH)
4.
p
iiiiiiiiij
1000' OF IS'
FOR CONTINUATION SEE FIGURE 5-4
SOUTHERN PART OF
STATE PARK CAMPGROUND AREA
FLOw-Ø (SOUTH)
MASTER STORMDRAIN FACILITIES
WILSON ENGINEERING
FIGURE 5-3
______
I
•et
I
low
RIM
Ir