HomeMy WebLinkAbout1975-12-16; City Council; 3546; Bristol Cove Siltation ProblemCITY OF CARLSBAD
AGENDA-BILL NO. _5^'-V^ '. 'initial:
• Dept.Hd.
DEPARTMENT; Public Works _ • _ _ . C. Mgr.
Subject:
BRISTOL COVE SILTATION PROBLEM
Statement of the Matter
.x
.The Bristol Cove Property Owner's Association has requested that a
study be made into the possibility of relieving a silting problem
in their channel at Bristol Cove. The attached report gives a
brief background of the problem and discusses the proposal of the
property owners.
Exhibits.
1. letter from Bristol .Cove Property Owner's Association dated
November 4', 1975 '
2. staff report
Recommendation
If Council wishes to aid the property owners in determining the proper
solution to their problem, it should be understood that the City
accepts no liability for the present situation, and that our partici-
- pation is only in an attempt to assist in determining solutions to
an apparent neighborhood problem.
As an alternative to studying this matter in staff, the Council may
wish to retain an outside consultant. Funds for such a study could
be budgeted in next year's budget, or if the Council wished to
proceed immediately, they could be made available through Federal
Revenue Sharing Fund Reserve's.
If the Council wishes to have' the City conduct the requested study,
directions should be given to staff to proceed.
Council action - - .
12-16-75 The staff recommendation was accepted for staff to proceed
with a study to aid the property owners in determining the
proper solution to the problem, with the stipulation that
it is understood that the City accept no liability for the
presents ituat ion.
BRISTOL COVE PROPE HERS' ASSOCIATION
November 14, 1975
City Council
City of Carlsbad
Carlsbad, Calif.
Dear Council Members»
As you know we have a bad silting problem in our channel at Bristol
Cove. It has become increasingly difficult as the areas above us
have been developed; what with roofs, streets, driveways, etc. causing
a much greater flow into pipes emptying out onto bare ground. This
has resulted in huge chasms being washed out and down on us filling
the whole Horth end of the channel. Last year it cost $13,000 to
remove it. Even this amount is a pittance compared to what it will
be as Bristol Cove develops and we have no way to get the machinery
in and no place to put the silt as it is taken out.
In^recent meeting with the City Manager, the Director of Public Works,
the Director of Parks and Recreation, Mr. Roche from Janss Corporation,
a nd members of Bristol Cove Property Owners Association Board of
Directors, it was suggested that a study be made of the possibilities
of improving the situation. I am hereby requesting $hat this matter
be taken up in Council as soon as possible.
Respectfully yours,
Barton ffeislink
President
BWL/df
1975
BRISTOL COVE 4585 COVE DRIVE CARLSBAD, CALIFORNIA 92OO8 (714) 729-5222
MEMORANDUM
November 24, 1975
TO: City Manager
FROM: Public Works Administrator
SUBJECT: Bristol Cove Siltation Problem
The Bristol Cove Property Owners' Association has requested that
the City investigate the sources of a silting problem they have
at the north end of the Cove and recommend a solution to the
problem. Channel siltation has required the property owners to
dredge the channel a number of times during the last several years.
This should not be unexpected since the lagoon is a natural drain-
age basin for a number of natural drainage areas and Bristol Cove
was apparently developed without full consideration to the problems
associated with this drainage.
A previous private engineering report, paid for by the Bristol Cove
Property Owners' Association, recommended the construction of desilting
basins along the upstream channel. The homeowners' association
apparently didn't concur in this approach and no remedial work was
done.
There are several tributaries to this storm drain channel, the largest
of which carries drainage from the Tamarack East development. Recent
construction of this unit of the subdivision included installation of
storm drains and paving. This, in conjunction with lot development,
should remove what appeared to be a major source of siltation. The
remaining tributaries, Hillside Drive, James Drive extension and a
paved channel east of Park Drive, join the main flow in an open ditch
southerly of the end of the Tamarack East storm drain. It is in this
section that most of the erosion has occurred which, combined with the
other now-controlled source, resulted in much of the siltation in the
Cove.
The proposal by the Bristol Cove Property Owners' Association is to
have the Engineering Department staff study the advisability of installing
a permanent storm drain system and its effect on eliminating the siltation
problem. The permanent system would include approximately 1050 feet of
60" diameter line from Adams to Hillside (the major erosion area) and
approximately 1500 feet of a smaller line extending up the extension of
James Drive from Hillside to the existing end of street (an area of no
significant recent erosion).
A rough estimate of the staff time required to design the project is
240 manhours for the Adams-Hillside section and an additional 200 man-
hours for the Hillside-James Drive section.
A feasibility study, such as requested by the property owners, would
take about 40 manhours and should result in a recommendation as to the
effectiveness of the storm drain extension in resolving the problem.
City Manager
November 24, 1975
Page Two
Council, if it considers the request and directs staff to conduct
the study, should also indicate its relative priority in relation-
ship to other staff work currently undertaken.
Ronald A. Beckman
RAB/dh