HomeMy WebLinkAboutJETTY PUD AT THE LANDINGS - Filed GC-GENERAL CORRESPONDENCE - 2004-08-12CORNLII CONSUIIIN(i COMI)ANy POIKev(rlh I,Ne�ollivti,nd�xauk�7N1'�Il Ida (iUS�d81-6(i(l�
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December 13, 1979
Mr. Curt. Smith
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Re: Preliminary Drainage Report for The Ridge at The Landings
. _ ......... .
Dear Curt:
The purpose of this letter is to present the preliminary drainage
plan for The Ridge at The Landings for your approval.
The Ridge is a triangularly -shaped site that falls from a high ridge
near the center toward the north and south. The drainage scheme is
to collect storm water usinq swales located near the upstream edge
of Larimer Canal No. 2 in conjunction with a storm sewer to concen-
trate the flow near the eastern boundary.
The total major storm flow at this point measures 30 cfs. It will
discharge under Larimer County Canal No. 2 by a 30-inch diameter
reinforced concrete pipe. An open ditch will then carry the runoff
through Landings IV to Harmony Reservoir. Detention requirements
for the site will be transferred to Harmony Reservoir. The reservoir
can accept this detention volume without flooding neighboring
residences provided the normal operating elevation is set correctly.
Because of topographic restrictions, 6 to 7 dwelling units will not
drain into Harmony Reservoir but will empty directly into Larimer
County Canal No. 2. Approximately 80 percent of the total area will
drain to Harmony Reservoir.
The conceptual drainage plan utilizes the natural topography as much
as possible in providing a low cost, workable method for draining
storm water. A more detailed design will be provided for final sub-
mittal of the project. If you have any questions, please feel free
to contact our office.
Sincerely,
CORNELL CO SULTING COMPANY
Rick�R. Pickard
Engineer
Bill Blackwell
Senior Design Engineer
RRP:BB/fsr
cc: Mr. Mauri Rupel, City Engineering Department
Mr. Frank Vaught, ZVFK Architects
Fehruary 11, 1980
Mr. Bob Smith
Storm Drainage Engineer
City c Fort ColIiis
P.O. Pox 58G
Fort Ql lins, Colorado 80;2L
Dear Bib:
This I:,Lter is intended to address the drainage of Landings IV replat
as q"hiitled ii F-hruary 19, 1D80. T'ne changes d-_pitted on the replat
are ❑ i �or bo.,ndary al i gments and redesign of internal cull -de -sacs.
A Masn r Herr Draina,,e Report for the Landings PUD was done by this
office in early 1979. This report encompassed the Landings IV PUD
which Lscribad L`= method, by ahic`i storn drai rage would be accoi iodated.
Basically, vorn ,�no'f uo ld n collacted and flow overland, as well
as in=over_d pipe. to Har-finny Res_r✓oir Man wit ,erve as a datention
basin of a ! I of the Iapdi'os. Sheet 1 of 1, which is attached,
presv.=.ts the drainage hask s and the nears by which each will entity
into Ji rmony Reservoir.
The changes shown on Landi qs IV replat do not altar the drainage design
as comile-ted irn,j0U. hasks will remain unchanged and not
aII- r he sub -bask `lows. Storm runoff from the Jetty PUD whit; is
up -basin Iram Landings IV is accommodated by a 36-inch diameter RCP
and nns alon; Low ed:,;,. or landings IV replat. This is in accordance
with tie Mast-r Draiiagv Piar and .will not adversely affect the
Landings IV replat.
We. subs& I this information for your comments or questions. Please feel
free to call should you have any,
Sincerely,
CORNEL'_ CONSULTING COMPANY
r
Rol:„rt I Lenz /
Design ngineer �_l'
RLUfsr
Enclosare
CI IY 01 1 OR I (OI [INS
ENGINLL RING DIVISION
February 26, 1_980
1'.O- IiOX ?80, I'OR I ( 0I.1 INS, COI ORADO SO522 I'll (303) 3S4 4 1 )0
LXT. 728
Plr, Robert L. Lenz
Cornell Consulting ComFxany
P.O. Box 646
Fort Collins, Colorado
an
I have reviewed your correspondence of February 19, 1980 regarding
the revised pLattinq of Landings IV and have the following question.
The Tandinqs P.U.D. roaster Drainage Plan shows a larger area that
will contribute to Harmony Reservoir. The area in question is
area 3 of the report, as COmppared to the Jetty. Will these flows
be directed toward another area?
Also, the flows shown in your correspondence do not corrvare with
those in The Landings P.U.D. Master Drainage Plan.
As soon as possible I would like to meet with you regarding the above.
Sincerely,
r
Bob Smith
Assistant City Engineer - Drainage
cc: rlauri R(roel
(.ORNfII (ii%NlUifl'"J(t '.r.0 �, i:F(JI)
M
N\NM �I NI ♦ I 1 '(11%, 1 Ia%h
February 29, 190
Mr. 3nb Smith
Assistant City Engineer - Draina_oe
City of Fort Collins
P.O. Sox 930
Fort :ollins, Colorado 20522
Dear ;3ou:
I wis'i to address the concerns you raised in a letter to 3nb Lenz of
this A ic_e. dated February 26, 1900. The thrust of 3ob's letter,
coverin� Landings I/ renlv!, was that the replat did not cnan_ce the
previ)u,ly approved draina-e pattern. Sheet I of I submitted with that
letter of the 11th was prepared as an appendix for the Jetty drainage
report. We apolo"ix_e for the confusion the carlf release of this appendix
apparently caused.
You were concerned over the discr,pency between tie Armory basin shown
in t'n, "taster Plan; and shna t 1 of 1. The :"faster Plan was an analysis
of colplenly developed basin and considered flow paths possible only
with drainage ioprovemenLs. The Jetty r,ort SInWS the drainage has iI for
Narmoiy Reservior to the current stag of clan min, At pressnt othsr
ups'r -a lands, harts of =gees 2 and 3, do not dl,char_, Kto Harmony.
The difference in basin size you noted is due, than, to the development
status of basin. The Master Plan shows one alternate for ulti,mate
&v 1 vprlent. darn-ony Re,rvior Drainane Basin l I°` sheet 1 of 1, slows
t 'h- 634in at its current In qi:n,- ,ta"r We aisn wish to point o.rt that
the eltlmato draina�.e ;at 1 _.rr for this area rests more on economic trade-
offs .)o1weeu the Ave lovers than it does on our master drainage plan.
You also mentioned the comparison of the flows in the Master Plan 00
those r,, th,, ianuony 'lcs rvior shoot. The Master Plan ,.sea Airpitch
ti n con/ehtration and a C,iIST of 0.30, where the no re recent plan use
the Overland Flow tine of concentration and a CHIST of 0,20.
If this letter, along with the Jetty Drainalu Report, does not clarify the
situation please contact me by phone and I will met with you.
Sincerely,
CORA, L CONSULTING COMPAAY
3i l l 3lackwel l
Senior Denim Engineer