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HomeMy WebLinkAboutDrainage Reports - 02/16/19871 1 1 1 1 1 FINAL DRAINAGE INVESTIGATION FOR SUNSTONE VILLAGE - 1ST SUBDIVISION (A PLANNED UNIT DEVELOPMENT) FORT COLLINS, COLORADO Prepared For: D.E. Burns Construction Company & The Group Realtors 375 E. Horsetooth Road Ft. Collins, Colorado 80521 Date: February 16, 1987 Project No. 3721-EC4F-01-567 CONSULTING ENGINEERS LANDMARK ENGINEERING LTD. 2300 West Eisenhower Boulevard Loveland, Colorado 80537 Ph: (303) 667-6286 1 (5 i LandmarN ENGINEERING LTD. 0 ' February 18, 1987 Project No. 3721-EC4F-01-567 D. E. Burns Construction Co., Inc. ' & The Group Realtors 375 E. Horsetooth Road Ft. Collins, Colorado 80521 1 RE: Final Drainage Investigation for Proposed "Sunstone Village - P.U.D." Ft. Collins, Colorado Gentlemen: As requested, this office has performed a final drainage investigation for the proposed "Sunstone Village - P.U.D.", 1st Subdivision, Ft. Collins, Colorado. The existing and proposed conditions have been analyzed based upon site observations, topographic mapping, previous reports and the proposed site improvement plans. Also included in this report is the justification for and projected cost of downstream improvements that will not be constructed due to improvements being included with this project. This information is included in this report as the basis for reimbursements due the Developer of Sunstone Village. Please reference the letter and calculations, Addendum A, attached hereto. Main Office ' 2300 West Eisenhower Blvd. Loveland, Colorado 80537 -Branch Office 2235 2nd Avenue Dale D. Olhousen, P.E. & L.S. Greeley, Colorado 80631 ' ENGINEERS / ARCHITECTS / PLANNERS / SURVEYORS d Loveland (303) 667-6286 • Greeley (303) 356-6286 • Fort Collins (303) 221 5550 9 Denver (303) 629-7124 I 1 1 11 1 D.E. Burns Construction Co., Inc. & The Group Realtors Project No. 3721-EC4F-01-567 February 16, 1987 Page 2 Enclosed you will find the results of this investigation. If you should have any questions or desire additional information, please feel free to contact this office. Sincerely, LAND RK ENGINEERING LTD. Dennis R. Messner DRM/er Enclosure I hereby affirm that this report and plan for the final drainage design of "Sunstone Village - P.U.D.", 1st Subdivision, was prepared by me or under my direct supervision, for the owners thereof. `Dale D. Olhausen Colorado P.E. 5007 1 1 1 1 TABLE OF CONTENTS Letter of Transmittal Table of Contents General Design Criteria Storm Run-off Analysis Conclusions and Recommendations Exhibits Design Calculations Addendum A - Downstream improvements & Reimbursement Costs i ii 1 3 4 6 fJ [J 1 The "Sunstone Village - PUD", 1st Subdivision, is a portion of a proposed mixed usage development with the major portion of the site to be developed into single family residential lots. The site is located in the Northwest Quarter of Section 32, Township 7 North, Range 68 West of the 6th Principal Meridian, Larimer County, Colorado. More general- ly, the site is situated along the Eastern side of Timberline Road approximately 1/4 to 1/2 mile south of Horsetooth Road. The 1st Subdivision consits of an area of 27.6 +/- acres. The site is proposed to be developed into 43 single family residential lots, a 6.5 acre public open space/detention facility, a 1.3 acre drainage way, and a 7.4 acre potential school site. The timetable for development of the site is anticipated to occur over the next two to three years. The site is accessed on the West from Timberline Road. An undeveloped area and the Harmony Village Mobile Home Park abut the site to the South. Irrigated row crop farmland adjoins the site on the East. The Fox Meadows Subdivision abuts the site on the North. The topography generally slopes from West to East at relatively flat slopes, from 0.5% to 1%. The site has been farmed recently. The site has a relatively high ground water table which is anticipat- ed to have seasonal fluctuation due to the continuing agri- cultural irrigation in the vicinity. No major drainage courses presently exist on the site. Runoff from the area to the South appears to be routed around the site to the East and through an existing detention facility in Harmony Village Mobile Home Park. The Fox Meadows Subdivision contributes minor rear lot drainage which presently drains onto the site, but the vast majority of the subdivisions runoff is directed to the North and East within Fox Meadows. The land to the East drains Easterly away from the subdivi- sion. The land to the West of Timberline Road drains to Timberline and presently is directed via a buried irrigation pipeline along the Northern boundary of the site to the Northeast corner where an overflow and discharge structure is located which directs drainage into a 30" diameter storm drain that flows Northerly along the Eastern boundary of Fox Meadows. The site is located within the Fox Meadows Basin as designated on the City of Fort Collins Master Drainage Plan. The Fox Meadows Basin Master Plan reflects that a major drainage channel be constructed along the Northern boundary of the site and that a regional detention storage facility be provided in this vicinity. These two drainage improvements have been incorporated into the improvements 1 ' for the initial phase of development. A 40 foot wide strip of property is being provided to allow for the construction ' of the major drainage channel. A low flow trickle channel is to be constructed in conjunction with the open channel at initial development. A 6.5 acre parcel located in the Northeast corner of the site is to be used for the regional ' detention storage facility and public park site. The design flews for the open channel drainageway are 43 cfs and 64 cfs for the 2 Year and 100 Year Storm flows respectively. The ' storage volume to be provided in the regional detention facility is 28.74 Ac-ft. with a maximum discharge rate of 24 cfs. n 1 1 2 ' DESIGN CRITERIA In order to determine the rate and volume of runoff, both ' under the existing conditions and the proposed developed conditions, an acknowledged method of calculation has been used. The design method used was the "Rational Method" as outlined in the "City of Fort Collins Storm Drainage Design ' Criteria and Construction Standards" manual. This method enables the designer to determine the rate of runoff to be anticipated. The "Rational Method" is based on the formula ' Q = CIACf explained as follows: Q = the rate of runoff, in cubic feet per second ' (cfs) . C = runoff coefficient, which is the ratio between the maximum rate of runoff from the area and the ' average rate of rainfall intensity, in inches per hour, for the period of maximum rainfall of a given frequency of occurrence having a duration ' equal to the time of concentration. I = average intensity of rainfall, in inches per hour, ' for a duration equal to time of concentration. A = area, in acres. ' C = frequency factor to account for antecedent precip- f itation conditions, dimensionless. ' The Time of Concentration is that time required for runoff to flow from the most remote point.of the drainage basin to the point of concentration being considered. The Time of ' Concentration is the total of the overland flow time and flow time within channel, if any. ' The equation used to determine the overland flow is: Tc = 1.87 (1.1 - C C f ) D1/2/S1/3 where: Tc = Time of concentration, in minutes. S = Slope of basin, in percent. D = Length of basin, in feet. C Cf = Run-off coefficient and frequency factor, as used in the "Rational Method" formula. 11 ' 3 [J 1 11 1 [J C L [I 1 The in -channel flow time is based on the flow velocity, and is dependent on the configuration of the channel and magni- tude of flow. The volume of each storm evaluated has been based on the "Rational Method Hydrograph". The volume is based on the following formula: Vol. = Q x Tc x 60 Vol. = Volume of runoff, in cubic feet (cu. ft.) Q = Rate of runoff, in cubic feet per second (cfs) Tc = Time of concentration, in minutes Storm Runoff Analysis The analysis for the site has considered the existing and proposed conditions. The design storm return periods con- sidered are the "Initial Design Storm", 2 Year, and "Major Design Storm", 100 Year. Existing Conditions The runoff from the total 74.4 acre site has been estimated to be 10.4 cfs for the 2 Year Storm Frequency and 35.3 cfs for the 100 Year Storm Frequency. Proposed Develooed Condition The runoff from the total 74.4 acre site has been estimated to be 61.4 cfs for the 2 Year Storm Frequency and 214.8 cfs for the 100 Year Storm Frequency. The minimum detention storage volume to be provided for the site only is estimated to be 10.82 Ac-ft. with a release rate of 10.4 cfs. The Volume designed to be provided is 29 acre-feet, more or less, with a maximum release rate of 24 cfs. Negotiations are in process to determine the disposition of the existing buried irrigation line located along the North- ern boundary of the site. That is, is the line active and necessary to serve farms in the area or can it be used for low flow routing of runoff water. The capacity end value of the existing facilities is to be negotiated in order for the City to determine whether it is beneficial to purchase the existing facilities or construct new improvements. These negotiations are to be finalized prior to the development of the second phase of this project. 1 4 ' The proposed plan is intended to retain the existing drain- age pattern with runoff on the site being routed internally from West to East. All of the runoff from the site will be ' directed into the proposed detention facility to be located at the Northeast corner. The construction of the detention facility is to be performed in conjunction with the initial ' development phase. The drainageway channel along the North- ern boundary is to be constructed with the initial phase. The determination of the location and size of storm drainage pipes, inlets and associated facilities has been determined ' as a part of the subdivision improvement design process. All facilities are designed to meet the City of Fort Collins criteria and specifications. The initial development of the ' project has been designed to construct facilities of ade- quate size to handle all future development on the upstream area of the site. 1 1 1] 5 CONCLUSIONS AND RECOMMENDATIONS ' 1. The existing drainage pattern for the site is to be generally retained. ' 2. The proposed run-off volume due to the proposed devel- opment of the site has been considered. On -site deten- tion is proposed for the development in conjunction ' with a regional facility. 3. Drainage structures, that is, catch basin, pipe, and overland channels are designed as a part of the final subdivision improvement plans to be filed with the City of Fort Collins Engineering Department. ' 4. Overlot grading is to be performed in accordance with the site grading and drainage plan. t 5. All proposed structures and streets' flow capacities have been investigated and have been found to meet or exceed the criteria set forth in the "City of Fort Collins Storm Dranage Design Criteria and Construction ' Manual." The site is not located within a designated "Flood - Plain". 7. The City shall reimburse the Sunstone Village P.U.D. developer per the attached Addendum A and Exhibit B. 1 1 1 1 6 d12 lv,'F \ r h 1..:.. 1 ZA I 1 i I L �eL.,, elk >1 n r ^ 12- .01a T T o T AK t., �-d L)% \ L � yv\ l+ � No Text 7-- 6 T rl-OQ . — q'S kc. I-�-u off Z ; A2 r n s � - � - STORM DRAINAGE SYSTEM PRELIMINARY DESIGN DATA Location Fiow Time c Street Pape Street Pipe O � N of E Design Point -c o _ • • • o _ a c_ u —,_ o .- , - >. I C Remarks m J c E v� E E U U E c ° o i v o a .. u' 1 cpb ' a r- E c -_ — - Q C°— O c., O a: c.r cn 2 N a Q a~ U uI V) i7 .0 U c.� O c.r >•� 2 3 4 5 6 7 8 9 0 II 12 13 14 IS to I' 13 13 20 t 21 22 ' 23 �-7 �- 17 '#1 •t 1/ram/�� 0 - y t EA�°� C O F 57) �� r 11 TP 2•tw w i' •i , 1 n y �f LC5-''WM Form II-3 I 1 i 1 1 1 1 1 1 1 _—LLI -fir. - - N SITE - STORM DRAINAGE SYSTEM PRELIMINARY DESIGN DATA Flow Time i Location a Street Pi Pa Sfreet Pipa of a m cuDesi 9 n PointIZE • �_U a c —�- o9ooaic ° o - - Remarks E er E ►-v°E c= Q? _ c ���= > > ti aN w ,. o c°i - O a: U O S c� V) 0 _a�o�I _° �I I .c _ °+ v U s o U a 2 > • a o 2 3 a 5 8 9 Iq tl 12 13 i a 15 IS I t a u > r' 13 1'3 2C 2! 22 t 23 br,rL i �^. • i- -ILL] 0 1 , I •Cc� G /J , T,7 le LCS-W,m Form II 3. 3 1 10 46 le- fti e-,kic rA4,,),me- r6 cob we- Z L Is >? :�yi2 (O,d�d� f s,�(o, 030��/ = d, 0�3. 2 9 (, �s� �D, S� s� 3 40, (O,DoY) OAJ3 As NhN t )3 7,1S c/erz./ 'ZI 17,7S , 3 N f .436 Az66 0) 7, I. 33 C-u 2.6 27 Z "71 A.:, u Sij „, T (iN P. 77 i?cC ep = /, #n, 4� D�o�3 o-t' s10-0�4 G6j.rH,1 i) o e� f S�i' % CScua �2� 78, CJ c 4sS nn , �l �v A.- Vv IU e. Cam. ,F+-, Z� O 2$ 35,yo� Z74 Z50 ��- ey �-D Z9.75 tL @ u1Qs,�- S.dc et- Ca,^� �Odv� �r'-• 137z1 -Ec-yF-or-4ic,71 'D> ?-rn @ S� 6�-Gs X-5 e-640v-,. = 72 S.r• eS S�• Zino x—See+,vh = 5z SF. UU S }00 X � 3�S �dl=Uv%nC i 2 g, o cl Cons�ded- Gov S�rGe..� 0/omin 11 r, Q _. /,�a� ('sa) (D• �9s� Z'3Ca, dog) 'z. /ZZ,e 5 , CtS O n v,5co.o, � � yL a w w ram• rt � � /� Q1 ti n D . � n �i ae.)7) Z. D,o�3 ,."Q� �'��A%.-Jyi�er�-�y a'`o-,,►, �asf :S'r�t' '. aT . _lOx r%%Ps►,oww 3: —i ell 6hQCale,TenILcA� 4d✓w 2dV I i ! 1-37L 1- CLy F -o (- SCo 07 i L7 k7 ' I 60 Lk 2 rr s s L S� "ae O LA�A- ie.� r j'40 3 �i,l?�CD,37S� 3CQ,00S� IS z�„o 3 , C,e C� � 0,0�3 lolo o � ,4ZS)3Ca,00Y� Q _ 2 Ti 9y �'. /y, �. i 13 n I '(p. e o t. c, . P G v\ Ix Q =� Cn,33��0, is�)2•� �e,n�2c�� z d,l�c ,s A J2 - a, Z7 o,o ` 2 I I 1 _ C3Td� (,O,a (0, o o�� b ,o3 .Floes. zs- O C f3�,. ...C9t, 1 1 1 2,- O,ZLI c� (Yj-%1^ )1Q %d c %-ZIVWaG %. Ty tJ C o �- 12 4. ri D�o3 Lff 1 � 1 1 1 - 1 1 1 i La�ndmarH ENGINEERING LTD. ADDENDUM A February 13, 1987 Project No. 3721-EC4F-01-567 Mr. Tom Gathman, Engineer ' City of Ft. Collins 300 LaPorte Ave. Ft. Collins, CO 80522 I I I 1 r C RE: Sunstone Village P.U.D. Dear Tom: It is our understanding that your recent conversations with Mr. Dennis Messner of our office have resulted in generally satisfactory understandings of the drainage plans and report for this project. In that understanding, we would like to present to you our estimates of the reimbursable costs involved in the basin improvements accomplished as a result of this project. These include the construction of the swale and related appurtenances along the North boundary of the project associated with the initial phase of construc- tion, and the anticipated reduction of size of that same swale downstream as result of the construction of the "re- gional" detention facility. (See proposed "Exhibit B" attached, and "offsite" estimate included herein.) As you will recall from "Exhibit B", we have estimated the cost of constructing the swale along the North boundary at $207,550.00. This will, of course, be confirmed by actual bid data at the time of construction. The drainage study indicates that the detention pond reduces the need for the swale downstream of the project. The amount of flow which overtops the pond is in the range of 25 cfs. That amount can easily be carried in a small swale contained within the present 20' pipeline easement. Thus, the additional 20' need not be purchased from Bartran and the major swale need not be constructed. The costs thus saved to the system should in our understanding be attributed, and subsequently rebated to the Sunstone project, due to the cost savings made possible by the construction of the detention facility. Based on Mr. Bartran's land cost of $16,667.00 per acre, we have estimated that rebate amount to be: Main Office ' 2300 West Eisenhower Blvd. Loveland, Colorado 80537 Branch Office 2235 2nd Avenue Dale D. Olhousen, P.E. & L.S. Greeley, Colorado 80631 ' ENGINEERS / ARCHITECTS / PLANNERS / SURVEYORS d Loveland (303) 667-6286 0 Greeley (303) 356-6286 0 Fort Collins (303) 221-5550 • Denver (303) 629-7124 I I 1 11 1 City of Ft. Collins Project No. 3721-EC4F-01-567 February 13, 1987 Page 2 Total Estimated Cost Savings Construction Cost: $56,720.00 Land Acquisition: 36,734.07 Professional Services: 3,250.00 Total $96,704.07 In reference to our previous letter of January 20, 1987, enclosed, and in light of our understanding of the City's reimbursement policy, we ask that the City be prepared to collect the full basin fees from builders within the subdi- vision, and reimburse the developer from the proceeds. We understand that costs exceeding the total basin fees for the development are reimbursed in cash upon the completion and acceptance of the improvements. As to the savings in down- stream improvements, we understand that reimbursement for these costs are to be made from fees generated by the pro- posed Bartran project, or other areas benefitted by the savings resulting from the effect of the regional detention facility. From our discussion of February 12, we understand that these items can be set forth in an amendment to the Development Agreement. The Agreement with regard to cost reimbursement for Fox Meadows Basin Master Plan facilities is to include only the drainageway portion to be contructed with the initial phase of construction in accordance with the site improvement plans for the 1st Subdivision. Consideration for reimburse- ment for reduction of downstream drainagway costs is to be considered with the 2nd Subdivision (as yet to be submit- ted) . We look forward with you, to the completion of these needed facilities for the Fox Meadows Basin, and thank you for your assistance. Very truly yours, LANDMARK ENGIN ERING LTD. David Shupe �✓' 1"� v �'^"°� Colo. P.E. 5914 \ DBS/er Enclosure cc: Glenn Stephens February 18, 198' EXHIBIT "B" The Development Agreement for Sunstone Village - P.U.D. 1st Subdivision, City of Fort Collins, Larimer County, Colorado. COST ESTIMATE FOR MAJOR DRAINAGE IMPROVEMENTS Include only those major drainage basin improvements required by the adopted Fox Meadows Basin Master Plan. ITEM DESCRIPTION QUANTITY UNIT COST TOTAL COST 1. Storm sewer, manholes, end section, etc. a.) 24" RCP Type III 1740 L.F. $ 36.00/L.F. $ 62,640.00 b.) 36" RCP Type III 204 L.F. $ 62.00/L.F. $ 12,648.00 c.) 30" RCP Type III 75 L.F. $ 42.50/L.F. S 3,187.50 d.) 36" Dia. Flared Concrete End Section 4 Ea. $525.00/Ea. $ 2,100.00 e.) 30" Dia. Flared Concrete End Section 1 Ea. S525.00/Ea. S 525.00 f.) 24" Dia. Flared Concrete End Section 1 Ea. $525.00/Ea. $ 525.00 g.) Connection to Existing Manhole Lump Sum S 500.00 Subtotal $ 82,125.50 2. Channel excavation, detention pond excavation and rip rap a.) Channel Excavation and Grading 10,720 C.Y. $ 4.00/C.Y. $ 42,880.00 b.) Filter Fabric 3,060 S.Y. $ 1.90/S.Y. $ 5,814.00 c.) 3/4" Filter Rock 350 C.Y. $ 18.00/C.Y. S 6,300.00 d.) 4" - 6" Round Native Cobble Rock 330 C.Y. $ 20.00/C.Y. $ 6,600.00 e.) Preparation and Seeding 81,850 S.F. $ 0.08/S.F. $ 6,548.00 Subtotal $ 68,142.00 3. Right -of -Way and Easement Aquisition 40 Foot Wide Drainage Channel Along North Boundary of Sunstone Village - P.U.D. 2.071 Ac. $13,777.00/Ac. $26,532.17 Subtotal $28,532.17 4. Professional Design a.) Basic Design Services Lump Sum S 8,000.00 b.) Construction Survey Lump Sum S 2,500.00 c.) Materials Testing Lump Sum $ 750.00 d.) Construction Management Lump Sum $ 2,500.00 Subtotal $13,750.00 EXHIBIT "B" (Continued) 5. Other 10% Contingency $ 15,000.00 Subtotal $ 15,000.00 Total estimated cost of Storm Drainage Improvements eligible for credit or City repayment $207,549.67 Prepared by: Title: Address: 11 I Sd L ,t an mar << ENGINEERING LTD. January 20, 19°7 ' Project No. 3721-EC4F-02-567 Mr. Tom Gathman, Drainage Engineer City of Ft. Collins P.O. Box 580 Ft. Collins, CO 80522 RE: Sunstone Village, P.U.D. - Drainage Provisions Dear Tom: As you are aware, the development of this project including the construction of facilities for basin drainage improve- ments will result in costs to the developer which are to be regarded as reimbursable by the City.drainage utility. This developer plans only to produce building sites for sale to builders. Therefore, the normal method of giving credit by means of reduced drainage fees as compensation for the reimbursable drainage facility costs, if handled directly with individual building permits, would result in savings to individual builders rather than reimbursing the developer for his out of -pocket costs. In order to more directly facilitate the reimbursement of the developer, and on his behalf, we recuest that the City adopt a policy for this project of collecting the full drainage fees as required for the basin from individual builders, then reimbursing the developer cn a monthly or quarterly basis. This would provide direct reimbursement to the developer, to which he is entitled. As you know, reimbursable fees cannot be added to the cost of the lot on an appraisal basis and, therefore, it is extremely difficult if not impossible for the developer to raise the price of his lots to compensate him for the re- duced drainage fees. In his view the developer feels this method would not significantly impact the City in terms of significant additional overhead costs. The developer con- ti:.ues to feel that some ver•1 clear expressions of major City, participation in the ccst of a regional detention facility were received by him early in the planning process. Main Office 2300 West Eisenhower Blvd. Loveland, Colorado 80537 Branch Office 2235 2nd Avenue Dole D. Olhousen, P.E. & L.S. Greeley, Colorado 80631 ,y ENGINEERS ARCHITECTS/PLANNERS/SURVEYORS Loveland (303) 66' 6286 • Gree!ey i303) 356 6286 • Fore Collins (303) 221 5550 • Denver (303) 629-7124 City of Ft. Collins Protect Ne. 3721-EC47F-01-567 January 20, 1987 Page 2 Since such participation is now understood to be unavail- able, this more direct program of reimbursement of costs which are so subject would at least mitigate the problem to that extent. we would appreciate your giving this process some thought and letting us know at an early date your feelings regarding this suggestion. Thank you for your consideration. Very truly yours, LA ENGINE ERI 'LT IMVid Shupe / Colo. P.E. 5//_S14 DBS/er cc: Glenn Stephens Tom Peterson Ted Shepard I I I I I I I I I 1 I I I I I ESTIMATE OF COST Prc?-lct SLAf.VNSo y 10% f L Date 2— rro ec_ No. 21 F i-S��Est4mat 3'f - EcK -o a By DlLvr Checked By trice Quotas itaTt I Cescri ticn Quantity I Unit ' Unit Cost ,l Total Cost i 4 � 1 I G �/21 ►ti I i I A• _(�s�- Lem Mot -A- play. eS %Ne, -- Sce-,, w►}'A\ r✓ fL 4a ,� ct�' °° I s 730 i LJ , �75 joyeD -- 38rpoo i I !0 7Z0 ) I ST 70-13 ;i21 nA Z O Z Project Project .10. 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