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Drainage Reports - 06/02/1992
1 1 1 1 1 1 FINAL DRAINAGE AND EROSION CONTROL REPORT FOR PHEASANT RIDGE ESTATES PREPARED FOR NORDIC CONSTRUCTION AND DEVELOPMENT PREPARED BY STEWART & ASSOCIATES, INC. MARCH 1992 .7. •I, SITE LOCATION: 1 Pheasant Ridge Estates is located in the Southwest 41 of the Southeast i of Section 36, Township 8 North, Range 69 West of the Sixth P.M., Fort Collins, Larimer County, Colorado. The site is bounded on the South by the Larimer and Weld Canal (Eaton Ditch); on the East by Puebla Vista Estates; on the North by Terry Ridge Subdivision; and on the West by two single family homes on 11 acres. Both Puebla Vista Estates and Terry Ridge Subdivision ' are Larimer County subdivisions and not in the City of Fort Collins. The site area is 19.23 acres. ' EXISTING CONDITIONS: The ground cover over the site is nonirrigated hay. There are 15 to 20 trees located along the West property line and a few more trees along ' the Larimer and Weld Canal. The existing site drainage is divided into two basins. Basin "B" drains ' from North to South into the Larimer and Weld Canal. The basin area is 15.2 acres. The existing slope is 3.5%, more or less. Basin "A" drains from West to East to the Northeast corner of the site at a slope of 3.25%, more t or less. The basin area is 4.0 acres. This runoff is routed through Puebla Vista Estates into the Larimer and Weld Canal. There is no offsite runoff from the East, West, or South sides. There ' are about 10.7 acres that drain from the North across Basin "A". The 10.7 acres are undeveloped at this time. Both Basins "A" and "B" are in the City's "Greenbriar Outfall Drainage ' Basin". The existing runoff to Puebla Vista Subdivision from Basin "A" which ' includes the offsite flow is Q2 = 5.48 c.f.s.; Q10 = 9.71 c.f.s.; and Q 00. = 19.96 c.f.s. The existing runoff to the Larimer and Weld Canal from NO. "B" is Q2 = 5.51 c.f.s.; Q 1 0 = 9.50 c.f.s.; and Q100 = 19.48 c.f.s. DEVELOPED CONDITIONS: ' The site will be develped into 25 single family lots of approximately 0.5 net acres each. Basins "A" and "B" will have the same boundaries as the existing site. ' The runoff from Basin "A" will be detained in the detention pond on Tract "A". The offsite flows from the North are also detained in Pond "A" to help the poor drainage situation in Puebla Vista. The required storage ' is 30,108 cubic feet. .Pond "A" has a storage capacity of 46,800 cubic feet. The 100—year high water line is elevation 5002 feet. The pond has 1.0 freeboard with overtopping at elevation 5003 feet. The emergency spillway ' is at the North end of the pond. Pond "A" will release at the historic two— year rate of Q2 = 5.48 c.f.s. Water released from Pond "A" will flow into Pond "B" at the South end of the project. [] 1 [1 1 1 1 Pheasant Ridge Final Drainage and Erosion Control Report September 3, 1991 Page 2 The runoff from Basin "B" will be detained in detention Pond "B". The required storage of Pond "B" is 63,108 cubic feet. " Pond "B" has the 'capacity to store 64,377 cubic feet at elevation 89.3 feet. The top of Pond "B" is at elevation 90.0. The pond capacity at that elevation is 97,740 cubic feet. A spillway is designed to overflow at.elevation 89.5 feet. The length of the spillway is 30 feet. Overflow from the pond is into the Larimer and Weld Canal. The outlet rate from the pond is the two-year historic rate for the total 19.23 acre site of Q2 = 6.97 c.f.s. The two—year historic rate will be released to the Larimer and Weld Canal in a 12" A.D.S. pipe. The pipe capacity when the pond is full is Q = 7.11 c.f.s. Calculations and basin maps are included rankl in D. Blake, P.E. & L.S. EROSION CONTROL: �;;.TENE'�•••• r� �Y �� o• ro° R � , 7839 �.... yt 1e ,* ae�Qi CC Pheasant Ridge Estates is located within a moderate wind erodibility area and in a high rainfall erodibility area. WIND EROSION CONTROL: Wind barriers are to be installed when there is more than 200 feet of unbroken disturbed ground. The installation of streets and the leaving of undisturbed areas will insure that all bare areas exposed to the predominate winds are less than 200 feet across. No further wind erosion control measures are necessary. RAINFALL EROSION CONTROL: Pheasant Ridge Estates is divided into two basins, and each drains to a detention area which will serve as a sediment trap during the construction period. The existing site is a hay field with a good stand of vegetation. The lots are very large and so a big percentage of the site will be left undisturbed during the construction stages. Adequate erosion control can be provided by installing a sediment filter in the detention ponds plus leaving a major portion of the site undisturbed. The attached calculations sheets show the Performance Standard Elevation of the existing site, and the Net Effectiveness of the proposed erosion control measures on the developed site. The erosion control plan shows ' control methods. d (�= ' Phillip I. Robinson, P.E. & L.S. the proposed location and type of erosion 4502= & COMPUTATI James H. Stewart & Assoc._,._ Colorado Fort Collins, Co By: Date Client: No. qif If l..IProject: 1 '7' hkd By: to C D. Subject d, PR ...... .4 --J '� C Z.4 -T IF 9 ji Ja By Ch Su II C MPU N.. I , . f. Stewart & Assoc.! mes H. Fort Collins,' Colorado Date Ment: J kd By: Date Project: Job blect 1 wl- 1�1 110 Q_ <1 .. .. ... .. ...... z7 V4-1 T I 4 .4 5 1 -2 1. 4- e7 '2 1114, sk. f t t 11AV COMPUTATIONS ames H. Stewart & Associates, Inc. 214N..HowesSt. Ft. Collins, CO 80521 (303)482-9331 By: Date Client: SheetNo. of thkd By: Date— Project: tz— �r'=�Zob No. ,Subject By Ct su f MP 0 U T ATIONS. i L me's H. Stewart & Assoc. 1 1 • Date Client. �kd By: Date Project: bject Shsst blob Fort CoIll. a,' Colorado No. f o. 1 ion I µ ________.__. f 7— 50 212z I i i i i �, ' is I . � 7-- ... I" -. i.... I . - r•- _ ,._ I i _ -7A7-0 . . . . . . . . . . . . AO-Z5 2 -1� . 57- :.- A X Z KIP 71- o 7VcJ. AL Vic 01 r, Z JE r ONE CO UTI ATI Jaart & Assoc.] BY:mes H. itewD a is I Client: Chkd By: Date Subject P pa 4;.A�V7-115 -2 4r07T 4�W�r -- 5r ..... I f - ----- - --- Fort Collins, Colorado S ant No. of Job ro 1 OMPU t ,C TATION� i James H. Stewart & Assoc. i I j ' ! ; Fort Collins, Colorado ! By: Date Client�'�' ��%%''/ Sheet No.of Chkd By: Date Project*/� "7 ?i'�� t 'y ° - T'{7 Job NO. Subject ' i t G+�t•i/G i i I �� I .fil f i I I I i I �- ' '00 .9. I r^/ r i I I I I I I I I I i An)o�o 7p � DATE - - - - - - - - SHEET NO. - PROJECT 7x 1-5z, 7 C®MPU1'ATI QI ROS ! I - H. Stewart & A8soC. i FortColllne, Colorado f (mes . r• Date CllentS ! �r� —T— heat No.of 'hkd By: Date � Protect.' Job No. Subject 1 /_/�i�.-y,. - .,/• �_ �- i i I I i j .I ? � *ide I y� Oi� ��y� ;IJr/f L•iz ' " j� • f I �//i,'/ ! '' � / � I C'.�G� � l � � ; � - -i � . I I �.P'�% z.�c� I .�� ,•4-�h: Rio ,� c SUBC BY SHEET NO_f� '7, - — — — — — — — PROJECT NO_ ve� ....... . I Fort Collins, Colorado e7 Shoot No. of Job No. T OVA, ,p COMPU Ais Client:! Prniant. I NS 5-z -5, /* p i III �. _ Via; ._) (Z 4 7 72S 7-51 Z74 T .7 r SUBJECT----=- - - --'- - BY--`=`L'='�---- DATE �.:�;•,/' - - - - - - SHEET NO. - PROJECT NO.-- -- - ----- r ,:i��/!I!d��" .70 �� `GpvC.��"'T� ;�?�,�1/.. •:8..�'`7�1�..r wit/-:.G©7`.7 /.�:: � 1 ,�I r `f� a 67 /z 1 1 ' [1 r r Is :r I I I I I I I I I I SUBJECT BY DATE-L- SHEET NO. -,- PROJECT NO_ 'T t1l .177 7 ! I I H I I I I I s E,�' - -- — — — W-- BY DA I L u FF ZI SHEET 140.— PROJECT NO. -- L�tljXw/ z all 1 No Text DRAINAGE CRITERIA MANUAL RUNOFF 3 30 H 20 z w U W °' 10 z w a 5 1n w cr 3 O U 2 W F- Q �1 J 1 5 .1 r , I ,No I I I■■■■� moll •, 1, I' sm mom �/III �►I S%■■1I/�����■�■■� 2 .5 1 12 3 5 10 20 VELOCITY IN FEET PER SECOND FIGURE 3-2. ESTIMATE OF AVERAGE FLOW VELOCITY FOR USE WITH THE RATIONAL FORMULA. *MOST FREQUENTLY OCCURRING "UNDEVELOPED" LAND SURFACES IN THE DENVER REGION. REFERENCE: "Urban Hydrology For Small Watersheds" Technical Release No. 55, USDA, SCS Jan. 1975. 5 -1-84 URBAN DRAINAGE & FLOOD CONTROL DISTRICT No Text s COMPUTATIONS I By: Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331 Date 7)3) 31 Client: AlOrdic- CQqsfrU CI -loin Sheet No. -of Chkd By: Date- Project: Rheasoonf Ride,,g Gsf-cJef Subject Erosion e,-- o 4 t-o m Area �e n vl;r) d! F-rilod RcAi ri f`G I! ;E r1odt i4i .7 2,0i j SIN i/A. No rf0, i 79 0 Pc'r A r c�_ A 1u: diJrL) rr- e, C1 IrOP e7! C) !2j17 V�\ 0,0 3 i5fA 4A r el C^- ru, our"J! 4) 180 07 7i70 're- c:%- bare '7 4-:A t RAINFALL PERFORMANCE STANDARD EVALUATION 1 PROJECT: pheasan j STANDARD FORM A ICOMPLETED BY: p1FZ-DATE: ------------------------------------------------ 9 ) q� 1--------------- IOEVELOPED ERODIBILITYI Asb Lsb I Ssb ----`-`-- I Lb I Sb I PS ISUBBASIN ZONE (ac) I-(ft)--I (o) ---- I(feet) -------I------- I (;) i () ------- H)Sh ¢ . 0 7,0 12.6 I I I 13 Ni9h 13. 9 I /050 13.Z I 17.7 1 1 985 3.07 , BZ�i L6 = r740 Sb = rz. c )7,7 1 lo f s.2 3L 17.7 'I r[ -ra b) c HDI/SF-A:1989 JAMARY 1991 ------------ ------ 8-18 ----------------- DESIGN CRITERIA. EFFECTIVENESS CALCULATIONS --------------------- PROJECT: Pheascin�- Ridge Cstafes STANDARD FORM B COMPLETED BY: pig DATE: 9�3T91 Erosion Control C-Factor ? -Factor Method --------------------- Value Value Comment C3are soil SeJirneni Trap l.00 o,>o in bot✓, Ponds Pvrif conc. 0.01 1100 exls4in3 cover 0.03 /.. 00 COX cover MAJOF BASIN A� 13 PS-- 82 4 SUB BASIN A 0 ----------------------------------- AREA (Ac)-------CALCULATIONS ------------------------- ¢- 0 W/ c (f. - Fa c4 o r 0.31)(0.01) -+ (Z•77.)(0_03)t_�O.gZ)(I.O�) C T4ctar = 0.25 Wtd P - Fa+o r 13. `I I Wtcl C - Fa c+or 13, q C FaG�or `1�- 0"3 G or = d. 5 B 17.9 I CFI= = 83. Z 82.4- DI/SF-B:1989 1 1 1 1 1 1 CONSTRUCTION SEQUENCE PROJECT: PH6,fi5,'4t)T RlPrrf I}$T•- STANDARD FORM C SEQUENCE. FOR 19 '77- ONLY COMPLETED BY: DATE: 38 9Z Indicate by use of a bar line or symbols when erosion control measures will•be installed. Major modifications to an approved schedule may require submitting a new schedule for approval by the City Engineer. YEAR MONTH M I qIM I�' I. l ----------------•----------- OVERLOT GRADING •---I--------- I' •, •--------------------------------_----- .I WIND EROSION CONTROL Soil Roughing i Perimeter Barrier Additional Barriers Vegetative Methods Soil Sealant I I Other RAINFALL EROSION CONTROL. STRUCTURAL: Sediment Trap/Basin' inlet Filters 1 i Straw Barriers ' Silt Fence Barriers Sand Bags Bare Soil Preparation Contour Furrows ' Terracing Asphalt/Concrete Paving j Other i VEGETATIVE: Permanent Seed Planting Mulching/Sealant Temporary Seed Planting Sod installation Nettings/Mats/Blankets Other '_'__-----•---------__"---------------------'-••---r•---------•--•'- STRUCTURES: INSTALLED BY MAINTAINED BY VEGETATION/MULCHING CONTRACTOR DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON HOI/SF-C:1989 JAIIUA27 1991 � 8-20 DESIGN CRITERIA VA --- : . . - " " � .-.aiiii -, , . -, . .- :' i;- -, � .. - .. � .. .. .. - .. , � . . ... � . , . . � , ... - - '. --' I •, . \ . . I . .. � - I , , . 4 �� z.',� � . , _ _" - . I,- � , " - - - , - - -:T ' . -:-!�!�� r.:'trr-_-o_-t7rvz_j. . _� - -- . <'. . U4 -�: .I 1, '0�" - --,- - IQ - I - . j - � - . !���,�� 6� _� - t' , . .. I � 1.1 'v, '�rl'.�_W; �� �;'�� :� -7 ,.i, - - - , ..' - A "L,- - - - - .-, - � j , . . , ji� . 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