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HomeMy WebLinkAboutBOARDWALK CROSSING FILING 2 MINOR SUBDIVISION - 76 93 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTSolutions by Kutter's Formula"= 07 P°C 55 o YI: 0.15 Slet,I _. - 42' i 9 v rr `ems. 36' .0001 6 - moo. •�� .0003 -27 0004 VOOS 1v. 24' ( _ 4 (� .0006 0003 1.5 i - 18- ..00 0007 3 C I - 15' 1?a 001 c _ 1.0 a I .004 006 one 4-.003 C 0 0'0.8 d- 09 Q 06 y 0.5 .04 04 :.. .06 .07 - �. .03 ... _.7, 4-S 11 03 r...._. .. � - .. S.O.l .. .. I . _ _ I ' .5 t f r 0.I l .. Fig. 14); Diagram for the solution of Kutter's formula for circular pipes i flowing full.;. j i II i F _ THIS MASS DIAGRAM TABLE IS FOR USE IN ESTABLISHING THE STORAGE VOLUME REQUIRED FOR THE 100 YR. STORM EVENT R.E.I. DETENTION SIZING 1 nn = Pi innff In) 3.31 = Area (acres) 1.66 = Release 0(2)*** TIME (min) INTENSITY (in/hr) C*Cf*A (sq.ft.) RUNOFF cu/ft) OUTFLOW (cu/ft) STORAGE cu/ft) 5.0 7.00 3.31 6953.1 498.0 6455.1 10.0 7.00 3.31 13906.2 996.0 12910.2 15.0 6.10 3.31 18177.4 1494.0 16683.4 20.0 5.20 3.31 20660.6 1992.0 18668.6 25.0 4:68 3.31 23243.2 2490.0 20753.2 30.0 4.15 3.31 24733.2 2988.0 21745.2 35.0 3.83 3.31 26630.4 3486.0 23144.4 40.0 3.50 3.31 27812.4 3984.0 23828.4 45.0 3.25 3.31 29054.0 4482.0 24572.0 - 50.0 3.00 3.31 29799.0 4980.0 24819.0 55.0 2.80 3.31 30593.6 5478.0 25115.6 60.0 2.60 3.31 30991.0 5976.0 25015.0 70.0 r: 2.33; 3.31 3240� _4 6972.Q 25429.4=. 80.0 2.05 3.31 32580.2 7968.0 24612.2 90.0 1.88 3.31 33613.3 8964.0 24649.3 100.0 1.70 3.31 33772.2 9960.0 23812.2 110.0 1.58 3.31 34527.1 10956.0 23571.1 120.0 1.45 3.31 34566.8 11952.0 22614.8 135.0 1.33 3.31 35669.4 13446.0 22223.4 150.0 1.20 3.31 35758.8 14940.0 20818.8 165.0 1.13 3.31 37040.2 16434.0 20606.2 180.00 1.05 3.31 37546.7 17928.01 19618.7 *** NOTE: -If C * Cf > = 1 , then C * Cf = 1 is used STEWART&LASSOCIATES 103 S- MEL9331 DRUM, FORT COLLINS, CO 80521 PH. 482-FAX 482-9382 Consulting Engineers and Surveyors By: Date: Client: Sheet No. '/ of Project: Subject: J o5 r-S, !.�� I i I �/� L�/�f h ,TO ;577' t J STEWART&,SSOCIATES 103 PH. S. ME482-9331LDRUM, FURT COLLINS, CO 80521 FAX 482-9382 Consulting Engineers and Surveyors By: Date:.A(,) Client: Sheet No. � of Project: Subject: F � � ���..��' ;���,'=��;:��._, l�ia�ram ��'" ���,✓%ter A Veo I I ..�.. i i! �' I I l _i I j � l _ e 12 STEWART&ASSOCIATES 10 S. 9 DRUM,FAX 4URT COLLINS, CO 80521 82 Consulting Engineers and Surveyors By: _ _J �� Date: Q Client: Sheet No. of Project: 1O 7.:�- Subject: 1:5-7 STEWART&ASSOCIATES 103 S. ME9331 LDRUM, FORT COLLINS, CO 80521 PH. 482-FAX 482-9382 Consulting Engineers and Surveyors By: Date: d Q Client: Sheet No. of Project: Zev 7'1 /Q/,V.V Ilt Subject: STEWART&ASSOCIATES 103 S. 2-93MELDRUM, FURT COLLINS, CO 80521 PH. 4831 FAX 482-9382 Consulting/Engineers and Surveyors By: Date: /II/ r 42Z Client: Sheet No. Z of �77 Project: Subject: 1-5 41 f STEWART&ASSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FUHT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: .JAG Date: Or' 9�� '-> Client: Sheet No. � of Project: Z, ©; T✓ O = /U v ip ', r. zr , Subject: 4r 4::: i I I I : I 95 iX 125U�9 �T i I = /;7; f i ij 1 i ,ze0• r I ✓:-VIJ , I STEWART&PLSSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FuRT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: Date: �..9:p —:! f- Of Client: Sheet No. Project: Subject: A/ STEWART8,6SSOCIATES . PH 48z 3 DRY X 482 9 COLLINS,82CO 80521 Consulting/Engineers and Surveyors By: Date: Od Client: Sheet No. of Project: Go7 Subject: I • 1 I Ike ! I l i j!! �; I! I I� i l i •; • I �_'---.' � ' � I I 1 i - � / �70 i'1�i I'T� I I I ! I ��Yi �.C�:J .�•_/� ,l:'��.: • I i I I I C�'G•p ( i ! • S�� + I 1 I I % � I 1 ( STEWART&ASSOCIATES 103 UR9382 S482-93. MELDRUM, F4T COLLINS, CO 80521 PH. 31 FAX 82- Consulting Engineers and Surveyors By: Date: /A/ Client: Sheet No. of Project: Z,�V7Z I�IIX7 Subject: 15 V IF I _AGG = (. D-_S"0�3. �� �� i . ' I I ' 1' I I G? a �`� =�' 10 12 I .. 1 .l . i I I �. I i �+� ' ,�I 1 �,,, '�i i �1��� �/,% I%� � I i i I i I I ....... ' 7 29, *2 I I I I —, I I I I'M! IMil STEWART&SSAATES • 103 S. MELDRUNOT COLLINS, CO 80.521 PH. 482-9331 FAX 482-9382 Consulting Engineers and Surveyors By: .40 Date: Client: � Sheet No. of Project: /2' Subject: 41 STEWART&kSSUCIATES 103S.MEL9331 DRUIc JRT COLLINS, CO 80521 PH. 482-FAX 482-9382 Consulting Engineers and Surveyors, By: Date: 10a, Client: Zp-4:!F-2 Sheet No. of Project: y, 1,4 Subject:-!�/�,�iy�?�u® ---- -- "41 elf R�1'0z- 1,-;,�Ii EFFECTIVENESS CALCULATIONS ------------------------------------ ------------------------------------- PROJECT: ( �t t� J qC �O ,.x1 Z - STANDARD FUPH B COMPLETED BY: UAIE: I-1 3 Erosion Control C-Factor P-Factor Hetltod ------------------- Value --------------------------------------- Value Comment StCT rC17Csz gfcQtZiG4� 1,00 .. O'so -5Tm3 6AIL. . (�AG"UZ2- I,00 0.SO CJZVI(L.c L �vJtz- 'mxD-7,5, 1,00 Gtl��ei. a4er O,S . I n o Poolv��A510 n - 0,01 ' 1,620 ---------------------------------------------------------------------- MAJOR S. SUB AREA UASIII (e) BASIil (Ac) CALCULATIUIIS ----- ------ ---- ------ -----.----------------------- -------------- RaDF P,o he, .49 ----------------------------------=----------------------------------- IIOI/SF-a:t989 - - - -EFFECTIVENESS CALCULATIONS--------------------- 1 --- -- ----------------------- PROJECT: LOT 3 EDA12h JC2,c-%r-STANDARD FORM B 1COMPLETED BY: � DATE: Erosion. Control C-Factor P-Factor Method -------------------------- Value Value Comment s«T1.00 ------------ -------------------- o,s� __- - _�j, e ?OL -- �✓C�Ti� SA)(- &,Z121mc> 1,00 0,i5O P1210/L N AsptMaxT �a2+t�c .:PoL T rILTFP_5 1,00 O,BC7 � 1210Tb twt)!Sr_� (-12AUQL P-4�e� VA rc (2it L- O , Sn 1,0 -F/�pvr�1J/1Tte. ---------------------------------------------------------------------- O,O 1 MAJOR PS SUB AREA BASINS (ro) IBASINI (Ac) + CALCULATIONS ----- 60-1 ------ �7.� . ----- I ------ 2,3A ---„------ 40 pre, C1.0� Z.3nn, 5z C �- 2-- .yoneC,Sx.$� �o0 1 •�� trout ... I�Q � • �,O It�ll T��I� v 'MIS T141� w.Q,¢i� I1+z wun'1' C►Y'z2 Youa.viN� ?-o1�r�N IT�fr�i�� 8�T VL'� 1`5�j � �Li1Z¢i�w.Q'. � �7v1351✓Q,1,T �a�J��"T. fg2a �4 �Cl.��ap ---------------------------------------------------------------------- HDI/SF-B:1989 / CONSTRUCTION SEQUENCE PROJECT: LDI•� BDa/�!�/��ii��sS/iYy ��i�fr 2 STANDARD FORM C SEQUENCE. FOR 19 ?,�/ ONLY COMPLETED BY: DATE: 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 I Q MONTH I h I ------------------- -------- OVERLOT GRADING I i WIND EROSION CONTROL Soil Roughing Perimeter Barrier Additional Barriers Vegetative Methods Soil Sealant Other RAINFALL EROSION CONTROL STRUCTURAL: Sediment Trap/Basin Inlet Filters Straw Barriers Silt Fence Barriers Sand Bags Bare Soil Preparation Contour Furrows Terracing Asphalt/Concrete Paving Other VEGETATIVE: Permanent Seed Planting Mulching/Sealant Temporary Seed Planting Sod Installation Nettings/Mats/Blankets Other II S I rl hlI v\I DI -I --------- ------------------i---------i--------- � I STRUCTURES: INSTALLED BY C . (a,,;�2�crrnZ MAINTAINED BY VEGETATION/MULCHING CONTRACTOR DATE SUBMITTED HDI/SF-C:1989 APPROVED BY CITY OF FORT COLLINS ON RAINFALL PERFORMANCE STANDARD EVALUATION ------------------=------------------ ------------------------------- PROJECT: f�a�iwytclZ C�osSiS 2..r , Lv-r- -,5 STANDARD FORM A COMPLETED BY:DATE: k� 1i 3 DEVELOPEDIERODIBILITY1 Asb I Lsb I Ssb I Lb I Sb I PS SUBBASIN ZONE ..I (ac) I (ft) I (%) 1(feet) I (o) I () ---------i----------- ------- i------- i------- i------- i------- i------- C�S�� Zoo 1 76 -------------------------------------------------------------- unTir.F-A•ioaq Lot 3, Boardwalk Crossing, Filing-2 Page 2 The offsite street, which is the south side of the access road on the south side of this site, will not be routed through this site. The west 200 feet of this access road will flow directly to South Mason Street. When Lot 4 of Boardwalk Crossing,. Filing 2, is developed, it will need to be routed through that detention facility. The east 400 feet of this road will be routed to the proposed access road that will connect this shopping area to the existing shopping area to the south. When Lot 5 is developed, this runoff will need to be routed through that detention system. EROSION CONTROL: The sequence of construction for this project is to overlot rough grade the entire site; then construct the sewer, storm drain and water system; then construct the building, curbs and parking areas. Construction will start in the spring of.1994. After the first phase of construction, the entire site will be subject to erosion. This site is in a moderate to high rainfall erodibility zone. The proposed detention pond areas will be used as a sediment trap. After the storm drain facilities are installed, straw bales will be placed around all the area inlets and will remain in place until the parking areas are asphalted, then gravel filters shall be placed around the area inlet until the project is completed. The site is in a moderate wind erodibility zone. The building and curbs will be constructed as soon as possible after grading is completed to help control wind erodibility. A silt fence shall be in place around the site prior to the beginning of any construction and shall remain in place until all construction and landscaping are finished. This report and calculations are in compliance with the City of Fort Collins current design standards and criteria. Franklin D. Blake, P.E. & L.S. enclosures DRAINAGE AND EROSION CONTROL REPORT LOT 3, BOARDWALK CROSSING, FILING 2 EXISTING SITE: The proposed site is located in the Northeast a of Section 35, Township 7 North, Range 69 West of the Sixth P.M., Fort Collins, Larimer County, Colorado. The site area is 3.311 acres, including the new right—of—way dedication for College Avenue and also the West 50 feet of the existing College Avenue abutting this site. The site is part of a replat of Lot 7 of the Garth Commercial Plaza. This site is situate on the top of a small knoll. The west 1.1 acres runs off to the west to South Mason Street at about 1.25%. The east 2.2 acres runs off to the east at about 1.6%. There is no outlet for this runoff. College Avenue is higher than the site'by 2 feet more or less and blocks the runoff. The site is covered with sparce weeds and grasses. The site is bounded on the south by Lots 4 and 5 of the proposed Boardwalk Crossing, Filing 2, which are undeveloped at this time; on the west by Lot 2, which is undeveloped; on the north by Lot 1, which is.undeveloped, and by KFC, which is developed; and on the east by College Avenue. Runoff from the southbound lane of College Avenue flows south in the gutter to Troutman Avenue. The runoff from College Avenue begins at the intersection of Boardwalk Drive and College Avenue. There is an existing 36—inch storm drain along the east side of this site. It is part of the "McCleTland Drive Interceptor Storm Sewer." This outfall from this storm sewer is south, eventually outfalling into Mail Creek. Allowable runoff into this system from this site is 0.5 c.f.s. per acre. DESIGN CRITERIA: The rational method will be used to determine the developed site initial and major storm runoff. Detention for the site will be based on the 100—year storm less the allowed release rate of 0.5 c.f.s, per acre. The mass diagram will be used to determine the required detention. All calculations and design consideration are in accordance with the City of Fort Collins Design Criteria Manual, except the historic 2—year storm will not be used for the release rate. DEVELOPED SITE: The proposed improvements consist of a 19,900 square foot retail store with a 10,125 square foot future expansion. The balance of the site will be in parking and landscaping. Access to the site will be from College Avenue, South Mason Street and Boardwalk Avenue. The site area used for drainage calculations is 3.311 acres. All runoff will be directed to the "McClelland Drive Interceptor Storm Sewer" through the storm drain system shown on Sheet 6 of 7 of the utility drawings for this project. This sheet is included with this report as an exhibit. The outlet rate for this. site will be 0.5 c.f.s..per acre or 1.67 c.f.s. from the site. Four detention areas have been designed and are shown on Sheet 6. All runoff from this site will be routed through these ponds. 0 _C9 a Winler Cl. l rble Dr. VICINITY MAP SCALE-/"=/000' DRAINAGE AND EROSION CONTROL REPORT LOT 3, BOARDWALK CROSSING, FILING 2 PREPARED FOR R. E. I. NOVEMBER 1993 STEWART & ASSOCIATES, INC. 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80521 303/482-9331