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HomeMy WebLinkAboutDrainage Reports - 06/15/1992w i PROPERTY OF ]FORT GOWNS uin MAY 2 11992 FINAL DRAINAGE & EROSION CONTROL REPORT FOR JFK PARKWAY (BOCKMAN DRIVE TO LARIMER #2 CANAL) FORT COLLINS, COLORADO SEPTEMBER 19, 1991 (REVISED MAY 19, 1992) PREPARED FOR: WAYNE K. SCHRADER PREPARED BY: PARSONS & ASSOCIATES CONSULTING ENGINEERS 432 LINK LANE PLAZA FORT COLLINS, COLORADO 80524 (303) 221-2400 PROJECT NUMBER: 91.13 JFK 7 "1 5� btw;#9 cv,,N � Z FINAL DRAINAGE & EROSION CONTROL REPORT FOR JFK PARKWAY (BOCKMAN DRIVE TO LARIMER # 2 CANAL) INTRODUCTION This drainage investigation has been prepared along with final plans for the construction of a 400' section of the JFK Parkway from Bockman Drive north to the Larimer #2 Canal. This study was prepared in conformance with the City of Fort Collins "Storm Drainage Design Criteria and Construction Standards." SITE DESCRIPTION The JFK Parkway is an arterial roadway which will eventually run from the Foothills Fashion Mall south to Harmony Road, roughly parallel to and east of South College Avenue. A section of this roadway between Horsetooth Road and Boardwalk Drive has not been completed. This project will complete a 400't portion of JFK Parkway approximately midway between Boardwalk Drive and Horsetooth Road immediately adjacent to the Toys "R" Us site. This construction is being completed by the adjacent property owners to fulfill -1- requirements set by the City of Fort Collins as part of the Toys "R" Us/Wester `Auto P.U.D. approval. The proposed JFK Parkway will be a seventy (70) feet wide street section in a one - hundred (100) foot right-of-way. A preliminary grade was established for the JFK Parkway between Boardwalk Drive and Horsetooth Road as part of the Toys "R" Us/Western Auto P.U.D. construction plans. This vertical grade increases from Boardwalk to the north at a rate of 2.0% which results in a six foot deep cut in the ridge line approximately 300' north of Boardwalk Drive. From here the roadway grades change to a 3% downward slope. This grade was controlled by the elevation of the Larimer #2 Canal and the existing improvements of the JFK Parkway at Horsetooth Road. HISTORIC DRAINAGE The JFK Parkway right-of-way, the property adjacent to the Parkway, and the south one-half of Bockman Drive all historically drained towards the Larimer #2 Canal. These areas are further outlined in Figure 1 as Basins A-J. Flows from these areas were typically undetained sheet flows that accessed the Larimer #2 Canal through numerous low spots in the canals south bank. -2- 5 3.1 tl PO ST-RACHAN CONTINENTTJ o ;ME •;__a_ • . 160.o Ie3.• es.) SUED I `✓ ! S I ON a v ® P,zs_' w ]s.0 _ • n N _ _ o � 10 .O ' 00 O . F_ENEY S B IVYSION ` < < i IV6.8 1u9.9 • 63. , • ® r 1 O a a n _ o m ^ N 30.51 3nr BSI 0 O ® (MIDV® P°p •1 Q I i o 9I�1 O c 005 Is m o"fl ® O 146.8 141.0 r 16].1 C 0 44fe 0 Z VV... w OJ ONO z OR N n 0 m ® truer • t 20031 �: 09 E ATORv HEIGHTS e'dj P A O~•�` 212. 10 2250.92 OS w wP n 10 0 65.0 i m CANAL P "0 300 TOYS 'R' US o / ' '•® 0 w WESTERN AUTO P.U.D. EXIST, p o ,••" • > 54 RCP 6 e 50.0 1 II� n LTD ® II v u Oo QP•a.5 ez apaC ss.0 Ilp oI o .0 �,� a �o -�'- III } M � m r9 n r. C: a 0 WESTERN - a TOYS°IRI US IiI I ?Iw °s ® UP ° o ! AUTO =f �I ` SUPP Lr_ UJ III a z a, 41 ® cm m sa.t0 LI mI U) •o z+ ® .aF � a 1 163.92 261.27 Q G. 62.3 5 N -L BOCKMAN DRIVE- I m •S to ®�1 I"' - 300 0 BASIN C- 0�42 a �� l`a 09) 3 136.27 ® TEMPORARY aUR. DETENTION ® O a OBSERV TORv HEIGHTS / I ® 5.02 cfs'° TEMPORARY F 9s ® a ALLOWED DETENTION ® ELEASE 131.7 BASIN D (5.I0ac) �� u 6 I �° Os 9 r N o / s� �� \ Il El O m ® O Cr 340. 18 O U / ;to 13 CO BASIN J (7.19ac) i' t' o %%I. ` c m o® o® 0o c/ W IkJ n 1u 0 t u ® s 1cr 09.0 �CF o 15 ® Q? / C / ° ss F m c � Z ® Jda•d '� { � �r 134 vI h`D0Y '4 07 Qh MD CO 0 F ® R04D ® p 14 w- N a z it PO Y 1 .0 161.0 127.0 a 1, r 320 324 328 IBOARDWALK ORIVE " 259.2 c ® y p �✓A. - • i THE F'OUFJTA INHEA ° PUD ,°° ®1'F I ST FILING n1 '• 0 0 0*/� ®1 0 e rO _ N S•T•6 � a � r s 10 12) 175 n u •� m• ° IIIi 16 I55 i> S NI 334.E 1 306.3 9 9 91 1 p]HEAD PUQ O.0 135.D 235.94 C M THE FOUNTA IIJ6S 1 PHASE ! I O N ES U 1 O 165. 16 48 �.O a O G 125 .0 165 !. a p5 m 14a,4 P .�I4I '44' O P FOUNTAINHEAD PUD ���' ® PHASE -THREE FIGURE I m ••���``'�1' BASIN _.AREAS The recent construction of the Toys "R" Us site and Bockman Drive have altered these flows somewhat. Runoff from the South one-half of Bockman Drive and a portion of Basin D are now collected by a drainage swale where they are conveyed to the Larimer #2 Canal. It was intended that this would be a temporary condition until Basin D and the JFK Parkway developed. This area also falls within the limits of the Heart Special Improvement District (SID). Drainage criteria outlined as part of this district restricts runoff into the Larimer #2 Canal to a rate of 0.87 cfs/acre of developed area. DRAINAGE CRITERIA The Rational Formula was used to develop flows for this project. The Rational Formula is an excellent predictor of flows in basins less than 200 acres. DRAINAGE UNDER DEVELOPED CONDITIONS This 400' segment of the JFK Parkway is being constructed independently of any development projects. It is the intent of adjacent landowners to complete this roadway to fulfill requirements which were part of the Toys "R" Us project. The drainage analysis and -3- proposed improvements therefore were developed to allow the drainage to functions properly once this section of roadway was completed and to include improvements which will allow future development to complete their drainage systems as well. In order to define these improvements, drainage basins A-J were developed as shown in Figure 1. A separate discussion of these individual basins follows: BASIN A Basin A includes approximately 0.65 acres of roadway and right-of-way along the east side of the JFK Parkway from Bockman Drive south to the crest of the hill. This area will be graded as a part of this project but will not be paved. Runoff will continue to sheet flow from southwest to northeast and will be collected in a temporary detention facility on the east side of JFK. When development is completed on property to the east of the roadway this water will be diverted into permanent detention basins through inlets or driveways as part of the future development. Approximately 6.5 cfs will discharge from this area during the 100 year storm once street improvements are completed. -4- BASIN B Basin B includes approximately 0.67 acres of roadway and right-of-way along the west side of the JFK Parkway from Bockman Drive south to the crest of the hill. Existing runoff will continue to sheet flow from southwest to northeast and will not change as a result of this construction. As JFK is completed, this runoff will proceed to an inlet or driveway at the southwest corner of JFK Parkway and Bockman Drive. The water will be directed towards detention ponds to be built as part of the developments on the area west of the JFK Parkway and south of Bockman Drive (Basin D) in order to meet the 0.87 cfs per acre release rate requirements. Approximately 6.7 cfs will discharge from this area during the 100 year storm once street improvements are completed. BASIN C Basin C includes approximately 0.42 acres of roadway and right-of-way along the south side of Bockman Drive from the JFK Parkway west to the crest of the hill just west of Mitchell Drive. Existing runoff will be collected by the Bockman Drive Street curb and directed to an inlet at the southwest corner of the JFK Parkway and Bockman Drive. This runoff will be diverted under Bockman Drive into the Toys "R" Us detention facility. This area will be exchanged for Basin F which is the west one-half of the JFK Parkway adjacent to the Toys "R" Us site. Basin F was included in the drainage evaluation for the Toys "R" Us -5- project; however, due to the final grades of the JFK Parkway it was not possible to divert Basin F into the Toys "R" Us detention system. BASIN D Basin D is the undeveloped area between Bockman drive, JFK Parkway and the top of a ridge approximately 250 feet north of Boardwalk Drive. This triangular shaped basin contains 5.1 acres and slopes from the southwest to the northeast. The construction of this segment of JFK Parkway will provide for a storm sewer which will be sized to accommodate permitted historic flows from the site. When developed, Basin D will include the JFK street right-of-way which is adjacent to the site and further identified as Basin B. A future inlet or driveway at the southwest corner of Bockman Drive and JFK Parkway will direct these street flows to future detention ponds. A separate storm sewer outfall will provide an outlet for the detention ponds. A summary of these flows follows: BASIN AREA ALLOWABLE RELEASE (ACRES) (0.87 cfs/acre) B 0.67 0.58 D 5.10 4.44 Total 5.77 . 14 5.02 DESCRIPTION West side JFK Development site These allowable releases are calculated based on the .87 cfs/acre release rate previously mentioned. A tem.porary detention pond will be constructed at the southwest corner of the JFK Parkway and Bockman Drive. An orifice plate with a 6 15/16" X 6 15/16" square opening will meter flows into the 15" storm sewer which will convey these flows to a temporary detention pond along the east side of the JFK Parkway. BASIN E Basin E is the easterly portion of the JFK Parkway from Bockman Drive north to the inlet at the Larimer #2 Canal. This basin is .36 acres and includes street improvements and right-of-way. This area is within the limits of the proposed construction. An inlet at the north end of the basin will intercept street flows and direct them to temporary detention east of this project. These flows will be metered through an orifice plate before discharging into the Larimer #2 Canal. As this property is developed these flows will be diverted into a permanent detention system. BASIN F Basin F includes .44 acres and covers a small section of the north side of Bockman Drive and the west one-half of the JFK Parkway from Bockman Drive north to an inlet at the -7- Larimer #2 Canal. This basin was included in the drainage analysis for the Toys "R" Us/Western Auto P.U.D.; however, due to the grade of the JFK Parkway it is not possible to direct these flows into the Toys "R" Us detention system. An inlet at the Larimer #2 Canal will be built to intercept these flows where they will be conveyed via storm sewer to a temporary detention facility along the east side of the JFK Parkway. These flows, along with the flows from Basin E, will need to be included in permanent storm drainage detention facilities to be constructed when property east of JFK Parkway develops. BASINS G & H A small portion of the JFK Parkway right-of-way lies north of the Larimer #2 Canal. Basin G is the west one-half of the JFK Parkway and Basin H is the east one-half of the JFK Parkway north of the canal. Basin G is approximately .10 acres and Basin H is approximately .07 acres. This area flows to the northeast away from the Larimer #2 Canal. The flows from these two JFK Parkway basins will not be detained and will continue to flow to the northeast. As this section of the JFK Parkway is extended to the north and development occurs on the adjacent property, these flows can be diverted to future detention ponds. Slope paving and riprap have been utilized to reduce erosion from this runoff. PROPOSED STO R M SEWER IMPROVEMENTS O.tO A4M`5 I A9'jMVe U0.2 C40AL EX1hTlUG eE"rAIUIUG WALL TOTAL uUoETAtweio ri-Owbx C0,00 Ol=VELOPED) aehtu cv i.b cfe BA'513j H 0.7 cf� *TO 0E 0Z-r,A1WE0 BY fu7U2E 0elJ5L0PY12.1.T. 06TA1wao FLC'WSS CaloO OEVF_t.oPEO) BAhIL7 8 lo.7cf1b DETAIuEO W PosJO W 0A610 G 4.0 cP0 ToYS'2' u , 0Wrr=L T10&3- BAh1W A 6.5 c4tt, OETAWEO 11.1 P000'B' 15A/S11-3 E 3.6 dy " " •• " t3A410 1= 4.4 cfb 5A31W J 64.7 cfs " '• • '• � I ( I uwoeeGeouwla -� OETEUT101.� III I Ex1aT. -rwlu 64">'4P IIII eA3IU G Q1op c 4.0 cRg I5_ec YIE TO TOY4 2' U9 OEYE UT101,1 OZIFIGE PLATE -ram Poe:A eR-:'r Ot=7'E7rTfIo1`t .9EDiYl�1JYAYlOU POWO A li II�� I I II�m` v 4 � . Oa� ' am �I 3 a i I I I II C„ I --71 I II I I II r V m 4 II I I II on ►I am d$ -- too . is I n 0� O C lu �l A Ford u N 07, Lu �urueE oe1vE 41 w �_TO TE1-LP: OETEl.YT/OU * � y r 0 &4.7 CF7 o; Il F ;URE 2 W z o . BASIN J The area between JFK Parkway and Landings Drive and between the ridge line just north of Boardwalk Drive and the Larimer No. 2 Canal contains 7.19 acres. Currently, runoff sheet flows from south to north where it is intercepted by the Larimer No. 2 Canal. Basins A, E & F also will discharge through Basin J as JFK Parkway is completed and as Basin J is developed. A temporary detention pond will be constructed to collect flows from these Basins and release them into the Larimer No. 2 Canal at a controlled rate of 0.87 cfs/acre. In addition, flows from the temporary detention pond on the west side of the JFK Parkway will be routed through this temporary detention pond. A 12 3/4" X 12 3/4" orifice plate mounted on an outlet structure will restrict flows. This will allow all drainage runoff from the construction of the JFK Parkway, and from the two proposed development areas along the JFK Parkway to be discharged into the Larimer No. 2 Canal in one location at the allowed rate as requested by the ditch company. SUMMARY PROPOSED STORM SEWER IMPROVEMENTS A proposed 15" storm sewer system will be installed in this phase of JFK Parkway (see figure 2) . This system will provide a drainage outlet for future development in Basin D as well as adjacent street improvements in Basin B. Basin B flows will be directed to the future 91 development via driveways and a future inlet at the southwest corner of Bockman Drive and the JFK Parkway. Temporary detention pond "A" and an orifice plate controlled outlet will insure that this system will function properly with an allowed release of 5.02 cfs. Flows from Basin "C" will be directed into an inlet at the southwest corner of Bockman Drive and the JFK Parkway. This runoff will be directed into the Toys "R" Us underground detention via a pipe under Bockman Drive. Inlets at the north end of Basins E & F will direct runoff onto property east of the JFK Parkway where it will flow into temporary detention facility "B". Detention Pond "B" will also collect runoff from Basins A and J. Eventually this runoff will be included in a permanent detention system as the site is developed. An outlet from this pond will be built to allow flows from both temporary detention ponds to be released into the Larimer No. 2 Canal. Riprap has been placed at the outlet to prevent erosion around the outlet pipe and inside the irrigation ditch (see attached calculations for sizing riprap). Also this site must detain for Basin F which is the west side of JFK. This is not a normal requirement since adjacent properties are normally only required to detain to the crown of adjacent streets. However, due to the site topography restrictions, this detention requirement will be imposed upon this site. In exchange for this, the usual site to be responsible, Toys "R" Us, will provide detention for Basin "C" (see Basin "C" discussion) MG EROSION CONTROL The existing right-of-way within which the roadway improvements will be constructed was originally irrigated pasture covered with native grasses. Most of this area was disturbed during the construction of the Toys "R" Us site and no measures were taken to restore this area to its natural state. The construction of these improvements will require further stripping within the right- of-way. Approximately three to five feet of fill material will be needed to build the roadway subgrade. Most of this material will come from stockpiles within the right-of-way immediately south of the project and from the proposed cut area within the right-of-way approximately 600' south of the project site. WIND EROSION The project site is protected from the west by the recently completed Toys "R" Us building and a landscape berm adjacent to the site. The proposed construction schedule is for spring construction when wind erosion would be minimal. No specific improvements for wind erosion are proposed. -11- WATER EROSION There exists a large potential from water erosion on this site due to the steep grades (3%-5%) of the surrounding terrain. Also, most of the adjacent slopes are barren, either because of Toys "R" Us construction or relocation of Bockman's lumber operation. Construction of a water line in the JFK Parkway right-of-way and stockpiling of waste material from the Toys "R" Us site have also left erodible areas exposed. The construction of the roadway improvements will substantially reduce erosion potential. The storm sewer system will collect runoff and convey this water to the Larimer #2 Canal via two temporary detention/sedimentation ponds. The roadway, curb and sidewalk construction will cover 80% of the existing area. Permanent seeding and mulching of the exposed slopes, stockpile locations and cut areas will prevent erosion from the remaining 20% of disturbed area. Temporary sedimentation ponds will intercept all flows and provide erosion protection for this site during the construction process. -12- BASIN SUMMARY BASIN AREA Q10 Q100 PERMITTED COMMENTS (ACRES) (CFS) (CFS) RELEASE (0.87 CFS/ACRE) A 0.65 3.5 6.5 0.57 DETENTION PROVIDED FOR IN POND B B 0.67 3.6 6.7 0.58 DETENTION IS PROVIDED FOR IN POND A C 0.42 2.0 4.0 0.37 DETENTION IS PART OF TOYS "R" US SITE IN EXCHANGE FOR BASIN F D 5.10 --- 45.9 4.44 PERMITTED RELEASE FOR BASIN B & D IS 5.02 CFS. DETENTION IS PROVIDED FOR IN POND A E 0.36 1.8 3.6 0.31 DETENTION IS PROVIDED FOR IN POND B F 0.44 2.3 4.4 0.38 DETENTION IS PROVIDED FOR IN POND B G 0.10 --- 1.0 --- DETENTION IS PART OF FUTURE DEVELOPMENT TO THE NORTH H 0.07 --- 0.7 --- DETENTION IS PART OF FUTURE DEVELOPMENT TO THE NORTH J 7.19 --- 64.7 6.26 PERMITTED RELEASE FOR BASINS A, E, F & J IS 7.52 CFS. DETENTION IS PROVIDED FOR IN POND B TOTAL 15.00 ji 171 C PARSONS& CLIENT IJp l�rrr S�Y��rncil� JOBNO. T ASSOM TES PROJECT Ilf Q - CALCULATIONS FOR R -• `und rr CONSULTING ENGINEERS JW( 9 I6-II S Ft CoMr^ Cobrwdo 80524 MADE BY �/ DATF CHECKED BV DATF SHEET OF 1 1 Ei LP2y. _3%Q'__e I rnf Lil ;4•%1� l�i��_.1_y v�LD%I�P� _ AY_•D i e.,�y� 5�0 111�P_ D. CT�p�Hrll.)_ =5 g Cr�le_f�lyd" 1 lrlr r aif S/lei-=�Jl Vect M 20. ? B&res _ L ' 3300 1 D_/4� = J6__}Cvclj_l1r�c+a) - 3S inlef) - lei ' LPo — - ZI.O_�__Qr° — = j�•Z' orrq l_= _.. 86 I (�io,rs_o) r-- , — tar RG�I_ii.� ���. 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I/�l 13 '' r ASSOM 1 ES PROJECT _ `� f- K I ' y �W a CALCULATIONS FOR Lind( a rr d dew l,' CONSULTING ENGINEERS. _ Tw� /. rt/ •� j -= I Ft CoMu, Colorado 80524 MADE BY DATE CHECKED BY DATE SHEET OF — — _ni l 6a1f - Di, 0�36! yt/� — 1 } - -ON 1 ' I To yI I f/►d� ` -lLS' eof i f RAID= . __�d'�_�«?sl x 0, R.",e = I z CFs �_.r_80_� ! Comm[�Cla� S/ e i I ! I ! n __ s 7ZS' VJ IA Rf?) ! '(_C.L),I G7T�< yo�96 iJZS 7sz - 33oiz ,-, i Zo ! i S•'IS" _�ySZ__._ ' S%.yly-� IS�0.48__IT_iyy j316_ I ! ! ' fit I !rt 30 —i j - IS _ - '--- �f0, 8S 113 s8y -}— ' u, ...s7i__ , I dill _ ! I I 12 �- - — 37 620 ! ► ! Go —_2 Fob_ _95,!53.,7_Sy I I I r �u7/qM P SS. 200 it _ I � fr_�v� /,_ ZC,Jt2.(F!f, Y --t !p J C PARSONSrC&cES CLIENT o�� � 1��CI a�/ JOB NO. T" ASS0CIA 1 PROJECT I' CALCULATIONS FOR 7`MP"Ko^I�'�P��MI"�a� i ' CONSULTING ENGINEERS we H11-7Z 2 Z FtCollins. Cobrdo 805TA MADE BY DATE CHECKED BY —DATE — .SHEET OF i • • D _C Y_ �4 i i Iy .TM I I- � I ` pow ,lei I_ — ' I �-l_ — �OhGII 1W7 1 S; 0iL� • %TZ C! S 1125� L LS i i 1 =- 1 -�- __ II�-_ ` I cli C PARSONS& CLIENT ��n JOB NO. V /3 Irk ASSOCIATES TES PROJECT ^ r{I wa, CALCULATIONS FOR Qe f rl fife CONSULTING Cdorado 8052� ENGINEERS.//' 9 / Ft Coliiro. • MADE BY JYV " DATE J " - 1 CHECKED BY DATE SHEET OF >—T i— �0/ ?It'6 — — ----- - - rLc fit )_(lo0 (— 1 .�. l r 1 i I i . �� —I v NMI- (LIP)= boo �L t i i i 1 ' ' I -� ' Va�u•np �lf.�'0+9���1 �)0 G.. FF. S 0_X—:�._�___j I ce_,s� ed l ° _Z _fv�r__P_a�c{ 17 3t10 Wsx'3r =��3T : t �100� - ._, � /- 5�1 s ai�t : %� /nib �n/ (Im _a of 0_l�tOl!_T/C2r�6�f�0i. �J Gf/4/_' I i — —� - t II : I it F PARSONS & CLIENT �ch�ady JOB NOO..•. /�/I/I I��V�F ASSOCIA ! LS PROJECT CVA CALCULATIONS FOR Air* ` /' t ' CONSULTING ENGINEERS' I 7 Ft. CoQim• Colorado 80524 'MADE BV Jw r DAT �CHECKED BV DATF SHEET , OF C ( a� i s P1711. c/ 'Aff 1 iacr �! F ( r,, ; ii5 T i G APIj-�a • G� �� ._.� 1'1ax_��,u�r `-'-_ >f r I If tf- _ _-i.---'- ge l f'iCP ll�� .i zr 1 i i FI >° L- • � ITT � R .� � >-1-. SS a - r it l =1 IF�µ'( r/ C PARSONS & CUENT ✓Rl [(�Sckr T' � JOB NO. ASSOCIATES PROJECT in I ��' -' A� CALCULATIONS FOR •"sdf, ;; ` CONSULTING ENGINEERS /,/% - % Z FL Comm• Colorado BOSTA MADE BV �w ` OATF - �o I� CHECKED BY DATE SHEET OF - -T --j 0e, M _��f c • I 7- -rim ! c"119u 4 � v ! 0 P_�9lQr tT l Q pr - ; S i :?o—c�— �'1bx+iMu_lfi �_ia_v�.�;>_s use s I I 2,ZZ la�++u�r 74 =lOd - 2d j (/SP Zo _G _ryyffj� j 1-4 —711.1 No Text No Text No Text YS PROJECT: COMPLETED` DEVELOPEDI SUBBASIN � I � I 1� 0 I I F I I G � ! H I � I RAINFALL PERFORMANCE STANDARD EVA -TFK fa4Y/a/ 3Y: J-ffi coud E-RODIBILITYI Asb I ---------- Lsb Ssb ZONE ! (ac) I (ft) I W I ----------I------1I-------I-------i Meclira�t i 0. 65 1 5-70 047 j S1i0 z'S 0. yZ 4�1 67q 11•z r l S• 10 900 z S I n i o 36 l 300 1250 OS ! ,r I 0.07 a91 5-0! Z:o rl �7:Aq KO 1 i 15.00 Tofa I: i Wer�hdi./IYt�R _UATION ------------------=----I STANDARD FORM A j I -DATE: 11- Il -9 --Lb-- �--Sb---�- PS I (feet) I (%0) I (o) I i I .I I i I II I I I I j i l I ! I I I I I I I �I 176Y 2 z.2 j 81.5/0 I I I � I I I I i ! I I I I -I ------------------------------- -------- HDI/SF-A 1969 J � • EFFECTIVENESS CALCULATIONS ----------------------------------------------------------------------� PROJECT: in Paik wat STANDARD FORM B I COMPLETED BY: Jff f (oacb q DATE: 2- IZ 9 I ! Erosion Control C-Factor: P=Factor Method Value Value Comment ------------------------------ 464k ll�a(�s 0.01 ---------------------------- /; 00 �- Tfk Adval7/ecoc.aGr Ell,s1w9 GraJS 0,0� J 00 f]�aot nil dfsi aifjl Pl�ennial Coot Crops 0.as 1100 Aft,17 4/Af(t,ter u. j{a hKIG� adl 1,00 Srdrm.wf 7iap -------- -------------------------------------------------------------- 1, mo MAJORI PS I SUB• I AREA i SASINI IBASINI (Ac) I CALCULATIONS ----I------I-----!------ A BLS I = I 0 6S I------------- I Arta is ----------- ------------------ �Iarrc��fy sfocioile:d QeCq {d /u�/ca✓t/<<T 6f if$1tNCA ,dn01 MiNe� W•Xf/ Ice% if •4S %�C/e5 c=.o6 P=1.0- e E FF =. b _ (06 X 1.0)] Ioo 1•d0 loag of •`d h'reU 1 I I I FFF ! I I ! SoRA �e of go,Jmao' Orf� I 10 `IZ I Z8 �cas I I I I j � � Rauolui � ��Zci S�erdc� f�lrq , j.y lk�rs I I I I I I (0.01) (. _i I x off) :. 03 I I I I v2 Err-.::D fop I po Un rquC�l� Accq o{ na f�df 9�aSSPS I I I I I C= ,aY P=1.0 I I I I I a EFF : CI - ('05 n --------------------------- ------------------------------------------- HDI/SF-B:I969 o 1 s1 c s EFFECTIVENESS CALCULATIONS 4 =--------------_ ------------------------------------------------------ {PROJECT: JYK P�,�Way STANDARD FORM B { { COMPLETED 'BY:. f (/�� GWC 4 DATE: Erosion Control C-Factor P-Factor ----Method-_---------Value-------Value--------Comment ------ { MAJOR BASIN F M ------------------------------------------------------- PS SUB AREA - (%) �BASIN(Ac) ----- :-- �. CALCULATIONS -=------- Sl.s 0.�36 {-- C/ F � --------- G dff are ibe - Grrgr c�ecc—------- �2n4l v( = ,Ly 4C(fJ P= I W�Ifj l C: PYY#9 02 (0i FFF �l i o? x I-o)] " 97 0 � � Roadway - ; Zo aCas NUIA {--�i EFF Z. Cr - aY x I o) 96 bl S { { 0.14 b � � { Jrr�lyd A(iy = •oY Wir�7�{t1 (. io�)(.o1�f Goy)iot) �:� �,03 Sl. S 0,07 -------------- I/SF-B:1989 SuAeA l�(� _ • 03 wrylaf�d s ,Oy (o/) t`r o3)(V6 : ay. . EFF F I - (O22 x 10) j - 78% ----------------------------------------- y/S EFFECTIVENESS CALCULATIONS ---------------------------------------------------------------------- � PROJECT: jfg Pu/kwu/ STANDARD FORM B COMPLETED BY: Cou(4 DATE: P.11-91 Erosion Control C-Factor P-Factor I Method Value Value Comment I ----=----------------------=------------------------------ I I - I _ - t ----------------------------------------------------------------------i MAJORI PS I SUB I AREA BASINI (ro) IBASINI (Ac) I CALCULATIONS I ----- I------ i----= I------ - I--------------------.----------------------- I T .I 81 S .I I )• 19 I S Q goys - Wof Dalwthei I � z• I � A«r s SPcritrl d Mir I�6 Fd � I I I I I I I I Sedrmchf {raP I I I I I I I I I I We,b{fl `car 1(nk- 9) i I I II 7. Il .19 I I I I EFF ------------ DI/SF-B:1989 CONSTRUCTION SEQUENCE PROJECT: T1C K Pq 4a STANDARD FORM C SEQUENCE FOR 19 /Z ONLY COMPLETED BY: (/ TTj COUCH 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. i99Z YEAR MONTH J I F IM I LA IM IJ IJ Ig 15 10 IN ID OVERLOT GRADING WIND EROSION CONTROL I Soil Roughening f 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 UfifitliS .e Kok �IWft VEGETATIVE: Permanent Seed Planting Mulching/Sealant Temporary Seed Planting Sod Installation Nettings/Mate/Blankets Other STRUCTURES: INSTALLED BY VEGETATION/MULCHING CONTRACTOR DATE SUBMITTED j I i i I ' I I � 1 I � I i i 1 i i j I I I MAINTAINED BY APPROVED BY CITY OF FORT COLLINS ON J/ S C MARCH 1991 8-16 DESIGN CRITERIA