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HomeMy WebLinkAboutDrainage Reports - 10/12/1995REVISED DRAINAGE REPORT LOTS 3 AND 4, BLOCK 4. EVERGREEN PARK FOR JERALD RUSSELL NOVEMBER 3. 1994 STEWART & ASSOCIATES. INC. 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80521 303/482-9331 v E Willox Ln .00 _! A a o N Bramblebush St. undan GL indenmeie l r.,t, .. : � ,. 6 r Butch COss� Grouse Cir• Pry m C% t'7 1 o c vV o Windj��mei o` Peregrine Qo Ouail Run z Q O� Bristlecone Or u Run c C r t. �$ S� ,ose Hib �, r o Dr. QL Ct C i r n o 3 0` Fotia�� o u v L ? CR . Sifko )& St. S! w Clark St. > ry .St co v a_ v D: p� n U�l/ Conifer 5tZ'i �� Q �v \ N 1\ Lu inept' ernlockStl "--�— Yo ow Cit. z , Spurge Eno St Cit. z St U) 4 «� mt m Main St- - It o E. V'ne Drivecaco... hWP do 10 o_ / Trujillo St I Linden San Cristq St / Center I / r Romero St L 1 Buckingham St c t Qy� in in W Logan Av Logan v� cCt o� ` LL N f- u Lincoln Ave. a ti Trimble%bf �.°�\ v E. Mountain Ave. E. Oak S1, E. 02L Ct E. Olive St, Po dre STEWART&ASSOCIATES Consulting Engineers and Surveyors November 3, 1994 Mr. Glen Schlueter Storm Water Utility City of Fort Collins P.O. Box 580 Fort Collins, CO 80521 Dear Glen: Re: Lots 3 & 4, Block 4, Evergreen Park. The owner of Lots 3 and 4 is now proposing to construct an additional 4800 square foot.building. This site was originally designed and constructed in 1993. We completed a storm drianage report at that time and also an "As Built" plan for the project when the site was completed. Because there have been several drainage reports and addenda to the original report, I have recalculated the drainage design to verify what the existing site will be with this new addition. These calculations are included with this letter. The proposed building will be located 20 feet west of the east property line. A1'l runoff from this building will be directed to the existing detention pond. The owner will be required to construct a temporary gravel filter over the outlet pipe from this existing pond for erosion control. No other erosion control is required because all the grading is constructed, and the site is surrounded by a 6 foot high chain link fence. If you have any questions or need any more information regarding this site, please let me know. .*�,,,,,,,,,• Sincerely, Franklin D. Blake, P.E. & L.S. Secretary/Treasurer rsc enclosure James H. Stewart and Associates, Inc. 103 S. Meldrum Street P.O. Box 429 Ft. Collins, CO 80522 303/482-9331 Fax 303/482-9382 STEWART&ASSOCIATES Consulting Engineers and Surveyors By: Date: Client: Project: Subject: 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 Sa'e- // Sheet No. J of /I i� �il�_!y3s�`olI!!�!! /fib Z- i� I!, 10-1 !I STEWART&&SSOCIATES 103 PH. S. ME DRUM, FOR31 FAX T $OLLINS, CO 80521 Consulting Engineers and Surveyors By: �/4,4 Date: / 3 Client: - Sheet No. Z of _ Project: le Er':f'(41 Subject: j te r-- -i--- --I- I - T---- 01 1 ICI;' I� II it i� ;l�!!!I�II•I+�ii STEWART&OSSOCIATES 103 PH. S. MEL933DRUM1, FORT COLLINS, CO 80521, 482-FAX 482-9382 Consulting Engineers and Surveyors By: Date: Client: 2.0-.:re Sheet No. of Project: Subject: -J STEWART&ASSOCIATES Consulting Engineers and Surveyors By: Date: Client: Project: Subject: 42n �100:P'V�Fep 4�� le S 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 'e, '0V A10 -A 7 �__f _ - -----%N_GA_ e !off o.i .Ta _. . -7 10 1 i 7Z, go, I ar 7Z' 171 ),e oowle! . Sheet No. - i-1 of i 2 Ir V) O z T Itl I..L 0 W\ LL / zw 0 d' zz wQ W r�M^� 0 F- 0 0 w Ir f o o Ln o o Ln No ao o o o :' s o (D o v o n o v o N W m (O co v r r. 4 to 0 0 7: (7 M 6 Lo v r` 6 0 Lo v 00 r- O (D n T N L) M N 0:v v N O N (o CO O r` a OoNrnLncoMLnr�coD)Oo<'::'r-r-vCV) otTvvO Q I NvLnif) cD(DIl-r-r�r�1 rN ..;;nnr-r-Il-(D(D(D(D Q :3 � 0 U Q Cl) II LV 0 0 0 0 0 0 0 0 0 0 0 0,0. O O O O O O O O O (V v (D W O N N (,6O 4 (O 00 6 cV 4 O 7 c0 4 O (O (V O (D N 00 v T N Cr) 0) to N CO v ::. M r V(D w N (D v M OjF T M v (D 'OO O T N It (D N Q);; LO O) N LO c0 CO c0 CO) c0 J LL ~ U O O Ln 00 Lo N O O O O O >:k O (D O v Orl- O It O Lo O 4 (V r c5 Lo O c') O N CD' CV l'A O lT CV .- O (D N N LL O T (D to r` v It N r LO O N N CV) LO r v (D r v v O �• LL N v r� (D M OD v co N v r- ODCM (D h Q) 0) M CM r- 0)U U N v w(D r- n c0 Lb 0) O O 0 's. ". 0 0 0 O O T T T T (a I tu U Q O Lo to to Lo Lo Lo Lo in Lo Lo into :;id Lo Lo Lo to to to in in Lo LO o o o o o o o o o o o O :,;1' � O O O O O O O O O . . . . . . . . . . . U � U U co O O O O 00 LO M O to O O 0,:..,. LO M O w to M O M Ln O O T N (D T 00 LO N O OD (D::o O OD LO IT OM N T O n (D to v M M M M CV N: N r r r T T r r r U (n = � Z � O w•— Z ccxx — II (D 0 0 0 0 0 0 0 0 0 0 0 0 :b o 0 0 0 0 0 0 0 0 U[ LOOLo6LOOLOOLOOLriO; 00OOOL6c;uj9 O T T N N CO CO It v LO L) (D ::3 CO M O T N CO LO (O O CO L� C r z w 2 w w Ir z 0 z Z F— W < w ce) r) U) It F— 0 U.0 .j cr. 0 U) w r spugsnoU lRad DIUM do SHOOT 0 �D 0 z z 0 0 al cz 0 No Text DRAINAGE CRITERIA MANUAL RUNOFF 5C 3C F- 2 0 z w 0 cc w °• 10 z w IL 0 5 In w ¢ 3 0 U 2 cc W F- Q t 1 ���� ■���� ■ NAM �■ �� : ■ / . ' /�■ �,•' ���� MEN It �■■■■�_ ■■O� ��� ■■■■■�■ MIMI= MIIMFA■WMM AWA�MMMEME■� iii'eiFAiiiii i ii■■■i .2 .3 .5 1 ' 2 1 3 5 10 20 VELOCITY IN FEET. PER SECOND FIGURE 3-2. ESTIMATE OF AVERAGE FLOW VELOCITY FOR I 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 Q _ FLOOD CONTROL. DISTRICT nt o.oso C PA P Solutions by Kutter's Formula^=',0 55 ;I 0. 0.7 5 rl«r I I 56 ' Value,; r% ',I' ci i oo 0000uoo i Q�^•�� 30 ` i - 7 .000 33 • 7 . 70 �.'I.ZN �'o. 27• .0004 .0006 0007 40 O ; .0002 i - 30 �s /5• 0 002 j c L W _ 2.ra A. .005 •, t ' / a L ..I rk moo. /0• v �- 00� ••• . .' . - Q - .003of- h C l D C QB - 3• L ' • LZF 0.7 02 - — 4 o_8. a as / .07 y -5 .09 Q3 I 4.5 �. r 1 0J . • _� ZO I w -�j 2 Fig. W. Disgram for the solution of hutter's formula for circular pipes flowing full. /� _ 1 Fig. 16. Diogra!r r 1 0J . • _� ZO I w -�j 2 Fig. W. Disgram for the solution of hutter's formula for circular pipes flowing full. /� _ 1 Fig. 16. Diogra!r DRAINAGE REPORT LOTS 3 AND 4, BLOCK 4, EVERGREEN PARK FOR JERALD RUSSELL OCTOBER 1992 STEWART & ASSOCIATES, INC. 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80521 303/482-9331 DRAINAGE REPORT LOTS 3 AND 4, BLOCK 4. EVERGREEN PARK Introduction The proposed site is Lots 3 and 4, Block 4 of Evergreen Park, Fort Collins, Colorado. The site area is 1.378 acres more or less. It is located on the East side of Red Cedar Circle, 633 feet north of Conifer Drive in the Northeast part of the City. The project will be a 120—foot by 40—foot metal boat storage building, a 24—foot by 50—foot security house, a gravel outdoor parking area, and a landscape area. Existing Conditions The proposed site is in the Evergreen Park Drainage Basin. All runoff in this Basin is to Dry Creek. At the present, there is one developed site on Block 4 which is located on Lots 14 and 15. The existing site runoff is west to east at a slope of 0.70% more or less. The site was covered with weeds, wild grasses and dirt. Developed Conditions Because there are no existing drainage easements in Block 4 to allow the runoff to flow to the east, the site will be graded at about 0.50% more or less from east to west. There will be a detention pond along the west property line. The pond is sized to store the developed 100—year runoff. Runoff from this pond will be to Red Cedar Circle and will be released at the historic two—year runoff rate. The site is graded so that there will not be any runoff to other properties surrounding this site except to the east. This runoff is less than historic runoff. The driveway will be used for the pond spillway to Red Cedar Circle. The owners realize that, because there is not any way to discharge runoff to the east, this site is graded at a slope less than the City standard to make this project workable at this time. Because of the flat grade (0.50% more or less), it will be difficult for the contractor to grade the site. The results will probably be small areas of ponding on the site. The owners are willing to accept that fact and be responsible for the problems that may arise from this situation. A variance is hereby requested to maintain the slope of less than 2% without pans or underdrains. This site, when paved, will be required to meet criteria without a variance. EROSION CONTROL The boat storage building and the parking lot have been constructed at this time. The east one—half of the parking area has also been graveled. The outlet from the pond is not yet constructed. Lots 3 and 4, Block 4, Evergreen Park October 1992 Page 2 Because this site is almost constructed,. there seems little need for erosion control at this point in time. The project should be completed within two weeks at the rate they are going. Since erosion control measures were not installed, the applicant is required to clean up any sediment that has left the site. Franklin D. Blake, P.E. & L.S. enclosures SUBJECI _/cam/iY'-2:7 -- -----. ©Y— d'%�� t In l c .91 115 Z 1---��/9/•�rrl--O�--7 SHEET 110.--- --- -----_ PROJECT140.--- ��3SGo 70 y ZF-/ G; 3. 5 •5rOc - �zyD s D- 2 5 Z/ ! cJ��� J L - Oi �� x G X / ��O Oi �� G¢�s z. z 7a cis Z, 575 ,c /- 37S-, SUBJECI ---�� ----�---.---- ev—_�.x 7 ---• UnIL:1:�Y%9z SHEET tJO.--z- -- - - / C'= a, % ��/ �.� �i� a = • 12.4Xso) f(�za x 40� o- ����ac - Sx SD0 t 157 X ZO t /3 4D /378,-0/3�-p,/9� /38 x p. 9 f O• /99x 7Z. -7 SHEET PROJECT NO.------- I 71all / rc�v /,:�Ipofvop e I p SUBJE(:I -.,-- %a?/.' s�t�- V _�C _�� _ BY-�2Glt-- -• I)lIl-/�J�-�L -e-z- SHEET 110.-- --- ----_-- PROJECT NO.-----____- a�7G�T 3Z z h= 7Z0- 7//= D,9E 9 O,G �4XD,9 47/a9ia�ri p. � S- /o _ Do 7 Q- ®.ifs ��ia�� DRAINAGE CRITERIA MANUAL RUNOFF 5a 30 F- 2 0 z Cr U w °' 10 z w a 0 5 w cc 3 0 U 2 Cr w F- a I.1 1 ■rii'i0� ,s i� .r .• �,ii �■■ iiM ■ /CIA■■FA l� �_�� rAIIM�MWM■I/■W/I�=1MN1 ■ M :o :'■�:'D�:1'.�C 10101"1 .2 . .3 .5 1 'S 2 3 5 10 20 VELOCITY IN FEET PER SECOND FIGURE 3-2. ESTIMATE OF AVERAGE FLOW VELOCITY FOR I 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 THIS iS THE MASS DIAGRAM F C R THE DEfEI-FICN e,ASiN REQUIREMENT C(C-NA'UTED AND SHOWN AEOVE THIS MASS DIAGRAM TAELE IS FOR USE IN ESTAeLISHINGTHE STORAGE VOLUME REQUIRED FOR THE 100 YR. STORM EVENT EVERGREEN PARK LOTS 3 & 4 C- 4t1 r-Y-1 9S 4PFA-1 77R r ,f)%14T T"�Dlr' U=i FCC=- A1..(. 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