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HomeMy WebLinkAboutDrainage Reports - 11/03/2022kimley-horn.com 3801 Automation Way, Suite 210, Fort Collins, CO 80525 303 228 2300 September 23, 2022 Dan Mogen Development Review Engineer 281 North College Avenue PO Box 580 Fort Collins, CO 80522 RE:Krispy Kreme – 4624 Mason Street Drainage Narrative Dear: Mr. Mogen We are providing a detailed memorandum showing the increase in impervious area and drainage design for the proposed site and comparing it to the existing site conditions. This drainage narrative provides a summary of the existing and proposed drainage conditions associated with the proposed Krispy Kreme building at 4624 Mason Street located on a .781-acre parcel. The existing site is stabilized by the existing building, parking lot, drive-thru aisles, and landscape area. The project area is anticipated to disturb ±0.36 acres. This disturbed area is also detailed on the submitted Minor Amendment plans and included in the attached Exhibit A – Proposed Drainage Map of this letter. Table 1 below is a summary of the anticipated areas and Table 2 below is a summary of the Impervious areas: Impervious Area Information – 4624 Mason Street Site Basin Area Existing Drainage Basin Pavement & Roof Area (Impervious Area)30,500 Square Feet (0.70 Acres) Proposed Drainage Basin Pavement & Roof Area (Impervious Area)31,447 Square Feet (0.72 Acres) Change in Impervious Area 947 Square Feet (0.02 Acres) Table 1: Impervious Area Information (See Exhibit C for full calculations) Statistical Site Information – 4624 Mason Street Gross Project Area: 34,020 Square Feet (0.78 Acres) Proposed Building Area: 3,592 Square Feet (0.08 Acres) Total Disturbed Area: 15,777 Square Feet (0.36 Acres) Table 2: Statistical Site Information City of Fort Collins Approved Plans Approved by: Date: Dan Mogen 11/03/2022 Page 2 kimley-horn.com 3801 Automation Way, Suite 210, Fort Collins, CO 80525 303 228 2300 The increase impervious area for the entire site is 947 Square Feet (SF). This increase in impervious area is due to the addition of the existing building expansion (185 SF) and updates for truck unloading area which removes an existing landscape area. In the existing condition, 8.77 cubic feet per second (CFS) flows downstream from the project area in the 100-year storm event. Runoff flow is increased by 0.14 CFS in the proposed condition for the 100-year storm event to 8.91 CFS. The project site was previously studied by Adam-Avery, LTD. with a written Final Drainage Report approved 12/07/1995 (See Exhibit D). The project is intended to upgrade the building and site to fit the needs of the proposed tenant. Basin A historically includes the building, drive thru land and all parking on the north side of the site. Runoff historically flows overland towards a 8’x6’ box inlet with a slotted manhole located in the northeast portion of the site. The existing inlet connects to existing public infrastructure. Proposed flows follow historic flows by conveyance through existing curb/gutter and a proposed 2’ wide pan to existing 8’x6’ box inlet with a slotted manhole. The additional 0.14 CFS is proposed to go to this inlet in the 100- year storm. The existing slotted manhole can hold capacity for the minor storm. For the major storm the spillway is East of the inlet onto College Ave. Basin B historically includes south side of the parking area. The study encompasses the full property limits. Historically, this basin drains towards an existing sump inlet located on the parking bay south of the site. Limited disturbance is anticipated in this basin, proposed changes include removing and adding landscape islands, stump removal, and proposed tree additions. Equivalent runoff coefficients for existing and proposed conditions are calculated in Exhibit C. Ultimately the flows end up within an existing 18-inch RCP storm sewer pipe that conveys runoff to the Mail Creek 8’X8’ box culvert historically. In conclusion, the added runoff from the added building square footage and impervious area is not anticipated to negatively impact the existing site or sites upstream and downstream of the site. Please contact us with any questions or concerns. Thank You, KIMLEY-HORN AND ASSOCIATES, INC. Emily Felton, P.E. Appendices A – Existing Drainage Map B – Proposed Drainage Map C – Rational Method Calculations D – Existing Master Report . Kim ey>>> Horn Page 3 EXHIBIT A — Existing Drainage Map - . . :� � . . . - � . . • :� � �� ooca-ezz(coc)szsoa oavaoioo'srvmo�iao� g o�z aiins�M Nouy�+oinv�oac =- db'W 3�JHNI'dLld�JNIlSIX3 ,ysp a3aY 's3ivioossv ary NaoH-A3�wir zao�o � 5 � � O .� S1N3Wl1�00 NOIl�ll2ilSN0� „ U�O�/���� �I� o o OOY2iOl00'SNIl10012lOd W € o �r \ � �� �w3a��dsia� ����� �,v 3; a� �a �U _ F a - � a � � k _ � i w w w w m� o w i � _ I � � 1 � � � Z � � � a � W I I I J I I ----- � -- � _------------------ __ - - - �p = _ ��w �o r .,� ; �� (-o �M�o�a s�oq �� -anv ior��ao s - - ���. wlm �, �.-� po'o - \ \ \ �..,I��T s�F� —44�:�Po±� �_ �� N������i�' \ _" J �. x� ap °�• -�— ;7—____-- I__�__ _—__—__�_ "� 1 "�'/"., I�. - � � -��,--�'°��----= ---�- -= �� � i r-� '��,, � � � r ' ' ' \ , �a i , .�i — ���d,•�o;, ° i �� � i w �n����i I r�� L�_.���,� � x �i i i �o i ' I� ... � �i i -- u i i e°��LL;° I � � i ! � i i ° i — � I� '; ' A ' � ii N i � I p i � ��al_f.�l�.�ve_._�_t_� — , �—e-� `� � i � ° � ` � � � �� - � �d,��,�,����.,�. �� �°� , � � ,. � — � , � � l` , � , �, � ��� , „ � I � �, � � � � i � � . � ,,,.�- �, � � . � s�, � . � \.-� "g� \ ` /`/�� � _ - \ V��``(•� " i � , � , � \°e� � � / vs�� � � \ /, \ � �, � � � �' S,. �, so�a, �g�o. / �6 /�i •G'%3 tl�Z001£1961 slaaysuol ddtl�suilloa yo�N�ZOOI£1961 I!ni�oau:ry Page 4 kimley-horn.com 3801 Automation Way, Suite 210, Fort Collins, CO 80525 303 228 2300 EXHIBIT B – Proposed Drainage Map ooca-ezz(coc)szsoa oavaoioo'srvmo�iao� g o�z aiins�vM Ncuy�+oinv�oae =- dVW 3�JHNIV210 03SOd021d ,�ysn a3.tY �i's3ivioossv arvv NaoH-A3�ww zzoz o > � S1N3Wl1000 NOLLOl12ilSN00 „ " '� � � > U�O�/���� �I� o_�o OOY2i0�00'SNIl10012lOd W �€ o U � � w� 3W32i�Il.dSlb�i ��,�� 3; a� �a �U _ r � o < o - � `� � - � _ �C�` - � _ i i a u W �., w <m� o W ' - � I � � Z � � � � � a � o W I I ,' ' -_ _-k _- � _� _ _-_-_ _-_-_-_- _- c 5 'y u�r - _ -o Rz��I �'� 'M'021 l9l �_= f ¢ (�a-M-o�a.s�oq _ 3nv»�noa�s - - ='o p I c � - / � - -1P6 iG -f-ryF ` ` � � ��il� ¢7 ��� � z,� � ��... � LL� -- ,—� ������ � --o�--------- � � � \ � �� ��� �. i ��� , � � � �� ' li �, f � ��'' � g/� "� � ,. �3rv3,d� ,• ,,6�� , b,a�. �. 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Kim ey>>> Horn Page 5 EXHIBIT C — Rational Method Calculations - . . :� � . . . - � . . • :� � �� 196131002 Krispy Kreme 9�19�2�22 Fort Collins, CO Prepared By: HPC Checked By: EPF Rainfall Intensity Time Intensity Frequency Tabulation TIME 2 YR 10 YR 100 YR 5 2.85 4.87 9.95 6 2.67 4.56 9.31 7 2.52 4.31 8.80 8 2.40 4.10 8.38 9 2.30 3.93 8.03 10 2.21 3.78 7.72 11 2.13 3.63 7.42 12 2.05 3.50 7.16 13 1.98 3.39 6.92 14 1.92 3.29 6.71 15 1.87 3.19 6.52 20 1.61 2.74 5.60 25 1.43 2.44 4.98 30 1.30 2.21 4.52 40 1.07 1.83 3.74 50 0.92 1.58 3.23 60 0.82 1.40 2.86 120 0.49 0.86 1.84 Note: Intensity values from the City of Fort Collins Intensity-Duration-Frequency Tables; Chapter 5, Section 3.4 of the Fort Collins Stormwater Criteria Manual, 2018 Edition. Runoff Coefficients Ta61e 3.2-2.Surface Type-Runafi Coeffiicients Tahle 3.23. Freqliency Adjustment Factars Surface T Runaff Coefficients Sturm Return Periad Frequency Adjustment Hardscape ar Hard Surface [years} Factor fC�) Asp3�alt,Contrete 0.55 2,5, l0 I.OU Roofto p �.95 �5 f.14 Retytled Asphaft 0.84 50 2_2d G ra+�e f 0.5U 104 I.ZS P a ve rs 0_50 Landstape ar Perviaus Sur#ace - ; Lawns,Sandy Sail,Flat Slope t Z% 0_10 __�_: �. : � Lawns,Sandy SQiI,A�g SIQpe�-79'd ❑.15 --�"iNOT ExcEEo THE �J_UL^f 1 Lawns,Sandy 5oil,Steep 54ope�7% 0.2U Lawns,Clayey Soil,FIaS Slope�2% ❑.2U Lawns,Cla e Saii,Flv Sfope 2-73'0 0.25 Lawns,Clayey Saii,5teep Slope�7� 0.35 Note: Runoff Coefficient values are from the City of Fort Collins Runoff Coefficient Tables 3.2-2 and 3.2- 3; Chapter 5, Section 3.2 of the Fort Collins Stormwater Criteria Manual, 2018 Edition. K:\NCO_Civil\196131002_KK Fort CollinS�Project Files\Eng\Drainage\Calc\Imperviousness and C Values.xls 196131002 Krispy Kreme 9i�9i2°zz Fort Collins,CO Prepared By: HPC Checked By: EPF Existing Imperviousness and Runoff Coefficient Calculations Basin A-EX Area(sf) Basin% I CZ Cio Cioo Lawns 7,748 27% 2% 0.20 0.20 0.25 Rooftop 3,592 12% 90% 0.95 0.95 1.00 Asphalt,Concrete 17,557 61% 100°/ 0.95 0.95 1.00 28,897 100% 72% 0.75 0.75 0.94 BasinB-EX Area(sf) Basin% I CZ Cio Cioo Lawns 2,000 18% 2% 0.20 0.20 0.25 Rooftop 0 0% 90% 0.95 0.95 1.00 Asphalt,Concrete 9,351 82% 100% 0.95 0.95 1.00 11,351 100% S3% 0.82 0.82 1.00 Proposed Imperviousness and Runoff Coefficient Calculations Basin A-PR Area(sf) Basin% I CZ Cio �ioo Lawns 7,105 25% 2% 0.20 0.20 0.25 Rooftop 3,571 12% 90% 0.95 0.95 1.00 Asphalt,Concrete 18,221 63% 100% 0.95 0.95 1.00 28,897 100% 75% 0.77 0.77 0.96 Basin B-PR Area(sf) Basin% I CZ Cio �ioo Lawns 1,696 15% 2% 0.20 0.20 0.25 Rooftop 0 0% 90% 0.95 0.95 1.00 Asphalt,Concrete 9,655 85% 100% 0.95 0.95 1.00 11,351 100% 85% 0.84 0.84 1.00 Notes: 1. Imperviousness,I,values per UDFCD Criteria Manual Volume 1,Table 6-3 2. Runoff Coefficient values are from the City of Fort Collins Runoff Coefficient Tables 3.2-2 and 3.2-3;Chapter 5,Section 3.2 of the Fort Collins Stormwater Criteria Manual,2018 Edition.Frequency adjustment factors were used for the 100-year runoff coefficient utilizing Table 3.2-3. 3.Soil is Altvan-Satanta loams with mostly Clay Loam soils of the Hydrologic Soil Group B per Web Soil Survey. K:\NCO_Civil\196131002_KK Fort Collins\_Project Files\Eng\Drainage\Calc\Imperviousness and C Values.xls N V LL oaa z� N=w �} � o� o �pTp m W`N' c0 u'i c0 u'i ��� �H N l0 U � a��"ir U + co rn co rn a U W � � o� o 2 U � Z (� _ m �C'JF rou�iro � �~ w�N � N � W J N Z Q � F coou� o co �ri co �ri � Fu� �u� � 0 0 0 0 a oavoowoo �LLvaovao �V W � � u') u7 u') u7 J ti � W � W Q� W H > o 0 0 0 � F a-�o 0 0 0 O o M N N N � � � S F .-. 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Kim ey>>> Horn Page 6 EXHIBIT D — Existing Master Report - . . :� � . . . - � . . • :� � �� ci ` W: . _ ... ..t , �:�;'�',�,1J � � ���° /_�'/��-- FINAt URAI!��,GE RE�OR� ��►��L�'� �E��A�R�►�� Arbor Plaza Shopping Center Fort Coliins, Co�orado � � Final Drainage Report � FAZOLI'S RESTAURANT � Arbor Plaza Shopping Center Fort Collins, Colorado �. � Prepared for: INTERPLAN PRACTICE LTD. � 933 Lee Road, Suite 120 Orlando, Florida 32810 Telephone: {4Q7) 645-5008 � � � November 6, 1995 � � 1 .� �' � Prepared by: , ADAMS-AVERY, LTD. 1380 Lawrence Street - Suite 870 Denver, Colorado 80204 � Telephone: (303) 820-4454 � � his unofficial copy was downloaded on Jan-04-2022 from the City of Fort Collins Public Records Website:http://citydocs.fcgov.com or additional informarion or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA ' � FINAL DRAINAGE STUDY FOR � FAZOLI'S AT ARBOR PLAZA P.U.�. � I. General Location and Description The Fazoli's praject is located in the northeast quarter of section 2, township 6 north, range , 69 west of the 6th principal meridian, City of Fort Collins, County of Larimer, State of � Colorado. The site is bounded by South College Avenue on the east, Ethan Allen on the south, undeveloped land of Arbor Plaza P.U.D. on the west, and Soundtrack on the north. The project � covers 0.83 acres which is currently undeveloped: Recent construction has installed a box culver# across the site to convey Mail Creek flows under the Arbor Plaza improvements. Completion of the box culvert pro�ect included filling the site to accommodate the Fazoli's improvements. There are no irrigation facilities in evidence on the site. Mail Creek is a major � drainage within the city. � II. Drainage Criteria The conclusions of this Final Drainage Study are based on the criteria presented in the City of � Fort Collins Storm Drainage Design Criteria and Construction Standards, May 1994. Developed runoff was calculated using the rational method for the 10-year and 100-year events. Since the project lies immediately adjacent to Mail Creek no detention is being � provided for this site. � III. Drainage Basins � The developed lots which are a portion of Arbor Plaza have installed storm sewer facilities which convey site runoff from the respective site to Mail Creek drainage. The box culvert construction rnentioned above connected the individua� storm sewers to the box culvert. The � only off-site area upstream of the site which does not have existing drainage facilities is the undeveloped parcel west of the site. Runoff from this area is negligible at this time due to the exisiing pervious surface and small area. The site area will be divided into three sub basins. � Basin A covers 0.34 acres on the south side of the parking area. This basin is partly covered with existing asphalt being used for parking by Ethan Allen. Basin A will drain towards an � existing sump inlet located on parking bay south of the Fazoli's site on the Ethan Allen site. The existing inlet has adequate capacity for the additional runoff. An existing 24-inch RCP will convey the runoff from the inlet to the Mait Creek box culvert. An easement will be dedicated � for the existing storm sewer on the plat. Basin B covers 0.73 acres of the site and include the proposed building, drive thru lane and all , parking on the north side of the site. Runoff from Basin B will flow overland towards a Type R inlet in a sump located in the northeast portion of the site. The proposed inlet will be connected to the Mail Creek box culvert. If the inlet were to become pluged with debris the � overflow would drain to South College Avenue. Sasin C covers 0.05 acres of the site in the landscaped area along South College Avenue. ' Runoff from this area drains directly towards South College Avenue. � his unofficial copy was downloaded on Jan-04-2022 from the City of Fort Collins Public Records Website:http://citydocs.fcgov.com or additional information or an official copy,please contact City of Fort Collins Utilities 700 Wood Street Fort Collins,CO 80524 USA ' 1 FINAL DRAINAGE STUDY FOR � FAZOLI'S AT ARBOR PLAZA P.U.D. � IV. Erosion Control � �� Soil erosion from the site will be controlled using standard erosion control facilities. Sediment � leaving the site is not ex�ected to be a problem since all the sediment will drain into the central inlet and the exfst�ng inlet. A straw bale inlet filter will protect the central inlet while a gravel filter will protect the existing inlet. Straw mulching will cover approximately 50% of basin B � in order to help prevent on-site erosion. A silt fence will be constructed around the perimeter of the site as to prevent construction activity disturbing the surrounding area. Furthermore, water trucks will be provided to keep wind erosion in check if called on by the City Inspector. An erosion control escrow of approximately $3,450.00 was calculated to secure the approved � erosion control measures. � , V. Conclusion The design presented in this report will provide facilities which adequately and safely convey developed storm runoff from the site and discharge it in an acceptable manner to Mail Creek. � • \1'�'��ti1��4,i��lllldl/////// �� �E � ��\\�.•°�� E•�Gtis 9�� � � ' Keith E. Hensel, P.E. _ � Colorado Registration No. 28345 = � � � fior and on Behalf of �-b �r,� �� �� ADAMS-AVERY, LTD. ����,cF,�N. •• ������ . ��//%�ON�C�'����` � � � � ' � his unofficial copy was downloaded on Jan-04-2022 from the Ciry of Fort Collins Public Records Website:http://citydocs.fegov.com or additional information or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA r � � � � � � � . � �t � r � �� i r � ' CALCULATIONS � his unofficial copy was downloaded on Jan-04-2022 from the City of Fort Collins Public Records Website:http://citydocs.fcgov.com or additional information or an official copy,please contact City of Fort Collins Utilities 700 Wood Street Fort Collins,CO 80524 USA a , � � °a ; � ' o �� � � � � o o � � � �..0 ;� au � t . .. ... 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DATE: _O�_��- . � idicate by u5e of a bar l�ne or s��nbols when erosio� convrol measures wi11 be ins�alled. �jar modificatians �o a�_ approved schedu�e may. require submitting a new scnedule for i�roval by tne City Engineer. - , - YEA`R � �' ��` � � MOi�TH � N � [� ! � � F I 1'� � t� I Y� � 7 � S I f� I ` � n � �_-__-_----------------------�-------- ----------------------------------------___--___ E '�RLQT GR�D��G _ ' i . k I .. � ND E�OSIO�V :CQNiROt � . ` - Sai 1 Roughi r�g � f Per�meter �arrier ; � � f Rd�itional Barriers I ' � Veaetati ve �te�hods _ E � . � � f soil Sealar�L - � � - 1 Other . � � � �I`IF;LL EROSTG�V COyTRCL ( � S I r�UCjURnL: : � � Sedimen� Trap/Sasin � ' j � InTet Fil Lers . � �-i- . . � ' Straw Barriers � j Si1t �enc� Barriers ' Sand Bags l � � Bare Soil Pre�aration � W ' j � Conta�r Furrows � � j 7erraci ng - �� ' _ -� P,spnalt/Concretn Paving� i I O�her : j � � � ' � � - i _ ' l V�GcTATI1JE: ' � � � Per,narent Se�d Plant�ng� � � � N�ul ch�ng/S�al ant � ; - j Temporary Seed Plan�ing� ;f � I. Sod Installa��cr� � � I P�ett3 ngs/�^ats/B1 ankets � � I Other � � � � _ � V -------------------------------------------------------------------------------------- � RiiC;LRES: i�STnLLED BY MAINTAIN�D 8Y GETA�ION/�4U�CHING CONTRACTOR � T� SU8�7ITTED APPROV�D BY CIiY OF FORT COLLINS ON I/Sr-C:198� his unofficial copy was downloaded on Jan-04-2022 from the Ciry of Fort Collins Public Records Website:http://citydocs.fegov.com or additional information or an official copy,please contact City of Fort Collins Utilities 700 Wood Street Fort Collins,CO 80524 USA -- � v U � i cJ `�' a � w � �� ' � v a � M I _ E ] �' �n , o d� 0=' � � N � i o N � w� ��1 � r � � � � h o v° � ' � ''' �.� i � `� � � ;O � �, �, ,, 11 � �,� �� .� _ � � - � ° � w �� � � �� � � 1� ,� � � ? � 3 � - S {� 1/ v o � � � . .+- � � � — ^�� l `0 3 � w `� � - _ � �� � — ( _ . _ 0 a � �_ ;` ` � � � _ J.... � �..i V � t N c� � �M� �. � N M ; a� � � � �s �� � r M Q � T ' =.s 4 `.= `� � � �� ^� � � � � �� �— �J �':i �� � nn .1 0 ? �,,,� �, _ � �"� " o v- �_ � � � � �1 .� °,w � ' � — `i ° � � ", � � �j ° Z ,� _'." °� � � z " � � � `�- °� � ;! E 1 �j O N� i� I I � � \�i- x � � t,� ;� � o�- � — Q 7 � � d oa l 5- �1 T n � �, � —► 2 Q y o _ _ , a � .� v' �� �� b � � u 1� � . l� �C 1� G � J 11 �ti , "� � �:� � � � �° o R'.. �� �}- Iy � a � � � � v '� Y' � d. c C R— � �%� � � ;� �.o � � �- ° � i y 9 `�fq� s o V , ' �� 5137HS OOL ybl'LL - � � � " Sl'a9NS DA4 LL't'LL ���y� . ' �� �g�'H5 i1S I Vt'Li "�% � � � � , 1 � � � � � , � � � ' , ' FIGURES ' his unofficial copy was downloaded on Jan-04-2022 from the Ciry of Fort Collins Public Records Website:http://citydocs.fcgov.com or additional information or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA 1 .. � � .. ... . _ . :. -- ... . � . ... . F . O 7 . . . . .. ... . . ..,. . ... ,. .. .. �� ._ ., ... ,. ' . ' N o �oA � vr � � U � 'O vi y>. C ��) � L O . . . . .. � . ... . . _ .. W - ' . . ��1 . ' ' � A p � 3� � y o ` 3 0 vo ao � o � � Y a p � � � Z � a= a � Q � a 1^ � a � � o � w 3 � U �U F- � � � 2' N� �'�' o p Q Q � �}„ � �o � 2 �- � � 1- Z I- �U '3�`d 3�3110� 'S '3A'd 3�3�10� 'S V ? � o � o � 'iS NOS`dW 'S o a � � ., � ., o � o� � �w 0 o .. � � , o0 � � �.o 3 �� 6�p O �, R� I C � O � O� C'O 3� L O I • ' VI\(1i1����+� •��\1 IL[\lA 11l11\��•� f� - ' � TABI.E 3-1 (42) . ��••� �RECOI'�MENDED •RUI�O�F COEFFICIENTS Atr'D PERCENT IM�ERVIOUS 1� � � . . • �Atr'D USE 4R • PERCENT .__ � FREQUEhCY �, SUR�ACE CHARACTERISTICS� II�IPERVIOUS 2 �:� 5 10 10�} �y� B�siness• � � � Commercia] Areas � 95 .37 .87 .88_ .89 , tr'eighborhood Areas 70. . 60 .65 .70 .80 �� Residential : . _ . - Single-Fanily * .40 .45 .50 .60 , Erulti-Unit �detached) �0� .45 .SO .60 .70 � �' ; Ifulti-Unit (attaciied) � 70 .6� .65 .70 .80 1/2 Acre Lot or Larger * . .30 .3�5 .40 .60 �' Apartments i0 .6�5 .�0 .70 .80 - - �ndustrial : �, Light Areas 80 .71 .72 . 76 .82 Heavy Acres � 90 .80 .80 .85 .90 !� . Parks , Cemetaries: 7 . 10 � .18 .25 •4� � Pla rounds: ?3 . 15 � .20 .30 .50 � Sc�oo�s: - 50 .45 � .5Q .60 .70 Railroad Yard Areas 20 .20 � .25 � .35 .45 - � Undeveloped A�eas : Historic F1oti�r .Rna�ysis- 2 (See "Lawns") � , Greenbelts , Agricult�ra� O��site Flow Analysis 45 .�3 .47 .55 .65 (when land �ase not derined) I' Streets: - -_ Paved 100 ' .87 . .$8 .90 .93 � Gravel �Packed) �0 .40 .45 • .50 .6Q - Drive and Walks: _ 96 .87 .87 .88 .89 �' Roofs: - 90� .80 : .85 .30 .90 Lawns , Sandy Soil � p. .00 .O1 .05 .20 �' Lawns , C1aXey Soil 0 .�5 .15, .25 .50 hOTE: �'hese Rational Formu�a caefricients may not be valid for large bas�ns. � � *See Figure 2-1 for percen� impervious. . � � 11-1-90 � � !}RBAty� DRRIi�IAG� AI�D FL000 COWTROL DISTRIC7 .' , � ' --...._.. ..- - -- -- - --•---•�--•�- . ._:- ---�-- • _ his unofficial copy was downloaded on Jan-04-2022 from the Ciry of Fort Collins Public Records Website:http://citydocs.fcgov.com or additional information or an official copy,please contact City of Fort Collins Urilities 700 Wood Street Fort Collins,CO 80524 USA • �=a��rr��������a�m��Mus���w�lo����.� •. �n�nnm����n���u■■��i�s��u�: ...� .....� .�.� � � �����%���iiuu���u� ����roo�uooamai�rn��� '� �► ���n����naoo�a � ���������n�r�nia� � a��u���m�mv�aw�ua�� � ���v�au�u�u��u��uu ■�ao���w�m��ui����a�a • • � ., ���■i�01����� � • - ���1�r�8�� � ���1w���1���� � . 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