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Home My WebLink AboutGrading Plans - 05/23/2019�";; �:_:; �;: �� "t� �i�� c��r�e�� i�r,� May 22, 2019 637 Smith Street Lot 3 Blk 166, FTC B1901847 & B1902395 �� Accepted plan & released permits 5/23/2019 DJM Dan Mogen [via emaii: �tvtoc;en c{"r7ic�c-c�i�,car� Stormwater/Utility Development Review 700 Wood Street PO Box 580 Fort Collins, CO 80522 RE: Drainage Memo for 637 Smith Street — single-family residence addition + garage Building Permits B1902395 and B1901847 Dear Dan, I am pleased to submit for your review and approval, this Final Drainage Memo for the Single Family Residential Redevelopment of 637 Smith Street (Lot 3, Block 166, FTC) in Old Town Fort Collins. I certify that this report for the drainage design was prepared in accordance with the criteria in the City of Fort Collins Storm Drainage Manual and the Drainage lnformation for Residential Permif Applications Memo dated 10/2015. I appreciate your time and consideration in reviewing this submittal. Please call if you have any questions. Respectfutly, ;J 31480 � �:. ��y :-: ��... ...� � ��.........._�; Les Crawford P�" Colorado # 31480 l.oeated 'sn tlid T�sun L4t Lii'�J!'.tt wtt4�t �r ;;�16ins, C{3 St3��K �#rat�e: �%4.77�,l�ao� Em�i�: ��st�� eu�ra+�rfcr�s�.ct�€r� 1RIeh: �g�Grawr�crc�?�.co�ra �.�� ;I��r�� ati�r�� . � ` � � ;� � LOCATION AND SITE DESCRIPTION This project is located at 637 approximately 135± feet north of East Laurel Street in Old Town Fort Collins. The existing lot is 9,500 square feet with a small single family residence and a garage in the rear yard. The existing grading is classic Type `A' lot grading with the lot draining to the street in the front. The gravel alley in the rear catches only minute adjacent areas. Slopes are less than 2% in the area with the street gutter averaging 2.5% to the north. The public alley suffers from rutting and minor puddling but does adequatety drain to the north at an overall slope of 2%. Both public ways ultimately drain to the corner of Smith Street and East Myrtle Street. Per the City of Fort Collins Floodplain mapping and FEMA Map Panel Number: 08069C0979H Dated 5/2/2012, this project is not within any mapped flood hazard area. PROPOSED PROJECT The proposed construction will remove all of the existing garage, its foundation, and portions of the existing house roof. Then the construction of a two-story 1,077 square foot addition and 340 square foot garage and loft_ Final grading will perpetuate the Type `A' lot grading of the neighborhood with the high point being near the alley. Downspouts on both structures will direct roof runoff to the adjacent side yard/lot line swales. The lot line swales will carry only adjacent property runoff and are graded at 1 to 2% to the alley and the street. The addition of 2,377 square feet requires a Drainage Memo or Report and a Grading Plan by a Professional Engineer. However, the added hard surface is less than 5,000 square feet so the project qualifies for an Exception to the Water Quality and Water Quantity Requirements. Computation of the percentage of hard surface found it to be 48% after construction. No additional storm drainage requirements apply to this project. No adverse effects are expected because of this propased proiect. tncateci in �fd T�svn 24� ��rcen St�eet F�t� ;�lii€t:, C£l F7f3�2�+ �r�4ne: �?��.t��a Emzii: LesLL�sc,r�v.+�ar�fF'�:cos�i tR►s�: L�sC�a��nr��:��rn �_ i � '�: :', � �: �� p :#.: g "`.i; � ;`_� . � ,,:; � "'; �' � �:>_ e,<. t : . �'. � ;` �'%i `: q '�: ,, �;,. �:: �; F z � ;::: �:: , ;.. � ;:: ��,,� � �:; , ;�: ; ,�, a �`' i� � ;' - s:. � i;<_, � � �+�� .�. ��t� ��r��r�� r�s _ .__ _. __ EXISTING Front Walk Ex. House Ex Garage Garage Walk Rear Porch DRAINAGE CALCULATIONS FOR 637 Smith Street Fort Collins, Colorado NEW HARD SURFACE CALCULATION 105 SF 1,047 SF 340 SF 30 SF 136 SF PROPOSED Front Walk Ex. House New Addition New Light Welis New Decks New Patio New Pavers (8) New Garage Concrete Apron Gravel Parking Gravel Trash Pad TOTAL LpCa18�1 !ii diid 7il�,+Tl 2�2 if,�er� 5tr�et f=t�tt i:alliits� �:� �i�v524 1,658 SF PROPOSED - EXIS7ING = TOTAL 2,377 105 SF 1,047 SF 1,077 SF 128 SF 192 SF 432 SF 50 SF 340 SF 216 SF 340 SF 108 SF 4,035 SF SF of new Impervious Surface f �tQ�t6: � 1�.'! i u.`��`� � Em�il: Les{s'�FsCr��rf��;�r.v:oxt� ��Gii: ��S�Ir�t'e'iiY�1��,C�tFf � : � �r , � �' � WATER QUALITY AND WATER QUANTITY DETENTION EXCEPTION 2,377 SF of New Hard SurFace is less than the 5.000 SF allowed. Therefore the exception is allowed. t�Gatetl in i3i� T�u�n 2�2� =in�t�r� Stse�# ��f� c,3�?;�s. cQ ��z� �', �� Ph�ne_ Gf0.i7:;.t�n'� €anaai: � es:"��rao��ic�U��.c�� 1deb l.esL �a�;�icrd�'E.c��m k �� '�� . : _ _. ` �it� ��ri�� t��r°�� PERCENT IMPERVIOUS CALCULATION 637 Smith Street Fort Collins, Colorado s �: �. ' �; �, � .; �_ �:. � =; �' � � ;;.: �' � '' �_ r �;; � �:_ � � � � � $ � � � � 4 � �. f � , �; :t.:: f , t_= � J� � HARD SURFACE Front Walk Ex. House New Addition New Light Wells New Decks New Patio New Pavers (8) New Garage Concrete Apron Gravel Parking Gravel Trash Pad '/2 Alley YZ Street Street Sidewalk TOTAL 105 SF 1,047 SF 1,077 SF 128 SF 1 g2 SF 432 SF 50 SF 340 SF 216 SF 340 SF 108 SF 400 S F 720 S F 200 SF TOTAL SURFACE Lot Area '/2 Alley '/2 Street Street Sidewalk Street Boulevard 9,500 SF 400 SF 720 S F 200 SF 240 SF 355 SF I I TOTAL Percent Hard Surface L�cate�i in Q1d To�rn 2�2 ��intiet� Str��i �� v�a��:. co ��z�: 11,060 SF 48% Phnrse: G7k�.773.�6�0 Em�il. :.asc� � e��raYr[cr��E.ccm ��d: L�Sir€i'3�t�llf��_4',�R7 � �� -- -- --------- ,� ��;l5�'- �a� _ - - _ __ FRONT . f2EAl+ �' YAR�7 YARG� SET- � � �� 'K�D,� 13ACVq Y ,.�.�-.,:-.r .T.- -, ..� � � �.�—. 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I � r-- �, . �� , � � �� , � ' ��,G � �� i � � , , � � �� _i �,'��?,� �� `,. i ' ��'� �" � � � �I� � �µ� � � 1XSTORY �r �_ �\\��\1�� . � � J��, , � � � `�� ( - ,-, ; �v "_�� ' HOUSE ' i ; ��,L , J � �' � � � � � ' , � � Q � I � _ __ - - -- _�� ; 3 .� _ "�_`� _ � _ I. � .� D J__ .--� I ' ,1 � I ..._-- '� � ,_...%�� ' -.-''%' II ��L� � _r� ._ . ._.. �yj_p.�.Y.. ... . � .__ ._ . .._. ..__ . ._. .. _ .J � , . �� _ _� �. , �Q� � _ -- ' � , ° ' —.,,�. � �+ — sf.,17 ,_ ._..� .� �. _._. �. _._ ,._____ ._. ; � _ .�. �.:_�__�_._. .._._,� ._.., _____.�_�.__— ' � _. — _ ' � _ _ '�� _ _ � �� , , o �� ,� �'' �� I ', � .s� .. o � •� .��a� � � Cl JT�✓ I%�r1C.f� N A�' 1� I�% h� l�-L ��'�lv ,�� f �� '�T/r%,.+. 3' ✓�'r2i` tf �1 `�U r_...� t-r' +�✓ �FSf �' t/a-!_=r'd r.�; � 5 t= 8%;� i� G' EXISTIh IMPERMEABI FOR DEh 637 SMITH STREET FORT COLLINS, CO EXISTING + DEMO 1 "=20' Les Crawford PE � w �� --- �! � ;� � ��rt'�l 9 I ��`%° SITE DEVELOPMENT SOLUTIONS COLORADO'KANSAS`MONTANA`NEBRASKA NORTH DAKOTA ` OKLAHOMA * UTAH ` WYOMING 242 LINDEN ST FORT COLLINS CO Les @LesCrawfordPE.com (970) _ � �! �� .___ ._ ... ..._. _ .. __. ..___ ._ ..... _ .. .. ...... _ .. _ . .. ,. . ... . .. . _ �. . � - -.._ ... . __ .. ._ . _.. . _. . . �, �' ' i ... � � . .... .._ . . . . .. . _. ...: ; .-., �,., , .�.. _..> �� . : ,...; �.� i „ .;� _. .. . _ .. ..... ... _ .. .. . .. _.. . ' : .. . , REAR _ _ ___ _ _. _ __ � �.v�L�y_y1 y1 � so Fr oF cuRe __ _ ,� FRONT , �' YARD "/ii � �� H/�" e FOR CHANNEL AT � 1 W YARp �iJ� � � �i � r iz s�oPE'�` '� SETBAC ! SET- " BACK /` �✓ , I ��'�� /-�-� 1� J'�__� 7ry (,�a.�r � � 3,�' ,,..-, -F--- : I� � 1� � � � , � wg, �� _/ = il � �.. � . � f � f> �6�,�✓9L�— _ ��, _ — E ISTENG ! _-_.__ �.. .... .__ �. ,� � � t71 j- di m .. ._ � _ . I � �1 � �� i � t^�� ,p� � �q : .., . � � - - � �� C EW ETE i i �r� , � �� _ �,_. _ _ �--� � � �� _ -;�'� �} � SII� � ALK ; � _ ' �-�'' �� ___._.�_ � � .; , � Ai � g . , �,. .A � �� ; � , , ,,, � ��w � � � � � � . � � � TC REM N I' _ � _ � � I �, ��cK ' i ` " .�'�;�r� G-�'�:�� . NEw NEW 600 SF .-;_ �- i _,_ .� __ �� EXISTING � _� � ' ��; � coNc. `�� GARAGE W/ , �` =, � �_ , � i >- aPRON ; LOFT ABOVE ' � . HOUSE � � � -V � � 1 � NEW 1-STORY FF=4984.80 � '� J �FF=4983.5 ! I � � i � ADDITION � i J%: �� yt-� �v�'�"iJ �7f ; NEW COVERED STA R i i Di � i TO LOFT ' � ;_ I � ]?,� I3 -.. ....,! � C�NCRETEENT I � 9 � , � ' _. NAL�FENCE& 9 I�� ._ .��u, � �� . � �, � � SIDEWALK& i . .. GUTIO OP � EST YARD A�REA�} ATIO� ( � � � I� -��" � � � � j�j� I ' NEW GRAVEL � , .. �° � � { • ' 0 LJ. � � �_J L'. L..� �.. .rs�ru-. �. ; . i �,"�\ `�, y} �I � tZ�EP I I �'`�. �'� . , - - d� � �! . ,, . , . � T, � � ��. . �f°i. � � � � � � � !!�I! i",� ��i PARKING AREA � — - — � � � � U �- {� �y J: �� - � � �t ,.._.. �':... :.r�.. .._. ...,..:� __,. � .,.-. � 1 30 SQUARE PAVERS (B) _. n +!.r, . I,. �v �� . _ .. ._. ` � �� .. � �^ ♦ !. i , . , � 1''% � �E�a��'�'�'` 'i� . f� ��' � � � . O � i _ �� e.�s,., � � 0 �� a�� U�'�� , C� , l �" � `� � °d _ ��s`�r�' v N�TE� GARAGE T,�, WALL EL 98 ' 0" SHOWN ❑N ARCH SHEETS A6,3 AND A6,4 MUST BE CORRECTED T❑ CITY DATUM EL 83,8 FOR DO�R AT 83,5 T❑ DRAIN T� ALLEY AT 4% WITH ❑,1' LIP AT TOP AND B�TT�M �F C�NCRETE DRIVE AND ALLEY AT EL 82,8, HOUSE EGRESS W FDN I �,/INDOW � WELL ' WALL ' } , I ,�� w 0 � a !� _ � � 0 CURB DETAIL USE 4" THICK CURB AND PAN GUTTER TO CREATE DRAINAGE CHANNEL AGAINS7 WALL NORTH PR�PERTY LINE AND FENCE, ADJUST WIDTH ❑F PAN OF CURB TO ALL�W FORMING, SLOPE PAN 1% T❑ CURB AND 1Z TD STREET, DESIRED CURB HEIGHT 6" MAY BE 4" T❑ ACC�MM�DATE FORMING AGAINST FENCE DRAINAGE PLAN 1 "=20' 637 SMITH STREET FORT COLLINS, CO W � � H � Les Crawford PE SITE DEVELOPMENT SOLUTIONS COLORADO"KANSAS'MONTANA"NEBRASKA NORTH DAKOTA " OKLAHOMA' UTAH ` N/YOMING 242 LINDEN ST FORT COLLINS CO Les @LesCrawfordPE.com (970) 773-0610 � _ _ __�