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Home My WebLink AboutGrading Plans - 10/07/2020Grading/Stormwater Plan Accepted (Building Permit Released) Accepted by: Dan Mogen Date: 10/07/2020 Memorandum T0: �� DATE: PROJ ECT: HDS JOB NO SU BJ ECT: Dan Mogen — Fort Collins Utilities Dan Egger, E.I.T. Jason Claeys, P.E. 10/07/20 1516 West Oak Street 20-1031-00 Drainage Summary HIGHLAND ��____ . =�.'T�L=P.VICES Lot 22 Blk 5 Scott-Sherwood ��Q11�� ►'' /' II'-il��i . �� . � � ,. � ,; . ' ' 'j . . � 1 .:'1;' � ��'�•.__ • : ..e��'� This memo has been prepared to describe the existing conditions and the proposed improvements related to the redevelopment of 1516 W. Oak Street. The existing property of 1516 West Oak Street is approximately 9,503 sqft (0.22 acres) and is located along the north side of Oak Street, directly north of City Park. A shared alley is located along the north property line and single-family residences adjacent to the east and west sides. The existing single-family residence is located within the south half of the lot and a detached garage north of the residence. All existing improvements and structures are proposed to be removed. The property is proposed to be redeveloped with a new single-family residence and detached garage with access from the alley. To evaluate the existing and proposed drainage conditions, the lot was broken down into two drainage basins. The existing Basin H1 contains the southern portion of the lot and drains northwest to southeast to Oak Street. Basin H1 is 2,555 sqft and is approximately 38.3% impervious. The existing Basin H2 contains the northern portion of the lot and drains to a low spot along on the east property line. Basin H2 is 6,948 sqft and is approximately 19.7% impervious. In total, the existing (ot area is 9,503 sqft with an impervious area of 2,609 sqft, approximately 24.7% impervious. The proposed Basin D1 contains the southern portion of the lot and drains northwest to southeast to Oak Street. Basin D1 is 3,575 sqft and is approximately 48.3% impervious. The proposed Basin D2 contains the northern portion of the lot and drains southwest to northeast to the alley. Basin D2 is 5,928 sqft and approximately 26.4% impervious. The proposed impervious area is 3,507 sqft, approximately 34.7% impervious. The proposed improvements increase the impervious area by 898 sqft. There is an approximate increase of 64 sqft of impervious area within Basin D2. Highland Development Services, Inc. 6355 Fairgrounds Avenue, Suite 100 � Windsor, CO 80550 � 970.674.7550 1516 W. Oak Street 10/07/20 Page 2 of 2 The proposed improvements are anticipated to improve the existing drainage conditions with the grading adjustments and installation of drain pans. The existing site is relatively flat, with approximately 0.6% slope within Basin H1 and 2.0% slope within Basin H2. In addition to the limited slope available, Basin H2 currently drains to a low point along the east property line. The proposed improvements within Basin D1 includes a curb and gutter along the east property line and a concrete pan along the west property line to convey runoff to Oak Street. Within proposed Basin D2, the grading will be adjusted to drain to a curb and gutter aligned along the eastern property line. The curb and gutter and a concrete pan will direct runoff away from the existing low point and to the alley. Based on review of aerial topography, the alley drains west to east to Sheldon Drive at approximately 1.3% slope. Due to the limited increase of impervious area draining to the alley, there should be no adverse impacts to downstream properties. This drainage analysis has been completed to review the impacts of the described improvements. The proposed drainage improvements provide protection to the new single-family residence and detached garage and benefits the neighboring lot. Since the increase in impervious area is below 5,000 sqft, onsite stormwater detention is not required. Based on this analysis, the proposed improvements do not adversely impact the existing drainage conditions and improve the conveyance of drainage onsite. i � - � j � 1 � � � � ��.i� \ �i� / � � \ �� -�'�` AERIAL TOPOGRAPHY ;' ,� i �,_` �� ; ��/ (PROVIDED BY FORT COLLINS UTILITIES) i�____�,` ,��'� ;� i� � NOT TO SCALE , �'--� i � �� i i' � � � — � i i i i `� 1�� i �� , � �� i � i�`� � �`� �� --'� `. � `— � �'� i� � `� �� '�/ \� � \�� i � � � � � � i . —` �A4�--� .'^� i � � �— _`�pp.}_—�� .. i �--� ✓ �`�-_, �� ALLEY � , ` � ` r __ _� � , � � i �\ a �--- � �; '------- ,---, �� •�_� � ��----� � j � i i �� — i � i i � / � `. � Z i ,,�c � i � i � `. � w � � /` 1i i � �` �� `--� �� > � � � �3 � � Q i `� -'' '� � % s � � � � � i i - � , � m � � i � �' i -� '� w i \_� � �� i �> > i ----- � ^� � `� / �^ i � vwi K : i --�� i /� i i 0 ._� i � � �` �'S�0—� (� ; i . `, �� 0 - �\ �� ^ �\ �� \ � � ` � � � 1 � 1 " - i 1 � 1 " � ( `� `� \ _ _� _i / � � � i� �� / � i i \�\ ��43.�/ I -�� \\ i'�� I � Q I i l�,�� r �� I �� cn � \\ i�� \\ � I �\ I �� \ \ �� 1 , � 1� 1 �� ; �` �� I % `I % I��`J'0�_-_11 / j I I I � I/r 1� 1 �� I I 1 \ /i � 1 1 1 1 \\\ l ��p��i� � ♦\ / / �\ � I �\ �� -'7� i �� % �� j � � V \ c- � � l � \ I �� j �� \�\ �� . \ I 1 � � ��'I �� 1 � I \ I �i� I I \ � �� ; ; �------ 1516 ��" % �� \ 1 �� ' 1 �' 1 �� \ � I' ��--�__\�J_`, ��-� �� \ I I I 1 � �� l \� / � � �._ � � \ � 1 I 1 � \ \\\_ i f � i __ \_1 / \ � 1 \ 1 i /� � I i / �-�� I I I \\ �� / �` �5(34� j 1 �i �i I / .. 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National Flood Hazard Layer FI RMette 105°6'35"W 40°35'24"N I�' I�:I�°�.11�1�. �� ►1`J��I�� - � � '' ' � �� " � . _ - a++1�.. . _ II;-yll�il� -i .�..c � � ' � 3 � /i � � �� _ _ � � � _ ��'� .�� - � �� M � � � �s r � : �l " "+��'; �� I iir , � ' �� .. � � i _� .� �'�L . , ;.� a — --` � i� � � I r�',,�* • - � � _ � � t � ' - `` � � { ` I.11 I ' �I��; � � � • �! �� . � } � ' �. � � � ��1 , � - Y � � �� _ � + �-� � M' �� , . . . _ . _ " ��;` FEMA �� - � � I� � • -� � � `� _ r� 1 I : � ,'. _ � �� ' �� '�_!��' i t � '_ , � � - � -. ;' � i .. � �� IT��,�- W 'US:S'ii�a f�d��irii�5(: Feet 1:6,000 0 250 500 1,000 1,500 2,000 � � � �� _ ��;�� t: �a �i � •� � �• � _ r � �f • � �� ..;�� M ; � �*. ,�► --.� �,�' a � +'�. r � �� -�� ; � + ' � � . �tl.�� i�8'!� ��F��''��i�� . � ` , �, ti: y I � � �� ' � - a� � i � • Y - i E � �� i - �,� � � �' _ � — r � � ;- � � f� r " �` '# � _ • s �� T �� c�,�aqery. ��i.� �efiA?rih�clsAr?ril �'G�'C� � • � L Legend SEE FIS REPORT FOR DEfAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT Without Base Flood Elevation (BFE) Zone A. V. A99 SPECIAL FLOOD WIYFI BPE Of D@ptll Zone AE. AO, AH. VE. AR HAZARD AREAS Regulatory Floodway 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile zo„e x � — � Future Conditions 1% Annual _-- Chance Flood Hazard zo�,� x Area with Reduced Flood Risk due to OTHER AREAS OF Levee. See Notes. zo�,e x FLOOD HAZARD Area with Flood Risk due to Leveezo„e o NO SCREEN Area of Minimal Flood Hazard zo„e x � Effective LOMRs OTHER AREAS Area of Undetermined Flood Hazard zo„e o GENERAL '--' Channel, Culvert, or Storm Sewer STRUCTURES � i i t i i t Levee, Dike, or Floodwall � Cross Sections with 1% Annual Chance ��.s Water Surface Elevation �- - - Coastal Transect �t+3� Base Flood Elevation Line (BFE) Limit of Study Jurisdiction Boundary --- --- Coastal Transect Baseline OTHER _ — profile Baseline FEATURES Hydrographic Feature Digital Data Available � No Digital Data Available � MAP PANELS Unmapped � The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 8/20/2020 at 11:08 AM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. � Hydrologic Soil Group—Larimer County Area, Colorado � � (1516 W. Oak St.) � �, 0 0 491120 4911'.,0 491140 491150 4911E0 491170 4911� 40° 35 11" N - � � _ � i l.`�� + 40° 35i1"N I + � � � � • � ' ��J r � 1 � � —_�� . ` — � r - � , � ,' y�=� `.., � ., ' �i� ' : � . ^�:�► �1. �,� - � . � '� - -, �•j,, ` i , r'. � . � •, � _ _ , . . � � • r � � � " �� " � ' -+� � _ � . � � ,,._- - - �- � ' � �3. �� '� - � �'• . i�+ -'!� � � � � � r�� . � � .�_- �' " � � r �- " �4 i _ � ! � .; . ' s 'I,-� r 4 +� � � � r _� �— . i ■ � � r- - �,� - '., : , �i� e � � i � `4 _ � �I, y� � . �' �••" � , ,� � + 1 � • �' a� 4��,= � � ' � � ��i ��. � - _�s� � o � ,' �' �' � � •� �> � _ � ' � �� r t �' I � _ / I . . � � � �' � ' 7 � `.�► .1 ,�� ♦ ' f. ' —S2 � - � ' S YS � ► • � �` � ` �' �� T �}' �. �� / � , 1� � � �. - � ' ?�� I � —i •,�• I � � ~� �'•� � ��• ,�'' � u � ` - - �� - u � ...... R� � � � �-••�� -_ �i � _ �--�. � - - � �� _ Q� �� ---- --�- � - � � - - � ��,�� Soi,l �Ma.p n�a�y �ot �eN�va,l�id�ya`t�tMis s_cal�� R r � � �� _ � ./ � � �4 40° 35' B" N� _ , i •� I � � I � �, I + I 40° 35 8" N 4911ti 491130 491140 4911W 491160 491170 49118� � 3 F vi � Map Scale: 1:432 if printed on A porbait (8.5" x il") sheet. � ° N Meters ° � 0 5 10 20 30 � n Feet ■1 0 20 40 80 120 N Map projecli�on: Web Mercator Comercoordinates: WGS84 Edge tics: UlM Zone 13N WGS84 Usb� Natural Resources Web Soil Survey 8/25/2020 � Conservation Service National Cooperative Soil Survey Page 1 of 4 Hydrologic Soil Group—Larimer County Area, Colorado (1516 W. Oak St.) MAPLEGEND Area of Interest (A01) Area of Interest (AOI) Soils Soil Rating Polygons � A Q A/D 0 B � B/D Q C 0 C/D � D 0 Not rated or not availabie Soil Rating Lines . � A o � � C/D � D � Not rated or not availabie Water Features Streams and Canais Transportation � Rails �..i Interstate Highways US Routes Major Roads Local Roads Background � Aeriai Photography .�.i A/D ..� B �r B/D . . C . r C/D .�.♦ D .. Not rated or not availabie Soil Rating Points o A 0 A/D ■ B � B/D MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Larimer County Area, Colorado Survey Area Data: Version 15, Jun 9, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Aug 11, 2018—Aug 12, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. USbn Natural Resources Web Soil Survey 8/25/2020 � Conservation Service National Cooperative Soil Suroey Page 2 of 4 Hydrologic Soil Group—Larimer County Area, Colorado Hydrologic Soil Group Map unit symbol 35 Map unit name Fort Collins loam, 0 to 3 C percent slopes Totals for Area of Interest Description Rating 1516 W. Oak St. Acres in AOI Percent of AOI 0.3 100.0% 0.3 100.0% Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff.� None Specified USDn Natural Resources Web Soil Survey 8/25/2020 � Conservation Service National Cooperative Soil Survey Page 3 of 4 Hydrologic Soil Group—Larimer County Area, Colorado Tie-break Rule: Higher 1516 W. Oak St. USbn Natural Resources Web Soil Survey 8/25/2020 � Conservation Service National Cooperative Soil Survey Page 4 of 4 ��c` �\ � �'�E,�"'� ��' � 1�4�� ,- _ � I I ' �� \I � ; � �� , --�� M, � .� ;,� ��, i—�,�s � � � ;,�� ,�, � �„ � �aaaTM�=� � �'� �I �i �� _ � � `� ��aTM�' � � �I % I� �a �, ;� � � �. ; y,�;, � � 1 � � , � ' -��. , � �, o � � —� �� , �� ' " �� x �A I � i �.o aE^" „�� , � �„o �, �� ' I' �`� I � � � � o �� i � � . :r i ,%\ � �� `.� " ��i 1 � � ' ... � o�o� � . � �, � � � - - � ` , � ,� � '� �-�� ° � � � � �� . �, ,— — i � � � � I I l� ---H' --- E,,ro� ��7� � � `�ro E �wo,�, _ _ �-r._ .. — — — f (.o a ncMo�o�cv i � ' , ,�, '� . — � -�` - m�:below -- - - � � ��Cd��bebreyoudlg. WOAVS'�R��EI � ,.�.,,. ... �„r HI$TORIC ! . . . . \� �., _��i v u��s�s� 'I �x voo.c�Pu+ �__— __ 0 .a DEVE'_OP=D ; � � �,�� ,, , . �. 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Oak Street DEVELOPED IMPERVIOUS AREA CALCULATION Design Engineer: J.Claeys Design Firm: Highland Development Services Project Number: Date: DESIGN CRITERIA: October 7, 2020 Fort Collins Amendments to the Urban Drainage and Flood Control District Criteria Manual BASINS: % Impervious values from Table RO-11 in the Fort Collins Amendments to the Urban Drainage and Flood Control District Criteria Manual Runoff Coefficients and Frequency Adjustment Factors for City of Fort Collins - Storm Water Criteria Manual Land Use � Runoff Impervious Coefficient C Paved 100% 0.95 Roof 90% 0.95 Walks 90% 0.95 Gravel/Pavers 40% 0.50 Lawns (Heavy, Z-7% Slope) 0% 0.25 Frequency Return qdjustment Period Factor (C ) 2-year to 1.00 10- ear 100-year 1.25 Sub-basin ^total Atotal Apaved Aroof Awalk Agrevel/pavers Alawn Weighted % COMPOSITE Designation (sq feet) (acres) (sq feet) (sq feet) (sq feet) (sq feet) (sq feet) Impervious CZ to Clo �ioo H1 2,555 0.059 0 682 404 0 1,469 38.3% 0.55 0.68 H2 6,948 0.160 0 1,078 445 0 5,425 19.7%a 0.40 0.50 H total 9,503 0.218 0 1,760 849 0 6,894 24.7% 0.44 0.55 D1 3,575 0.082 0 1,518 402 0 1,655 48.3°/a 0.63 0.78 D2 5,928 0.136 0 947 640 349 3,992 26.4% 0.45 0.57 D total 9,503 0.218 0 2,465 1,042 349 5,647 34.7% 0.52 0.65 1516 W. Oak - Rationai Calcs.xisx Page 1 of 2 Highland Development Services 1516 W. Oak Street DEVELOPED PEAK RUNOFF Design Engineer: D.Egger Design Firm: Highland Development Services Project Number: 20-1031-00 Date: October 7, 2020 DESIGN CRITERIA: Fort Collins Amendments to the Urban Drainage and Flood Control District Criteria Manual EQUATIONS: Q„ = n -yr peak discharge (cfs) Qn - CnInA C„ = n-yr runoff coefficient I„ = n -yr rainfall intensity (in/hr) A„ = Basin drainage area (ac) BASIN SUMMARY: 2-yr Peak Runoff 10-yr Peak Runoff 100-yr Peak Runoff Design Sub-basin Area (acres) Runoff Coeff Intensity � Runoff Coeff Intensiry 3 Runoff Coeff. latensity � Point t� (min) C�A) (acres) q (ft /s) t� (min) C(A) (acres) q (ft /s) t� (min) C�A) (acres) q (ft /s) (�z-io) (in/hrl I�z-iol lin/hrl (�ioo) (i�/hr� Hi HI 0.059 5.00 �.55 0.03 2.85 0.09 5.00 0.55 0.03 4.87 0.16 5.00 0.68 0.04 9.95 0.40 H2 H2 O.160 5.00 0.40 0.06 2.85 0.18 5.00 0.40 0.06 4.87 031 5.00 0.50 0.08 9.95 0.80 D1 Ol 0.082 5.00 0.63 0.05 2.85 0.15 5.00 0.63 0.05 4.87 015 5.00 0.78 0.06 9.95 0.64 D2 D2 0.136 5.00 0.45 0.06 2.85 0.18 5.00 0.45 0.06 4.87 0.30 5.00 0.57 0.08 9.95 0.77 1516 W. 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