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Home My WebLink AboutDrainage Reports - 09/18/1990��/.�L �E�D.�'- 9/i8190 � � l � l � l � l l ROGERS PARK DRAINAGE REPORT REsouRCE consu�TanTs inc � ... � � � ROGERS PARK DRAINAGE REPORT Submitted to City of Fort Collins Paul R. . bv Resource Consultants, Inc. 402 West Mountain Avenue P. O. Box Q Fort Collins, C� 80522 September 1990 �- Ref: 1526 1 1 ' ' 1 1 ' ROGERS PARK DRAINAGE REPORT This report presents the results of a drainage study conducted for Rogers Park Subdivision, Fort Collins, Colorado. Rogers Park is an 8.65 acre parcel of land located at 2518 West Mulberry Street and is being developed by the City of Fort Collins Park Planning and Development Division into a neighborhood park. This report is divided into three sections: existing conditions drainage, proposed drainage plan, and summary. The Appendix contains calculations to support the drainage structure sizing. Existing Drainage Conditions The park site is surrounded by subdivisions along the east and south boundaries ' of the park. Valley Hi Subdivision is located along the eastern boundary and the North Forty Subdivision is located along the southern boundary (see Figure 1). Three streets from these subdivisions - West Laurel Street, Pear Street, and Rocky Road dead-end at ' the park boundary. West Laurel and Mulberry Streets are the only streets that currently receive any drainage water from the park. The land adjacent to the west and north of the park is made up of unplatted rural residential parcels. ' ' ' ' ' 1 ' ' ' The overall existing drainage in the area is from the west to the east. There is a natural ridge along the middle of the park extending from the west side to the east side that directs the drainage flow to the southeast and northeast. An existing irrigation ditch follows this ridge across the park. The irrigation ditch provides irrigation water for two property owners adjacent to the northwestern edge of the park and other water users east of the park. From the park site the irrigation ditch proceeds in an easterly direction through the subdivisions east of the park to Taft Hill Road, where it crosses under the street and continues for approximately 600 feet, terminating at the last water user. The southeast drainage basins (8S, 9S, lOS) drain toward West Laurel Street and receive off-site dra.inage from North Forty Subdivision (9S) and the unplatted land west of the park (8S). The northeast drainage Basins (3S, SS, 6S, 7S) drain toward three separate locations. Basin SS collects off-site drainage from the unplatted land adjacent to the park (4S) and Locust Grove 3rd Subdivision (1S), and conveys it along with local drainage to the east along Mulberry Street. Basin 4S receives park drainage from the western portion of the park (3S) and from an additional unplatted drai.nage area west of the park (2S), which is diverted into the basin by an existing irrigation ditch lateral. Drainage from Basin 6S ponds in a natural low area with no outlet at the northeast corner of the park. Basin 7S currently drains to the back of the houses in the Valley Hi Subdivision. �Esou�cE consu�TanTs inc � ,00z =„� Hlaory � � , � � ` 1 � � � � \ 0 ' 111; l�// � � ► ��: � . � �� \ \ �\ �� 0 SN011�3d10 a001� 30VNIVdQ f 301AIU NISMQ — N01111�I�IlN3Ul NISVB NZ 1NIOd NOIlda1N3�N0� O : pua6a� _� 060G / ' h � � � J � J Q � � J � 3 uo�s��IPq�S � IIe .O �--� V ,, /. r ' i � � , , �� , s:� � � NISb'8 3JdNlb'�a SNOIlICJNO� 03d0��/1�0 : z aan6i� . -o�o� � v U • N `�__---, �_.� YS EI37A1 �� 060f " - `--�_� ,\ -- � ��. A: y ' � 4 J m Q Q � V J , � O 3 � ' , - -- -� �� (1, J � � � � xs�r3d.�► � - - � ______��-� - � C �+ . �J. •� _ � • O � � ZN ' 'OEI �f 90 � � /� O � v � oer ��ve� ix O.�_1� �� fA � �y O'� �l -� --- - -- _�. �..�s.-.�--�� _ N� 3sino� --� �-- !$!�lP4�S P�E Oenoa �o� � - c � . �,_ �do 3nod lsn�o� �-� � a � � Q � � � � � � � W. o � i� � / / � � 1 - -�� _ - - - t -- _ __ _ ._ - -,_ _ _ _ — — -- �` _ . _ ._ _, _ --- ---- - - -- ~-�-- � �._� �■ � � �� c i 1 h � � � , . i I � � ' ' Peak runoff flowrates, summarized in Table 1, were computed for the existing conditions drainage basins for the 2- and 100-year storm events. In order to fully evaluate drainage requirements of Mulberry Street, peak runoff flowrates were also tcomputed for the basins north of the park. � Pro�,osed Drainage Conditions The proposed drainage plan is shown on Figures 2 and 3. Figure 3(located in � the pocket), is a detailed drawing of the park site drainage and grading plan. The northern portion of the site - Basins D, E, and F, will drain to the northeast. Off-site drainage from Basins A, B, C, and local drainage from Basin D will be conveyed to the � curb inlet located on the west side of the entrance street to the park. Basin E, drains the east half of the parking lot and entrance street, and the majority of the drainage , from the south half of Mulberry, Street. It will then be conveyed to the east in the � Mulberry Street gutter toward Tyler Street where it will be intercepted in a curb inlet. Drainage from Basin F will be collected in an area inlet and conveyed to the storm � sewer in Mulberry Street. An underground 4" perforated drain will be connected to the area irilet to drain the playground area. The drainage flowrate from this drain will be very small compared to the peak flowrate for this basin and should not effect the storm � drain capacity. Drainage water that currently flows off the park site along the east '� property line into Valley Hi Subdivision will be diverted to the north into the natural ✓ low area. � The majority of the southern portion of the park, Basins J and L, will drain to: West Laurel Street. Off-site drainage from Basins H, I, and K will flow into these � basins and will also be conveyed to West Laurel Street. Most of the drainage from the � West Laurel/Pear Street parking lot will flow toward West Laurel Street. The remaining drainage, Basin M, will flow to the south in Pear Street. Drainage from West � Laurel Street flows to the east into Tyler Street, which then flows to Mulberry Street and into the same curb inlet as Basin E. �, As part of the park project, the majority of the existing irrigation ditch will be placed in a pipeline. The existing ditch has an approximate capacity of between 4 to 6 ' cfs. The owners of the ditch requested a 12" pipe be installed: The 12" pipe will have a capaciry of 5 cfs. A portion of the ditch will remain open in a natural area of the park. ,� The drauiage from a portion of the natural area, Basm G, will drain into the u�ngation t ditch. Approximately the same amount of area draining into the ditch before development of the park will drain into it under this plan. t Peak runoff flowrates were calculated for the proposed drainage plan for the 2- year and 100-year storm events and are summarized in Table 2. Both West Laurel Street and Pear Street show an increase in the peak flowrates due to this proposed ' development. Pear Street will have an increase in the 2-year storm of 0.1 cfs and 0.2 cfs in the 100-year storm. Neither of these increases is expected to sig�aificantly effect the ' 3 RESOURCE COnSUITANTS InC � � ONCEN. C.ompoute POQ�I'I' HASiNS ARFA C (ac) I 13 7.19 0.5 2 2S 0.8a 0.2 3 35 0.29 0.20 4 45 8.64 0.2 4 ?3,33,45 9.74 0.20 4 1&-43 16.93 033 S 53 0.11 0.95 5 1S-SS 17.W 0.33 6 63 3.08 0.2 7 73 0.91 0.2 a ss t.ia o.2 9 93 0.5 0.2 10 10.4 4.15 0.2 l0 93.A4.1QS 5.83 0.2 11 1N 0.90 0.32 12 2N 5.01 0.24 !2 IN,2N 5.91 0.25 13 3N 3.09 0.?3 13 IN,1N.3N 9.00 0.24 14 iS-53 � 26.Od 0.3 1N-3N TABLE 1: ROGERS PARK DRAINAGE CALCULATIONS RATIONAL METHOD EXISTING CONDITIONS 2-YEAR STORM EVENT TDv[E OF CONCFNiRATION OVERLAND GUTTEP Cf CCt LFNGTH SLOPE T LENC3TH VII.. (ft) % (min) (R) (fPq 1 0.50 70 2.9 6.6 940 2 1 0.20 360 1.7 26.8 1 0.2D ?SO 1.2 23.0 1 0.20 500 1.6 32.2 300 1 1 0.20 500 1.6 32.2 350 1 1 033 322 350 1 1 0.93 14 2 0.3 330 2 I 033 32.2 680 t.5 1 0.20 500 1.6 322 1 0.20 d00 1.6 28.8 I 0.20 350 1.7 Z6.4 1 0.20 100 3 11.7 1 0.20 500 1.6 32.2 200 1 1 0.20 500 1.6 32.2 530 1 1 032 300 2.3 19.1 1 0.24 420 2.9 23.1 1 O.1S 19.2 7U0 2 1 0.27 420 2.6 24.2 1 0.24 19.1 1030 2 1 0.30 32.2 EXISTII�iG CONDITIONS 100-YEAR STORM EVENT 'iIIo[E OP CONCFNCRAT[ON ONCFN. Compo�ite OVERLiND GU'ITER POINT BASIId3 ARFA C Cf CCf LFNGTH SLOPE T LFNC}TH vcl. (ac) (8) % (min) (ft) (fP�) 1 13 7.19 0.50 1.25 O.b3 70 29 5.2 440 3 2 2S 0.88 0.20 1.15 0.13 360 1.7 ?3.3 3 33 0.29 0.2D I.ZS 0.13 250 1.2 27.7 4 43 8.64 0.20 1.13 O.1S S00 1.6 30.4 300 2 4 2S,3S.43 9.74 0.20 1.13 0.?S 500 1.6 30.4 350 2 4 1S-1.R [6.93 0.33 I.1S 0.41 30.4 350 2 5 SS 0.11 0.95 I.1S 1.00 14 2 0.6 330 3 5 IS-SS 17.04 033 1.25 0.41 30.4 680 2 6 6S 3.Oi 0.20 1.25 O.ZS 500 i.b 30.4 7 7S 0.91 0.20 1.13 0.25 d00 1.6 27.2 S 8S 1.18 0.20 1.15 O.ZS 350 1.7 24.9 9 93 0.5 0.20 1.15 0.25 l0p 3 11.0 10 10.S 4.15 0.20 1.15 0.25 500 1.6 30.4 200 2 10 83,93,103 5.83 0.20 1.25 0.25 500 1.6 30.4 530 2 11 !N 0.90 0.32 1.13 0.40 300 2.3 17.2 12 2N S.OI 0.24 1.25 0.30 420 2.9 21.5 12 IN,2N 5.91 0.25 1.15 0.32 1'f.2 700 3 17 3N 3.09 0.73 1.15 0.29 420 2.6 ?Z.6 l3 1N,2N,3N 9.00 0.24 1.25 0.31 17.2 l030 3 14 15-53 dc 26.04 0.30 1.?S 0.38 30,4 1N-3N T iin) i.a 0.0 5.0 5.8 S.S z.a 7.6 3.3 8.8 0 0 5.8 0 8.6 7.6 T iia) 5.2 0.0 2S 29 29 1.8 5.7 1.7 4.4 0 0 3.9 0 5.7 5.7 Tc nin) ia.o Z1.0 25.0 37.0 38.0 38.0 4.0 40.0 32.0 29.0 26.0 12.0 36.0 4L.0 19.0 �3.0 ?S.0 24.0 28.0 40.0 I ✓hr) z. i� L.55 1.63 1.28 1.26 1.26 3.48 1.21 1.4 1.49 1.62 2.32 1.3 L L9 1.80 1.70 1.63 1.67 1.b0 1.21 Tc I ain/ (in/hrl 10.0 7.13 u.o a.62 24.0 4.71 33.0 3.94 33.0 3.91 33.0 3.9� 20 10.00 36.0 3.73 30.0 4.18 Z1.0 4.42 75.0 4.62 11.0 6.90 320 4.01 35.0 3.80 17.0 5.65 21.0 5.07 21.0 5.07 23A 5.08 73.0 S.OE 36.0 3.73 PE�SC Q (cfa) 7.8 0.3 0.1 2.2 2.5 7.0 0.4 6.8 0.9 0.3 0.4 0.2 1.1 L4 0.5 2.0 2.4 1.2 3.5 9.5 PEAK 321 i.o 03 31.0 9.6 27.5 1.3 26.2 3.2 1.0 1.4 0.9 4.2 5.5 2.0 7.6 9.4 4.5 14.0 36.4 REsouRCE consu�TanTs inc �� ^ J� � �i/ i � �� 1 � / � ' � � � ,, � ' r �. \ �� , � 1N , ' ��_ - � C �J \ . � - ,: . T � - � 1 I I i$ J . I � I ' W I � `, , BERKEI£Y C/R. 0 � �, 1 �o � �� ', �� \ GR£�ENTREE C/R /FF C/R. i � � O i '� � � � . O � 0 e h � � � „o — i � \ � i � v W h O � � � J � m � i GERS RK DS NOR H ORT h sue i vi ioN e 2 � a > V O � i ,; � � �.- � � , � t t I , , � _ CT. ORCHdRD PL. \ / ��GG -- - Ji�G � V �'� 2 N 4 3 �--� � �_ � �� J O . 8 6� . 2 �S 2 S�. "'� _ / -- W. MULBERRY ST. � -�� MYRTLE CT. VALLEjY CT. W.I LAUREG ST. � , � � 0 0 � ��`. / h W > �I J C- C G p 0 h 5 r 0 Z � N � Z Z o � U a Q � z v � O � W � aF— � O z � z � � n � W 2 Z Z C Z (n N a m � m m c �ON � � O V / � O � � � � Z Q O m . . �„! � �— z � a �, �-- z � �Q � x ac i�. w o �� w N � � TABLE 2: ROGERS PARK DRAINAGE CALCULATIONS RATIONAL METHOD DEVELOPED CONDTTIONS 2-YEAR STORM EVENT TAdE OF CONCFNTRATION ONCFN. COMP031TE OVERLAND GUTTIIt POINT BASINS AREA C Cf CCf LFNGTH SLOPE T LFNCi'fH VEL. (ac) (ft) 9L (min) (ft) (fps) 1 A 7.19 0.50 1 0.50 70 2.90 6.6 9�0 2 2 B 8.64 0.20 1 0.20 500 1.60 32.2 300 1 2 A,B 15.83 0.33 1 0.33 32.2 300 I 3 C 0.80 0.20 1 0.20 360 1.70 26.8 4 D 1.07 0.49 1 0.49 20 1.50 4.5 720 2 4 C,D 1.87 038 1 038 26.8 TIO 2 4 A,H,C,D 17.70 0.33 1 033 500 1.60 27.5 330 1.1 5 E 0.75 0.93 1 0.93 20 1.00 1.4 720 1.1 6 P 1.79 0.30 l 0.30 300 1.70 21.7 7 C} 0.12 0.25 1 O.TS 30 1.70 �.3 S H 0.90 0.20 1 0.20 350 1.'IO 26.4 9 1 0.23 0.20 1 0.20 70 2.00 11.2 10 J 0.56 0.48 1 0.48 120 1.70 10.6 100 1.5 10 I,J 0.79 0.40 1 0.40 200 1.70 15.5 100 1.5 11 K 0.52 0.20 1 0.20 100 6.00 9.3 12 L 3.60 032 1 0.32 30 2.00 6.3 820 1 12 H- L 5.81 0.30 1 0.30 � 26.4 820 1 13 M 0.02 0.80 1 0.90 10 2.00 1.4 �NCFN. Compcnite POINT HASIN3 AREA C c•�� 1 A 7.19 0.50 2 B 8.64 0.20 2 A,B 15.83 0.33 3 C 0.80 0.20 d D 1.07 0.49 4 C,D 1.87 0.38 4 A,B,C,D 17.70 0.34 5 E 0.75 0.93 6 F 1.79 0.30 � c� o.i2 o.0 8 H 0.90 0.20 9 I 0.23 0.2D 10 J 0.56 0.48 10 I.l 0.79 0.40 11 K 0.52 0.20 12 L 3.60 0.32 12 H- L 5.81 0.30 13 M 0.02 0.80 ROGERS PARK DRAINAGE CALCULATIONS RATIONAL METHOD DEVELOPED CONDITIONS 100-YEAR STORM EVENT Cf i.-u 1.25 1.25 i.0 i.0 i.0 i.0 i.0 1.?S i.0 i.0 i.0 1.?S 1.25 1.T5 1.?S i.0 1.?S TIME OF CONCENTRATION OVERLAND dU?TER CCf LENGTH SLOPE T LFNC)?H VEL. 1 (ft) % (min) (ft) (fP�) 0.63 70 2.90 5.2 9d0 3 o.0 soo i.6o 3o.a soo z 0.41 30.4 300 2 o.as wo i.�o as.3 0.61 20 1.50 3.6 720 3 0.48 25.3 720 3 0.43 500 1.60 2t.1 330 2 i.ao zo i.00 o.s �zo 2 038 300 1.70 19.7 0.31 30 I.70 6.8 o.as 3so i.�o u.9 0.?S 70 2.00 10.6 0.60 120 1.70 8.6 100 2.5 0.50 200 1.�0 133 100 2.5 0.25 100 6.00 8.7 0.40 30 2.00 S.'7 820 2.5 o.sa u.9 aso z.3 1.00 10 2.00 0.5 � PFAK C Tc I Q in) (min) (inlhr) (cfs) 7.8 14.0 2.17 7.8 5.0 37.0 1.28 2.2 5.0 37.0 1.28 6.7 27.0 1.55 0.2 6.0 10.0 2.52 1.3 6.0 33.0 138 1.0 5.0 33.0 1.38 8.1 10.9 12.0 2.32 1.6 22.0 1.66 0.9 ?.0 2.89 0.1 26.0 1.60 03 11.0 2.40 0.1 1.1 12.0 2.32 0.6 1.1 17.0 2.00 0.6 9.0 2.60 0.3 l3.? 20.0 I.ffi 2.1 13.7 40.0 1.21 2.1 1.0 4.50 0.1 T �i s.z z.s 2.5 4.0 4.0 2.8 6.0 0.7 0.7 5.5 5.9 Tc I nin� c�� 10.0 7.15 33.0 3.94 33.0 3.9� u.o a.si 8.0 7.40 29.0 4.32 27.0 4.42 7.0 7.50 20.0 5.18 7.0 7.50 zs.o a.ai 11.0 6.90 9.0 T.30 14.0 6.23 9.0 7.30 11.0 6.90 31.0 4.11 1.0 10.00 PEAK Q (cfa) 32.1 8.5 TS.7 i.o 4.8 3.8 33.2 5.6 3.5 0.3 i.i 0.4 2.5 2.5 0.9 9.9 9.0 0.2 RESouRCE consu�TanTs inc � � L � � � 1 existing drainage of this street. West Laurel Street will receive an additiona10.7 cfs in the 2-year storm and 3.5 cfs in the 100-year storm. Additional analysis was conducted to determine if the increase in flowrates significantly effected the existing conditions of the street. This ana�sis is included in the Appendix. The peak flowrate from the park site onto West Laurel Street is 2.1 cfs. The allowable street gutter capacity for this street is 6.4 cfs, which is greater than the peak flowrate from the park site. The d'rainage from West Laurel Street flows to Tyler Street, which then flows to West Mulberry Street. The peak flowrate at the northwest comer of the intersection of West Laurel and Tyler Street is 5.07 cfs for the pre-developed park site and 5.8b cfs for the developed park site. These peak flowrates are lower than the local runoff of 6.0 cfs from the Valley Hi Subdivision which comes at a shorter duration time than the park site. The allowable street gutter capacity of Tyler Street for the 2-year storm is 5.01 cfs. According to City of Fort Collins Storm Drainage Design Criteria, a storm drainage system shall begin when the allowable gutter flow in the street is exceeded. At this location on Tyler Street, a storm drain system is required for the existing and developed conditions, however, one has not been constructed. An analysis was made to determine if the increased flowrate from the park site caused a significant increase in the depth of flow in the street. The analysis concluded that for the 2-year storm event, the water depth would increase 3/16 of an inch, and for the 100-year storm event it would increase 13/16 of an inch. For the 100-year storm, the maximum encroachment for Tyler Street is not exceeded since depth of flow above the crown of the road is 0.08 feet. Since the increase in depth of flow in the gutter is not significantly higher than the existing gutter flow depth and since the 100-year allowable encroachment is not exceeded with the developed park site, it is our opinion that the effort of the park development in this area is insignificant. Therefore, a variance is requested to not construct the storm drain in Tyler Street. Mulberry Street is classified as an Arterial Street and has a maximum street runoff encroachment of no curb overtopping, and flow spread must leave at least one- half of the roadway free of water in either direction for the 2-yeaz storm. For this site, the allowable gutter flow is 5.3 cfs. Using existing conditions, a storm drainage system is required at the western edge of the park since the flowrate is 7.0 cfs. There is an existing storm drain near the eastem edge of the development. It is a 24-inch RCP and has a full pipe capacity of 21.6 cfs. In a meeting with Storm Drainage personnel, it was decided to extend the 24-inch storm drain to the western edge of the park along Mulberry Street for future development to the west. ✓ �'� The extension of the 24-inch storm drain will be constructed at a slope of 0.0056 ' ft./ft., and will have a full pipe capacity of 1b.9 cfs. Two laterals will be constructed off of the main to drain the northern portion of the park site. The east lateral will be ' constructed at the natural low area at the northeastem corner of the park. The lateral will be a 15" RCP and the inlet will be a standard area inlet with 1.6 square feet open area. Both the pipe and inlet are sized to carry the peak design 2-year storm flow ' without detention. For the 100-year storm, detention is also not required, assuming the storm drain in Mulberry can facilitate the flowrate. An emergency spillway will be ' ' �EsouRCE conSu�TAnrs inc � ! , constructed at the northeast corner of the park to direct excess drainage water toward Mulberry Street. The other lateral will be constructed at the west side of the intersection of the Rogers Park entrance street and Mulberry Street. It will be an 18- r inch pipe, and the curb inlet will be a CDOH Type R with a 10-foot width to carry a '� peak flowrate of 8.1 cfs. The curb inlet is located at the south curb return, which � provides a more e�cient sump condition for the inlet. The grading of the access street is from south to north at 0.9% slope and the lowest point of the access street along the ` crown is at Mulberry Street. Any excess drainage water that cannot be drained by the �z � curb inlet will overflow the crown of the street at this low point and continue to flow —�' ' east along Mulberry Street. Due to utility conflicts in the street, the water main will � have to be relocated deeper to accommodate the lateral pipe. The combined 2-year � flowrate of the two laterals is 9.0 cfs, which is less than the full pipe capacity of the 24- inch storm drain. The Appendix contains calculations to support the drainage structure si2ing. � � . umm � Existin�Draina�e � The overall existing drainage in the area is from west to east. There is a natural � ridge along the middle of the park extending from the west side to the east which directs the drainage flow to the southeast and northeast. An existi.ng irrigation ditch is '� located along this ridge and provides irrigation water to users adjacent and east of the park. The southeast drainage basin drains toward West Laurel Street and receives off- site drai.nage from the west. The peak 2-year flowrate at the southeast boundary of the park site at West Laurel Street is 1.4 cfs and 5.5 cfs for the 100-year event. The '� northern portion of the park drains to three separate locations: 1) Mulberry Street, 2) a � natural low area at the northeast corner of the park, and 3) toward the back of a house � in the Valley Hi Subdivision. The Mulberry Street basin collects off-site drainage from the unplatted area adjacent to the park and Locust Grove 3rd Subdivision. The peak 2- ,� year flowrate leaving the park site along Mulberry Street is 6.8 cfs and 26.2 cfs for the ' 100-year event. The peak 2-year flowrate to the low area is 0.9 cfs and 3.2 cfs for the 100-year event. The peak 2-year flowrate draining off the park site toward Valley Hi Subdivision is 0.3 cfs and 1.0 cfs for the 100-year event. This is eliminated under the � ` proposed drainage plan. ' Proposed Draina� The proposed drainage plan basically follows the existing drainage pattems. ' The northern portion of the site will drain to the northeast and the southern portion will drain to the southeast. The existi.ng storm drain in Mulberry Street east of the park site will be extended to the western edge of the park. Two storm drai.n laterals will be ' constructed off of the main. The east lateral will drain the natural low area at the northeast comer of the site. An emergency spillway will be constructed at the northeast � 8 R�SouRCE consu�TAnTs inc � � � r � ' ' ' � � r � � � ' ' ' ' ' ' � corner of the park to direct excess drainage from the natural low area to Mulberry Street. The west lateral will be constructed at the northwest comer of Mulberry Street and the access street to the park. It will collect drainage from a portion of the pazk and off-site drainage to the west of the park. The curb inlet is located at the south curb return, which provides a more efficient sump condition for the inlet. The grading of the access street is from south to north at 0.9% slope and the lowest point of the access street along the crown is at Mulberry Street. Any excess drainage water that cannot be drained by the curb inlet will overflow the crown of the street at this low point and continue to flow east along Mulberry Street. Both laterals are sized to carry the 2-yeaz peak flowrate. The extended storm drain will have a capacity of 16.9 cfs. Drainage water along Mulberry Street will not flow onto the site until the depth of water in Mulberry Street overtops the curb. When this occurs, the water would flow into the natural low area and back to Mulberry Street via the emergency spillway at the northeast comer of the site. The drainage flow in Mulberry Street at the eastern edge of the park will be significantly reduced by the construction of the curb inlet at the western edge of the park. The peak 2-year flowrate leaving the site along Mulberry Street will be 1.4 cfs, a reduction of 5.4 cfs. Drainage water that currently flows off the park site along the east properry line into Valley Hi Subdivision will be diverted to the north into the natural low area. The majority of the southern portion of the park will drain to West Laurel Street. A small portion will drain into Pear Street and into the irrigation ditch. As part of the park development plan, the majority of the imgation ditch will be replaced with a pipeline. Approximately the same amount of area draining into the ditch before development of the park will drain into it under proposed plan. Both West Laurel Street and Pear Street will show an increase in peak flowrates due to this development. Pear Street will have an increase in peak flowrate for the 2-year event of 0.1 cfs and 0.2 cfs in the 100-year event. Neither of these increases is expected to significantly effect the existi.ng drainage in this street. West Laurel Street will have an increase in peak flowrate at the park boundary for the 2-year event of 0.7 cfs and 3.5 cfs for the 100-year event. The allowable gutter flow in West Laurel Street is not exceeded with the increased peak flowrate. However, the Tyler Street allowable gutter flow is exceeded with the existing condition drainage flowrates. Using the cit}�s drainage criteria a storm drain should have been constructed for existing conditions, however, it was not. At the northeast comer of the intersection of Tyler Street and West Laurel Street, the peak flowrate for the 2-year event is 5.01 cfs for the pre-developed park site and 5.86 cfs for the developed park site. Both of these peak flowrates are less than the peak flowrate from the local drainage of the Valley Hi Subdivision which is 6.0 cfs for the 2-year event. The increase in depth of water in the gutter from the pre-developed park site peak flowrate to the developed park site for the 2-year event is .02 feet, and .07 feet for the 100-year event. In the 100-year event, the maximum encroachment for the street is not exceeded with the increased flowrate from the park site since the depth of flow in 9 REsouRCE consu�TanTs inc � the street is only .08 feet inches above the crown of the street and the criteria allows up to 6 inches over crown. Since the increase in depth of flow in the gutter is not significantly higher than the existing gutter flow depth and since the 100-year allowable encroachment is not exceeded with the developed park site, it is our opinion that the effect of park development in this area is insignificant. Therefore, a variance is requested to not �� construct the storm drain in Tyler Street. lo RESOURCE COnSUITAnTS InC APPENDIX r ' �� a h 7 RES�URCE �y ��tC S CCt�1__.�f COhSULTAhTS, chkd. by ��%�-� dat� �;':=%,��' � job no. l5Z(o ' �nC. subject ,rs � � �rca. `� � C. 1 , . .:� < < Fort Collins,.Colorado (i ' ' 1 1 � ' 1 � 1 � �� 1 z� f ! �C �� (.�,, �� ►i�vt�� '�'-�� ..' Gt a �D = �." bo h =000t3 C � �wQ.A P�;.� ��Q.ow d, S l� - 6_�� Q - � �� Q�3 S'�z n �.��b -� �z�L a�3 ��2 Q=-- � .0�3 4 � Q = aa�. z2 (.00909) _ Q = 0�(o,2Z �-oo��%L _ v= s�� 2 �'� �� -(«,� ��.� d� I�.�� , �a�, zz s�i _ z I,� c�.�� l�a�.�c 5� � 1 � . � c,�5 �a��sc'o�r+ c,�� , l� (� RC-'P � V 1= oe o 1'3 ,_ 5= oo a� 3 1 Q = ►,48� �. �i,�)2 ��,-� �3 S ��Z = 64 ��g 5'�z o- - �. . b- �3�.._. �" . _ __ t .. _ ' � _ �4 �. �4 � • c�o 3 �� _ ��5� �� ° _ ,� = 3� " _ �a�8 �'fs i ��'�' 1 1 � � Q►g" Rc� � t�-o� 0�3 , 5= o.00s Q= 1•'� 86 r�(j,�\Z I, 5l�i S'�z ;, l OS . O�{ S/z .0�3 4� � �4I C� ' �cx.o�} (. co�,)� _ 'l, y3 c�s � _ `�,2Z ��, � � � RE50URCE by �A� �� date � O sheet � of� consu�TanTs, chkd. by Gz;l.date '` :� �'� job no. y2 �o ' �nC. subject �c� �.��5 �'a,�.(t `�rQ.��nu'�c. �� c :�.� �� .�j:�t.� Fort Coll�ns, Colorado � r � 1 1 ' 1 � 3�.�.� C Q�- � C�,6 .�.C�-f � � � � IIo�zG�(� ..��i' .�Q�c,�e.� � ��or�.�er� ��a.,�4o�, �n� � CZo `�u.�( c,wiu.u�. o�cxoz.�aJ1-�lo w�.. �� `iYlc�' o�� -VUt.u� � �'}�r�.wc� rx�.�� p„ �(,� � ✓'v�.c� i .st�1.c.Ucl.�in `�o �a.�-�'v�a,Kc.e �..^. a-dJ � . —� Max. a.�.Qa�� G��,�. (s.ve.l ��'�.A,1��. sf o � c�o ��'��o► — (t3.s jE.oZ) _ ��,�� --� C,�� ,�� ^�-�t' _ �oq� .�� C'�,-�-�v-�s � � � ��q �. 5 -2� ? 5—I D S+rNw� �µa; �-�O�rt G�.�-- I � �- �-t�� , s Qa> �o = �i�,5'�j — SC�� i3�Na�w�Q �'� � �} ^ � �� _ . �1 ��p/� _ �� ,5 '� Q� c�a / C1 �� = b-q3�� /F+ d� R��(� ��. _ -�i��-��.D ��. � 0.$5 �fi C�1�0 44- T� p�. � � • to' � � �� Q/� = O�a3 �c, as = e, �q ��/�r- �) � _ �o� �� G�"1� = I D� Z 5 (,1,4�2, � O� , � � ' RESOURCE COhSUl1'A�ITS, i{ic. Fort Collins, Colorado by �� date 5� 4� sheet 3 of % chkd. by�.,�_, ��l�.0 date �►�'� job no. I Szlo subject ��< ��.�C ��.ck�e �'�c� ius � l cg � � ,�(; d�,� — C, � �o � ' l�•P � w, ��c,�J(�.1 � � �.) �a� � �.t = �� oZ b) IQ f��Q �t a� c� 1� �,t�.-�- = SoaS� R� ' c� -�- 18" R.c. � w l� � w�.� G) �.-� �. �P I F�+� � N�c No. s, P�� s-zz Q ' ��"l C-�j � _ �, S �= l,z( I}� = l�z� C�►s� = 1,�3Z ��1a5�l2.�� -�� -�. �� -Loz� �,a�Qr.�s�. �w � � a L� C� = I o5�0� s`�Z S = .� Z I o5�0� ITI� _ � N� � l = �� , Z _ �os, cx� . � o , a�s7 c{owxs�ea.�._. GJ SC �-. �S ��. �scY�o� �� ) -�- ( , 0057 � 7 s, s� sc� 2 . �� o�' ��., i,�-- ��.�' � �� z�� -�n 1��4� ta �-a `�.�-- 50G � � � � �.c�,w� � u� � � � o C1�s e a.,�U��4 � RESOURCE by ��-��R K+�-�' date S q� sheet � of� COnSULTAI�TS, chkd. by '�- � date zv �a job no. 15Z� ' �nC, subject � Q r a.�. � v�z 'v�.2. a�c � art Fort Collins, Colorado � � � ��' _� i �iS,�N� � Qi = �� 9'� �y � �� 2 l Cl�.��,� �. G�:-f � � !(.oX �4 Gv�z"� - No, Iz I•�� `"h�.ct�. G c� c, o� �-:�� ax ,�5� `�,.�,;, G�,-,� E.o �.� Y�( Q e v,a,� �- 3 3 3`� 0��. �� = 1, Co sF a� �o�n�c c�-�`{'�- �.e.�'J ��#;c� �l,l � C� Gi. ��Z.�, q� � v `1�(�e.. F�� s— 3, Po S— I 1— C�o� ��.. G�a.�P �� S �a C e 5�-�. �,,. �r�.�..:� �d� �� G�.-�...� � C�,,� S�-Q, Q0. = . Q? �. �� o �z� �t� �-� = v$ _ . � _ . .Q ` �, �zs : o.�o_ ��sF � —t, � �-w►,. ��y 5-3 ,�o r�� = i� ��x, 0.2�. .J � � � �l C � � car� — 1 �,.. � o �.�f e,��c:o� �'� �. �,p.�a� .� r,vu.� s ��.c.� `� .��e ' c�- Q,Ss `#z�., �e� i,�G�. � � Q w � s�.� � tr� �,�- � � �. �-c� �� RESOURCE by � u'r ��t�►Z C� �., � date� �� l � sheet � of'7 consu�TanTs, chkd. by �^.s� date ^:�?c,la��ob no. s7�o �nC, subject Fort Collins, Colorado �� %� � r t %f� ! �`� v 1:..- � � �✓C�C� Q=�� Sc� J � c�r �� ie z �� Qa = QT =�o . �o QT = Qa = � � _ �, 3��c � .� ,� Q-,� � ,... _ n� �; � �a _ �� 73 c-� �1 �. ca s� �v-mr�.t. ., �- 3 � ��- o v�-�r � Y� - O- 3 I-�t � ��U � �UvL� -- ��=t Z, � � f- o � 3 � = SO�1Z . � ( � _ �I�:,� � � -�f � __ __ � — 3� � `� �� .. _ .. 3, �� {� ,Or�,�. �l�r.v � =� Q� � f ' �.c� z'� `f �y�a � nv�' .s�-G kC�. c ' , � � i� 1 I ' �� RESOURCE by �y'� �� date�a�_ sheet � ofi� consu�TanTs, chkd. by date job no. � SZCo �nc. � � 1 sub�ect Kc�e,�s I a.�< 1��.�ti�e ��:.�'��,,•�� Fort Collins, Colorado � ) o �-i �o�c.� G �t—� �c� � ,--,��,1�� C � �� 6 c.a� �`^�~^, �� 3.s �3.5 �� - a��.¢ � � � . . � aF._ rec =►as x.oz = e z3 3ii �_ �i + , z3 = o. �/O � (ti} C;�,- �� o� � ToTAL � � Q b Po�cQ w.� `i �z �^e.e.�'w i or;� -� �re�- (s�.� -tL..,,� T � Cw, o � �� Q b _ . � � -� � _ �z«,�� c�x 5w� _ /.oz _ - - - n = o0 o.u� �/ = 31Z5' S = �e�' SIeP.Q = (, ( g % = o0 o�(g � _ �.z3 �� I-o l �. P. µ, 3_� F� _ s. �. p_ c._ �- c_ �e � b — �. (o RESOURCE by �� date �� qa sheet�of� COhSULTAhTS, chkd. by date job no. f`��-� (�C• SUbj@Ct�vs �RYz.iC �rQ,Lv�G�±2 c..�lL�crc..l.tc..%=i�+�S Fort Collins, Colorado � � Q� Q0. �-�D QC �„ � _ �� - �2 � o � - %/.50 5 = o� nug � = D� 4Q Q�=3,9��5 (�a = 5.°l - ti.q - 3, o ��s Q � ao Q D �= IZ �=�50 s =o.�t� � = pe �4p — �Z= ��3 Qo= o,q ��s �� T = 3, 0 + 3 , � _ (�.. C� c.-�s QAl.�oc�Ag,s - Q� � 0.8 = 5. 3 e� � �'� � � �i� . `� -Z G.FC. SD1�CS_ � ta ��i+» cau�rior: o• o.�� (�� s� s�'� IOOOO �� VOMM(!! aatrneitM+ i■ ■AMMIMO ,IO 9000 �O�YUI• •�►�O►�I�fC �O Y�TC�I�I Ir 8000 �o*�or or LM�MN(� T000 � : is scc��oc.� a uoss e�ore .08 6000 ■crc�cwcc: N. �. a reacca■cs i+w. .O7 3000 �� 0, LW��OM u�� .06 4000 1- E%AMPIE ��t[ o�fN[o �iw[a� � ,QS �00 00 aivcr� s • o.oa �o + ' _' j N ea � .04 n • .o: � t/^ • ,:oo � 2000 �• o.:: V" z o � .�■o � o • :.o c.e _ _ — .03 _�=--- io' _----- �— Z s 2.0 I.O .80 .TO .60 �� .SO LL .40 Z 1�— 2 1000 -'- - 02 '^ 900 '' 2-� �1 - 800 = � _'- - _ � \ 600 " ' � � _ - ry,� z - " fn 500 � " 400 ~ W = OINSTRUCTIONS � � J .oi Qaoo � o� W � 1. COMNLC7 �II1 II�710 MITM S10�[ ISI Q .O� 7r � ��8 r�• 100 90 80 %� so 50 40 30 2� �. From BP •MO COMMICT D�SCM��OL (O1 M� = 03 � • OC►7M (71. TM[Si 71/O lIN{! YVS7 UI^ .oi Q .007 INT[�7[CT •T TUIIIIIN6 LIMt F0� V' corr�cic sowrio�. � o� V .006 t. ro� ew��or � � � .00S - , y-�M�/(0 CM�AM[l O �S 7MOr■ Uf( MOY06��M ,004 1��TM i � t Y (� a. . r; O .00a !. 70 o[TC�r�Mt J �,��...� a, �. r : . N a: j ►OA��ON 0/ CM�MM(L ��J M�VIM6 'A�D7M t: I�� ot*teris[ ov+� a ro� *on� o�fc�.�ot �� .002 LM�111( S(CTIOM O. �X(M Y7I NOY09��M �0 0[TL�Y��[ O� IM 7LCT10■ O f0� OC�7M � • � - (�) • TO O(7(IIYIN[ O�SCM�116[ ' �' IM COr�07�TC S[C7�0��- J a �r �� „«a. IMlt�VCiION � i : r ¢. .00� TO O�T�IM OISG��GC 1• I��w-� =�J. �[�t10M a �t •S]V�1LD � �� 0(��M J; 0�7�IM p f011 R ,�a.� ..�,a ., .�o o�.,. ,� �,�� a, . a, . a, Figure 4-1 NONOGRAPH FOR FLOW IN TRIANGULAR GUTTERS (From U.S. Dept. of Commerce, Bureau of Public Roads, 1965) 30 .20 H Z � a. � (n .10 W a' .oe W W .OT � N .06 I.i. 0 .�� .04 � U � .03 Q _ a .02 W 0 � MAY 1984 4-3 DESIGN CRITERIA � , RESOURCE by �" ' � �� 9 date � � �� sheet � of � � consu�TanTs, chkd. by date job no. � SZ� �nC. sub�ect Fort Collins, Colorado . �, . � , —r- , ^ � t t 1 `. .'� ! ��'t-ti� + }r� Y� � � Cc..`'�z�'/ti L ��_,�-v-�_ ;� � �_,` � � � � �: �5��h�. �iC.�.^..��-'� i �. � .�� w � c— ', �� f � _ � � , r � � � � . ,_ ... (.1 ._ . ... -- �._ _ '�� (J c.Lcc,.V ��o�s C c,� �� ' ' :._. .._. ... .... . . _,.r ... �. � =�,-��,�-�_ �;�'�;,. . __ _ _ f i.-_ -__ ___- __ . _ ____.�._ _ _ __ , _ 008 �, ��.,�.�. �. , o � �. _ - o � �� 10 �... — 0 e _ , _� .�, _. :_�__ _ , _ _ _ �__ _.�_ . ____ � _, � . ,_ , n �- ° � _ _ ._ _ _____._o � _ � : .._- ---- __ .________ . � . _ .� _ = c � � .c�.�� Y;� x � _�� . � � ,--_ _�__�� a�° �� _ _ '� _ � D `�'Z . -- l�.�P = 3� 8� ._ _ � � ' _ _ ._ _. ___.____.T _ _ - --.- -_____ � = T,!�SC� � /3 5'%z _ � � � � � - _. , = 1 � � 8 � � _ ►�� . �� o . �z - � o � . . � �� . � � o �� _ _ _ ��.. I �,E� -- -= (� . I c��r 5= �D� oZ - 3 �. �ov 5= 0, og � RESOURCE by�p �� date 7-C� sheet�of� consu�TanTs, chkd. by date job no. ��Z� �nC. subject Fort Collins, Colorado � —�-� � � v� r�� c�,�.a,� T� ��.��.e- �..�.iC�� f 1 Z � � . �4Y1 G� /'�y2.+ J � G 0'�'r2 � �r �8 /O �j �� %V�SC�b9'Yt �� Y'.-f-�cT1.J � � = I � �� 6 � �`�3 5'%z . r1 = �-g� � �p� Z Z � � ��_ �� '�3 �.O IO�) _ ��7 GT� t _ �}' ,. ! _ �� F 1% - � - 3'-= � �(.7 I - ��'� --��Q o j Z` r�, c�� U�� oc�-►�rs : d ��: `(�' `� �, -_ _ r�-1 l�w sc�.� T.._ ., 3 � �`� w� � „ �' � : . . S 1�-�j/�1j(� = . .�I �'r - � c� �; � = o oc� t � � • IJ _ L� � ;�_ �_� . �(/�f/ � = �-b�a ��s , RESOURCE b� �� 2-�...,,_ date ZS "�� sheet � of 2 Y consu�TanTs, chkd. by date job no. i SZ;o , �nC, subject F M u.� 1�,�' u � l� Fort Collins, Colorado ' �__ La�� -y�� v�r ' _ 9 1 ' ' ' �As�-�� Q� I�,o�z L= 0,50 T(A�t,,,2, �i1 l.(/1�i�i� j:� T�i/l�(l — O L9fiv � T�t,� '/ �'_ Ti�U �/ �-- � S��Q f r= l�j,�ik.. U q c�,�. '� C. /�{�!o � %- Z � , T- �Z,vH.... I T�, '- Z'rJ•� Nn�nn. ' =Z = � t (, `��i,,._ �_(� S�X i.�� oz� = 13� (� �� , z 1 � , �` _ � . ��s�6JS (.S-SS _.___. �5_ �os � � I�,�a<,�',_� � L`7,�o�ac. � C= 6 33 � 6��- = 5.� 3 o,c. l �. � o. Zo A � � l� = I�.oZ � C = .So rCc�Q a�.a- = 39 , 8�i . c o 3 _ � 8 �C� �. ��-��ti , . `'��,.. �i.ov►1. I�S -�-a __ (�.�.� S%J�' � �T� � eouc��,��. C��, � _ �o.o �.w.. ��,,..�1� � 1 �_ �c�O� �j =2�.; _ �� ..:_ T� =� ��-�,�.:_.�.. _ . P�-�. ��. —� (� �� T� � . c.� o �. � � _ �� .o q�.�.a� � �� = tzc� �= z� r� (a s� �1 � 1 � �. � — 1 � _ � • % w�. �- 4: ' � � � � � 1� �I , ' ' RESOURCE COI�SUL?ANTS, �I IC. Fort Collins, Colorado � by ��-��,,._ date S sheet Z of Z chkd. by , date job no. _ j JZ� r " � � 1�"l. � � � � � JT subject �``��,�;=�- �- !.�•_�u �.c� � a �, 4 L� o � T� = S'. ��:.... , �Z=►.o i �:N/�.... 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I 7 c, f��. � `P�k �� -fi� Q ,.� � Z � (��31 — II�� _ �.L��f� _ � \ � w soso� Figure 2: DEVELOPED CONDITIONS DRAINAGE BASIN � Legend: 4O CONCENTRATION POINT 2N BASIN IDENTIFICATION - BASIN DIVIDE �� DRAINA�E FLOOD DIRECTIONB ` � � � � � ��' ��= 2�0� RESOURCE by�C� ��t2 ,:. �, date Zo � sheet � ofi �� consu�TanTs, chkd. by date job no.�� hC. subject _�ra. �,,��G a S,nn'�r .�� ,�.h� c3� l�� i.�'.� Fort Collins, Colorado �� `�, n � ��-`T� �'V�Q.�� Gt. _ _ ��M��e,u�e.�.o� w�•� • . . . � �. _ � � ��-��.� _�� -�s . _ �.- _ �.� `� � - -. __�_ _. I- �� (`}- Q �I.c.� �7�Yv�. � S t�u. �a � � _ ' _ �� , (;0 �Z = ( � �- c.�s .. � ._;_� __ --- _. ,. _ ____. _ . _ _ ,, , . ,.Y,. �, i x__._ _ _ � ..►� _ _�_ _ ��C� 2 _ __ _ � � :�to�, �o� � 5�.=� a�- � �,.. 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Cc��-'%.�n � (� a C� c� , ' i 8� Cl sh �" � � RESOURCE by � s 4� �,�_ .-. date eet�o# � consu�TanTs, chkd. by date � job no. /SZ , � �, �i ; .�, �ri . subject ��L:�IG�'+�. �G--a�� C',r �ti�,�C �-::� Fort Collins, Colorado / %]� ' " - � � . �( � ,,,�i � � �, � ��h-LG(Li � � V U..0 '�-�5 � � �U°...�.1.,� � ' � � � �� l � -�� s �,� �,, c.,J . ��.�.� 5-��-� _ CO � 1C a �% T � I� TG = 3�,0 _ ____ ' _ Q,� = �� s �� _ i �.I�t� 1 _. __ __ _ _ _ v . ___�__ _ . _._ --- . . �'1� �: �� x C� C�.�� . � .w�'��, �L s� . . _ _ _ __. _ __� } � �� = 5,83 _ �-e.� - _ _--- . _ __ __ �____ _ . .. _ � Z _ 3s�.. _ _ _._._. __ '�3(�.:m�� >C - (�.5 �- . - - �_ _: . _. _ ._.._ _ _ __. �,L�;� ��.� � s � - _o • ZO _��n , � _ -,. 1� �.a�a.:.� �- 0•3� _ . � � - .�, - � m� c�.�a. _ _ ___.___:___ ._ _ . -- __. c�-� �C _.. _ S -- --�---+---�—�---�---�—. ____. ____ �_.--- --------- , , � � , . � • , T _ _; . _ __. ' .�.�,� , �. 3 5.0 - - ._. �. 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Fort Collins, Colorado by�� =��-I�''� ,- date � 2o q O sheet�of � 1 chkd. by�� dat� , job no. i�Z(� ' ' � i � �1l ` � �T subject � ;,.� �.;��v-�.,,,_ �� ;�.� � �?-� �„ C� _� -� ^ � l� � ' , '� I,�..�✓ �-i v�.0_�� `%�.,, � ,.;��, �W � �?c, c�..��rc � 1rt � i oc.�xk.� S'�-resz�' �i rx.J C4 �C7 C� `� f0 C �'�d/ , (' - �!}��0 p7 � _ . � `7-��7 _ .. _ S _ � � . s _ 1__ _. _ �- ��- � �O c�oc�v� c'� 5 �--Y. - , - ; -, ��o�r�Q�-i..c..u�`:.� �G-�.�t�:�i l �4L _ i.17 � I. c�. . � ; _ �- _..�._.__. . ,. _ . _ _ _ ._ a �� "'� e Q = ! � � 8'� rZ�3 � ��z �.. r� � 1�1 = O, D 1(� �Gc� 1� 3 � - j. ._w w..� �v��. M �. , , aa �. 28 / � = �I,y_z'.�,� .3q�;� + �' a �t.i�� - al.'4��Zs� = � ,(o? �.z � _ wP = �C�'� z)�.�{ 3��z)Yz + ��, �� )z +( „�� r� + ��Z �C��Z�ys = I �o, �05 Gt .__�_ __ ` .� ___ . _ ._ � - �� = z�t��5 `- be l �8 --�--�--�-- _ _ . _ . _ ____. :_.Q = 1 •�t $ �o . 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C� � o �� __ _:_ _..�.:_ _ _ o ��, _ ��.�....��.,`�. s� 6� �.�s _ _, . ._ , . <i . .� � �_ . . . _ _. . _. � � �_ � _ . � ^ ..} : g � r.�. ._ . . .... . .:..... ... ... ,._. . .. . .. . . , : .� __._.... _ {1��. - - -. � I_ �. �^ ;.... _. ,-��^r � l �.Y..• I,CA„`. . ... ....._`-'`. S l �" . wt � . li�!.:�/(M• S �Q . : �: _ � � � �.� r� �.:� �.� ��..��.;�. . __ � _. __ . _ _. ___ ._ ---- 2� o sfdrw� ��a,r;�. �' c�,`. �,,,- s . C �� _ :._ tQ�.l� ��;�.e:. �`i� t�.�G.�..,._ — - ._ _ � _ _ _ c�w� .. � cu�c�. w r�..—�—'..�.�. �l.d�'"�p � o C�. � Z� - 5, O�l ��5 RESOURCE by �� -I�✓ date � Z� °�Csheet � of � � consu�TanTs, chkd. by � date � , job no. � Cc _, , � . �nC. subject �,,tc�; � �_" ; C J�'; ., .�. � Fort Collins, Colorado i ;� J . l� � T,� � d- �Y� w��, �� C�� `� � _�� = �0'��5 � (�= S�O�c� av Q= s.sc��.�5 �_ r� = e 38z - � � - � L fl� �� _ - � 3�5� �� 5L�PE = 0.0017 N = 0.016 -------------------------------------------------------------- DEPTH AT AREA AREA DEPTH LEN6TH AREA TOTAL 6UTTER LEFT CENTER RIGHT LEFT R16HT AREA 0.365 0.26 0.36 0.�55 12.75 1.625625 2.25 DEPTH AT piP WP DE�TH LEN6TH MP TOTAL 6UTTER LEFT CENTER RIGHT LEFT RI6HT MP 0.365 1.47 1.18 0.255 12.75 12.75 1�.39 R= 0.145948 A!S = 57.87509 B= 5.08 5LQPE = 0.0077 N = 4.Qla --------------------------------------------------------------- DEPTH AT AREA ARER DEPTH LEN6TH AREA TDTAL 6UTTER LEFT CENTER RI6HT LEFT RI6HT AREA U.382 0.27 0.38 0.21? 13.6 1.3496 2.50 --------------------------------------------------------------- OEPTH AT aP WP DEPTH LEN6TH WP TOTflI 6UTiEk LEFT CENTER RIGHT LEFT RIGNT YP U.382 1.47 1.18 0.27? 13.6 13.60 1G.25 --------------------------------------------------------------- R= 0.1�4071 Q!S = 66.82094 �= 5.B6 � �� c�---� � �l� �. b !-1 � d�/ !I6 dlo.a�a,zs- , , � � � o ep3 .'�',, �b , , _. :aLc-_ . � SLOPE = 0.001; N = 4.J16 �EPTH AT AREA AREA �EPTH LEN6TH AREA TOTAL 6UTTER LEFT CENTER RIGNT LEFT R16HT AREfl 0.385 0.17 0.39 0.275 13.75 1.890625 2.55 DEPTH AT 9iP NP DEPTH LEN6TH MP TOTAL GUTTER LEFT CENTER RI6HT LEFT RIGHT 61P 0.385 1.47 :.18 0.:75 13.75 13.75 16.40 --------------------------------------------------------------- R= 0.1555t►0 Q!S = 68.48662 Q= b.01 1 1 1 1 ' 1 ' I ' 1 � ; ' � � C ��. .�.��.� �.:� �._ �� : �. .�� - -� ,� � %� �c�-�.--� ' ^r., � � '' �-'z-c.= �� i.. c � � �U^_ �-- ; `r�.L.'� �� C.�-5 � � C.��r'�DI� � G� ✓�-�'L G� .� � �� Qr� = i� � '_:. �i'� . ji = � o ��] C_� ._ C, �. � , , �� E-�� s � �' � �-�..�:�- :�� -t:.�� ._ _ b _ � . � `�'(�,� �j = �. L�',.57 � = 1 �t . (�� c_�S � � , .. . , � . _ ..,, , ��o'we- � S�vK..s.-t I� �.` t :.�Gt,�.� _Gt��. . _.. . �' r C(.�t, W� C�"� � � � � C� y�-�,2 �2�. c� •; �� `�.t� �� ; �"., l� �� ' . . ... . . . . . . 5(.�� c�Au�c- ��{-� � 1 1 � - . .._.. -- `IZ � 5t ►�,�- �� ' � . n ,� . _ �.,��; . �-�a �- ��- ,� � ��.�,� �.�. � � �. . o � _ �o.��; �K�s� , � - o a �� 1 , �� o°o� � 1.7�- � ""1 ' � Z �,� } V -L1i.C��Lj'l�Y � � -- O � � 7j f �n. � 3� b � I ' + _... _ �...� � Q= as ,s� �� ,�� c��;) � n= a e S�� —'', �; .� ^ : RESOURCE by �� -� .� �`--�'�-L{��' - date � z� sheet � � of � � consu�TanTs, chkd. by date job no. � s� �nC. subject �� ; � _ ' - ' _ � "4- � =� - Fort Collins, Colorado .�` � ) � , E b p� i� i�r✓L �1 _� date � � � � sheet � � of � � RESOURC v C�nSU�TQNTS, chkd. by _ _ date �ob no. �� 1 � � v r � l ��C. subject ��- �-., . �.. ��--�-`T =; ��_� < � �_ �� / J Fort Collins, Colorado �� ' � ' _SLOPE__M 0�0017_�w----- N-------- �-`�16------------------ AREA CRLCUL�iTION FOR CROiiN TO CL'kB ' DEFTH AT AREn AREA DEPTH LEN6TH AF,En TDTAL GtlTTER LEFT CENTER RI6HT LEFT RISHT HkEA 1 ' , ' , , 0.447 0.32 4.46 0.337 16.83 Y.94 3.61 MREA CALC!lLATi�]N FOR SuRCHARBE �JEPTH A80PE C,ROWN TO CUkB TO�AL DEFTH �IDTH AREH AREa � 4.014 19.42 O.Z1 3.98 DEPTH AT fiP ;�1P DEPTH LEt16TH iIP TOTAL 6UTTER LEFT CENTER RI6NT LEFT RI6HT NP _-_0 447M___1 49_____1_i8y_ 4.:37_»_i6 83--__16.33____19_50_ R= O.f49194 Q15 = 114.�148 Q= IO.t14 ' �i SLOPE = 0.0071 N = 4.016 AREp CnLCULATION FOR CROi1N TO CllRB 1 1 ' ' , �EPTH AT AREf� nREA DEP?H LEN6TN AREa T�TAL 6UiTER LEfT 4ENTER RI6HT LEfT kI6HT AREA 0.447 0.32 0.4b 0.331 fb.83 �.84 3.b1 --------------------------------------------------------------- AREA Cfi+LCUlATI0t1 FOR SURCHAR6E 4EPTH A60VE CkO�iN TO GURB TOTAL DEPTH �I�TH AREA AREA SLQPE - O.�Ol1 --'N-------- O.OIb��_ �/A ------------------------ MREA CALCULATION f�JR CROWN TO CUR9 DEFTH AT AREA c�REA DEPTH LEN6TH AREA TDTAL 6UTTER LEFT CENTER RIGHT LEFT RI6HT AREA 0.447 0.�2 0,�6 O.JJ7 16.83 Y.94 ;,61 AREA CALCULATION FOR 5URCHAR6E DEPTH A60VE CRONN TO CURB T�TRL LEPTH IiIDTN AREA AREA O,IOZ 19.A2 1,98 �.54 OEPTH �T 41P WP DEPTH LENfiTN YP TOTAL 6UTTER LEFT CENTER R16HT LEFT RiGHT �iP 0.447 1.44 I.18 0.337 Ib.93 1b.93 19.5U R= 0.28b946 915 = 145.9p26 g= l2.80 4.084 19,42 1.b3 5.�4 DEPiH AT �IP �IP IIEPTH LEi16TH iIP TOTAL GUTTER LEFT CENTER RI6HT LEFT RIfiHT hIP ,Q.44i 1.49 1.18 0.331 16.53 tb.93 t9..`i0 ---------------------- R= O.Z68917 Q!5 = 134.7578 9= t2.Zb ' �„ � � �- � ,k')1 r�-� � � -� . 3 ` -�--- - ----------- ---- ------- -- ---- ------ -- - - -- 5 t o�------- -- ---------= -- -- ----_,_------ 5,°,--- ', 5,a'-�� GRADiNG AND DEMOLITION NOTE � � ,,\ BENCHMARK -- -� �, �� ; ji ; �\ 1, The contractor �hall be solaly rasponsible for safety in, on . U' � i�,_ or nbout �he project site. My damaqa to adjacent pzoperty or ______ ___ ,, , The N.E. Bonnet Bolt of fire hydrant at the southwest corner .- �� c 1�� '! � \ ----� ROGERS PARK DRAINAGE CALCULA7'IONS utilities, not designatad for removal, relocation or % ��n� n o replacement, shall be repaired and/or replaced by tne of West Mulberry Street and Tyler Street. Benchmark i� �\ '- RATIONAL MEFHOD contractor et the contractor s expense. / � ,_--- , - �i� � � i ! \� ; �� \�� ', ; � DEVEIAYED CONDI170NS elevation is 5090.21, City of Fort Collins datum. '� , 2. The con�ractor shall be zesponsible for obtaining any permitc � or licenses required for the performanca of the vork ns �R��ION CONTROL NO�'ES �� 0b' � ,` i' applicable to the praject. ., i , ' '. COA4POSITE PEAK FLOWRATE � � , � '� t � CONCEN. �� ! 1 \ POIAI'[ BASINS �EA C 2'� 1. The Contractor will be tesponsLble to llnit vind and ceinfell erosion during consGruc[lon �� !� 1'il ��ti/ 7. The landscape architect and�or ovner make no varranty as to 4 and foi the interim period between completion of cons[ruction and.'when permanent "'- \�J I� i I (ec) 32 ' the COtLeCt7les5 atld/OL COmp�et¢ness opf the eX�Stln Utll ty �getatlon is es[eblished. Ii, duxing construction or in the interim period, erosion is i I� i1 '� � p� 7,1g 0.50 7.8 locations shovn or not shown on the lans. The contractor J AA 5hL11 be T'espOnslblfl fOZ fS91d vflriPylny th6 hOt1201ftd1 d11d not effec[ively conrrolled from tha si[e, [he Con[ractor vlll provide en erosion con[rot O ��I�/1 , 9 9 pinn and [he nece.va�n'v equlpment., personnel� nnd materlels to correct the erosion con[rol ; \11 ; ' 2 B 8.6a 0.20 2.2 B.5 vertical location of all existin utilities includin water, nd other �, j �� y p,g 15.83 033 6.7 �� sewer, stoYm drains, gas transmission lines, a pzoblen. The Ctcy nE Forc collina Scormvater Uclltcy vill reviev and approve che �� y Con[rector's plen anA ovrrsee Smplemencn[ton of Che plan. i 1� �1 � i �Q�S' 3 C 0.80 0.20 0.2 1.0 utilities above and below the aurface that ma affect the �� i '� �{\j ��7 1 3 q_g project. Should any discrepancy or confli ct be discover ed the � ��. 4 D 1.07 0.49 contractor shall notify the landscape aichitect lmwediat0ly, 2. No soil shnll be cracked onto Mulberry, Vesc Laurel, Pear Stree[s, or Rocky Roed by any `� �38 1•� 3'8 and 5ha11 nOt Cont�nue ConStiuCtlon ulltil said ConPlict can be acttvity during construcHon. The Gontrncror vill provide whacever means necessary, such / `---�� 1 1�I I'I��I� ' 4 C,D 1•87 33.2 tesolVOd �n VI'iting. � - as stabllizing conefrnrtlon access road with 6" of grav¢1, to prevent soil tcacking. If i � -_ i �� p,� 8.1 soil is tracked onto t}�e streets or road, rhe Contractor will clenn [he s[reet immedfatelv �� S REMOVE E XISTING !, �i ��1�!� � S A�Bg D '0.75 0.93 1.6 5.6 4. The contractor shall notify all utility companies at least 48 end prevene che prohlem from reoccurrfn�. The Owner mny 9OSPPt1A all ar parc of eh�� % 'os S H E D AN D F E NCE '� � � 6 p 1.7q 0.30 0.9 3.5 houra prior to begSnning construction. construction activitles �mtli the strrrts or road ere clenned. ;� ---�-_- � ' ' o.�z o.zs o.i o.s � �'��'� �� i'� T G 5. Any constTUction debria or mud-tracking in the pUblic right- 7, upon complecton of rhe curb tntec consrn„�iton, che Concrnctnr vfll construct che ginvel , �.,-� 510g � �� ,Y� '- - 8 H �y� Q.yp 0.3 �•� of-vay resulting from the work shall be removed immediately by fiLcer around ehe in7ec, ns shown on sha<r c-4. The gravel inlec vill remein uneil che ; � � �� ' � �y �z� p-� 0.4 the contractor. sereec fe pavee. � � + `\" �� '� I i� / Q 7 0.56 0.48 0.6 2�5 6. Th¢ cOntI'OctOL shdll pLOVlde dll 1lghts� Signs, bai'ilcdde5� h, Upon comple[ton of [hr nrex i.nle[ const��lon, [he Contractor will. cons[ruc[ the strnw � 5104.5 � ; � o.b Z.5 � � �� i 10 I.1 0�� '� flagmen and other devices necessary to provide Por the public bale dike nro��ad che Inl.er, nc showr, or, ci,,...� r.-4. 'rhe Cone[ac[oe wtll maincetn che strnw q �- ! �'I i � �� K� p5g 0.20 0�3 0�9 safety on and about the site. The contractor shall furnish bnle dike uncil perm,nenc �egecacton iq Ps�ni�ltehee. � �/ \ ! 2.� 9.9 appropriate Craffic control and safety measures in acwzdance - � ��--�`��-� �� i �2 � 3'� �'32 90 with the raquirements of applicable` Highways and 5. During conseruccfo.� ,11 InsfnlleA sror�� !,.,in p�p�s will he proce�cea from aebris a�,a + '�� EAS E M E NT�+ �� lZ 5 81 O� Z' p 2 p sedlment en[rence by u[ilizing s[[aw bnles �r other sultahle means. I O H-L Trans ortation authority. 5105.06 1� ', ) ' ,3 M o.� o.so o.� i �. Adjust rim of all cleanouts, manholes, valve covers and survey b. Upon completion oe cnP ��k CIlA9C 9c ri�� wP4c Lsarel/Peac sc�aac parking ioes, ii,P � 1�`�� mo0ume7�t Covers t0 flnish gCadf. Contrector ehall coneCruct n e[rav bale AIk� cfinllnr to rhe de[�il ehown on Shee[ C�., bu� R 0 C K Y 1 I � �, i modifted for the vnik r}iase. The Contractor vill maincaLn the s[raw bales un[L1 permanene ! �---- � ! q P vegeta[ion is e9tablizhed. R O A D � ��-__--� 1�� 8. Contractor shall clear and rub the area vithin the s ecified 1 � ��`'� i� limits of landscape construction. Debris, vegetation, roots � ! ; 1�� ( and other materials not suitable for backfill shall be removed 7. The Contractor will cons[ruct strnw hnly dikrs or stmilar erosion conCrol s[ructuxes as 5 1 04 � li ��1 � fiom the elte ai�d disposed of by the contractoz. directed by the Owner's representa[ives to minimize eeinfall erosion fxom the si[e, as j �` '� �� required during consccuccion. t � � � �i ��!�! I i�� I 9. Contractor shall take appropriate measures to protect adjacent � � 1I I� V property, tIeeS and VEgetation. Aieas outslde the 11IDitS of 8, The Contractor ahould not dis[urb vege[n[ed a[eas Chat are designated to remain in [helr i �� vork as shown on the plans and/or cross sections shall remain exiscing scnce. . ,I' I / � � � , ! _5 undisturbed. S � i I'� /` � �� 9. ihe Contractor should complrte the rough overlot grxdLng of [he si[e ln one opecntion and i �� '� � / � � � �_� �. �._; � ' i .i �, � r 10. Gradinq operations shall include ahaping and gradinq of lenve the surface of dtscurbed nreas in a roughenea seace. I[ may be necessary co use n \ � \ } C _ ` �I �� ' �� drainage svalea as shoMT on the plana. Flowline elevations ciller or disk co rooghen [he aurface. The roi�ghness should be directed perQendicular co � • ' ' �' ehall b8 show�l OIf the plans oi ciOSa seCtlotls. All 0l8as the p�availtng vinA. Ftnal grnding shoulA be complet«d �use before the aree ia needeA or I � � � � j `��-- 5� �3 _ , i�i i) `' f shall be shaped and graded in the field for positive drainage Inndsceped. if vtnd �roston is e pronlrm, che C,ontrnccor wtlt vse whaeever sulcnble � ��' aWa fIom BVCd auL'faCeS oC foLLndatlon8. menns, svch ns a Aust p.�lllnctve, necessnry e.o control vLnd eroslon from the st[n, as ' � � -� � ` � � LEGEND : Y p /� diCected by [he Ovner'a [ep[eaen[n[Sve. I � --"--- ��'� �'j�i�/ il. easemap information vas derived from a topography survey ; ��\ l.�, 1� prepazed by Resource Consultants, Znc. � WA��, u-iAS� ; ' ' �' '- ,•`'. O BASIN IDENTIFICATION 12� lineelevations are to top of vall, top of pavement, or flow I I � � i I ,, 13. All trees shown are to remain. All others to be remove . i � O � � �._.-_ ` '� �I �, Ovnez's representative to flag trees prior to operations. � 2 CONCENTRATION QOINT /�' ,' , ------� / i-- - -- . . �. \ __ ,, � , I��i 14. Remove all fences except on pertmeter of park property. -__ __ _ �� I � / � � �I % � I, Remove Mulberry Screet fence. � 30' 20' 10' 0 30' 80' � � ; ! ---� `��5�02' �__��!n I'I'i�', BASIN DIVIDE ;� '; � � '. , ', �'� �� ,- � � � -510 �, ! ; '� ��"�_-'' �,� DRAINAGE FLOW DIRECTION ORIGINAL sCAI.E: 1' = 30' , � '� ; i '� � I� �O r� � S09 � Ii �� r�I � r � i� �.'. i� � � � i � �� , 1. 2 5 � `; `� � �' : � ; ;' �' '�� o�� '�, �, , � , , � � �--- - - -- --- �.�-, � . ------ -- -- . , 1 1 - _ � / �- - � �- - '--- 1� � / � / �_ J --- --- ---�� _�) -- - _ \�� ,`� I,, O -- - -- ----- ------- __- ------------__ ___-- - -- ,- J �- ,,--- ---- 5 �� o , . �I I ,� , I � ; -- ,� _ � , � , _ --------- -- ,-- --. - ---- O < , � _ -- - __ _ - ----_-- --___-_______-, - -- - __---- --- _-� -�. _ � �_ . �- < <- -- ---1 � �� 1 ,, __- ,�"" \�._ % �i j J 1 n+-� � ' ,� \ � � � �� 1� r�' --- -'. �. , �, \ i.. � , , 5�`0 '_- .'� �' � .�- A `�� ' � ' /� ( i 5� ; � + �09 .7 ,�� ,-.'- `CURB INLET ' o�,- , _,; � � � ; � � ��hi�� , � ii /� a j , , �j0a� �� -- \� 1 � l � � �� ' � j C- 4 a C- 5-- � - , �'� O ; j� 5101 �i .t� b � � . , � I a /' 6 -� �' �� I R R I G AT I 0 N L AT E RAL �� '� � � + 09 8.5 , .. -5°� �2 %� �� ; ' � --,,\ SEE PAGE C-S & C-9 � ��!,� ,." � . .. �` �' � � � ��` .. , ( ;' -� ' ' I �` ` � - � ' ' � ,, ; ,� �' !', +5100.5 s .5� MIN. ' , '� .9�,' �,, ,� ; -�� , I , � � NON-DRAIN � + �, i�� . EE H Efi C3 i � �\ /- J I O I ' / 1 \ � 1 . , 1.._,= s , i i�, o ,� U B + � = � � .9,� < � ' R D�I � I 1 'o ' I I; , •i• '� (� 1 � , - -� � ;� �- , . � i �� EWT ' WALK , % � I 1 p ' � �' ; - �,c .7 5 �� . � ' ' I % � � , , '� i' �� '` tG i � , . . � �', i ; i � � ;'�, ��, � ! I 510 0 . 7 ,% � � �' � � �, � � ; � ,� , �. { �-, ( �� I ��` ____`� �' � �� i � �� i I � � � � � .� � � �� i i L" '�, o�� , ; � �-�/ i ; �� ,,�; ' ` , +509� i ; N � � . �! 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