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HomeMy WebLinkAboutConsultant Review - 11 BAYFIELD DRIVE 6/30/1988 MMIMMMIM CHANNEL June 30, 1988 Mr. Scott Stocking Town Planner NORTH ANDOVER TOWN HALL 120 Main Street North Andover, MA 01810 Re. Material Installations Addition Project Lot 1B (formerly Lots 1&2) North Andover Business Park Dear Scott: This proposal received Conditional Approval from the Planning Board in September 1987 (see attached). Enclosed are revised plans and drainage calculations. We are seeking amended plan approval prior to filing for a building permit. Thank you for your cooperation. Sincerely, a James Bourgeois, R.A. Vice Presdient Architectural & Engineering Services Channel/Bayfield Companies on behalf of Material Installations, Inc. abs Enclosure cc: Thomas Neve, Neve Associates Norman Gill, Material Installations Michael Rice, CBC 242 Neck Road Haverhill, MA 01835 508-374-4511 FAX 508-373-4900 of � uuuuouuuouuuuuuuuuummuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuumm�uuumuuuuummmmiu�m�ummmmmmmmmumim��uwm�mumuououuuuu!w�uwuuuuu�immo�muuuuuuuuuuuuuuu�uuu�uuuuuuuuuuuuuuuuuuuuuuuuuu�o�,m�wmuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuumi�,wwimiummm�umr�mn umuuumnuuuuuuwuvuumoimu�ioi�am uuuuum�uuuummmu�uuuu�uuu�uwwu�wuwwu�uu�hnmmumuiu�wmuv�muouuuuuuuuHnuuuuu�uuuuuum�m�ti�uuuuuuuuuuuuuu�uummumimummmmmummimmiiuuwu��u�u�uumuuu�uu�uu ceu��uu z ' TOwzl of OFFI(�F_S OF: o °, 1' o Mein Slrc�c�t APPEALS North Andover, BUILDING ;,''4::;:; t9 L. M;ISS�ichusettS 0 184 5 CONSERVATION 3 @"QH°eat (t INVISION Of; (61 7)685-4775 V1EA1 All 1 PLANNING PLANNING & CO 3 MVNITYI ME VELOPMENT KAfZAPH.P. NELSON, LARECf'OR September 2, 1987 Mr. Daniel Long, Town Clerk Town Office Building 120 Main Street North- Andover, MA 01845 Re: Material Installation 11 Bayfield Drive North Andover, MA Site Plan Review through Special Permit Dear Mr. Long: The North Andover Planning Board held a public hearing upon the application of Channel Building Company, 23 Main Street, Andover, MA. on Monday evening, August 3, 1987 in the Town Office Meeting Room. The hearing was advertised in the North Andover Citizen on July 16 and July 23 , 1987 . The following members were present and voting: Erich W. Nitzsche , Chairman; John L. Simons, Clerk; George Perna and Paul Hedstrom. John J. Burke was absent. The petitioner seeks a Special Permit under Section 8 , paragraph 3; Site Plan Review. The purpose of the Site Plan Special Permit is to review the proposal to expand the assembly and live storage areas of the existing facility by approximately 18 , 200 square feet of land on the North side of Bayfield Drive known as 11 Bayfiled Drive in an Industrial-1 (I-1) Zoning District. John Simons read the legal notice to open the public hearing. Letters were received and read from the Fire Department, Board of Health and two (2) letters from the Conservation Commission. Jim Bourgeois representing Channel Building, Material Installation and 114 Associates presented the proposed plans. MOTION: John Simons to continue the public hearing until the August 17 , 1987 meeting. SECOND: George Perna VOTE : Unanimous On August 17 , 1987 the public hearing was continued. John Simons read a letter sent to Mr . & Mrs . Redman from Material Installation with regards to lighting and traffic issues . Jim Bourgeois of Channel Building presented the Planning Board with revised plans . y Page 2 . MOTION: By John Simons to close the ublrofaring. SECOND: George Perna �EP 3 v W fi VOTE : Unanimous On August 31 , 1987 the Planning Board held a regular meeting and voted to approve the Special Permit application by Channel Building to construct an 18 , 300 square foot addition to the existing building located on Bayfield Drive at the intersection of Willow Street. Three issues of concern were discussed at the Public Hearing that should be addressed in this Conditional Approval are as follows : 1 . The unfinished Cul-de-Sac at the end of Bayfield Drive does not allow for adequate fire protection and access- egress for the existing building. It was discussed that the Cul-de-Sac was not finished by the developer of North Andover Business Park prior to this date because of a pending application to the Commonwealth of Massachusetts to create an entry onto Route 125. The Planning Board is in receipt of a letter from the Division of Public Works dated November 14, 1986 denying the request for emergency access onto Route 125 and is concerned that no work has taken place on Bayfield Drive thru 1987 . 2. Concern by abuttors to the North of Material Installation property of truck noise and lights during the night. Proponents for the project stated that the newest dwellings are 200 feet and 400 feet respectively from the building, but admit that into the winter months , a lack of foliage in the intervening woods may be cause for concern and have suggested that truck traffic be directed onto the locus by way of the Willow Street entrances thereby minimizing headlights being directed to the North by the present access from Bayfield Drive. 3. There was a concern by the Planning Board of the increased rate of runoff being produced within the North Andover Business Park by the inclusion of additional impervious pavement and building additions. The applicants Engineer, Mr. Tom Neve, has submitted drainage calculations stating the peak runoff has been decreased from the locus due to the fact that percentage of impervious area on the lot has been reduced from the overall Master plan of the Park and that the lot size has been reduced. Notwithstanding these factors, the Planning Board recognizes that if this lot size has been reduced, another lot. in the Park must have been increased, and that Mr. Neve nor the Planning Board has an accurate accounting of the present impervious area versus the original Master Plan impervious area of the Business Park overall. > Therefore, the Planning Board renders;= this' Conditional Approval foi- bhe construction` of the proposed building=additions for �., Page 3 : 1 . Bayfield Drive will be constructegjXiZlccordance with the Subdivision Plans of No,,rth ,'jkndbVdr Business Park and be brought to at least bind8Y pavement to the satisfaction of the North Andover Fire Department and to the Division of Public Works prior to construction of the building addition. 2. The lawn area to the East of the proposed building between the building and Willow Street shall be designed as a Detention/Retention Pond to further mitigate runoff flows and to account for loss ground water infiltration due to the impervoius area. This will necessitate redirecting runoff flows into the Ponding area, preferably from the parking lot prior to discharge off site, with proper pipe sizing to detain storm water flows to the maximum possible. 3 . Truck traffic flow will be required to access-egress the property from the Willow Street curb cut only and automobile egress the site from the curb cut on Bayfield Drive. This will be a condition for continued occupancy and will . be implemented by the use of one-way signs and exit only signs and others as deemed necessary both installed at the two curb cuts as well as at the truck docks and pointed indications on the pavement throughout the parking and access-egress areas. 4 . Upon completion of the building addition and prior to building occupancy, the applicant shall file an As-Built Plan of the total site showing at least, but-not limited to the following, pavement grades, rims and inverts, drainage size, access- egress signs, lighting landscaping and all utilities. Said plan to be prepared and certified by a Professional Land Surveyor and submitted for approval by the Planning Board. 5 . The landscape plan as submitted does not show the existing row of planted arborvitae to the rear of the existing building and the Planning Board is of the opinion that the proposed planting of arborvitae will be of the same nature, and therefore will not mature to a full effective screening for many years and therefore will require that in addition to the landscaping plan as submitted being conformed to in its entirety, a six (6) foot closed stockade fence be erected along the property line from a point starting fifty (50) feet from Route 125 and extending Easterly to the Easterly line of the proposed building addition. 6 . In accordance with the Fire Department report of July 31 , 1987 , the following shall be provided: 1 . The addition must be equipped with an automatic fire suppression system (sprinklers) and. the fire detection and alarms form the original building must be extended into the addition. Both of these systems must have plans submitted to the Fire Chief for approval prior to construction. Page 4: 2. The Fire Chief has requested that information regarding the material to be stored and the amount of storage for products in this expansion be submitted to himself or the Fire Presention Officer. 7 . The North Andover Conservation Comission' s Order of Conditions under File No. 242-193 , shall become a part of this approval and be strictly adhered. 8 - In addition to the aforementioned Conditions, the Planning Board approves only that work as shown on the submitted plans namely: 1 . Sheet Ll-1 dated 9/5/86 and revised 8/13/87 2 . Sheet L2-1 dated 9/5/86 and revised 8/13/87 3 . Sheet L4-1 dated 9/5/86 and revised 8/13/87 4 . Unnumbered Sheet dated 8/13/86 and revised 9/9/86 and entitled "Scheme 3" 9 . Any proposed changes and/or future building expansion will be the subject of a new Public Hearing under a new Special Permit Application and further that any changes from these approved plans and that may be shown on the As-Built Plan submitted for approval prior to occupancy will negate this Special Permit and will require a new filing of application. Sincerely, PLANNING BOARD Erich W. Nitzsckfb, Chairman cc: Director of Public Works Highway Surveyor Board of Public Works Tree Warden �a Conservation Commission �:• ;_� ;;: Building Inspector Board of Health , Assessor Police Chief Fire Chief Applicant Engineer File Interested Parties PAGE; THREE NORTH ANDOVERIBUSINESS PARK' 23 . Plans do not show lot grading and cuts and fills in accordance with Sec. III , B, 3,k, 24 . Subdivision does not tie into any existing monumentation. 25 . Plans do not indicate why only Lot 8 should be considered the subdivision. Under the Subdivision Control Law and the Planning Boards Rules and Regulations all land of the applicant being 1r}s subdivided including all dattL and streets should be part of the subdivision. 26 . The applicant has not submitted a Statement of ';Environmental Impact in accordance with the Preliminary Plan approval . 27 . Applicant has notdemonstrated that Willow Street has the proper Street and pavement width along its entirety from Route 114 to be able to handle the increased traffic from this subdivision or to allow the Town of North Andover to maintain such proper widths. 28 . The applicant shall beaware that all underground utilities will be installed prior to the placement of the binder pavement: -If this is not performed, no lots will be released. 29 . The Plans do not reflect covenant restrictions that would prohibit lot development encroachment into the 100 year flood plain. 30. ,:, The plans do not reflect the existing utilities and elevations on Willow St. extension. 31 .' The plans do not show the termination of the drain easement on Lot 7 32 . The Plans do not show a proper drain easement on Lot 2 at the Margolis property. Considering that the drain inverts are to be set below the existing grade very close to the property line, proper rip-rap and erosion controls -shall be detailed to :.,insure that surface water from Lots 1 and 2 under development condiitons will not adversely affect the Margolis property '@4:2r the integrity of the roadway embankment. 33All drain Easements shall be delineated on the topographic and drainage "plans to insure the Planning Board and H. S . that the drainage is in within the Easements. GE: TWO NORTH ANDOVER BUSINESS PARK Board can verify the extent of imprevious `areas . This is important so that the Planning Board can verify if development is in keeping with the drainage calculations dated March, 1983. or -_�4r C_cJ 11 . Watershed bor(lering lineshave not been shown on Definitive Plans so it must be assumed that the detention basin is allowed also to flow on land of Symosek and create additional flooding. Developer is required to mitigate the additional flooding on abutting properties to zero. In accordance with Section III , B, l , e) of the Planning Board Rules and Regulations . 12 . This subdivision ignores the Prelimianry approval decision in that the drainage under Willow Street is being utilized as a drainage constriction. The H. S . has requested that the drain under Willow Street be enlarged and that all drainage constrictions be outside the roadway. The existing 15 inch drain was considered to be temporary by the H. S. 13. The typical roadway area section is not in compliance with the rules and regulations, specifically Section V, c. 14. There shall be no weephole in drainage structures as noted on detail sheet. 15. Plans do not reflect requirements of the Dept. of Public Works in their report of May 8, 1984. 16. Plans do not reflect requirements of the H. S.. in his report of May 15, 1984. 17. Plans do not reflect requirements of the Fire Dept. in its report of April 26, 1984. 1$: Plans-.do not reflect the requirements of the Conservation Commission -heir Order of Conditions dated October 14 , 1983 under File �IaTQ 242-193..'. 19 Plans do not reflect a buffer zone on Lots 6 and 7 abutting a re�� de�ntial zone as required in the Preliminary Approval . 20 P]ans ';do nA show solid line on proposed street and lot lines . 21 No basements have been dimension-d_in proper form._for- conveyanQe. l2' Phans do not show erosion and sediment control methods in accordance with Section III, B, l .k. of the Rules and Regulations . NORTH ANDOVER BUSINESS PARK Lthep U�iRD 1 . In accordance with the Preliminary Subdivision Approva , do not show a c losed water main system down Route 125 to Hill- side Road as required by the Dept. of Public Works with the Preliminary approval . eT; 2 . All other aspects of Dept. of Public Works report in accordance with Preliminary approval . r<, 3 . Drainage calculations have not been submitted based upon the Order of Conditions from North Andover Conservation Commission. 4. Drainage calculations have not been submitted for all drain pipes. S. Project proposes filling, raising the 100 yr. flood elevation from elevation 236 to elevation 237 . This additional flood height will cause flooding on land of Margolis through the proposed twin 18" drains at Station 35+50. Project should mitigate this flooding. IAI- 6 . R-equire municipal fire alarm system as requested by Fire Department. 7 . The plans do not indicate an access egress onto Route 125 in accordance with `the Fire Department request and in accordance with the Preliminary approval . 8 . No documentation has been submitted as to ownership of the existing Willow Street in its entirety,either private or public , in accordance with the preliminary approval , nor is any information provided documenting by metes and bounds the outside limit of Willow Street. � . Drainage si i}�rri-i Lied a rc' c.icr l,ed M<lrch 1110F i1nd indicate 31 .98 Acres of impeevious surface with plans which a only show approximately 3 Acres of roadway. Proposed site plans of lots documenting the impervious area should be submitted `so that they can be verified with the Asbuilt Plans . 10 . iRequire that As-Built Plans of the entire subdivision be submitted including all lot development so that the Planning A A !1A, ASS , A INCO April 19, 1988 Planning Board Town Hall North Andover, MA 01845 ii RE. North Andover Business Park, Lot 1-B, Materials Installation For Channel Building Company-Revision to Site Plan and Hydrologic Analysis Attn: Town Planner, Scott Stocking Dear Board Members : Please find herewith and attached: 1 . Revised Site, Grading and Utilities Plan-Sheet L2-1 showing the new addition, parking and circulation pattern and new drainage proposed for the above-referenced lot. 2 . Revised drainage calculations which compares the new proposal with the Master Site Plan previously approved for the Park. Please note that these drainage calculations clearly demonstrate that the site plan as proposed creates less of an impact than the Master Plan had indicated. Please note that the peak rate of runoff shall be less than permitted for the 100 year,' 25 year and 10 year storm events. Please accept this revised site 'plan since it is consistent with Master Site Plan for this lot. If there are any questions regarding this project, please do not hesitate to contact me. ti Very truly yours, THOMJ�S E NEVE ASSOCIATES, INC. Thomas E. Never, P. E. , P . 1-6. PrPnident J i IT) T101)qe0i C3 447 (X() 110!0 _)N POAD I AND �111 JOW-YOFM TOP�',FIF-1 (), MA 01(011 I AND I IIJ ill ANM III', ((',17) fin I � ] ` . , Ddtw for LOT l0. m4liN", ����N}Nks INSTALLATION P,�nurmd bv THOMAS C . N[VV A5SOC\6yES, INC. T0PSFX6LD, MASS \ 8�pRDD � EVOOT SUWCATCHMEN| ) to 2 °."="=..".=...°..."..~."...==~.~~~.~ SUBCHT[HMENT I SITE SUQCHTCWMEMT FROM WATERSHED PLAN 80 98 AREA- 4.39 ACRES SCS TR-20 METHOD 20 79 LEN6TH= 1000 FEET TYPE Jl 24-HOUR STORM 0 0 SLOPE= .8 % RAINFALL- 7.0 INCHES 00 Tc- 21 MINUTES -- - - 0 12,68 HRS \00 94 � VOLUME= 1 .93 8F � SUBCHTCAMENT \ RUNOFF � SITE SUBCRTCHM[NT FROM WATERSHED PLRN 26 - 24 20 . ~ Is � w � + \5 o 1 � ~ 12 -- 10 .^ PEAK= 26.8 CFS u 'q VOLUME- 1 . 93 AF OJ TIME (hours ) SUBCHTCHMENT 2 SITE AS pH0POSEO~EN%STING AND NEW MOOlT%ON 52 98 AREA- 4,39 ACRES 5CS TR-20 METHOD 48 73 LENGTH~ 1000 FEET TYPE II 24-HOUR STORM 0 W SLOPE~ 1 .0 % RAINFALL- 7.0 INCHES Tn~ 23 MINUTES 12. 10 HRS 09 VOLUME- 1 .81 AF f)61O fol- LOT 10, W. TERIK-6 INVALL(MON I'vapaved by THOMAS L. NEVI. ASSOCIATES, INC. YOPSFIEL.D, MASS 19APROB SUDCATCHMENT 2 RUNOFF SITE AS PROPOSED, EXISTING AND NEW ADDITION 24 , 22 - AREA- 4 . 39 RC 20 - CN- 09 le - Tc— 23 MIN ca 16 - 14 - SC TR-20 METHOD 12 - TYPE II 24—HOUR STORM 10 - RAINFALL— ? IN la- 6 - PERK- 24 . 3 CFS 4 @ 12. 1 HRS 2 . VOLUME® I . BI AF TIME (hours ) � ` . i � Data for 104 |0, NAL*r^ HIIlE �(ALS lW'ilA1LAfl(JN PaQm 3 � Prbomrmd bv YHOwh\ F. NVVE 6SS0ClA1CS ' INC. \0P5FlELD . hi�sG i0MPR88 5,coirm uvpjr 5UBCMTCMM[MY > to 2 =~~~=..=...~.......~� ..~.=" -­==---=~--~--~" SU@CHTCHMENT I SITE SU0CATCHM[NT FROM WATERSHED PLAN 80 98 AREA- 4.39 ACRES SCS TR-28 METHOD 20 78 LENGTH= 1000 FEET TYPE ll 24-14OUR STORM 0 W SLOP[" .B % RAINFALL- 5.5 INCHES Tc- Z] MINUTES 0 12.08 HRS \00 94 VOLUME= 1 .48 8F SUBCRTCHMENT 1 RUNOFF SITE SUBCRTCHMENT FROM NRTERSH[D PLAN CN= 94 -- '- Tc= 21 MIN ~ 1° w 12 - SCS TR-20 METHOD TYPE 11 24-HOUR STORM ~ 18 -Z RAINFALL- _ - [� G VOLUME- 1 . 49 RF Cu TIME (hours ) - 5UBCHTCHMENT 2 SITE AS PRO9USEO,E%I5TING AND NEW ADDITION 52 98 AREA- 4,39 ACRES SCS TR-20 METHOD � 48 79 LENGTH~ 1000 FEET TYPE Jl 34-HOUR STORM W Q (3L0PE- 1 .0 RAINFALL- 5.5 INCHES � � Tc~ 23 MINUTES PEAK- 18.3 CFS 0 |2. | ) HRS � 100 89 1 .37 0F � | |� |� Patio 4 E , WU ASSOCIATES. INC. T()PSFIELD, MASS t t �-c Q LALL-1i 0, ....._i 9 K'Aw-a at-ft"ng-C,Q-tau a A p-m-a—----- SUDCAfCHMENT 2 RUNOFF SITE AS PROPOSED. EXISTING AND NEW ADDITION ARE 4 . 39 AC CN- 89 13 Tc- 23 MIN J2 SCS TR-20 METHOD 10 TYPE II 24-HOUR STORM RAINFALL- 5. 5 IN id 5 PEAK= 18. 3 US 4 @ 12. 11 HRS 3 2 VOLUME- 1 .37 RE CV M;-1U-) W rl CD CD TIME (hours ) it ` ( � ' � Data for L01 10. Nflk]P, MTrRjALs XN�;THLLATlUN yrermrmd by THOMAS F . N[UE ASSU[l AlE5 . INC. T0P5FIEIu . MAS6 sybom Gvw T SUBC8TCHhENT } to Z .~~~~~."~=~~~~~...~=~~....~~~.~~~~�~���~~���~~~~~~ / SUQCMTCHMENT V SITE SUBCATCNMENT FROM UATERSHE0 PLAN � MR Q 80 98 AREA~ 4.33 ACRES SCS TR-20 METHOD 20 '79 LENGTH~ 1000 FEET TYPE I{ 24-HOUR STORM 8 0 SLOPE= .8 % RAINFALL- 4.8 INCHES � Tc= 21 MINUTES @ 12`08 HRS � \00 94 VOLUME- 1 .29 8F � � SUBCATCHM[NT } RUNOFF SITE SUBCRTCHM[NT FROM WRT[RSHED PLHN RRER= 4 . 39 AC is /2 * l + 10 - SCS TR-20 METHOD g TYPE II 24-HOUR STORM X RAINFALL- 4 .8 IN 2 VOLUME- 1 .29 FIF Ln u � / TIME (hours ) 5U8CHTCHMENT 2 SITE AS PR[PD9ED,EKISTING AND NEW ADDITION � 52 98 AREA- 4.33 ACRES SCS TR-20 METHOD � 48 79 LENGTH- 1000 FEET TYPE 17 24-HOUR STORM i W 0 SLOPE~ 1 .0 % RAINFALL- 4.8 INCHES Tc~ 23 MINUTES P[ W |2. | \ HRS ' )W0 89 � VOLUME~ 1 . 16 8F ' ! �! .| / �` Coo t a Ear t0l 113, NAW. HAURIAL-S INSIgAlt (ATION I'l VJ)dF 00 byl HlOhAS E . NIVE, ASSOCIATES, INC. l0flSFJCLD,- MA )5 SUDCATCHMENT 2 RUNOFF SITE AS PROPOSED, EXISTING AND NEW ADDITION I t) - 13 FIRER- 4 .39 AC 12 CN- 09 11 Tc- 23 MIN 10 9 - SCS TR-20 METHOD 8 - TYPE II 24—HOUR STORM it 7 - RAINFALL- 4 . 8 IN 5 4 PERK- 15.6 US 3 e 12. 11 HRS 2 - VOLUME— 1 . 16 AF (Oki TIME (hours ) dl rrrI IY f II T � t n . SEP 30 V � i THOMAS L/' . r E lc.HANNEL BUILDING CO.! A7t`7®t.1A F 11 C- September 30 , 1986 Conservation Commission Town Hall North Andover, MA 01845 RE: North Andover Business Park, Lot 1-B , Hydrologic Analysis Dear Members : An hydrologic analysis of Lot 1-B (previously Lot 1-A and Lot 2-A) in, the North Andover Business Park was calculated in order to determine the peak rate of the discharge for the 100 year storm. The analysis compares the proposed conditions (building addition and regrading). against the "Master Plan" proposed for Lot 1-A and 2-A. The hydrologic analysis was conducted using the S .C. S . method. The entire site was considered in the analysis with the exception of the narrow panhandle area running along the west side of the Willow Street ( extension) , which will remain unchanged according to the site development plans . The soil was determined to be in hydrologic soil group C (U.S.D.A. soil conservation maps) . CN WATERSHED PLAN PROPOSED CONDITION - Impervious 98 4 . 19 acres 2 . 08 acres -Regraded area -Lawn-fair condition 79 1.57 acres 1 . 93 acres -Weighted Cn 92 .8 88 . 9 -Time of Concentration 10 min 8 min See Hydrographs ENGINEERS 447 OLD BOSTON ROAD LAND SURVEYORS TOPSFIELD, MA 01983 LAND USE PLANNERS .(617) 887-8586 CONCLUSION: The entire site was considered as one subcatchment, to determine the overall runoff leaving the site. The runoff in both the proposed plan and the "Master Watershed Plan" drains to the same area east of Willow Street. HYDROLOGIC SUMMARY Master Watershed Plan ( 100 year storm event) 38 .7 C.F . S . Proposed conditions ( 100 year storm event) 27 . 1 C.F. S . The peak rate of runoff is less for the proposed conditions as opposed to the "Master Watershed Plan due to two factors . 1 . The lot size has been decreased 2 . The percentage of impervious area on the lots has been decreased Very truly yours , THOMAS E. NEVE ASSOCIATES , INC. Thomas E. Neve, P .E. ,R.L.S. President Enclosure /r THOMAS E. NEVE ASSOCIATES , INC. DATE PROJECT: NABUSP SHEET OF HYDROGRRPH FOR SUBCRTCHMENT # 1 36 SUBCAT # 1 34 PERK = 32.7 ---------- 3e RAINFALL = S.5 AREA= 5.76 ACRES 28 CN= 92.8 26 AREA = 5.7E Tc= 10 24 CF•1 = 9�•8 RAINFALL= 6.5 INCHES v 20 - PEAK FLOW= 38.7 CFS 18 Tc = 10 VOLUME= 2.47 ACRE-FT 14 b- 12 10 8 6 4 0 0 1 1 13 13 14 15 16 17 18 19 L0 TIME (HOURS) HYDROGRRPH FOR SUBCRTCHMENT # 2 26 24 PERT: = 2'. 1 SUBCAT # 2 RAINFALL = 6.5 AREA= 4.01 ACRES 20 - 18 AREA = 4.01 .----- CN= 88.9 16 CN = 88.9 RAINFALL= 6.5 INCHES U 14 Tc - B PEAK FLOW= 27. 1 CFS 3 12 VOLUME= 1 .58 ACRE-FT 0 10 tL 8 ` 6 4 2 q0 11 12 13 14 15 16 17 18 19 20 TIME (HOURS)