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Home My WebLink About34 Development Permit 487 Peace Luthren Church ImprovementsDEVELOPMENT PERMIT PERMIT NO. 487 PEACE LUTIIERAN CHURCH IMPROVEMENTS FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: Southwood Valley Section 10-A Block 36 OWNER: Peace Lutheran Church 2201 Rio Grande College Station, Texas 77845 693-4403 DRAINAGE BASIN: Bee Creek Tributary "B" TYPE OF DEVELOPMENT: SITE ADDRESS: 2201 Rio Grande This permit is valid for site construction as shown on the approved construction documents. The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition, placement and state. The Owner and/or Contractor shall be responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equipment as well as erosion, siltation or sedimentation resulting from the permitted work . Any trees required to be protected by ordinance or as part of the landscape plan must be completely fenced before any operations of this permit can begin. In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities . I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and or~nances o Cit): C lege Station that apply. Date Contractor Date •' J ~ ' . •' . . ' ,. :. I DRAINAGE ANALYSIS FOR PROPOSED IMPROVEMENTS PEACE LUTHERAN CHURCH 2201 RIO GRANDE DRIVE COLLEGE STATION, BRAZOS COUNTY, TEXAS APPROVED FOR CONSTRUCTION AUG 1 5 1997 COLLEGE STATION Et;J<jlNEERING 11/ V /7 / .tV . t ~.t/.A?~- 1 7 AUGUST, 1997 Submitted By: - Michael G. Hester, P.E . Hester Engineering company 7607 Eas t mark Drive, Suite 253-B College station, TX 77840 (409)693-1100 fX:(409)693-1075 CERTIFICATION I hereby certify that this report and accompanying drainage plan for the drainage design was prepared by me in accordance with the provisions of the Cities Drainage Policy and Design Standards for the owners thereof. PEACE LUTHERAN CHURCH ·CERTIFICATION INTRODUCTION: DRAINAGE ANALYSIS PROPOSED IMPROVEMENTS PEACE LUTHERAN CHURCH 2201 RIO GRANDE BOULEVARD COLLEGE STATION1.., TEXAS AUGUST, 1991 Peace Lutheran Church is an existing church complex located at the northeast corner of Rio Grande Boulevard and Airline Drive in College Station, Texas_ The legal description is Southwood Valley Section 10-A Block 36. The tract is recorded in the Brazos County Deed Records, Volume 404, Page 789. The site zoning is R-6 and a conditional use permit for the improvements has been submitted. The proposed improvements consist of additional class rooms (3625 square feet) that will be connected to the existing church structure. This report includes the future development of an additional 3575 square feet which brings the ultimate development to 7200 square feet (0.17 acres). The architect preparing the site and grading plan is Mr. Jim Holster, AIA, Holster & Associates, 7607 Eastmark, Suite 200, College Station, TX 77840 (409) 693-3179. The contact person for the church is Mr. Charles Coble at (409)693-4403. EXISTING DRAINAGE BASIN DESCRIPTION: The church site is a portion of a 21.2 acres drainage basin which drains to Bee Creek Tributary 11 B 11 • The terrain slopes in a southwest direction to an open ditch along F.M. 2818 . From there it travels along F.M. 2818 to Bee Creek Tributary B, Basin Reference No. 5, Regulatory Channel Reach No. I which is a primary drainage system with no "Special Drainage Basin and Channel Reach Design Standards" per the College Station "DRAINAGE POLICY AND DESIGN STANDARD", other than the elevation of lowest PEACE LUTHERAN CHURCH -PAGE 1 OF 3 PAGES habital floor is Base Flood plus 2 feet (page 11) -The latest Federal Emergency Management Agency Flood Insurance Rate Maps show that no portion of the site is in the regulatory 100-year flood plain. PROPOSED DRAINAGE: The improvements will route the runoff in the same direction to the open ditch along F.M. 2818 and to Bee Creek Tributary B. Detention is not required by ordinance nor planned for the site because the runoff generated by the improvements will be maintained in the open ditch section along F.M. 2818 and will not increase the level of the water surf ace elevation of Bee Creek Tributary B. DRAINAGE CALCULATIONS: A cross section of the open ditch along F.M. 2818 was evaluated to determine any significant change in the water surface elevation due to the proposed ultimate improvements. The ultimate improvement QlOO storm water flow increased 0.24 cubic feet per second (cfs) from 106.97 cfs to 107.21 cfs and did not raise the water surface along the F.M. 2818 open ditch and therefore will not have an impact upon any downstream property owners. The QlOO ultimate discharge for Bee Creek Tributary B at river station 0.63 is 4936 cfs. This information was taken from College Stations "DRAINAGE SYSTEM ANALYSIS", Table III-6, page PEACE LUTHERAN CHURCH -PAGE 2 OF 3 PAGES 32. Adding an additional 0.24 cfs to this flow will not increase the water surface elevation. Predevelopment discharges for the 100 year storm for the analysis were determined using the Haestead Methods Quick TR - 55 rational method for computing runoff hydrographs. Detailed calculations are contained in PREDEVELOPMENT CONDITIONS. Post-development discharges were determined utilizing the same hydrography methodology. Detailed calculations are contained in POSTDEVELOPMENT CONDITIONS. CONCLUSION: This project is in compliance with the City's Stormwater Design Standards. PEACE LUTHERAN CHURCH -PAGE 3 OF 3 PAGES t Nt::s N / ) PE/r.CE UJrt1EK/tN Ct1UKC/1 L-OC,A,T/O N t1 ,A,P PEltCE LUTHER ltN CHURCH 2201KIO6Klr.NDE COL-L-E6E 5Tlr.T/ONJ TEX,A,5 lr.U6U5TJ /99/ PR'EP/tR'ED e>Y: t1E5/ER' ENGINEERING COHP/tNY 7007 Elt5/HltR'/:.. DR'!l/E, 5UllE 2'55-e> COLLEGE 51 It/ION, rx 1184-0 <4-09)059-1100 FX:<4-09)095-10!'5 ef'?ail: hec2000caol.cof'? DRAINAGE MAPS PEACE LUTHERAN CHURCH ' t?RAINAal:: ARl::A MPP PfACf L-UfHf RAN CH URCH 2201 1<10 aRANor:: BL-VD. COL-L-E:Ci l:: 51 A fl ON, BRAZOS CO UNIY, f'[::XA5 AUC1U51, 1991 5CAL.c;: I 11-'?00' PRE:P ,ARI;!? l?Y: Ht::5-rt:R t::NulNt::t::RINCi COMP.ANY 1601 fA5fWRK l?Rl\lf , 5Ulff 2?~-1? COL.l-fc.if 5fA110N, fl< 77840 C 409) 6~9-1100 PX :C 409) 6~9-101 ? email: hec2000@aol.com I N ~ x k ~269.0 fr & 269.7 .QJ Subs t ati on ~6 .0 x --'x 275 .6 ' t?RAINMI:: AReA WP Pl::AG'.: L.UIHl::RAN CHURCH ~ 2201 RIO CiRANt?I:: BL. Vt?. 286 ·3 COL.L.l::Cil:: 5fA110N, BRAZ05 COUNIY, fl::XA5 .AU'.AU5f, 1991 P!<fPMt? BY: 1::5-n::R l::NCilNl::l::RINCi COMPANY 1601 E:A5fMARK t?RIVE'.. 5Ulre 2?:?-B COL.L-E:ut:: 5fA110N. 1X 11840 C 409) 6:?9-ll CX> FX:C 409) 6:?9 -101? email : r..c2CX>O@aol.com • PREDEVELOPMENT CONDITIONS PEACE LUTHERAN CHURCH • Quick TR-55 Ver.5.44 Executed: 07:27:58 S/N:l315430080 08-11-1997 PEACE LUTHERAN CHURCH 2201 RIO GRANDE BLVD. PREDEVELOPMENT CONDITIONS (21.2 ACRES) * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. OVERALL Runoff IC' 0.700 Area acres 21.20 Tc (min) Wtd. 'C' 26.70 0.700 RETURN FREQUENCY = 100 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 Adj. I 'C' in/hr 0.700 7.208 Total acres 21.20 Peak Q (cfs) 106.97 POSTDEVELOPMENT CONDITIONS PEACE LUTHERAN CHURCH Quick TR-55 Ver.5.44 Executed: 07:30:57 S/N:1315430080 08-11-1997 PEACE LUTHERAN CHURCH 2201 RIO GRANDE BLVD. POST DEVELOPMENT CONDITIONS (21.2 ACRES) * * * * * * SUMMARY OF RATIONAL METHOD PEAK DISCHARGES * * * * * * Q = adj * C * I * A Where: Q=cfs, C=Weighted Runoff Coefficient, I=in/hour, A=acres adj = 'C' adjustment factor for each return frequency Subarea Descr. Runoff IC' OVERALL 0.700 IMPROVEMENTS 0.900 Area acres 21.03 0.17 Tc (min) Wtd. 'C' 26.70 0.702 RETURN FREQUENCY = 100 years 'C' adjustment, k = 1 Adj. 'C' = Wtd.'C' x 1 ========================= ======== Adj. I 'C' in/hr 0.702 7.208 Total acres 21.20 Peak Q (cfs) 107.21 F.M. 2818 OPEN DITCH CROSS SECTION CALCULATIONS PEACE LUTHERAN CHURCH PEACE LUTHERAN CHURCH PREDEVELOPMENT Worksheet for Irregular Channel Project Description Project File c :\haestad\fmw\peace .fm2 Worksheet PEACE LUTHERAN CHURCH Flow Element Method Solve Fo r Irregular Channel Manning's Formula Water Elevation Input Data Channel Slope 0.010000 ft/ft Elevation range : 274 .00 ft to 280 .00 ft . Station (ft) Elevation (ft) Start Station 0 .00 0.00 280 .00 20 .00 278 .00 39 .00 276 .00 48 .00 274.00 57 .00 274 .00 125 .00 274 .50 198 .00 276 .00 260 .00 278 .00 342 .00 280 .00 Discharge 106.97 cf s Results Wtd . Mannings Coefficient Water Surface Elevation Flow Area Wetted Perimeter Top Width Height Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow is subcritical. 0.040 274 .78 ft 46 .26 ft 2 94 .18 ft 94.09 ft 0.78 ft 274.61 ft 0.032629 ft/ft 2.31 ft/s 0.08 ft 274 .86 ft 0.58 End Station 342 .00 Roughness 0.040 08/11/97 07:49 :50AM Haestad Methods , Inc . 37 Brookside Road Waterbury , CT 06708 (203) 755 -1666 FlowMas ter v5 .13 Page 1 of 1 PEACE LUTHERAN CHURCH POST DEVELOPMENT Worksheet for Irregular Channel Project Description Project File c :\haestad\fmw\peace.fm2 Worksheet PEACE LUTHERAN CHURCH Flow Element Irregular Channel Method Manning's Formula Solve For Water Elevation Input Data Channel Slope 0.010000 ft/ft Elevation range : 274.00 ft to 280.00 ft . Station (ft) Elevation (ft) Start Station 0.00 0.00 280.00 20 .00 278 .00 39 .00 276 .00 48 .00 274 .00 57 .00 274.00 125.00 274.50 198 .00 276 .00 260 .00 278 .00 342 .00 280 .00 Discha rge 107.21 cf s Results Wtd . Mannings Coefficient Water Surface Elevation Flow Area Wetted Perimeter Top Width Height Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow is subcritical. 0.040 274.78 ft 46 .33 ft2 94 .22 ft 94.13 ft 0.78 ft 274 .61 ft 0.032615 tuft 2.31 fUs 0.08 ft 274 .86 ft 0.58 End Station 342 .00 Roughness 0.040 08 /11/97 07:50 :46AM Haestad Methods , Inc . 37 Brooks ide Road Waterbury , CT 06708 (203) 755 -1666 FlowMaster v5.13 Pag e 1 of 1 Project Description F.M. 2818 OPEN DITCH SECTION Cross Section for Irregular Channel Project File c:\haestad\fmw\peace .fm2 Worksheet PEACE LUTHERAN CHURCH Flow Element Irregular Channel Method Manning's Formula Solve For Water Elevation Section Data Wtd . Mannings Coefficient Channel Slope 0.040 0. 01 0000 ft/ft Water Surface Elevation Discharge 274 .78 ft 107.21 cfs 280 . -------------T-------------,--------------r-------------,--------------r-------------T-----------, I I I I I I I I I I I I I I I I I I I I I I I I I I I I ----------t-------------~--------------~-------------i--------------~-------------------------~ I I I I I I I I I I I I I I I I I I I I I I I I I I I I 278 .0 -------~-------------~--------------~-------------~--------------~-----------~-------------~ I I I I I I I g I I I I I I -I I I I I I I I I I I I § 277 .0 -----~-------------~--------------~-------------~------------~-------------!-------------~ :P I I I I I I I ro I I I I I I I ~ 276 .0 ----------__ j _____________ J ______________ l------------: ______________ l-------------1-------------J 08/11/97 09 :25 :31 AM I I I I I I I I I I I I I I I I I I I I I I I I I I I I 275 .0 ------------t-------------~--------------------------~--------------~-------------+-------------~ W I : : : : I I I I I I I I 274 .0'-----------------~--....::;;;;.... ____ __..__ __________ ....._ __________ __. ____________ ....._ __________ _.. __________ ___, 0.0 50 .0 100 .0 150 .0 200 .0 250 .0 Station (ft) Haestad Methods , Inc. 37 Broo ks ide Road Waterbury , CT 06708 (203 ) 755 -1666 300 .0 350 .0 FlowMaster v5 .13 Page 1of 1 / r ACCOUNT NO ·------------------- CITY OF COLLEGE STATION 3 9 914 7 ~:::=--~---1...L---. 1f\l " F ·..,_ Figure Xll Dev elopment Permit City of College Station, Texas Site Legal ~cription ~ ~, ~C:f, lo-A ~ 3G Site Owne . Zk.c Lin~ Ctdur'2-Ct.-!-Address (2'2o\ ~ ~ C .';, Telephone: ~""'t "'!::> -L:14o3 Architect/~ Se Engineer :~ V: Date Application Filed : C;?• \ \ :"11 l'9o 1. ~r-rrr--f'Kf2-V-§ 26 "$ • B Addr~ss : C . S. . :tp. '7'7 t54o Telephone No : G°i\ ~ .-t l(!:n.? ' Address : ------------- Telephone No : ---------- Approved : ------------ Application is hereby made fc?r the following development specific waterway alterations : o~E'" -@ Application Fee "\:] Signed Certifications -@ Drainage and erosion control plan, with supporting Drainage Report two (2) copies each. ---6:1 Site and Construction Plans, with supporting Drainage Report two (2) copies each. D Other: ------------------------------ >"ACKNOWLEDGMENTS : I, '/Vi. ~l:zt1...lf k (., · HEST~1~esign engineer/owner, hereby acknowledge or affirm that: The information and conclusions cl ntained in the above plans and supporting documents comply with the current requirements of the City of College Station, Texas City° Code, Chapter 13 and its associated Drainage Policy and Design Standards . As a condition of approval of this permit application, I agree to construct the improvements proposed in this application according to these documents and the requirements of Chapter 13 of the College Station City Code. Property Owner(s) Contractor Figure XU Continued CERTlFlCATIONS : (for proposed alterations within designated flood hazard areas.) A . I, \AA ~ t=brrtn--, certify that. any nonresidential structure on or proposed part of this application is designated to prevent damage to the structure or its offlo?{1ing from the 100 year stonn . . f& ~G. ~v_'·_tl_~~l ~~~~~ Date - B . l , certify that the finished floor elevation of the lowest floor, including any basement, of any residential structure, proposed as part of this application is at or above the base flood elevation established in the latest Federal Insurance Administration Flood Hazard Study and maps, as amended . · Engineer Date C . I, V'A, ~I.. Gr ~ify that the alterations or development covered by this permit shall not diminish the flood-c rying capacity of the waterway adjoining or crossing this permitted site and that such alterations or development are consistent with requirements of the City of C e Station City Code, Chapter 13 concerning encroachments of flood ways and of floo wa~ fr. ng Pc Conditions o_r comments as part of approval : -------------------- In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage facilities . I hereby grant this permit for development. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer for the above named project . All of the applicable codes and ordinances of the City of College Station shall apply .