FLOOD CONTROL DETENTION PLAN REVIEW CHECKLIST November, 2008

Transcription

1 FLOOD CONTROL DETENTION PLAN REVIEW CHECKLIST Office Use: Case N: Review Date: Reviewer: Detentin Plan Review Checklist This Plan Review Checklist is designed as a tl t assist the design engineer and review engineer in submitting a cmplete set f plans fr detentin. This checklist is nt intended t be a cmplete listing f all applicable requirements but is nly a cllectin f the mst cmmnly required items. It is the respnsibility f the design engineer t btain all applicable design standards and use gd engineering judgment in preparing cnstructin plans. TABLE OF CONTENTS: PAGE # SECTION 1 DESIGN STANDARDS Overland Park Municipal Cde Other City Standards Referenced Standards... 2 SECTION 2 SUBMITTALS Initial Submittals Final Submittals fr Permitting Fees Paid Prir t Permitting... 3 SECTION 3 CONSTRUCTION PLANS Cver Sheet Drainage Plan, Map and Calculatins Strm Sewer Prfiles Detentin Site Grading Plan Detentin Basin Design Detail sheet(s) Miscellaneus Items / Other Permits

2 Page 2 SECTION 1 DESIGN STANDARDS The fllwing is a listing f applicable design standards fr typical residential subdivisins in Overland Park. Depending n prject specific circumstances, ther standards may apply: 1.1 Overland Park Municipal Cde: Chapter Strmwater Management Prgram Standards and Permitting Chapter Strmwater Treatment 1.2 Other City Standards and Plicies: Design Criteria Strmwater Cnveyance Facilities City f Overland Park Overland Park Standard Details Strmwater Management Studies (ES Plicy #3-01) 1.3 Referenced Standards: SECTION 2 SUBMITTALS 2.1 Initial Submittals 2.2 Final Submittals KC Metr APWA Divisin V Design Criteria Sectin 5600 Strm Drainage Systems and Facilities (APWA 5600) MARC and KC Metr APWA Manual f Best Management Practices fr Strmwater Quality, March 2008 Tw (2) plans submitted n 22" x 36" r 24" x 36" sheets Final Strmwater Management Reprt (sealed) 2 sets (unless previusly submitted with ther plans) Wrk in Special Fld Hazard Areas Submit separate applicatin/checklist fr a Fldplain Develpment Permit Sealed by a Kansas Prfessinal Engineer (At a minimum, riginal set. Additinal sets may be cpies.) Five (5) full-sized sets fr distributin

3 Page Fees paid prir t permitting: Easement/legal dcument recrding fees if applicable SECTION 3 CONSTRUCTION PLANS 3.1 Cver Sheet Prject title agrees with plat name Signature Blck. Apprved By: Administratr, Engineering Services Divisin / Date DET Case Number and related ESR/PRS case number Index f Sheets General Lcatin Map Legal Descriptin (i.e.-lt#, Tract, r Plat ID) General Ntes Benchmark Data and datum Develper/Owner (name/address/phne number) Utility Cntacts and phne # s Legend 3.2 Drainage Plan, Map, and Calculatins Scale: 1 =100 r larger fr nsite areas (smaller scale allwed fr large ffsite drainages) Existing/Prpsed Cnturs shwn All nsite/ffsite drainage areas shwn N significant drainage basin shifting allwed

4 Page 4 Strm sewer system extended apprpriately: 2 acres maximum drainage area tributary t first uppermst inlets in system Extended t undevelped upstream prperty lines fr future service Public vs. Private strm sewer system clearly labeled Public Strm sewer system minimizes length under pavement Existing/prpsed strm sewers shwn Strm sewer structures: Structure Numbers labeled Statining shwn Adequate side clearance fr pipes (see Inlet Bx Sizing Chart) 4 ft minimum length and width Setback curb inlets nt allwed adjacent t parking areas Private Strm Sewer System Design: Enclsed system - 10% design strm; Minimum 4% frequency design fr crss rad pipes and culverts at cllectrs and thrughfares 1% Strm verflw system prvided 7-inch maximum depth in parking lts and private drives (1% strm) Cannt cause backwater nt adjacent prperty fr 1% and lesser strm event Must discharge t apprpriate dwnstream drainage system cannt shift, cncentrate, r increase drainage area t adjining prperty unless adequate strm sewer facilities are available Must be cnstructed t public strm sewer standards Drainage Table: 10% design strm 1% design strm verflw system (1 ft freebard required t any building penings) Tc based n 100-ft maximum verland flw length (Calcs req d fr Tc> 5 min) Runff Cefficient C cnfrms with APWA Sectin Undevelped areas - Use City Future Develpment Plan land uses t determine future runff cnditins Pipe System design strm Hydraulic Grade Line (HGL) at each inlet shwn HGL must remain 0.5 ft belw bttm f thrat pening fr design strm. 3.3 Strm Sewer Prfiles Structures: Inverts/tp elevatins indicated 4-ft minimum length and width 4- ft minimum structure depth (tp t lwest invert ut). Tp f pipe desn t encrach int inlet thrat

5 Page 5 If L+H r W+H >20 feet a structural design required Adequate vertical drp (0.2 ft min fr straight thrugh (<22 degrees) flws, 0.5 min fr ther cnditins including multi-inflw pipes, size transitins etc) 8-ft maximum curb inlet width. Pipe prfiles: Prfile required fr strm sewers with tw r mre pipe runs Line length, slpe, inverts, and tp elevatins indicated Fr structures with tw r mre pipe cnnectins prvide pipe rientatin Existing/prpsed grund line indicated Minimum cver 18 inches (APWA ) Class III RCP r HDPE pipe (24 DIA and smaller nly) required (CMP allwed) Cver exceeding 12-feet Check if Class IV pipe is required fr due t earth lads Maximum pipe run length 500 ft (APWA ) End sectins draining int enclsed system include prtectin grate fr 24-inch and larger pipes Outlets Grade fr psitive drainage shwn Flwline indicated fr end f pipe AND end sectin Outlet prtectin adequate (see Riprap Design Chart) Last pipe sectin at minimum slpe pssible t reduce utlet velcity (3 fps minimum velcity) Discharges t natural streams meets APWA requirements (lcatin/skew etc) Discharges t lakes/pnds at nrmal pl elevatin (n submerged/elevated utlets) 3.4 Detentin Site Grading Plan Scale (1"=50' r larger) and Nrth arrw Setback requirements: away frm Buildings, Prperty Line, Embankment ut f ROW, access path slpes cnfrm with KCAPWA Sectin 5600 and O.P.M.C. Chapter Cntur lines: Existing/Prpsed shwn with different line weights Minimum f 50 feet beynd prperty line - r as necessary t shw drainage patterns Detentin Basin Slpes: Maximum 3:1, if side slpes exceed 5:1 then safety measures shall be prvided including but nt limited t fence n all sides.

6 Page 6 Minimum drainage slpes: Grass areas, 2.5% Asphalt area, 1% Cncrete areas, 0.5% Vertical retaining walls may be used if basin is fenced and a means f egress is prvided fr maintenance. Retaining walls subject t review by Planning and Building Safety Departments. Dam Embankment fill sil cmpactin specified. 3.5 Detentin Basin Design Final Strmwater Study and cnstructin plan crrespnd fr: Drainage plans crrespnd Basin stage-strage n the plans match the final study. Orifice sizes match Offline detentin is prvided with n direct discharge int basin. Fr Water Quality Detentin, see KCAPWA/MARC BMP Manual fr recmmended design. Primary Discharge is int an acceptable strmwater cnveyance facility. Undergrund strage: Vented Adequate access fr maintenance / cleaning f vault and rifice. Structurally Designed fr H-20 ladings. Wet bttm basins: Minimum depth f 4 feet (10 feet fr fish) Ersin cntrl n banks at permanent pl elevatin. Prvisins fr draining pl within 72 hurs Private lake agreement required Sediment Frebay sized per KCAPWA Figure and MARC BMP Manual fr Wet Extended Detentin prvided. Aeratin prvided Parking lt detentin: Maximum depth f 7 in parking lts. Sltted drains fully encased in cncrete. Required detentin parameters prvided n the plans: Ttal site area, ac Ttal area t basin, ac Off-site area t basin, ac Percent impervius f ttal site, Pre-develped, % Percent impervius f ttal site, Pst-develped, %

7 Page Detail Sheet(s) Percent impervius f area t basin, Pst-develped, % Percent impervius f ff-site area t basin, Pst-develped, % Strage vlume at verflw, cf Water elevatin at 100-year strm, cfs Release rate, 5-year strm, cfs 5-year Design strm, duratin & distributin 100-year Design strm, duratin & distributin Orifice type and area, sf Stage-strage curve prvided n the plans Stage-utflw curve prvided n the plans Inflw and utflw hydrgraphs Orifice Design Orifice is crrect size Orifice plate is stainless steel, aluminum, r ASTM A-123 galvanized with stainless steel fasteners, and sealant. Accessible trash rack n rifices smaller than 8 diameter. Orifice is installed n the utlet pipe f the utlet structure. Outlet rifice nt impaired by tailwater. N mechanical devises used. Orifice plate can fit thrugh access pening fr future remval/replacement. Primary Spillway Design is sized t rute the 1% strm thrugh the detentin basin with ne-ft f freebard t the Auxiliary Spillway. Auxiliary Spillway Design Auxiliary spillway sized t pass the full 1% strm with ne-ft freebard between spillway WSE and tp f berm. Ersin cntrl prvided n the auxiliary spillway when velcities exceed 5 fps. Crss-sectin f Auxiliary Spillway including 1% strm design capacity, flwline elevatin, 1% WSE, and tp f berm elevatin. Crss-sectin f dam including any cmpactin requirements Anti-seep cllars 3.7 Miscellaneus Items / Other Permits Easement Submittal:

8 Page 8 Drainage easements (dedicated t the City f Overland Park): Onsite strm sewer easements t cver thse prtins f the line nt previusly dedicated per plat. Offsite strm sewer easements. Temprary cnstructin easements: Easements fr ffsite cnstructin assciated with the prject. Prvide cpy f executed easement r written permissin. Recrding fees. Certificatin f basins required prir t btaining Certificate f Occupancy. Final Plat Recrded. Maintenance Agreement recrded Other regulatry permits: KDHE Permit (if ver 1 acre disturbed). Ntify applicant f requirement and btain cpy f permit applicatin. Kansas Department f Agriculture Divisin f Water Resurces (DWR) Needed when wrking in the fldplain r in streams with greater than 240- acre drainage area. A State permit fr the dam is required if the dam/impundment exceeds the fllwing: If the Dam is 25 feet r higher (frm te t tp f dam) If the dam is between 6 and 25 feet high AND it impunds 50 acre-feet f water MEASURED AT THE TOP OF DAM Additinally, a water rights permit is required if the dam impunds >15 acre feet f strage at the PERMANENT POOL Ntify applicant f requirement and btain a cpy f the permit applicatin. Verify that COE Sectin 404 permit requirements have been satisfied (unless already cmpleted with PC develpment plan apprvals). Unless the site has n identifiable streams r drainageways, btain ne f the fllwing: Cpy f valid COE Sectin 404 permit (verify that descriptin and dates are valid). Letter frm applicant indicating that n Waters f the U.S. are impacted by prpsed cnstructin. Grading in FEMA fldplain Apprved Fldplain Develpment Permit required prir t issuance f permit. (See plicy dcument FLOODPLAIN REGULATION fr mre infrmatin). Cpy f KDOT permit if in state right-f-way.