Antrim Township Stormwater Management

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Slide 1

Antrim Township Stormwater Management Reviewing Engineer: Dewberry-Goodkind, Inc.

Slide 2

Review Process Primary Objective To affirm that the stormwater administration plan is in consistence with Chapter 126-Antrim Township Stormwater Management Ordinance Administrative Review 7 days after receipt of finish SDLD accommodation Technical Review 14 days after receipt of authoritatively entire stormwater administration arrange

Slide 3

Administrative Review Determine that outline counts and plan components including notes, points of interest, and so forth are given in the accommodation, adequate to finish a specialized audit Administrative Review Checklist Chapter 126 - Antrim Township Stormwater Management Ordinance Administrative survey gives off an impression of being the most tedious in the survey procedure.

Slide 4

Administrative Review Common Deficiencies Standard notes as required in Chapter 126 Calculations for ground water revive and water quality volumes gave by BMPs Calculations demonstrating sufficient disintegration insurance gave at open channel purposes of release Calculations showing that legitimate disintegration control measures have been given to secure storeroom spillway and bank against erosive impacts of quickened release Detailed soils assessment including porousness, profundity to bedrock and water table, susceptibilty to sinkhole development (bedrock sort) Address overflow from critical poison creating sources and give pre-treatment (in carbonate regions)

Slide 5

Administrative Review Common Deficiencies Address precluded associations and denied releases in SWM arrange (report or plans) Table (or different means) indicating sort and measures of impenetrable cover proposed, gave on the arrangement Hydraulic limit of open channels and tempest sewers gave on the profiles Clearly distinguish the proprietor of the SWM offices on the site

Slide 6

Technical Review Technical Review Checklist PADEP Stormwater Best Management Practices Manual, Dec. 2006 PADEP Erosion and Sediment Pollution Control Program Manual, March 2000 TR-55 Technical Release – Urban Hydrology for Small Watersheds Pennsylvania Handbook of Best Management Practices for Developing Areas 2000 Maryland Stormwater Design Manual

Slide 7

Technical Review Determine that outline counts are right, that arrangement components meet the prerequisites of the Ordinance and best building hone, that consequences of the computations are effectively portrayed on the arrangement components Technical Review Checklist Chapter 126 - Antrim Township Stormwater Management Ordinance

Slide 8

Technical Review PADEP Stormwater Best Management Practices Manual, Dec. 2006 http://www.depweb.state.pa.us/watershedmgmt/cwp/view.asp?a=1437&q=529063&watershedmgmtNav=| Design estimations, details, support of BMPs Site stormwater counts and philosophy Rational Method, NRCS Method (TR-55 or TR-20)

Slide 9

Technical Review PADEP Erosion and Sediment Pollution Control Program Manual, March 2000 Open Channel Design Anti-leak Collar Design Riprap Apron Outlet Protection Design

Slide 10

Technical Review TR-55 Technical Release – Urban Hydrology for Small Watersheds Hydrologic Soil Group assignment for different soils HSG assignment as gave in the Web Soil Survey will be acknowledged, given that the creator inspect the current webpage and give confirm that the current soil meets the portrayal of the HSG Time of focus/Travel time figurings

Slide 11

Technical Review Pennsylvania Handbook of Best Management Practices for Developing Areas http://www.pacd.org/items/bmp/bmp_toc.htm Additional reference for BMPs if PADEP Stormwater BMP Manual does not give adequate outline data

Slide 12

Technical Review 2000 Maryland Stormwater Design Manual http://www.mde.state.md.us/Programs/WaterPrograms/SedimentandStormwater/stormwater_design/index.asp Additional reference for BMPs if PADEP Stormwater BMP Manual does not give adequate plan data

Slide 13

Technical Review Miscellaneous Items 24-hour storm occasion precipitation profundities for use in NRCS strategies Figure B-3 in Exhibit 2 of Chapter 126 Will acknowledge more prohibitive precipitation forces (balanced strategy) or precipitation profundities, on the off chance that they are required by other exploring organizations (PADEP, Conservation District)

Slide 14

Technical Review Miscellaneous Items Design territory for groundwater revive BMPs is the waste zone to the BMP Design zone for water quality volume is the aggregate website region. Water quality volume is not required for offsite waste ranges that release onto the site.

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