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STORMWATER RUNOFF THROUGH THE RB'ARIAN BUFFER Stormwater mmff into the
riparian buffer shall men dirpersd flow as defined in 15A NCAC 02H .1002 except as otherwise
described in this Item. Oraimge conveyances include drainage ditches, roadside eiteMs, and
stormwarer commonness. The following stormwater conveyances fhrough the ripening buffer are
either deemed allowable or allowable up0u authorization, as defined in Sub -Item (9)(a) of this
Role, provided that they do not erode through the riparian buffer and den not cause erosion to the
receiving waterbody. Stormwater conveyances through the riparian buff that are not listed below
shall be allowable with exception as defined in Sub-Item(9)(apv) of Six Role:
(a) The following are deemed allowable as defend in Sub-Imam(9)(a)(i) of this Sale:
(i) New drainage conveyances firing a Primnry SCM, as defined in 15A NCAC 02H
.1002, when the Primary SCM is designed to treat the drainage area to the
conveyance and flat comply with a stormwater management plan reviewed and
approved under a state st0rmwater program or a stateapproved local
goverment stmmwater program; and
(it) New stermwater flow to existing drainage conveyances provided that the
addition ofnew flow does not result in the need to after dre conveyance.
(d) The flluwivg am allowable upon authorisation as defined in SubBeg(9)(apii) of die
Rafe:
(i) New drainage conveyances firm a Primary SCM as def d in 15A NCAC 02H
.1002 when the Primary SCM is provided to treat the drainage area t0 eae
conveyance bat ea rot required to be approved abler a state germander
program or a stat"pproved Insist government seam esome program;
(u) New drainage conveyances when the flow rate of the conveyance is less then 0.5
cubic feet per second during the peak flow from the 0.75 inch per hour storm;
(in) New astronomer mmff0at has been treated through a level spreader filter strip
then complies with 15A NCAC 02H .1059;
(iv) Realignment of existing roadside drainage conveyances applicable as publicly
faded and maintained greater Incorporation facilities when retaining or
improving the design dimensions provided fast n0 additional travel Imes are
added and the minimum required roadway typical section is used based on
traffic and safety considerations;
(v) ¢mligament of existing drainage conveyances rnaitwg or improving the design
dimensions provided that de size: of the drainage anee and the percent built upon
again wrfin the drainage area amain the same;
O New or uttered drainage conveyances applicable to publicly fled and
mairmined Iin•,, transportation facilities provided that SCMs, or BMPs form
the NCOOT Stormwater Best Management Practices Tw1Mx, are employed;
(vu) New drainage conveyances applicable t0 publicly fimdd and realnteiml firran
transportation Edifies east do rot provide a stomrwafer management facility
due to topography canvtraints provided other measures are employed t0 prOrect
do stream water quality t0 the maximum extent practical; and
(viii) New drainage conveyances where the drainage area to the cmveyance box w
new bullf-upon area as defined in I5A NCAC 02H .1002 and the conveyance is
necessary fro bypass of existing drainage only

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