O-83-1059 - 12/8/1983TEXAS, THAT
ORDINANCE NO.
a ..
/0.5Y
AN ORDINANCE AMENDING CHAPTER 8, SECTION 6.I.(2)
CODE OF ORDINANCES, CITY OF ROUND ROCK TO ESTABLISH
REQUIREMENTS FOR EROSION AND SEDIMENTATION CONTROL.
BE IT ORDAINED BY THE COUNCIL OF THE CITY OF ROUND ROCK,
I.
Chapter 8, Section 6.I.(2), Code of Ordinances, City of
Round Rock, Texas, is hereby amended by adding subsections
(e), (f) axe -4-gt which subsections shall read as follows:
(e) Open Sections
(i) Definitions:
Major stream - Drains 5 sq. miles or more
Major collector - Drains 20 acres or more
Minor collector - Drains less than 20 acres
(ii) Minor collectors shall be constructed with
underground storm sewers. If it can be
established by certified engineering date
to the satisfaction of the City Engineer
that storm sewers are not physically
feasible, open ditches may be used,
provided that such ditches are lined with
concrete or other permanent materials
accepted by the City Engineer. These
structures shall be of sufficient cross
section and slope as to fully contain
design flows and facilitate self cleaning.
Outfalls shall enter major collector
drainageways and major streams at grade or
be designed and constructed with adequate
concrete aprons, energy dissipators or
similar features to prevent erosion.
(iii) Major collector drainageways, dention
ponds, and related structures may utilize
either existing natural open sections which
may be modified, or newly constructed
facilities. If modified or newly
constructed facilities are utilized, they
shall be lined with permanent materials
including, but not limited to: concrete or
vegetation. Vegetated channels shall have
sufficient grade to provide velocities that
will allow self cleaning but will not be so
great as to create erosion. Side slopes
shall not be less than 3 to 1 to allow for
future maintenance and to promote slope
stability. All slopes shall be hydro -
mulched, sodded or seeded with approved
grass, grass mixtures or ground cover suit-
able to the area and season in which they
J
ATTEST:
are applied. Growth must be established
over 85% of applied areas prior to
acceptance of subdivision improvements by
the City, with no exposed area exceeding 10
square feet. "Established growth" shall
mean the vegetation has reached a height of
12" and is of a density where it can be
reasonably expected to be self sustaining.
(iv) Major Streams shall not be modified without
consent of applicable State and Federal
agencies and authorization from the
Director of Public Works.
(f) Sedimentation Controls
Brush berms, hay bales, sedimentation basins
and similar recognized techniques and materials
shall be employed during construction to
prevent point source sedimentation loading of
downstream facilities. Such installation shall
be regularly inspected by the City Engineer or
his designee for effectiveness. Additional
measures may be required if, in the opinion of
the City Engineer, they are warranted.
(Mark through the following alternative that is not appli-
cable)
Alternative 1.
By motion duly made, seconded and passed with an affirma-
tive vote of all the Council members present, the requirement
for reading this ordinance on two separate days was dispensed
with.
READ, PASSED, and ADOPTED on first reading this
day of .C./ , 19 d✓ .
Alternative 2.
READ and APPROVED on first reading this the day
of , 19
READ, APPROVED and ADOPTED on second reading this
the day of
NNE LAND, City Secretary
O I
L T Y L. TONN, Mayor
City of Round Rock, Texas