(A) Purpose
and Intent.
The City has adopted a stormwater program
as part of its Texas Pollutant Discharge Elimination System (TPDES)
permit. The intent of the program is to proactively promote integrated
site design principles and stormwater controls that will minimize
the hydrologic impact of development and redevelopment on stormwater
quantity and quality. Storm drainage facilities must comply with the
City’s Technical Standards.
(B) Applicability.
This Division 1 is applicable to all new developments and significant
redevelopment projects that consist of land disturbance greater than
or equal to one acre, and to a land disturbance area of less than
one acre if the activity is part of a common plan of development that
is one acre or larger. The developer of a project submitted to the
City for approval on or after the effective date of this GDC shall
comply with the provisions of this Division 1.
(Ordinance 6773 adopted 5/19/15)
A Schematic Stormwater Plan (SSP) shall be submitted to the City for review prior to submission of a site permit that involves construction pursuant to Section
3.61(B) above (whichever occurs first). Schematic Drainage Plan requirements are in the Technical Standards, and basic information regarding the site shall be provided including, but not limited to, the following:
(A) An engineer-scaled
drawing showing the topography of the property on and within fifty
feet of the development.
(B) An estimate
of the proposed increase/decrease in pervious area.
(C) Existing
and proposed drainage patterns, storm sewer layout, sizes, inlets
and retaining walls on the site.
(D) One-hundred-year
runoff entering and leaving the site and disposition of the stormwater
runoff before and after development.
(E) Existing
stormwater controls on the site.
(F) A brief
description of any proposed stormwater controls that will be designed
for the site (such as whether runoff will be conveyed through a storm
sewer system, whether there be a detention pond(s), or whether runoff
will be conveyed to an existing system). The description must show
the location and preliminary sizing of off-site improvements required
to connect to the public drainage system, including any easement needs
where applicable.
(Ordinance 6773 adopted 5/19/15; Ordinance 7055, sec. 20, adopted 5/7/19; Ordinance 7107, sec. 46, adopted 12/3/19)
(A) General.
If a development will contain excess parking as a feature of stormwater control, the development must comply with the provisions of this Section. If a development is subject to the detention requirements under Section
3.89 of this Article 5, then meeting the detention requirements of that Section will fulfill the requirements of this Section.
(B) Excess
Parking Requirements.
For some types of developments,
this GDC specifies a maximum allowable number of parking spaces. Parking
areas in excess of the maximum number allowable for the particular
type of development shall be graded toward the perimeter landscaping
buffer or islands, and shall drain across pervious areas to provide
water quality treatment before being routed to a conveyance system.
Pervious areas may include naturally occurring buffers or undisturbed
areas, lawns, landscaping, filter strips, parking lot islands, bioretention
areas, and enhanced swales, or excess parking areas may be drained
toward an approved stormwater control as listed in the Technical
Standards.
(C) Alternative
Requirements.
A development shall be required to double the minimum required landscaping, in landscape area square footage and shrubs/trees, on the site of the development if Subsection
(B) above is not at least partially fulfilled. If Subsection
(B) above is at least partially fulfilled, the additional landscaping requirement of this Subsection will be prorated based upon the amount of parking and rooftop areas that do meet the requirements of Subsection
(B). Landscaping requirements are found in Article 3 in Chapter
4 of this GDC.
(Ordinance 6773 adopted 5/19/15)