Stormwater permit. In addition to
site plan approval, a stormwater permit shall be obtained from the City Engineer prior to
building permit issuance. The stormwater permit application is available on the Transportation Services Department website or by calling the Department. See
Chapter 29: Sewer Usage and Administration,
Article VI: Stormwater, of the Code of Ordinances for additional stormwater regulations.
Items required to obtain a stormwater permit.
1. Site plans showing all existing and proposed stormwater improvements for the
site. The location and size of all existing and proposed surface and subsurface stormwater facilities shall be provided.
2. Stormwater calculations shall be provided to demonstrate compliance with the three primary requirements of the City's Stormwater Ordinance, listed below. Reference
Chapter 29: Sewer Usage and Administration of the City Code of Ordinances.
a. Flood protection.
b. Channel protection.
c. Water quality.
3. Grading plan showing existing and proposed topography of the site.
a. Properties less than or equal to one acre shall have one-foot contour intervals.
b. Properties greater than one acre shall have two-foot contour intervals.
4. Plan showing stormwater flow paths for the ten-year storm event and a storm event that exceeds the 100-year storm event.
5. Additional items as required by the City Engineer.
Basic stormwater standards.
1. Site plans shall comply with the City's Stormwater Ordinance (
Chapter 29: Sewer Usage and Administration) as well as the latest edition of the City's Stormwater Standards Manual.
2. Tulip City Inter-County Drain Board approval shall be obtained when the
site is located in the Tulip City Inter-County Drainage District.
Structural green infrastructure.
1. Structural green infrastructure shall be used to meet the Stormwater Ordinance to the greatest extent practicable, in the opinion of the City Engineer and the
approving authority. See
Article 39-6: Landscaping and Green Infrastructure and
Chapter 29: Sewer Usage and Administration of the Code of Ordinances.
2. A list of the structural green infrastructure best management practices (BMPs) to be used shall be provided in the required written project summary submitted with the
site plan application.
Retention and detention pond amenities shall be incorporated into the overall
site design by designing them to provide
site amenities. Specific
site design elements shall be reviewed to determine if, in the opinion of the City Engineer and the
approving authority, the proposed
amenity and the location of the pond meets the intended benefit.
See
Article 39-6: Landscaping and Green Infrastructure.
Green infrastructure and stormwater management site design requirements.
A. Intent. To meet the City of Holland's sustainability and resiliency goals,
development needs to diversify the ways that stormwater runoff is collected, infiltrated, stored, and treated. Continued reliance solely on conventional infrastructure (water runoff into pipes and ponds) has proven to be unsustainable, especially with an increase in large storms and built
development. The use of green infrastructure best management practices (BMPs) has proven to be effective in working in conjunction with conventional infrastructure to mimic natural processes and to meet low-impact development site design.
B. Chapter 29: Sewer Usage and Administration and UDO relationship. Most
developments shall be required to obtain a stormwater permit from the City Engineer in addition to obtaining
site plan approval.
Chapter 29: Sewer Usage and Administration,
ARTICLE VI: Stormwater in the City's Code of Ordinances provides specific engineering standards to meet the ordinance and obtain a stormwater permit and references the
applicant to the City of Holland's Stormwater Standards Manual for additional stormwater designs and details.
C. This section of UDO requires the
applicant to meet the Stormwater Ordinance requirements in specific ways that are critical for site design and achieving low-impact development goals. The two ways these requirements do this are through the use of structural green infrastructure best management practices and by making retention and detention ponds
amenities in addition to being used for stormwater storage.
D. Structural green infrastructure requirement.
1. Structural green infrastructure best management practices (BMPs) shall be used to the maximum extent practicable to comply with the
Chapter 29: Sewer Usage and Administration, the adopted Stormwater Standards Manual, and to obtain a required stormwater permit. Credits are provided when using green infrastructure BMPs to meet the Stormwater Ordinance and are determined through stormwater permit calculations.
2. Nonstructural BMPs are encouraged to be used in addition to using the required structural green infrastructure BMPs.
3. Additional best practices include managerial and certain other structural and nonstructural BMPs that are encouraged to be used in addition to the required structural green infrastructure BMPs.
These are listed in
Sec. 39-6.08: Additional best practices.
