HomeMy WebLinkAboutCouncil Memo - Irrigation Standards 9.6.16MAYOR AND COUNCIL COMMUNICATION
DATE: 9/6/16
CONSENT
ITEM #: 7
MOTION
AGENDA ITEM: 5th Street/City Owned and Maintained Irrigation Standards
General Development Irrigation Standards
SUBMITTED BY: Stephen Wensman, Planning Director
REVIEWED BY: Kristina Handt, City Administrator
Stephen Mastey, Consulting Landscape Architect
Jack Griffin, Focus Engineering
BACKGROUND:
The City Council reviewed the Irrigation Standards on June 6, 2016 and at the time generally accepted the
5th Street Irrigation Standards, but directed Staff to revise the General Development Irrigation Standards
to only address the points of water connection to protect the basic health and safety of the water supply.
The revised Standards have been attached to this report for City Council’s approval.
ISSUE BEFORE COUNCIL:
To approve the 5th Street/City Owned and Maintained Irrigation Design Standards and General
Development Irrigation Design Standards.
PROPOSAL DETAILS/ANALYSIS:
Since June 6th City Council review of the Standards, the 5th Street Standards have been renamed to City
Owned and Maintained Irrigation Standards such that they can be used for future City owned and
maintained systems as needed. There have been a typo corrections and a few changes to the language, but
the basic requirements of the system have not changed.
Since June 6th, the General Development Irrigation Standards have been greatly modified to only require
water supply and detail for enclosures and slabs, and controls and to have these shown on the landscape
plans. By having these items submitted on the landscape plans, it puts the developer on notice to consider
water points of connection, tying the utilities planning and landscape planning together. It also means no
additional irrigation plan submittal will be needed. The standards allow for only a single water point of
connection per development. The General Development Irrigation Standards refer to Code Section 50.40
which addresses over spray of roads and sidewalks, rain sensors and other requirements.
Please note that the specifications do not allow for water reuse. Water reuse is desirable in concept and
has been suggested by developers for Royal Golf, Diedrich Townhomes, and Inwood, however, until an
Engineering study on how to successfully implement water reuse is conducted, the City is not prepared to
allow the practice.
City Council Meeting 9/6/16 [Consent Agenda Item #7]
2
Since June 6th, the corresponding Irrigation Design Details have been slightly modified as recommended
by the Engineering Consultant hired by the City to study water pressure issues. The changes are minor.
Also, when the City’s Engineering Standard Details are next updated, the Irrigation Design Standard
Details will be incorporated.
FISCAL IMPACT:
As stated on June 21, 2016, the 5th Street/City Owned and Maintained Irrigation Standards mandate an
expensive irrigation system for the 5th Street corridor, one that represents many best practices in the
industry. Maintenance of the system will be more expensive with many more irrigation heads than other
systems, but features such as flexible pipe in sleeves will lessen the damage from trail plowing and being
run over compared to cheaper systems. The resultant irrigation systems should use less water by better
distributing water as needed.
OPTIONS:
City Owned and Maintained (5th Street) Irrigation Design Standards.
a) Approve the Irrigation Design Standards for 5th Street, as presented, which represent many “best-
practices” in the irrigation industry
b) Reject the Standards and provide staff direction as to what the Council would like for City owned
and maintained irrigation systems (no irrigation to a very basic system).
General Development Irrigation Design Standards.
a) Approve the Irrigation Design Standards for General Development, as presented which minimally
address water points of connection and controls.
b) Reject the Standards and direct staff to make changes.
c) Have no specific standards for private irrigation systems.
RECOMMENDATIONS:
Staff respectfully requests, as part of tonight’s consent agenda, that the Council approve the City Owned
and Maintained Irrigation Standards and the General Development Irrigation Standards. If removed from
the Consent Agenda, the recommended action can be completed through the following motion:
“Move to approve the City Owned and Maintained Irrigation Design Standards, dated 9/6/16, and the
General Development Irrigation Standards, dated 9/6/16”
ATTACHMENTS:
• City Owned and Maintained Irrigation Design Standards, dated 9/6/16
• General Development Irrigation Standards, dated 9/6/16
• June 21, 2016 City Council memo and attachments.