HomeMy WebLinkAboutORD 688ORDINANCE 68F
AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF PALM
DESERT, ADDING TITLE 24, ENVIRONMENT AND CONSERVATION, ^;
AND ADDING CHAPTER 24.04, WATER EFFICIENT LANDSCAPE
ORDINANCE, TO THE PALM DESERT MUNICIPAL CODE.
WHEREAS, the City of Palm Desert has been a leader in drought
tolerant/water efficient landscaping; and
WHEREAS, AB 325 requires each city to adopt a Water Efficient
Landscape Ordinance or adopt the State Model Water Efficient
Landscape Ordinance; and
WHEREAS, a Water Efficient Landscape Ordinance will promote
water conservation and appropriate plant material to match the Palm
Desert theme and climate;
NOW, THEREFORE, the City Council of the City of Palm Desert,
California, does hereby ordain as follows:
Section 1. That Title 24 Environmental and Conservation be
added to the Palm Desert Municipal Code.
Section 2. That Chapter 24.04 Water Efficient Landscape be
added.
Section 3. That Section 24.04.010 Purpose and Intent be added
to read as follows:
"24.04.010 PURPOSE AND INTENT
The purpose of this Chapter is to establish minimum water
efficient landscape requirements for newly installed
landscapes. It is also the purpose of this Chapter to
implement these minimum requirements to meet the State of
California Water Conservation in Landscaping Act, Statutes of
1990, Chapter 1145.
It is the intent of the City Council to promote water
conservation through climate appropriate plant material and
efficient irrigation as well as to create a Palm Desert
Landscape theme through enhancing and improving the physical
and natural environment.
These provisions are supplementary and additional to the
subdivision and zoning regulation of this code and shall be
read and construed as an integral part of the regulations and
controls established thereby."
AMENDED
BY 0&?r-'!":A1,Cr.
S
.4-A .. ..........
. r
' K. ,.,timati water use" means a quar y of supplemental water
that wilt' de required in order to miintain the landscape in
healthy condition.
L. "ET adjustment factor" means a factor of 0.8, that when
applied to reference evapotranspiration, adjusts for plant
factors and irrigation efficiency, two major influences upon
the amount of supplemental water that needs to be applied to
the landscape.
A combined plan mix with a site -wide average of 0.5 is the
basis of the plant factor portion of this calculation.
The irrigation efficiency for purposes of the ET adjustment
factor is 0.625.
Therefore, ET adjustment factor (0.8)=(0.5/0.625).
M. "evapotranspiration" means the quantity of water evaporated
from adjacent soil surfaces and transpired by plant during a
specific time.
N. "flow rate" means the rate at which water flows through pipes
and valves (gallons or cubic feet per second).
0. "ground cover" means any material that is used to cover any
exposed soil areas in the landscape. This covering can
include materials ranging from low growing plant materials to
bark mulch to gravel. If plant materials are used, it is
important to realize that some ground cover species are
considered water efficient and some are considered high water
users. Some examples of water efficient ground covers are
Haccharis "centennial % Myoporum parvifolium, Lantana
montevidensis, and Verbena species. Examples of high water
use ground cover species are Fragaria chiloensis and Ajuga
reptans.
P. "hydrozone" means a portion of the landscaped area in a zonal
planting scheime having plants with similar water needs that
are served by a valve or set of valves with the same schedule.
A hydrozone may be irrigated or non -irrigated. For example,
a naturalized area planted with native plant materials that
does not need supplemental irrigation once established is a
non -irrigated hydrozone.
Q. "high flow check valve" means a valve that shuts off water
flow to a broken sprinkler head whereby eliminating excess
water flow onto streets and adjacent properties.
R. "infiltration rate" means the rate of water entry into the
soil expressed as a depth of water per unit of time (inches
per hour).
3
CC. '.n senr*-ig device" mean a stem F ch automatically shuts
o%.- the i.,.,igation system whe.. it ra. As.
DD. "recreational area" means any area that is to be used for
recreational purposes (physical activites).
EE. "record drawing" or "as-builts" means a set of reproducible
drawings which show significant changes in the work made
during construction and which are usually based on drawings
marked up in the field and other data furnished by the
contractor.
FF. "recycled water," "reclaimed water," or "treated sewage
effluent water" means treated or recycled waste water of a
quality suitable for non -potable uses such as landscape
irrigation; not intended for human consumption.
GG. "reference evapotranspiration" or "ETo" means a standard
measurement of environmental parameters which affect the water
use of plants. ETo is given in inches per day, month, or year
and is an estimate of the evapotranspiration of a large field
of four to seven-inch tall, cool -season grass that is well
watered. Reference evapotranspiration is used as the basis of
determining the maximum water allowances so that regional
differences in climate can be accommodated. ETo for Palm
Desert is 75.1.
HH. "run off" means water which is not absorbed by the soil or
landscape to which it is applied. For example, run off many
result from water that is applied at too great a rate
(application rate exceeds infiltration rate) or when there is
a severe slope.
II. "soil moisture sensing device" means a device that measures
the amount of water in the soil.
JJ. "soil texture" means the classification of soil based on the
percentage of sand, silt, and clay in the soil.
KK. "solar controller irrigation panel" means a panel that
collects energy from the sun, converts it, and uses it to
power an irrigation controller. These are particularly useful
in areas where there is no electrical power source.
LL. "sprinkler head" means a device which sprays water through a
nozzle.
Ili. "static water pressure" means the pipeline or municipal water
supply pressure when water is not flowing.
NN. "station" means an area served by one valve or by a set of
valves that operate simultaneously.
5
C. Rt _ .stere iistorical sites - deter., pied by the City Council;
D. Any project with a landscaped area less than 2,000 square
feet."
Section 7. That Section 24.04.050 Landscape Construction
Documentation Package be added to read as follows:
"24.04.050 LANDSCAPE CONSTRUCTION DOCUMENTATION PACKAGE
A. Two copies of the landscape construction documentation package
conforming to this chapter shall be submitted to the City.
All development projects pursuant to Section 24.04.030 shall
submit two copies of a complete package. Preliminary approval
of the development, specifically the landscape design shall be
granted by the Architectural Review Commission prior to
submittal of the Landscape Construction Documentation Package
to the Director of Public Works. No person, either as
property owner, contractor, landscape architect or otherwise
subject to the provisions of this chapter shall cause
landscape construction work to begin without having an
approved package or permission from the Director or Public
Works.
The City shall provide one copy of the Landscape Construction
Documentation Package to the water purveyor for their review
and approval. The local water purveyor will provide all
comments to the City within 10 working days. The Department
of Public Works shall review the landscape construction
documentation package. All revisions shall be made to the
package prior to approval by the Director of Public Works.
H. For commercial and multi -family developments, a copy of the
landscape construction documentation package shall be
to the property owner or property manager by the site
developer along with the record drawings and any other
information normally forwarded to the property owner or
property manager.
C. A copy of the Certificate of Substantial Completion shall be
sent by the project manager to the City of Palm Desert and
local retail water purveyor.
D. Each landscape construction documentation package shall
include the following elements:
1. Water conservation concept statement
2. Calculation of the Maximum Water Allowance &
Calculation of the Total Estimated Water Use
3. Planting Design Plan
4. Irrigation Design Plan
5. Irrigation Schedules
7
URyiNANC;E NU.
school yatus where turf provides a praying service or serves
other recreational purposes may require water in addition to
the Maximum Water Allowance. A statement shall be included
with the Planting Design Plan, designating areas to be used
for such purposes and specifying any needed amount of
additional water above the Maximum Water Allowance."
Section 10. That Section 24.04.080 Planting Design Plan be
added to read as follows:
"24.04.080 PLANTING DESIGN PLAN
A Planting Design Plan meeting the following requirements shall be
submitted as part of the landscape construction documentation
package.
A. Plant Selection and Grouping
1. Any plants may be used in the landscape, providing the
estimated water use recommended does not exceed the
maximum water allowance and that the plants meet the
specifications set forth in (2), (3), & (4).
2. The concept of zonal planting is encouraged, where plant
material having similar water use requirements shall be
grouped together into distinct hydrozones.
3. Plants shall be selected appropriately based upon their
adaptability to the climate, geological, and
topographical conditions of the site. Protection and
preservation of native species and natural areas is
encouraged.
4. Fire prevention needs shall be addressed in areas that
are fire prone. Information about fire prone areas and
appropriate landscaping for fire safety is available from
local fire departments or the California Department of
Forestry.
5. For non -turf areas a mulch should be applied to all newly
planted areas unless a heavier inert ground covering is
to be used (i.e. decomposed granite).
H. Water Features
1. Recirculating water shall be used for decorative water
features.
2. Pool and spa covers are encouraged.
E
con -ions where water :)ws or adjacent property, non-
irr�:ated areas, walks, roadwa)fs, or structures. Proper
irrigation equipment and schedules, including features
such as repeat cycles, shall be used to closely match
application rates to infiltration rates, therefore
minimizing runoff.
Special attention shall be given to avoid runoff on
slopes and to avoid overspray in planting areas with a
width less than ten feet, and in median strips.
No overhead sprinkler irrigation systems shall be
installed in median strips less than ten feet wide.
2. Irrigation Efficiency. For the purpose of determining
the maximum water allowance, irrigation efficiency is
assumed to be 0.625. Irrigation systems shall be
designed, maintained, and managed to meet or exceed 0.625
efficiency.
3. Equipment
Water meters. Separate landscape water meters shall be
installed for all projects except single family homes and
projects with a landscaped area of less than 10,000
square feet.
Controllers. Automatic control systems shall be required
for all irrigation systems and must be able to
accommodate all aspects of the design. Dual program
controllers are encouraged because of a greater range of
flexibility in watering schedules they permit.
Valves. Plants which require different amounts of water
shall be irrigated by separate valves. If one valve is
used for a given area, only plants with similar water use
shall be used in that area. Anti -drain (check) valves
shall be installed in strategic points to minimize or
prevent low head drainage.
Sprinkler heads. Heads shall have consistent application
rates within each control valve circuit. Sprinkler heads
shall be selected for proper area coverage, application
rate, operating pressure, adjustment capability, and ease
of maintenance.
Emitters. Emitters shall have consistent application
rates within each control valve circuit. Emitters shall
be selected for specific area coverage (individual
plants), application rates, operating pressure,
adjustment capability and ease of maintenance.
11
Rec N, . ed water irrigat a sys ; - s . "
Section 12. That Section 24.04.100 Irrigation Schedules be
added to read as follows:
"24.04.100 IRRIGATION SCHEDULES
Irrigation schedules satisfying the following conditions shall be
submitted as part of the Landscape Documentation Package.
A. The estimated water use recommended for the established
landscape shall not exceed the project's maximum water
allowance. The estimated water use of a hydrozone can be
calculated by using the following formula:
EWU = (ETo)(PF)(HA)(o.62)/748
(IE)
EWU = Estimated water use (ccf)
PF = Plant factor
HA = Hydrozone area (square feet)
(0.62) = Conversion factor
IE = Irrigation efficiency
748 = Conversion to billing units
The estimated water use for the entire landscaped area equals
the sum of the estimated water use of all hydrozones in that
landscaped area.
H. An annual irrigation program with monthly irrigation schedules
shall be required for the plant establishment period, for the
established landscape, and for any temporarily irrigated
areas. The irrigation schedule may include usable
precipitation as a factor, however, the estimated water use
calculation shall not include usable precipitation.
C. The irrigation schedule shall:
1. Include run time (in minutes per cycle), suggested number
of cycles per day, and frequency of irrigation for each
station; and
2. Provide the amount of irrigation water in hundred cubic
feet recommended on a monthly and annual basis.
D. The total amount of water for the project shall include water
designated in the annual irrigation schedule, plus water
needed for any water features, which shall be considered as a
high water using hydrozone.
E. Whenever possible, irrigation scheduling shall incorporate the
use of evapotranspiration data such as those from the
13
ORDINANCE NO. -533
"24.04.130 GRADING DESIGN PLAN
Grading design plans satisfying the City of Palm Desert
Grading Ordinance shall be submitted as part of the Landscape
Documentation Package. For the purpose of this code, the
grading plan will be reviewed and shall include, at a minimum,
finished configurations and elevations of the landscaped area,
including the height of graded slopes, drainage patterns, pad
elevations, and finish grade."
Section 16. That Section 24.04.140 Soils Analysis be added to
read as follows:
1124.04.140 SOILS ANALYSIS
A. If a soil analysis satisfying is undertaken, it must satisfy
the following conditions and be submitted as part of the
Landscape Construction Documentation Package.
1. Determination of soil texture, indicating the percentage
of organic matter.
2. An approximate soil infiltration rate (either measured or
derived from soil texture/infiltration rate tables.) A
range of infiltration rates should be noted where
appropriate.
3. Measure of pH, and total soluble salts."
Section 17. That Section 24.04.150 Certifications be added to
read as follows:
"24.04.150 CERTIFICATIONS
A. A licensed landscape architect or contractor, certified
irrigation designer, certified irrigation manager, or other
licensed or certified professional in a related field shall
conduct a final field observation and shall provide a
certificate of substantial completion to the City of Palm
Desert and to the local water agency. The certificate shall
specifically include reference to the landscaping and
automatic irrigation system.
15
1,tCL_.14,"A1...:. NQ. - - -
minimum, t_-a audit shall be in accordance with the California
Landscape Water Management Program as described in the
Landscape Irrigation Auditor Handbook, the entire document
which is hereby incorporated by reference. (See Landscape
Irrigation Auditor Handbook, Dept. of Water Resources, Water
Conservation Office (June 1990) version 5.5).
B. Runoff, low head drainage, overspray, or other similar
conditions where water flows onto adjacent property, non -
irrigated areas, walks, roadways, or structures shall be
prohibited."
Section 20. That Section 24.04.180 Water Management for
Existing Landscapes - Exemptions be added to read as follows:
"24.04.180 WATER MANAGEMENT FOR EXISTING LANDSCAPES - EXEMPTIONS
If a project's water bills indicate that the landscaped areas
are using less than or equal to the maximum water allowance
for these landscaped areas of one or more acres, an audit
shall not be required by the water purveyor."
Section 21. That Section 24.04.190 Fees for Initial Review
and Program Monitoring be added to read as follows:
"24.04.190 FEES FOR INITIAL REVIEW AND PROGRAM MONITORING
For the purposes of meeting its obligations - under this chapter,
the following fees are deemed necessary to review Landscape
Documentation Packages and monitor Landscape Irrigation Audits and
shall be imposed on the subject applicant, property owner or
designee.
A. A Landscape Documentation Package Review Fee will be due at
time of initial project application submission to the Public
Works Department.
B. The water purveyor may require every five years the project
owner/developer to cause a landscape irrigation audit to be
completed by a Certified Landscape Irrigation Auditor. No
City fee• will be' due for the review of the audit by the
Director of Public Works.
C. If a Landscape Documentation Package is not submitted prior to
the start of landscape construction work, for those persons
required to submit a package, a late submittal fee of twice
the review fee shall be required.
The City Council, by resolution, shall establish the amount of the
above fees in accordance with applicable law."
Section 22. That Section 24.04.200 Enforcement and Penalties
be added to read as follows:
17
PP 'ED, AP"IOVED and ADOPTED the C y Council of the City
of . alm De Ft-, California on ,.nis 221.- day of October, 1992,
by the following vote, to wit:
AYES: BENSON, CRITES, SNYDER, WILSON, KELLY
NOES: NONE
ABSENT: NONE
ABSTAIN: NONE
ATTEST:
SHEILA R. CILLIGAN, ,'CITY CLERK
CITY OF PALM DESERT, CALIFORNIA
19
lk
RICHARD S. KELLY, MAYOR
CITY OF PALM DESERT, CAL ORNIA
MWA = (L. ,)(0.8 A)(0.62)/748
MWA = Maximum Water Allowance (gallons per year)
ETo = Reference Evapotranspiration (inches per year) 75.1 for Palm
Desert
0.8 = ET Adjustment Factor
LA = Landscape Area (square feet) Project = 13,068 sq. ft.
0.62 = Conversion Factor (to gallons per square foot)
748 = gallons per 100 cubic feet (ccf)
MWA for project = (75.1 inches)(.8)(13,068)(.62)/748
= 651 ccf
Total Estimated Water Use
Total Landscaped Area = 13,068
Total Turf Area 871
Total Shrub Area 12,197
I. Turf = Estimated Water Use
EWU = (ETo)(PF)(HA)(0.62)/748
IE
EWU - Estimated Water Use
ETo = Reference Evapotranspiration 75.1 for Palm Desert
PF - Plant Factor Turf - .58 Exhibit D
HA - Hydrozone Area
0.62 - Conversion Factor
IE Irrigation Efficiency - .75 Exhibit D
748 Conversion to CCF (Billing Units)
Turf EWU = (75.1)(.58)(871)(.62)/748 41.9 ccf
.75
II. Shrub Estimated Water Use
EWU ETo Y(PF)(HA)(0.62)/748
IE
EWU = Estimated Water Use
ETo = Reference Evapotranspiration 75.1 in Palm Desert
PF - Plant Factor - Low Water Use Plants - .27 (Exhibit "D")
HA - Hydrozone Area - 12,197 square feet
0.62 = Conversion Factor
IE = Irrigation Efficiency = .90 (Exhibit "D")
748 = Conversion to CCF (Billing Unit)
Shrub Estimated Water Use -
(75.1)(.27)(12,197)(.62)/748 = 367.4 ccf
.90
III. Conclusion
Shrub Hydrozone and Turf Hydrozone - Total Estimate Water Use
367.4 + 41.9 - 409.3 ccf Compared to Maximum of 651 ccf
ORDLNANCE NO. 668
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.aa«vti!'luN SCHEDULE
lock No. 1 Jan -
April
May - October
Nov
- Dec
Plant Irrigation Start
Station
Start Station
Start
Station
tation Description Type Time
Time
Time Time
Time
Time
1 Turf Spray 6 AM 10 MIN 6 AM 10 MIN 6 AM 10 MIN
10 PM 10 MIN
2 Drought Emitter/
Tolerant/ Bubbler 6:10 AM 20 MIN 6:10 AM 20 MIN 6:10 AM 20 MIN
Shrubs 10:10 PM 20 MIN
3 Drought Emitter 6:30 AM 20 MIN 6:30 AM 20 MIN 6:30 AM 20 MIN
Tolerant 10:30 PM 20 MIN
4 Drought Emitter 6:50 AM 20 MIN 6:50 AM 20 MIN 6:50 AM 20 MIN
Tolerant 10:50 PM 20 MIN
fart' zer NF formula should b( n the 3-6-12 range and applied
once ;er yei in the later winter mont i of February or March.
Agriform, Osmocote or equivalent pellets will be utilized.
Irrigation System:
Contractor will be responsible to inspect and insure that the
irrigation system is in good working order. Contractor's
irrigation specialist will inspect the entire system a minimum of
once a week.
The following items will be included in the monthly maintenance:
o Preventive maintenance - flush out main line ( every 3 months) ,
clean time -clock solar panels (once per week), clean emitter
heads (as needed) (Drip System only).
o Adjusting time -clocks and emitter heads (D.S.O.).
o Repair/replacement of pipes under one inch (1") in diameter,
risers, emitter heads and exposed electrical connections.
*NOTE: Line filters shall be replaced every three (3) months or
more frequently if necessary.
An attempt will be made to avoid watering between 7:00 a.m. and
10:00 p.m. Time clocks shall be adjusted for temperature. (See
irrigation schedule).
Total system will be maintained to assure proper operation and
coverage by cleaning out, raising and adjusting heads, adjusting
water for both winter and summer conditions, and utilizing the
system to its greatest efficiently so as to maintain the grounds
with the least amount of water cost. The sprinkler system will be
turned off on windy and rainy days. Broken heads will be replaced
immediately and heads adjusted where and when necessary to obtain
water coverage.
'XISTI SITE CONDITIONS:
This report concerns a 5.0 acre civic center complex located at the
corner of San Pablo Avenue and Fred Warring Drive in Palm Desert.
Approximately 45% of this area is landscaped(2.2 acres): A large
turfgrass belt area composed of ryegross in the cooler winter months
followed by Bermudagrass in the hotter summer months(broken by a
ryegross overseeding period in the month of October) constitutes the
major portion of the border areas of the project, while the landscaped
areas along and within the building perimeters are composed of a
variety of groundcovers, shrubs and small trees. The irrigation
system is composed of:
1.) A 'looped" hydraulic piping distribution network fed by one
Coachella Valley Water District irrigation water meter.
2.) A series of irrigation stations composed of Toro 570 pop-up
sprayhead sprinklers to irrigate the larger open turf border
areas.
3.) Many small irrigation stations composed of patios and
and sidewalk border strips which are irrigated by a combination
of Toro pop-up spray heads and bubblers.
4.) Irrigation is controlled by 2-24 station Rainbird mechanical
controllers. The clocks are adjusted seasonally.
The irrigation water source draws from the Coachella Valley Water
District domestic water system and irrigation water is limited to
one separate specific meter. The water is not filtered, but there was
little evidence of clogging or excessive sprinkler wear attributable
to the water source. Static pressure in this portion of the CVWD
distribution systemlranges from — PSI to _ PSI. System pressure
is adequate.
Lastly, the site is characterized by a soil of moderate infiltration
and permeability rotes as well as a number of protected, enclosed
plantings with favorable water conserving microclimates that
complicate efficient irrigation schedule programing and hinder
efficient irrigation water applications.
II. SOILS AND AMENDMENTS (Sol] Map and Summary Enclosed):
The soil in this project consists of the Indio soil series:
Indio fine sandy Ioam- lal 0 1.5+" of available water -holding
capaci tylf t. of soil.
ORDINANCE `10- "'rrigatior -,fficiencies of 85-90,` 1 sprint Mom; systems are
_onsider,..-excellent and 72 inches of applied irrigation water are
considered necessary to grow turf year around in the Coachella
Valley.
The following annual losses(dollar value) were also estimated by the
computer program:
a) Uncollected run-off: $224.00
b) Deep Percolation: $1,050.00
0 Non -uniformity : $941.00
ii) Set"Ting Losses: $109.00
c)Sprsy Drift and Evaporation Losses: $673.00
TOTAL LOSSES: $1949.00/YEAR
Additional probable losses in the form of nitrogen fertilizer
leach loss range from 246 to 492 pounds per year
depending upon fertilizer type and application rate.
****************CAUTIONARY NOTE******************
It should be noted that not all losses are considered recoverable.
Sprinkler uniformity rarely increases above 85X; evaporation and
spray losses are also difficult to control and to some extent
inevitable in hot, and climates.
The Landsca a Water Audits
This program combines controller schedule data and sprinkler head
measurements with CIMIS/historical weather data and monthly
turf grass water requirements in an attempt to optimize sprinkler
controller settings with turf grass requirements. The program
assumes a 672 irrigation application efficiency. Individual station
measurements were as follows:
CLOCK STATION DISTRIBUTION
UNIFORMITY
PRECIPITATION RATE
C 1-S 1
65
PERCENT
1.5 INCHES/HOUR
C 1-S2
72
PERCENT
1.6 INCHES/HOUR
C 1-S3
53
PERCENT
1.6 INCHES/HOUR
C 1-S4
75
PERCENT
1.9 INCHES/HOUR
C i -S 10
65
PERCENT
1.8 INCHES/HOUR
C2-S3
45
PERCENT
2.2 INCHES/HOUR
C 1-S4
44
PERCENT
1.9 INCHES/HOUR
C 1-S5
75
PERCENT
2.2 INCHES/HOUR
C 1-S6
64
PERCENT
2.0 INCHES/HOUR
C 1-S7
34
PERCENT
1.4 INCHES/HOUR
JJJii) On soils characterized by 1* * to mod, Nte water intake rates,
sp cler applications shou►u be applo„,j in split applications
that will give the turf -soil complex additional time to absorb
sufficient moisture to adequately wet the root zone.
iii. Reduce and equalize sprinkler head operating pressures. The
following table lists the output of the Toro 570 15' standard
gallonage 180 degree arc nozzle at its recommended operating
pressures:
PSI
GPM
RADIUS
20
1.7
12'
30
2.0
15'
40
2.2
16'
50
2.5
17'
As can be readily observed pressure variations can cause
significant differences in water distribution. Pressure
differences at the Palm Desert Civic Center can be adjusted at
each station irrigation control valve by turning the flow
control valve while watching a pressure gage connected to the
most distant sprinkler head. This will ensure that each head is
receiving adequate pressure, but not necessarily equivalent
pressure. Furthermore, if the CVWD static water pressure
should be altered by continued development as the site
landscaping is expanded, the valves will have to be readjusted.
The only way to ensure equal pressure across heads within an
irrigation station is to retrofit the nozzles to incorporate a
Pressure Compensating Device(PCD). These devices ensure a
nozzle output variation of only .3 PSI over a wider range of
pressures:
PSI
GPM
30
1.9
40
2.0
50
2.1
60
2.2
70
2.2
These PCDs can be inserted into your current sprinkler heads at
minimal cost and are highly recommended pressure equalizing
devices for large, multiple head, irrigation stations as are
found at the Palm Desert site. PCDs for bubblers are also
available.
nRD-INANC=: NO. 588 7
d) In the sloping border areas split applications are necessary
when applications exceed 5 minutes to avoid run-off.
e) The placement of a set of tensiometers at the 6" and 12'
depths within representative area of turf would also assist in
fine-tuning irrigation application frequency and duration.
ll. Uniformity Improvements (as discussed above).
V I I I . ALTERNATIVES:
None. This soil is well suited to the culture of ornamental plants.
IX. ASSISTANCE AVAILABLE FROM SCS/RCD:
1. SCS/RCD will assist in performing and evaluating schedule
alterations after uniformity improvements.
2. SCS/RCD will assist in providing current CIMIS data for fine
tuning sprinkler controller schedules.
3. SCS/RCD will assist in directing and locating system uniformity
alterations.
4. Tensiometer site selection, installation and calibration.
ORDINANCr NO. 688 SA:TLE
SOIL AND CAPABILITY IMF 9MMY
Cooperator
U.S. Departamt of Agriculture
Sail 6osaormtioa Service
Lea
Cap.
unit
Slisp bol
Soil Name
Inches For
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11. SOILS AND AMENDMENTS (Soil Map and Summary Enclosed):
The soil in this project consists of the Indio soil series:
Indio fine sandy loam((pl 0 1.5+' of available water -holding
capacity/ft. of soil.
This soil is fairly well suited to turf culture. Its water -holding
capacity is excellent and very compatible with the culture of
ornamental plants, but its infiltration, permeability and drainage
rotes are only moderate and plants will require split applications of
irrigation water during periods of peak evapo-transpiration and high
application rotes to avoid run-off. This soil's high water holding
capacity will also allow for one to two day intervals between
irrigation applications.
III. SALINITY:
There are currently no external signs of salinity problems.
IV. DRAINAGE:
No drainage problems were noted, although frequent run-off into
the street gutters was observed along the sidewalks and street curbs.
i .IBIT .
Sample Water Conservation Concept Statement
Project Site:
Project Location:
Project Number:
Landscape Architect/Irrigation Designer/Contractor:
Included in this project submittal package are:
(check to indicate completion)
A. Maximum Water Allowance Calculation
Maximum Water Allowance=(ETo75.1)(0.8)(LA )(0.62)
Maximum Water Allowance- (ccf)
(ETo=Reference Evapotranspiration from State equals 75.1
for Palm Desert, LA -Landscaped Area in square feet)
B. Planting Design Plan
C. Irrigation Design Plan
D. Irrigation Schedules
Estimated Annual Water Use (ccf per year)
E. Maintenance Schedule
F. Landscape Irrigation Audit Schedule
G. Grading Design Plan
H. Soil Analysis (optional)
Description of Project
(Briefly describe the planning and design actions that are intended
to achieve conservation and efficiency in water use.)
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3-16-92 COlCM= VALUM M= OISMUCT 390-2651