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3.2 Calculation of
In Tucson, different types of plants need different amounts of water each month because rainfall and temperature vary from month-to-month (Table A-4). Table A-6 shows the
needed to provide harvested water for each square foot of
for different plant types in different months. The data on Table A-6 was calculated using the following equation for each month and each plant type:
needed = Monthly water demand per square foot of plant type
Effective monthly rainfall
PLANT TYPE | SQUARE FEET OF
NEEDED TO MEET WATER DEMAND FOR EACH SQUARE FOOT OF CANOPY AREA | |||||||||||
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
Very low water use | 0.8 | 1.0 | 1.8 | 7.1 | 10.3 | 10.9 | 1.1 | 0.9 | 1.2 | 1.2 | 1.3 | 0.6 |
Low water use | 1.5 | 2.1 | 3.7 | 14.2 | 20.6 | 21.8 | 2.2 | 1.7 | 2.5 | 2.4 | 2.7 | 1.3 |
Moderat e water use | 2.6 | 3.6 | 6.3 | 24.6 | 35.6 | 37.7 | 3.9 | 3.0 | 4.3 | 4.1 | 4.6 | 2.2 |
High water use | 3.8 | 5.2 | 9.2 | 35.6 | 51.4 | 54.5 | 5.6 | 4.3 | 6.1 | 5.9 | 6.7 | 3.2 |
3.3 Calculation of
In Tucson, plants need around 37% of their annual water supply in the hot dry months of April, May and June. The remainder of their annual water supply, about 63%, is needed in July through March. Figure A-1 illustrates the relationship between plant water demand and effective rainfall supply in Tucson. In April, May and June there is a large gap between plant water demand and effective rainfall supply. There is a smaller, but still substantial gap between demand and supply in March. The rest of the year,
supply lags behind demand, but not as much as in March through June.
By designing a
that has
sized to fully meet March plant water demand, the harvested water supply would typically exceed plant water demand in July through February (Figure A-2). This design strategy provides a cushion in meeting the 50% goal for the
and is recommended by the city as a general approach.
Based on Table A-6, a landscape composed of low water use plant types would need a
of 3.7 to 1 to meet March water demand. This means that for each square foot of
(as seen from a bird’s eye view), 3.7 square feet of
is needed to collect
from. This area includes the dirt
Infiltration Area the plants are located in, and any parking lot, roof-top, or other hard surface around the plant that drains to that area.
It is best to locate plants of the same type in a
Infiltration Area, though
may have different plant types in other
. Table A-6 can be used to determine appropriate
for the plant types used in Tucson.
Annual Water Use Report | ||||
Reporting period (month/day/year): from _______________ to _____________________ | ||||
Project Name | ||||
Project Address | ||||
Owner name | ||||
Report Preparer name Preparer title | ||||
Preparer address | ||||
Preparer email Preparer phone | ||||
Source of rain data (check all that apply): ____on raingage ___ www.rainlog.org station: note the closest cross streets ___________________________________________________ | ||||
Source of metered irrigation water (check all that apply): ___Tucson Water, acct # _______________ ____ water from another water utility ____well water ____ reclaimed water | ||||
MONTHS | RAINFALL (inches) | IRRIGATION WATER USE | ||
Projected landscape water demand shown in the Harvesting Plan (gallons) | Actual metered use (gallons) | Difference (gallons) | ||
January | ||||
February | ||||
March | ||||
April | ||||
May | ||||
June | ||||
July | ||||
August | ||||
September | ||||
October | ||||
November | ||||
December | ||||
ANNUAL TOTAL | ||||
Explanation for any exceedence of annual irrigation water use projected in the approved Harvesting Plan: | ||||
Changes to the landscape or irrigation system in the reporting year: | ||||
AREA BELOW FOR STAFF USE ONLY | ||||
Drought conditions exist at the : | ||||
Compliance with Harvesting Plan: | ||||
Audit required/date/outcome | ||||
This standard has been established for the purpose of informing applicants of the preparation, submittal, and review procedures for development within areas that have environmentally valuable habitat in conformance with Article 1, Division 1, Floodplain and
Hazard Area Regulations, Chapter 26, Tucson Code; Article VIII, Watercourse Amenities, Safety and Habitat (WASH), Chapter 29, Tucson Code; and Section 5.7, Environmental Resource Zone (ERZ), Unified Development Code (UDC), Chapter 23, all of the Tucson Code; so that proper and adequate information is presented in a consistent manner, thereby providing the basis for an efficient and timely review.
This standard is further to insure that the adopted policies of the Mayor and Council and adopted recommendations of the city’s
Advisory Committee are accurately reflected in the implementation of existing regulations.
The areas subject to regulation under this technical standard include the floodplain and floodway fringe areas as defined in Section 26-2, and the adjacent banks and associated riparian habitat as provided in Section 26-5.2(3) and (4), which are established as the “regulated areas”. If there is no encroachment within these regulated areas, the documentation requirements, development restrictions and mitigation requirements do not apply.
Where the regulated areas are based upon maps prepared for the TSMS Phase II
Master Plan, the Critical and Sensitive Wildlife Habitat Map, or similar maps prepared by Pima County, there is a presumption that riparian habitat that should be preserved has been documented on the property. Any development must therefore comply with this standard to establish the precise location of riparian habitat. It is, however, the actual documentation of the location of the habitat pursuant to this standard that will determine where the development may occur, not the maps.
If there is encroachment into the regulated areas, the standard requires that the riparian habitat be identified and delineated as the “protected riparian area”. This will include the submittal of an Environmental Resource Report that will document (1) the areas that contain riparian and wildlife habitat that is to be preserved and (2) those areas without such habitat. Development is permitted within the regulated areas that are outside the protected riparian areas. Development within the protected riparian area is limited as set forth in this standard.
It is the intent of this standard that the protected riparian area incorporate the Critical Riparian Habitat in ERZ watercourses, the Resource Areas in WASH watercourses, and riparian habitat within the undesignated regulatory floodplains so that there is a single process for review with consistent criteria for application.
This standard does not waive any applicable city regulations or codes.
This standard applies to all applications accepted for review after November 7, 2006. Exceptions to this applicability include:
A. This standard does not apply to single family residential lots with dwellings constructed in accordance with the building permits issued before November 7, 2006.
B. This standard does not apply in a manner that conflicts with a rezoning or special exception approved by the Mayor and Council after November 7, 2001.
C. This standard may apply to an exempt application at the request of the applicant.
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