To help its large irrigation customers save water and
money while improving their efficiency, the Contra Costa
Water District is creating Landscape Water Budgets for
each of its dedicated irrigation accounts.
Landscape Water Budget has been created for
each of the 1,277 commercial, institutional
and multifamily dedicated accounts. For more
on the budget format, click
prepare an accurate estimate of water use for a landscape
water budget, factors such as local evapotranspiration,
rainfall, lawn square footage, non-lawn landscape
square footage, and irrigation efficiency have been
has created one of the most accurate large-scale water
budget programs in the state to give its customers
the tools to save water save money, and keep landscapes
Landscape Water Budget Site Report compares your actual
water use to an accurate estimate of the water demand
for your site.
the Landscape Water Budget
water budget is an estimate of the water demand a
landscape needs over a specific time period. The water
budget is determined by a combination of two key factors:
1) landscape square footage area, and 2) evapotranspiration
(ETo). The landscape area is determined by measuring
the site; the ETo is measured daily at a local weather
Landscape Square Footage
With a grant from the United States Bureau of Reclamation,
CCWD measured the landscape areas of each of its 1,277
commercial, institutional and multifamily dedicated
do this, the District uses aerial multi-spectral images.
These images provide estimates of landscape area using
a multiple-band digital camera system.
image is 'classified' into several key surface types
including: lawn, shrub/tree, water, bare soil, and
hardscape/roof. Next, parcel polygons acre overlaid
onto the image, producing area measurements for each
Using GIS software, the image is linked to individual
property parcels and water account numbers. Polygons
were then reviewed and adjustments made to ensure
accuracy of site boundaries. The final result is an
image that displays individual sites and square footage
measurements for turf, non-turf landscape, water features
and bare soil.
Station Number 170 is located at the Diablo
Creek Golf Course. It measures solar radiation,
air temperatures, wind speed, humidity and rainfall.
For more on CIMIS, click
remote weather station at the Diablo Creek Golf Course
measures solar radiation, air temperature, soil temperature,
wind speed and humidity, as well as rainfall.
data is then entered into an equation; the result
is the ETo, which is provided in inches per period.
Accurate weather data is essential in creating useful
In early 2001, with a grant from the United States
Bureau of Reclamation, CCWD worked with the state
Department of Water Resources and the city of Concord
to install CIMIS Station Number 170.
station ensures local water users and the CCWD Water
Budget Program have accurate weather data for the
area. For more on CIMIS, and to register to read CIMIS
data from Station 170, click here
The Water Budget Equation
A water budget is created by multiplying the landscape
area by the ETo - Rain, which results in a volume
of water demand for a given period.
CCWD water budgets incorporate turf, other plant materials
and water features areas, landscape coefficients,
current local Eto, and rainfall. The water consumption
at a site is then compared to the water budget to
create your individual Landscape Water Budget Site
Click here for more on the Water