9 30 Irrigation System Planning

Irrigation System Planning

Plant: Yew

Term: Non-Potable

Yews

• Genus: Taxus

• Evergreen shrub

• Many varieties from 2’ to 20’ tall.

• Exposure: Shade to full sun

• Flat needles up to 1” long

• Used for hedges or foundation plantings

• Tend to be over-pruned

Non-potable

• Water that is not safe for human consumption

• Usually used in a recirculating system with storm or waste water

• In irrigation plans, non-potable water is always coded PURPLE.

• Purple covers are recommended

Overlap

• Head to head spacing:

• The heads are spaced so that they overlap from head to head.

• Each head should throw water far enough so that it hits the next head.

Locating Sprinklers

• Usually Circular patterns

• Rectangular – less common

• Want the most even distribution of water possible

• Begin along a sidewalk or border that you do not want to get wet

Square

• The easiest to plot, • Some areas that are

going to be covered by all four heads causing some over watering.

• Sprinklers are spaced relatively close when using a square pattern (about 50% of the diameter of the throw).

• Need more heads to cover an given area.

Triangular

• Nozzles are staggered• Space heads further apart

(usually around 60% of the diameter of the throw)

• Less overlap• Uses fewer heads• Chose a side of a

rectangular or square area as a baseline.

• Plot a heads in each corner. • Place the third head in

between and across from the two you have plotted

Only water the plants

• Avoid watering the walkways by using a combination of spray patterns.90 degree (quarter)180 degree (half)360 degree (full)

Working with Corners around a Building

Obstacles

What kind of spacing is this?

Flagpole area

• Draw in the placement of the sprinklers

• We have a combination of sizes

• Use the rainbird chart to get the recommended coverage areas and the flow rates for each spray nozzle

• Plan your piping – will ¾” pipe work for the whole area?

Tomorrow you will begin installation

• How many feet of PVC will you need?

• How many couplers?

• How many Ts?

• How many 90s?

• How many 45s?

• How many end caps