Irrigation and MWELO

Question 1

WUCOLS Plant Factors

Answer 1

VL: 0.0-0.1
L: 0.1-0.3
M: 0.4-0.6
H: 0.7-1.0

Question 2

IE

Answer 2

Irrigation Efficiency:
0.75 Spray
0.81 Drip

Question 3

Where to get ETo values

Answer 3

CIMIS

Question 4

ETAF (Adjustment Factor) must not exceed:

Answer 4

0.55 for Residential
0.45 for Commercial

Question 5

ETWU must be below what

Answer 5

MAWA

Question 6

MAWA Formula

Answer 6

(ETo) (0.62) [(ETAF x LA) + (1-ETAF x SLA)]

Question 7

Pressure Loss: Water Meter

Answer 7

6-10 PSI

Question 8

Pressure Loss: Backflow Preventer

Answer 8

8-12 PSI

Question 9

Pressure Loss: Remote Control Valves

Answer 9

3-5 PSI

Question 10

Pressure Loss: 1” diameter PVC pipe

Answer 10

0.1-3.4 psi per 100 lin ft

Question 11

Pressure Loss or Gain: Elevation Change

Answer 11

0.433 psi/ft elev change (head)
(0.433 x head)

Question 12

Check Valve

Answer 12

Keeps pressure constant in system

Question 13

Graywater Tier 1: Clothes Washer Systems or ‘Laundry to Landscape’

Answer 13

(Can save 17 gallons per person per day)
No Permit Needed
Required to have valve to divert diaper or soiled water to sewer
Cannot be connected to any other building system or plumbing
Outflow must be contained on site (with no ponding or runoff)
Must discharge in a way that minimizes contact with pets (2” of mulch or solid shield over discharge area)
Must include an operations/maintenance manual that stays with the house through ownership

Question 14

Graywater Tier 2 - Simple Systems

Answer 14

Systems that are more complex than laundry to landscape but still process less than 250 gallons per day an apply for Simple Permit

Question 15

Graywater Tier 3 - Complex Systems

Answer 15

System with any water storage or processes more than 250 gallons per day.
No hose bibs, only quick coupler
Must use purple fittings for system
Graywater can be pumped back to the house for flushing toilets
Requires Building Permit

Question 16

Non- Potable Rainwater Catchment Systems

Answer 16

-If irrigation is included, must meet MWELO
-Must be reviewed for Building Permit, including complete plumbing plans with two exceptions:
1. Exterior system not used for spray irrigation with a max storage capacity of 5000 gallons, supported directly on grade, with no electrical or makeup water supply
2. Exterior system used for spray , smaller than 360 gallons
-Must be prepared by a person registered or licensed to perform plumbing design with two exceptions:
1. Systems smaller than 360 gallons
2. Systems for single family dwellings where all system components are on the outside of the building
-A maintenance manual, including a diagram of the entire system and instructions for testing water quality, operating and maintaining the system and contact info for the mfct must be kept with the building through ownership changes.

Question 17

Cross Connection Testing

Answer 17

To test cross contamination

Question 18

Who oversees MWELO?

Answer 18

Department of Water Resources (DWR)

Question 19

Spray irrigation can not be within ________ of paving

Answer 19

24”

Question 20

Spray irrigation cannot be used in mulched planting beds unless:

Answer 20

The beds are completely planted with GC that stay 18” ht max

Question 21

Max slope to spray turf near pavement

Answer 21

25%

Question 22

Precipitation Rate Formula

Answer 22

GPM x 96.3 /area

Question 23

Irrigation Systems should be designed for how many fps?

Answer 23

5 or less

Question 24

Pressure loss of 1” dia pipe per 100 lin ft

Answer 24

0.1-3.4psi per 100 lin ft