Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-173 - Requirements for measuring and reporting water use
Section 173-173-160 - Under what conditions is the use of power consumption data acceptable to the department?

Universal Citation: WA Admin Code 173-173-160

Current through Register Vol. 24-06, March 15, 2024

(1) Use of power consumption data may be substituted for more direct flow measurement methods, provided:

(a) Use of the method is approved in writing by the department;

(b) Installation of a water meter would be unduly burdensome to the water user;

(c) The water system maintains a constant or near constant pumping or diversion rate;

(d) The power meter is dedicated to one diversion or withdrawal;

(e) A pump test is conducted for a minimum duration of two hours and is conducted under normal operating conditions;

(f) The diversion or withdrawal is not a flowing artesian well.

(2) The equation below shall be used when relying upon electrical power consumption to estimate volume or flow rate. This equation also may be used to estimate flow during short periods of meter repair or maintenance if the department finds that reasonable estimates of pump and motor efficiency are available:

318,600(kWh)(Peff)(Meff)

V =

TDH

Where: V = volume of water pumped in gallons;

318,600 = conversion factor;

kWh = number of kilowatt-hours for the time period in question; e.g., irrigation season, year or minutes;

Peff = pump efficiency as a decimal;

Meff = motor efficiency as a decimal; and

TDH = total dynamic head of the system in feet.

Statutory Authority: RCW 90.03.360, 90.44.050, [90.44.]250,[90.44.]450 and chapter 43.21A RCW. 02-02-017 (Order 00-01), § 173-173-160, filed 12/21/01, effective 1/21/02.

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