1. (1) The following requirements to measure and report water use, when the department so requires, shall apply to responsible parties who divert or withdraw water.

   Recording and Reporting Requirements
   Average diversion rate in gallons per minute	<10 gpm	10-49 gpm	˃50 gpm
   Recording frequency	Monthly	Biweekly	Weekly
   Volume or rate to report	Maximum rate of diversion	Maximum rate of diversion	Maximum rate of diversion
   	Annual total volume	Annual total volume	Annual total volume
   Date data must be reported to department	By Jan. 31 of the following calendar year	By Jan. 31 of the following calendar year	By Jan. 31 of the following calendar year
   Monthly means calendar month
   Weekly means Monday 12:01 a.m. to Sunday 12:00 p.m.
   Biweekly means once every two weeks
   Daily means 12:01 a.m. to 12:00 p.m.
   1 gallon per minute is equivalent to .002 cubic feet per second

2. (2) Where a device capable of indicating flow rate is not installed, a responsible party may determine the maximum flow rate by measuring the volume of water that is diverted over a brief time period when the system is operating under maximum demand.

[Statutory Authority: RCW 90.03.360, 90.44.050, [90.44.]250, [90.44.]450 and chapter 43.21A RCW. WSR 02-02-017 (Order 00-01), § 173-173-060, filed 12/21/01, effective 1/21/02.]