There are two lists in the excel file for 1" and 2" RPZ.  Air Gap is also a way to do this as well.  Contact your city to rent a water meter.

Hydrant Parts List

Houston Request Permit Download

An 1" RPZ is rated for 37-58GPM and a 2" RPZ is rated 127-200GPM.  I have a 1" RPZ and can verify using two 3/4" hoses it held steady at 30GPM of constant use with no water drop in the buffer tanks.  A 3/4" hose will max out at 18GPM.  Using 1 hose we did see a slight drop in the tank over time running 20GPM as expected.

Houston requires the water meter either be installed on the truck or trailer by them and the RPZ/Air Gap system tested first or they install the water meter at each location.  In Houston you cannot legally move the water meter.

For example Houston Prices:

Customers must pay a deposit to secure the City of Houston against any loss, theft, damage, or unpaid water charges. Deposits charges are based on transient meter size as follows:

1” - $500.00

2” - $1,000.00

3” - $1,500.00

The deposit, less any outstanding charges, will be refunded to the customer upon the expiration or cancellation of this agreement. Rates for water usage through a transient water meter shall be as specified in Section 47-61. In addition to water usage, a rental fee will be charged for each month or portion of a month the meter is held by the transient meter customer. Rates will be based on meter size as follows:

1”- $95.00

2” - $185.00

3” - $460.00

All transient meter and appurtenances will be installed by an authorized City of Houston personnel and shall be made available for reading and inspection during normal business hours of the City of Houston. Customer must provide a Back-flow Preventer or an Airgap to a tank storage facility. A certificate of calibration must be provided before City of Houston personnel can install the transient meter.