ALBERT C. RITCHIE, GOVERNOR.                  803

deem necessary to be levied under Section 430, shall deduct the
amount to its credit in said "Current Interest and Sinking
Fund, " plus such amount as the Commission may estimate
that it will be able to collect out of the benefits theretofore levied
by it but not yet paid, from the whole amount necessary to be
raised in any one year for interest and sinking fund payments
on outstanding bonds, and the balance then remaining to be
raised shall be the amount to be certified to the County Com-
missioners of Anne Arundel County for collection by taxation
as provided by Section 430.

437. For the purpose of providing funds for maintenance,
repairing and operating its water supply, sewerage or drainage
systems, and for its operation and other expenses (including
proper depreciation allowances), and for interest on, and the
retirement of bonds as specified in this Act, the Commission
is hereby empowered and directed to make a ready-to-serve
charge on water and a charge for the upkeep of sewers charge-
able against all properties having a connection with any water
pipe or sewer pipe under its supervision or ownership. Said
rate for both ready-to-serve and such charge for the upkeep on
sewers shall be uniform throughout each sanitary district, sub-
ject to such changes from time to time as may be necessary.
The charge for the upkeep on sewers shall be reasonable and
collected annually in the same manner as benefit assessments
are collected and shall be a first lien against all property hav-
ing a connection with any sewer pipe under its supervision or
ownership. The -rates for water service shall consist of a mini-
mum or ready-to-serve charge, which shall be based upon the
size of the meter on the water connection leading to the prop-
erty, and of a charge for water used, which shall be based upon
the amount of water passing through the meter during the
period between the last two readings, said meter being required
to be placed on each water connection by and at the sole ex-
pense of the Commission. If the Commission at any time shall
not have meters available to install in air the properties in a
given locality that are connected with the system, then a flat
rate shall be charged all properties in which meters have not
yet been installed, which rate shall be uniform in each district
and based upon the amount of water used. Bills for the
amount of the charges as above specified shall be sent quarterly
or semi-annually, as the Commission may determine, to each
property served, and shall be thereon payable at the office of
the Commission; and if any bill remain unpaid after thirty