1282                            LAWS OF MARYLAND                      [CH. 802

the Board of County Commissioners, the Board of County Com-
missioners shall have full power and authority to adjust assessments
to be made against such lots for the cost of improvements herein
authorized abutting such lots to such an amount as shall be just
and equitable, and the cost of improvements thus exempted may be
included in the assessments to be made against the abutting property
included in the project, said County Commissioners may contribute
from the general funds or proceeds of bond issues such sums as in
their judgment shall be just and equitable to the original assessment,
and may also receive from a municipality, agency, private individual
or company and apply to such project such sum or sums of money
as might be agreed upon, and such adjustments as may be made by
the Board of County Commissioners shall be final and conclusive.

(2)    The special assessment taxes levied by the Board for the
costs of municipal functions, services and improvements provided in
Section 18-4(a)2, "Municipal Functions," except garbage and trash
collection removal and disposition, site acquisition and operation, shall
be by an ad valorem tax levied against all of the property assessed for
county tax purposes within such area or that portion of the area
where such are provided. The Board may allow credit against such
levy of certain state funds, provided the requirements of said Board
are complied with.

The special assessment taxes levied by the Board for the costs of
garbage and trash collection, removal and disposition, including
site acquisition and operation shall be by an ad valorem tax against
all of the properties assessed for county tax purposes within the
area receiving trash and garbage removal and disposition service.
The Board may in its discretion prescribe the method of payment and
the rate of tax for the costs of the collection, removal and disposition
of trash and garbage as follows: the basis of said tax to be the total
costs of said service divided by the number of units served. The
Board may vary the tax rate as between individual residential units
and commercial establishments and such decision as to any variance
for such service by the Booard BOARD shall be conclusive.

(3)    The special assessment taxes levied by the Board for the
costs of improvements as provided in Section 18-4 (a)3, "Surface
Water," shall be by an ad valorem tax levied against all of the
property assessed for county tax purposes within the watershed
area served by such drainage system or that portion thereof served
by any part of such system.

The Board may contribute general funds or receive contributions
from other county agencies, private interests, municipalities, adjacent
counties, the District of Columbia or the United States Government
in the pursuance of the original construction of such drainage systems
or portions thereof.

(d) The Board shall not expend general funds in carrying out
the provisions of this act except as hereinbefore provided, but in the
event in any one year the ad valorem tax, special assessment, or unit
service tax levied is insufficient for the purpose of paying the principal
and interest maturities of any bonds, notes or certificates of indebted-
ness issued under the provisions of this Act, general funds may be
used, provided and in that event the following year the particular
tax levy or assessment for such service, function or improvement
which caused the need of the use of general funds shall be increased