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Master Plans and Area Plans
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Master Drainage Plan (MDP) |
| A master drainage plan addresses
the current and future drainage needs of a given
community. The boundary of the plan usually follows
regional watershed limits. The proposed facilities
may include channels, storm drains, levees, basins,
dams, wetlands or any other conveyance capable of
economically relieving flooding problems within the
plan area. The plan includes an estimate of facility
capacity, sizes and costs. |
| MDP's are prepared for a variety
of purposes. First, the plans provide a guide for
the orderly development of the County. Second, they
provide an estimate of costs to resolve flooding
issues within a community. These plans are used by
the District's Management, Zone Commissioners and
Board of Supervisors to determine Capital Project
expenditures for each budget year. Finally, the
plans can be used to establish Area Drainage Plan
fees for a given community, which prevent existing
taxpayers from having to shoulder the burden of land
development costs. |
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Area Drainage Plan (ADP) |
| An area drainage plan is a
financing mechanism used to offset taxpayer costs
for proposed drainage facilities. The fees are
imposed on new development within the plan area. The
Subdivision Map Act requires that agencies imposing
fees have a general drainage plan for the fee area,
a special fund for the fees and an equitable
distribution of the fees prior to implementation.
The Area Drainage Plan is essentially the Master
Drainage Plan with additional language supporting
the costs and distribution of the fee within the
plan area. |
| Developments falling under the
Subdivision Map Act (those requiring a division of
lands) pay fees on a per acre basis. Developments
falling outside of the Subdivision Map Act (known as
discretionary developments) can only be assessed
fees based on their impacts to the watershed. The
ADP Rules and Regulations state that these impacts
can be related to the amount of impervious surface
area that the development creates. Therefore,
discretionary developments are charged not on a
gross acreage basis, but on the total impervious
acreage created by their development. The ADP Rules
and Regulations establish guidelines used in the
administration of ADPs including design and
construction responsibilities and fee credit
determination. |
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Links |
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MDP Index Map |
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ADP Index Map |
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MDP/ADP Reports |
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Rules and Regulations for the Administration of Area
Drainage Plans
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