The Metro Board will hold public hearings throughout the area next week to obtain reaction on proposed increases in Maryland and Virginia bus fares and systemwide subway fares.

If the fare increases ae adopted by the board, they would take effect in July.

The hearing agenda also will include proposals to increase charges at Metro-owned parking lots at the New Carrollton and Landover Metro stations and to begin Sunday subway service.

All hearings will begin at 7:30 p.m. Here is the schedule:

Tuesday -- Montgomery County Council chambers, County Office Building, Rockville.

Francis C. Hammond Secondary School, 4646 Seminary Rd., Alexandria.

Wednesday -- District of Columbia City Cuncil chambers, 14th and E streets NW.

Thursday -- Arlington County Courthouse, 1400 N.Court House Rd., Arlington.

Friday -- Largo Senior High School, 505 Largo Rd., Upper Marlboro.

The Metro fare schedule is enormously complicated and nothing in the proposals will simplify it. The complexities are increased when commuters use both bus and subway to get to work and back.

The proposed increases are consistent with an informal Metro policy that would increase subway fares at a rate equivalent to inflation as measured by the Consumer Price Index. Bus fares would increases at about half the CPI rate.

Bus fares are established locally by Marland, Virginia and the District. Subway fares are established on a regionwide basis. No change is proposed in current bus fares for bus trips within the District.

No change is proposed in the present non-rush hour subway fare of 50 cents for all trips, regardless of distance.

Metro defines the rush hours as 6 a.m. to 9:30 a.m. and 3 p.m. to 6:30 p.m. weekdays.

Accompanying charts explain the impact of proposed fare increases on individual trips. Two fare schedules are proposed for the subway; the charts include examples from the most expensive schedule only.

Here is a summary of the proposed changes:

Subway Fares -- Rush Hour

Two fare schedules are being offered, because the Metro Board could not decide which one to propose. Both represent fare increases.

Under the present subway fare schedule, Metro charges 40 cents for the first three miles and 8.5 cents for each succeeding mile. However, all trips under the Potomac River, no matter how short, cost a minimum of 45 cents. Furthermore, trips from the Pentagon and Rosslyn to other stations are measured as if they were equally distant from both the Pentagon and Rosslyn.

Under the first proposal, Metro would charge 45 cents for the first three miles and 9 cents for each additional mile. The river-crossing charge and the Pentagon -rosslyn fare adjustments would be dropped.

Under the second alternative, Metro would charge 45 cents for the first three miles and 10 cents for each succeeding mile. The river-crossing charge and the Pentagon-Rosslyn adjustments would be dropped.

Special fares for eldely and handicapped patrons would be one-half the rush-hour fare, to a maximum of 50 cents.

Special 10-cent rush-hour fare reductions would be continued for all patrons boarding or leaving the subway at Deanwood and Minnesota Avenue. That special reduction is made up in direct subsidy to Metro by the District government.

Bus Fares -- Rush Hour

The present one-zone base fare in both Maryland and Virginia would be increased from 50 cents to 55 cents.

The present zone charge between the District and Maryland Zone 1 would be increased from 30 cents to 35 cents.

The present zone charge between the District and Virginia Zone G would be increased from 25 cents to 30 cents.

The Virginia radial fare zone lines would be eliminated; thus zones 2D and 2E would be combined into a single zone, as would be zones 3D and 3E.

A 25-cent surcharge would be added to Metrobus Route L-1, and express that connects upper Connecticut Avenue in the District with Capitol Hill.

Bus Fares -- Off-Peak

The present zone charge between the District and Virginia would be increased from 25 cents to 30 cents.

Special fares for elderly and handicapped patrons would remain at onehalf the off-peak fare for all bus trips, regardless of when they are made.

Rail-Bus Trips -- Rush Hour

Metor will continue its policy of forbidding transfers from bus to subway. Riders must pay full bus fare, then full subway fare. Metro does permit transfers from subway to bus, if the transfer is obtained at the subway station where the patron boards the system.

For rail-to-bus transfers at Maryland stations, the rail transfer would be valid for 45 cents off the applicable bus fare. Currently, the rail transfer is worth 50 cents.

For rail-to-bus transfers within Virginia, the rail transfer would be valid for 40 cents off the applicable bus fare, except at National Airport where the rail transfer would be worth 55 cents. Currently, the rail transfer is worth 50 cents at all Virginia stations.

For rail-to-bus transfers within the District, the rail transfer would be worth 50 cents ona bus trip within the District and worth 55 cents for bus trips starting in the District and ending in Virginia or Maryland.

Rail-bus Trips -- Off-Peak

For rail-to-bus transfers within Maryland, the rail transfer would be worth 30 cents; currently, it is worth 40 cents.

For rail-to-bus transfers within Virginia, the rail transfer would be worht 40 cents; currently, it is worth 50 cents.

For rail-to-bus transfers within the District, the rail transfer would be worth 40 cents for bus trips ending in the District and in Maryland, and 50 cents for bus trips ending in Virginia.

Flash Passes

The present price of flash passes and the present rtail value of flash passes would be continued, thus resulting in a discount for flash-pass buyers. Different passes are available for District, Maryland and Virginia trips.

Parking Fees

Fees would remain at $1 for all-day parking at lots now charging $1. The fee at the Landover lot would be increased from 75 cents to $1 and the fee at the New Carrollton lot would be increased from 50 cents to 75 cents.

The proposed fare increases are expected to produce a total of $4.4 million to $5 million in additional revenue for Metro, thus reducing the subsidy local jurisdications must pay by that amount.

Fare increases are expected to cost Metro about 500,000 bus riders and 450,000 subway riders infiscal 1980. In fiscal 1978, Metro reported annual ridership figures of 112.6 million bus passengers and 37.3 million subway passengers.