Local Road Management Manual 559 debris and the provision of necessary tools. VIII. Payment will be made under: ACTIVITY NO. 144: REPAIRING AND/OR REPLACING MINOR DRAINAGE STRUCTURES I. Description of Activity Use this activity for repairing and/or replacing damaged individual culvert pieces, catch basins, drop inlets, manhole structures, headwalls and rip-rap at culvert ends. Culvert extensions are included, if minor (one to two pieces) 1/. II. Purpose To provide properly aligned, functional and structurally sound drainage structures. III. Schedule of Application Schedule when needed as indicated by PRMF Provincial Coach and Provincial Engineer inspections. Emphasize prior to the rainy season and where surface defects have been caused by defects in minor drainage structure. IV. Construction Method Work methods vary, but include: concrete repairs, rip-rap repairs, placing culvert pieces, placing inlet grates and  placing manhole covers. V. Daily Production Rate 1 - 3 structures repaired or replaced