The drainage structures mainly consist of pipe culverts, mitre drains, scour checks, and catch water drains and outfall drains. The proposed new structures are presented in Table 6.1 below. Table 6.10: Proposed structures Item Chainage Existing Structure Proposed Drainage Structure (A) CHANGAMWE-KWA JOMVU( A109A) 1 4+500 4x 900 PC Retain existing culverts 2 4+400 1 x 900 PC Retain existing culvert 3 4+200 1x 900 PC Retain Existing culvert 4 4+000 1 x 900 PC Retain existing culvert 5 3+800 1 x 900 PC Retain existing culvert 6 2+750 1 x 900 PC Retain existing culvert 7 2+000 1 x 900 PC Retain existing culvert 8 0+560 2 x 600 PC Replace with 2x900PCC PC 9 0+000 - 0+750 LHS New underground drainage system 1200 10 0+050 - 0+4800 LHS 1200 PC New underground drainage system 4+700 - 4+900 RHS & 11 1200 PC New underground drainage system LHS 5+000 - 5+100 RHS & 12 1200 PC New underground drainage system LHS (B) CHANGAMWE-MIRITINI( A109) - AT KWA JOMVU INTERCHANGE 1 0+450 - 0+665 1200 PC New underground drainage system 2 0+560 - 0+900 1200 PC New underground drainage system Bridges There are several bridges designed on both roads A109 and A109A mostly due to the interchanges at grade separations and crossings at the railway line. These include: Changamwe Interchange Bridge A109 2 Bridges along A109A Kwa Interchange Bridges; One across A109 One across A109A
The drainage structures mainly consist of pipe culverts, mitre drains, scour checks, and catch water drains and outfall drains. The proposed new structures are presented in Table 6.1 below. Table 6.10: Proposed structures Item Chainage Existing Structure Proposed Drainage Structure (A) CHANGAMWE-KWA JOMVU( A109A) 1 4+500 4x 900 PC Retain existing culverts 2 4+400 1 x 900 PC Retain existing culvert 3 4+200 1x 900 PC Retain Existing culvert 4 4+000 1 x 900 PC Retain existing culvert 5 3+800 1 x 900 PC Retain existing culvert 6 2+750 1 x 900 PC Retain existing culvert 7 2+000 1 x 900 PC Retain existing culvert 8 0+560 2 x 600 PC Replace with 2x900PCC 9 0+000 - 0+750 LHS 1200 PC New underground drainage system 10 0+050 - 0+4800 LHS 1200 PC New underground drainage system 11 4+700 - 4+900 RHS & LHS 1200 PC New underground drainage system 12 5+000 - 5+100 RHS & LHS 1200 PC New underground drainage system (B) CHANGAMWE-MIRITINI( A109) - AT KWA JOMVU INTERCHANGE 1 0+450 - 0+665 1200 PC New underground drainage system 2 0+560 - 0+900 1200 PC New underground drainage system Bridges There are several bridges designed on both roads A109 and A109A mostly due to the interchanges at grade separations and crossings at the railway line. These include: Changamwe Interchange Bridge A109 2 Bridges along A109A Kwa Interchange Bridges; One across A109 One across A109A
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