Table 1. Characteristics of the dams and reservoirs. Name of Dam Marathon Dam (Old Dam) Proposed Eastern Dam Proposed Western dam Type of dam Masonry Concrete Concrete Foundation elevation (m) 180.00 210.00 228.00 Spillway crest elevation (m) 223.00 276.00 278.00 Dam crest elevation (m) 227.00 280.00 282.00 Height of the dam above ground (m) 47.00 70.00 54.00 Volume of dam to spillway crest level X103 (m3) 138.68 893.96 898.60 Volume of dam to dam crest level x103 (m3) 146.51 914.02 931.62 Volume of reservoir to spillway crest level x106 (m3) 22.06 42.72 81.67 Area of reservoir to spillway crest level x106 (m2) 2.41 1.79 4.80 Crest length including spillway channel width (m) 320.00 820.00 1350.00