{"id":552,"date":"2025-04-11T01:46:56","date_gmt":"2025-04-11T01:46:56","guid":{"rendered":"https:\/\/dudhkoshistorage.org.np\/?page_id=552"},"modified":"2025-04-27T14:47:27","modified_gmt":"2025-04-27T14:47:27","slug":"study-report","status":"publish","type":"page","link":"https:\/\/dkjvcl.org.np\/ne\/project\/study-report\/","title":{"rendered":"Study Report"},"content":{"rendered":"

<\/p>\n\n\n\n

(A)      Dam, Reservoir, Hydrology, Sedimentology, Spillways, Diversion and Outlet Structures<\/u><\/strong><\/p>\n\n\n\n

(a)<\/a><\/td>Main Dam and Reservoir<\/td> <\/td><\/tr>
<\/td>Type of Dam<\/td>Concrete Face Rockfill Dam (CFRD)<\/td><\/tr>
<\/td>Dam Height (on foundation)<\/td>220 m<\/td><\/tr>
<\/td>Dam Body Volume<\/td>26.7 Mm3<\/sup><\/td><\/tr>
<\/td>Dam Crest Elevation<\/td>648.0 masl<\/td><\/tr>
<\/td>Parapet Wall Top Elevation<\/td>649.5 masl<\/td><\/tr>
<\/td>Dam Crest Length<\/td>630.0 m<\/td><\/tr>
<\/td>Maximum Normal Water Level (Max. NWL)<\/td>640.0 masl<\/td><\/tr>
<\/td>Minimum Normal Water Level (Min. NWL)<\/td>530.0 masl<\/td><\/tr>
<\/td>Total Storage Capacity<\/td>1,581 Mm\u00b3<\/td><\/tr>
<\/td>Live Storage<\/td>1,342 Mm\u00b3<\/td><\/tr>
<\/td>Dead Storage<\/td>239 Mm\u00b3<\/td><\/tr>
(b)<\/td>Hydrology<\/td> <\/td><\/tr>
<\/td>Catchment Area (at dam site)<\/td>3,857 km2<\/sup><\/td><\/tr>
<\/td>Dudhkoshi River Average Flow<\/td>209 m3<\/sup>\/s<\/td><\/tr>
<\/td>Construction Flood (50-year return period)<\/td>3,892 m3<\/sup>\/s<\/td><\/tr>
<\/td>Design Flood (10,000-year return period)<\/td>9,027 m3<\/sup>\/s<\/td><\/tr>
<\/td>Probable Maximum Flood (PMF)<\/td>12,638 m3<\/sup>\/s<\/td><\/tr>
(c)<\/td>Sedimentology<\/td> <\/td><\/tr>
<\/td>Total Sediment Annual Yield<\/td>8.82 Mm3<\/sup>\/year (15 Mt\/year)<\/td><\/tr>
<\/td>Total Sediment Volume after 50 years<\/td>441 Mm\u00b3<\/td><\/tr>
<\/td>Dead Storage Loss after 50 years<\/td>239 Mm\u00b3 (100%)<\/td><\/tr>
<\/td>Active Storage Loss after 50 years<\/td>202 Mm\u00b3 (15%)<\/td><\/tr>
<\/td>Average Annual Energy with Sedimentation (50 years)<\/td>3,331 GWh<\/td><\/tr>
<\/td>Average Dry Season Energy with Sedimentation (50 years)<\/td>1,204 GWh<\/td><\/tr>
<\/td>Average Wet Season Energy with Sedimentation (50 years)<\/td>2,127 GWh<\/td><\/tr>
(d)<\/td>Main Spillway<\/td> <\/td><\/tr>
 <\/td>(i) Gated Spillway<\/td> <\/td><\/tr>
<\/td>Type<\/td>Concrete gated<\/td><\/tr>
<\/td>Design Discharge (10,000 year return period)<\/td>9,027 m\u00b3\/s<\/td><\/tr>
<\/td>Sill Elevation<\/td>624.0 masl<\/td><\/tr>
<\/td>Crest Length<\/td>60.0 m<\/td><\/tr>
<\/td>Radial Gates<\/td>4 nos, 15.0 m x 20.6 m (width x height)<\/td><\/tr>
 <\/td>(ii) Labyrinth Weir<\/td> <\/td><\/tr>
<\/td>Type<\/td>Labyrinth Overflow<\/td><\/tr>
<\/td>Design Discharge<\/td>2,250 m\u00b3\/s<\/td><\/tr>
<\/td>Crest Elevation<\/td>640.5 masl<\/td><\/tr>
<\/td>Length<\/td>56.55 m<\/td><\/tr>
(e)<\/td>Auxiliary\/Emergency Spillway<\/td> <\/td><\/tr>
 <\/td>(i) Labyrinth Weir<\/td> <\/td><\/tr>
<\/td>Type<\/td>Labyrinth Overflow<\/td><\/tr>
<\/td>Design Discharge<\/td>3,700 m\u00b3\/s<\/td><\/tr>
 <\/td>Crest Elevation<\/td>644.0 masl<\/td><\/tr>
 <\/td>Length<\/td>154.5 m<\/td><\/tr>
 <\/td>(ii) Embankment Dam<\/td> <\/td><\/tr>
 <\/td>Type<\/td>Embankment Fuse Dam<\/td><\/tr>
 <\/td>Design Discharge<\/td>7,800 m\u00b3\/s<\/td><\/tr>
 <\/td>Crest Elevation<\/td>647.3 masl<\/td><\/tr>
<\/td>Bottom Elevation<\/td>637.0 masl<\/td><\/tr>
 <\/td>Length<\/td>154.5 m<\/td><\/tr>
(f)<\/td>Diversion Tunnels (DT)<\/td> <\/td><\/tr>
<\/td>Type and Number<\/td>Horseshoe-shaped, 2 nos<\/td><\/tr>
 <\/td>Diameter (Excavation)<\/td>13.9 m (Finished Dia. 12 m)<\/td><\/tr>
<\/td>Lengths<\/td>DT1 = 1,115.2 m DT2 = 1,289.6 m<\/td><\/tr>
<\/td>Total Design Flow<\/td>3,892 m\u00b3\/s (50 years return period)<\/td><\/tr>
(g)<\/td>Bottom Outlet (BO) (one of the Diversion Tunnels will serve as BO during operation)<\/td><\/tr>
<\/td>Type and Number<\/td>Horseshoe-shaped, 1 no<\/td><\/tr>
<\/td>Diameter (Excavation)<\/td>13.9 m<\/td><\/tr>
<\/td>Maximum Discharge<\/td>2,400 m\u00b3\/s (120 m gross head<\/a>)<\/td><\/tr>
(h)<\/td>Low Level Outlet (LLO)<\/td> <\/td><\/tr>
<\/td>Type and Number<\/td>Horseshoe-shaped, 1 no<\/td><\/tr>
<\/td>Diameter (Excavation)<\/td>9.6 m<\/td><\/tr>
 <\/td>Length<\/td>929.3 m<\/td><\/tr>
<\/td>Maximum Discharge<\/td>1,000 m\u00b3\/s (120 m gross head)<\/td><\/tr>
(i)<\/td>Middle Level Outlet (MLO)<\/td> <\/td><\/tr>
<\/td>Type and Number<\/td>Horseshoe-shaped, 1 no<\/td><\/tr>
<\/td>Diameter (Excavation)<\/td>10.5 m and 13.2 m<\/td><\/tr>
 <\/td>Length<\/td>695.0 m<\/td><\/tr>
<\/td>Maximum Discharge<\/td>1,000 m\u00b3\/s (90 m gross head)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(<\/strong>B)       Main Powerhouse<\/u><\/strong><\/p>\n\n\n\n

(a)<\/td>Headrace Tunnel<\/td> <\/td><\/tr>
 <\/td>Type<\/td>Circular shaped Concrete Lined<\/td><\/tr>
 <\/td>Diameter (Excavation)<\/td>9.32 m (with TBM), Finished Dia. 8.3 m<\/td><\/tr>
 <\/td>Length<\/td>13.2 km<\/td><\/tr>
 <\/td>Design Discharge at Rated Head<\/td>224.4 m\u00b3\/s<\/td><\/tr>
(b)<\/td>Surge Shaft<\/td> <\/td><\/tr>
 <\/td>Type and Number<\/td>Circular, 1 no<\/td><\/tr>
 <\/td>Diameter (Excavation)<\/td>20 m<\/td><\/tr>
 <\/td>Height<\/td>221 m<\/td><\/tr>
(c)<\/td>Steel Penstock<\/td> <\/td><\/tr>
 <\/td>Type and Number<\/td>Circular, 1 no<\/td><\/tr>
 <\/td>Diameter (Internal)<\/td>6.7 m (3.2 m Dia. in bifurcation)<\/td><\/tr>
 <\/td>Length<\/td>528.0 m<\/td><\/tr>
(d)<\/td>Vertical Penstock Shaft<\/td> <\/td><\/tr>
 <\/td>Type and Number<\/td>Circular, 1 no<\/td><\/tr>
 <\/td>Diameter (Excavation)<\/td>8.5 m<\/td><\/tr>
 <\/td>Length<\/td>180.0 m<\/td><\/tr>
(e)<\/td>Powerhouse<\/td> <\/td><\/tr>
 <\/td>Type<\/td>Underground Powerhouse<\/td><\/tr>
 <\/td>Capacity<\/td>600 MW (4 x 150 MW)<\/td><\/tr>
 <\/td>Turbine<\/td>Francis (Vertical Axis)<\/td><\/tr>
 <\/td>Turbine Rated Head<\/td>294 m<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(C)      Dam Toe Powerhouse<\/u><\/strong><\/p>\n\n\n\n

(a)<\/td>Headrace Tunnel<\/td> <\/td><\/tr>
 <\/td>Type<\/td>D-Shaped, Concrete Lined<\/td><\/tr>
 <\/td>Diameter (Excavation)<\/td>8.0 m x 8.0 m<\/td><\/tr>
 <\/td>Length<\/td>880<\/td><\/tr>
 <\/td>Design Discharge at Rated Head<\/td>40 m\u00b3\/s<\/td><\/tr>
(b)<\/td>Surge Shaft<\/td> <\/td><\/tr>
 <\/td>Number<\/td>Circular, 1 no<\/td><\/tr>
 <\/td>Diameter<\/td>7.0 m<\/td><\/tr>
 <\/td>Height<\/td>140.15 m<\/td><\/tr>
(c)<\/td>Steel Penstock<\/td> <\/td><\/tr>
 <\/td>Type and number<\/td>Circular, 1 no<\/td><\/tr>
 <\/td>Diameter (Internal)<\/td>2.8 m<\/td><\/tr>
 <\/td>Length<\/td>186.5 m<\/td><\/tr>
(d)<\/td>Vertical Penstock Shaft<\/td> <\/td><\/tr>
 <\/td>Type and number<\/td>Circular, 1 no<\/td><\/tr>
 <\/td>Diameter (Excavation)<\/td>3.6 m<\/td><\/tr>
 <\/td>Length<\/td>82.5 m<\/td><\/tr>
(e)<\/td>Powerhouse<\/td> <\/td><\/tr>
 <\/td>Type<\/td>Underground<\/td><\/tr>
 <\/td>Capacity<\/td>70 MW (2 x 35 MW)<\/td><\/tr>
 <\/td>Turbine<\/td>Francis (Vertical Axis)<\/td><\/tr>
 <\/td>Turbine Rated Head<\/td>182 m<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(D)      Transmission Line and Sub-Stations<\/u><\/strong><\/p>\n\n\n\n

(a)<\/td>Transmission Lines<\/td> <\/td><\/tr>
 <\/td>Type and Voltage<\/td>Double Circuit, 400 kV<\/td><\/tr>
 <\/td>Conductor<\/td>ACSR Moose (Quad bundle per phase)<\/td><\/tr>
 <\/td>Length from Main Powerhouse substation (Dhitung Substation) to Dhalkebar substation<\/td>82 km<\/td><\/tr>
 <\/td>Length from Dam Toe substation to Bhadaure substation – LILO<\/td>1.6 km<\/td><\/tr>
(b)<\/td>Substation\/ Switchyard<\/td> <\/td><\/tr>
 <\/td>Number<\/td>3 nos<\/td><\/tr>
 <\/td>Location<\/td>one next to Main Powerhouse and the other two are located next to Dam Toe Powerhouse<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

(E)       Energy, Costs, Economical and Financial Analysis, Implementation Plan<\/u><\/strong><\/p>\n\n\n\n

(a)<\/td>Energy Production<\/td> <\/td><\/tr>
 <\/td>Average Annual energy Production<\/td>3,377 GWh<\/td><\/tr>
 <\/td>Average Dry Season Energy Production<\/td>1,252 GWh<\/td><\/tr>
 <\/td>Average Wet Season Energy Production<\/td>2,125 GWh<\/td><\/tr>
(b)<\/td>Costs<\/td> <\/td><\/tr>
 <\/td>Total Capital Costs<\/td>1,593 MUSD<\/td><\/tr>
<\/td><\/td> <\/td><\/tr>
 <\/td><\/td><\/td><\/tr>
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(e)<\/td>Project Implementation<\/td> <\/td><\/tr>
 <\/td>Construction period<\/td>7 years<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

(A)      Dam, Reservoir, Hydrology, Sedimentology, Spillways, Diversion and Outlet Structures (a) Main Dam and Reservoir   Type of Dam Concrete Face Rockfill Dam (CFRD) Dam Height (on foundation) 220 m Dam Body Volume 26.7 Mm3 Dam Crest Elevation 648.0 masl Parapet Wall Top Elevation 649.5 masl Dam Crest Length 630.0 m Maximum Normal Water […]<\/p>","protected":false},"author":1,"featured_media":486,"parent":59,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-552","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/pages\/552","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/comments?post=552"}],"version-history":[{"count":6,"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/pages\/552\/revisions"}],"predecessor-version":[{"id":637,"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/pages\/552\/revisions\/637"}],"up":[{"embeddable":true,"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/pages\/59"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/media\/486"}],"wp:attachment":[{"href":"https:\/\/dkjvcl.org.np\/ne\/wp-json\/wp\/v2\/media?parent=552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}