^ ~~~~~~E1169 VOL. 1 GUANGRUN RIVER HYD)ROPOWERPROJECT Public Disclosure Authorized HUBEI, CHINA ENVIRONMENTAL IMPACT ASSESSMENT FINAL REPORT NOVERMBER 2005 Public Disclosure Authorized Public Disclosure Authorized CHINA SECOND NAVIGATION DESIGN INSTITUTE With assistance from: ENSHI ENVIRONMENTAL MONITORING STATION JIANSHI ENVIRONMENTAL MONITORING STATION Public Disclosure Authorized GUANGRUNRIVER HYDROPOWER PROJECT HUBEI, CHINA ENVIRONMENTAL IMPACT ASSESSMENT FINAL REPORT NOVERMBER 2005 CHINA SECOND NAVIGATION DESIGN INSTITUTE With assistance from: ENSHI ENVIRONMENTAL MONITORING STATION JIANSHI ENVIRONMENTAL MONITORING STATION EIA/GRHP FINAL REPORT CHAPTER I INTRODUCTION Abbreviations CWRC-------Changjiang Water Resource Commission CC------------Construction Contractor EIA-------------Environmental Impact Assessment EPB------------Environmental Protection Bureau EMP------------Environmental Management Plan EPMs-----------Environmental Protection Measures EMO-----------Environmental Management Office ESE------------Environmental Supervision Engineer GRHP---------Guangrun River Hydropower Project HHDP---------Hubei Hydropwer Development in Poor Areas Project PMO-----------Project Management Office RAP------------Resettlement Action Plan SNDI----------The Second Navigation Design Institute SEPA----------State Environmental Projection Agency WB------------The World Bank I1- EIA/GRHP FINAL REPORT EXECUTIVE SUMMARY Chapter 2 Project Description 2.1 Project Location As shown in Figure 2.1.1 -1, the GRHP is located in the northwest of Yezhou Town, Jianshi County, Hubei Province, upstream of Zhamushui River Basin. Figure 2.1.1-2 shows GRHP in the big picture of Hubei Province. Qing River 0 ~~~~~(6 big 7 Mashui power e Gor2es Dam River stations) 127km Yangtze * \ \ River Hubei Guangrun Province Q9 area River Legend Oservoir Power plant Figure 2.1.1-2 GRHP Location in the "Big Picture" 2 EIA/GRHP FINAL REPORT EXECUTIVE SUMMARY As the data shows that, on Yangtze River Basin, the total capacity of already built hydropower projects is 4300x IO4kw including three gorges project, which acounts for one-fifth of potential water resources capacity of the whole river basin. On the secondary tributary, Qingjiang, the potential water resources capacity is about 62x10 4kw, and the capacity from current developed hydropower projects is about 8.62X104kw, accounting for 17.2 percent; the capacity of current GRHP is 2.8x 104kw, accounting for 4.5 percent of the total water resources capacity. 2.2 Project Scope The GRHP is a small-scale comprehensive hydropower project with major objectives of power generation and water supply as well as flood control and tourism development. The project includes two small reservoirs with a total reservoir storage capacity of 29.47 million m3 and three small-sized hydropower stations with a total installation capacity of 28.0 MW. The total project cost is estimated to be 255 million Yuan. 2.3 Project Objectives and Benefits Major objectives of the project include power generation, water supply as well as flood-control and tourism development. The project will have significant economical and social benefits: 1) Annual power generation of 89.68 million kwh with an annual power sale of 29.972 million yuan. 2) Flood control standard: from once in every 10 years to once in every 50 years. 3) New employment opportunities for about 1500 local people. 4) Power generation increase in the downstream Xiaoxikou power station. 5) Tourism development in project area. 2.4 Project Components Hongwawu Sub-project: the Hongwawu sub-project is consisted of dam structures, water convey system, water diversion system, first and second stage power plants, and power transmission and distribution system. Zhamushui Sup-project: the Zhamushui Sub-project is mainly consisted of a roller compacted concrete arch dam, a water release structure, water convey structure, a power house, and power transmission line. The characteristics of GRHP are shown in Table 2.3.2-1. Figure 2.4-1 demonstrates the whole parts of GRHP. 3 EIA/GRHP FINAL REPORT EXECUTIVE SUMMARY Chapter 3 Environmental Setting in Study Area In this chapter, the environmental study areas (ESA) are firstly defined and then the environmental settings in the ESA is described. The environmental setting covers four aspects as: physical environment, environmental quality and ecological environment, land use, and social environment. 3.1 Environmental Study Area According to the characteristics of this project, the overall environmental study area of this project is seen in the Figure3. 1-1; and it can be divided into 8 impact areas as shown in the Figure 3.1-2. 3.1.1 Reservoir Catchment Area Reservoir catchment area includes two impact zones: Impact Zone I refers to Hongwawu reservoir: the runoffs from the upstream of the Majia river above the dam with the area of about 6.03kmr2 and the water diverted from gullies with the catchment area of 15.45km2, such as from Duantou river, Dongpiao river, Huoshaoyiba, Huoshaoerba, Shangcao, Goujiao river, Liujia gully, Qilibian river, Zhichang river. The total catchment area is about 21.48 km2. Impact Zone IV refers to Zhamushui reservoir: the runoffs from the tail water of the Sishier hydropower station and the inflow from the branches of the river between Zhamushui dam to the Sishierba hydropower station. 3.1.2 Reservoir Areas and its Surrounding Reservoir areas in clude two impact zones: Impact zone II refers to Hongwawu reservoir with submerged area 21.48 km2 and the length of the backwater 1.0 km.at its normal water level 1583.0m. Impact zone V refers to Zhamushui reservoir with the submerged area 1.63 km2, and with 8.17 km backwater till Sishierba hydropower station (4 stages) at its normal water level 660 m. Reservoir surroundings refer to the areas in the both sides of the dams within its watershed. 3.1.3 Affected Areas in Lower Reaches Generally, affected areas in lower reaches in clude two impact zones: Impact Zone III covers the areas from Hongwawu dam to the confluence of Majia river with Zhamushui River, Majiahe Bridge with the total length 12km. Impact zone VI covers the areas from Zhamushui dam till the backwater of Xiaoxikou Hydropower station whose installed capacity, 3x 104 kW, is bigger than this project, thus the total length is 1 1km. 3.1.4 Construction Areas It is called Impact Zone VII that the total construction area is 4 km2, which refers to the areas for construction of two dams, three power plants, diversion system, spoil disposal sites, etc. 6 EIA/GRHP FINAL REPORT EXECUTIVE SUMMARY 3.1.5 Resettlement Areas It is named Impact Zone VIII, according to East China Exploration and Design Institute, the major resettlement areas for resettlers are arranged in the 17th and 18th group of Dangyangba village, 12th group of Xishuya village, I1th group of Chayuangou village, and 1 st and 7h two group of Jigongling 7 EIA/GRHP FINAL REPORT EXECUTIVE SUMMARY Runoffs of the upstreams Hongwawu reservoir Hongwawu Reservoir Hongwawu lower Diverted water flows catchment area area and its reaches surrounding The tail water of Sishierba Dam Zhamushui Reservoir Zhamushui Reservoir Zhamushui lower Catchment area area and its reaches Branchcs flowing itoa ZhatmushuiRese surrounding Construction areas Resettlement Areas Three power plants construction Xishuya villages Diversion system works - Impact zone VII Jigongling villages - Impact zoneVIII Figure 3.1-2 Impact Areas of GRHP EIA 8 EIA/GRHPFINALPORT EXECUTIVE SUMMARY 3.2 Physical Environment Climate: Hongwawu reservoir areas are mostly located in the place above EL1400 m. Yearly average temperature is 7.9-1 0.6°C; relative humidity is 85%. Hongwawu river basin is located at the center place of the west of Hubei where rainstorm normally happens, the average annual rainfall is about 2000 mm, frost-free period is about 200 days, the sunshine is about 1500 hours. Zhamushui sub-project area is relatively warm, its altitude is mostly between 500-800m. The annual average rainfall is between 1200-1500mm and the annual average temperature is between 14.2- 16.2°C with an relative humidity of 80%. Topography: The ESA is located in the third upheaval of Xinhuaxia system, crossing the joint between the end of the southem Daba Mountain and the rest branches of Wulin Mountain. Lithosphere is broken and lifts up in an obvious way. The special feature of its geology, such as round peak of the mountains, rushing groove, lithontriptic holes, invisible valley, hidden stream and etc. are seen everywhere. Geology and Earthquake: The stratum is exposed with quite extent, which belongs to the Palaepzonic Cambrian to Quaternary Cenozonic. The stratum of Upper and Lower Carboniferous system, lower Devonian system, Middle and Upper Jurassic period lack. The rock are mainly rudaceous roak and carbonate rock.. There are two fault layers within the study area. Jianshi fault is located in the southwest of the county. This fault is developed by multi-period activities. However, it is quite far away from the damsite. The second fault is from Qinshan to Shilipai. This one is not as active as the first one. According to the "China earthquake intensity territorial map", there is no active fault within the dam areas, and the center of the earthquake is also far from this region. The basic earthquake intensity in this area is rated VI. Hydrology: (1) Surface Water in the ESA, the major water system is the water system in Guangrun river basin area, including Guangrun river and its major tributaries, such as, Hongwawu river and Chichang river, etc. The Guangrun river basin is located in the upper reaches of Mashui river, which is the largest tributary of Qingjiang river in the north bank. And the Qingjiang river is one of the major tributaries of the Changjiang River (the Yangtze). The Guangrun river basin has a total area of 1709km2. The average flow at the Zhamushui dam is 6.29m3/s with an average annual runoff of 1.98x108m3. major tributaries of the river include Hongwawu, Zhamushui, Mazixia, Taiyanghe and etc. The Hongwawu River originates at Heshangbao. It flows from north towards south, and later on joins with the Zhamushui River at Majiahe Bridge.