Water Resources Planning Branch, WRA, MOEAWater Resources Planning Branch, WRA, MOEA

Project background and origin

Due to the increasing public and industrial water consumption in the Hsinchu area, According to the Taiwan Water Corporation’s estimate that the water consumption in Hsinchu area should increase 198,000 CMD in 2006.In 1989 The Water Resources Agency estimate that the original water source and water consumption can only be maintained until 1998.

In order to solve the water dilemma and support the long-term economic development in Hsinchu, The Taiwan Provincial Water Resources Bureau Planning Team (predecessor of the Institute) conducted preliminary exploration of the Second Baoshan Reservoir in 1986. Initial planning began in 1989. Made feasibility studies in 1993. "The Project Plan for the Second Baoshan Reservoir in Hsinchu County" was proposed in 1995(the location of the reservoir is shown in Figure 1). It was built by the Taiwan Water Resources Bureau (predecessor of the Water Resources Agency), the Taiwan Water Corporation and the Hsinchu County Government. It began construction in April 1997 and completed in June 2006.

Second Baoshan Reservoir is located in Shanhu Village, Baoshan Township, Hsinchu County. It features an off-stream reservoir densign, and obtains excess water diverted from the Shang-ping River, which is a tributary of the Touqian River. After the sand sinking in the sediment silting basin, the water is Transbasin Diversion into the reservoir for storage and utilization.

Figure.1 Second Baoshan Reservoir Location map

Summary of major developments in the project

Planning process and results

1. Water Resources Planning Institute conduct Planning situation

   Water Resources Planning Section planned the project. Geo-Tech Research Section Handled dam material survey, geological exploration, topographic survey, etc. The photo of the planning test process such as photo 1.

   

   1、Foreign consultants visit dam site horizontal pit (1993.12.1)

   

   2、Geological drilling of slope in reservoir catchment area (1992.8.5)

   

   3、Reservoir planning work Seminar (1993.9.1)

   

   4、reservoir planning project description meeting (1993.2.22)

   Photo 1:Baoshan Second Reservoir Planning Test Photo

2. Planning process plan

   1. Dam site plan:

      The Institute conducted a survey on the water source development of Fengshan river and Touqian river in 1986. After three years of investigation and selection of seven possible dam sites, chose two possible dam sites. Two possible dam sites were evaluated in 1991. Because the dam site has less dam filling, the inundation area was simpler and the raw water cost was lower. (16.38 TWD / ton), so the current Baoshan Second Reservoir dam site was selected.

   2. Transbasin Diversion weir plan:

      There are two original plans for the weir plan. As shown in Figure 2, the first plan is to use the existing dry trees weir to block the river rafts and increase the water intake at the inlet; the second plan is to build a new river at about 350 meters upstream. After assessing the difficulty of the construction of the newly built barrage and the difficulty of maintaining the deep flume, the first plan was adopted.

      

      Figure.2 Two original plans for the weirs plan location

   3. Water source application plan:

      The original plan of the reservoir was to supply water for the Hsinchu area by a single reservoir, which was about 191,500 CMD. After considering the joint use with other reservoirs, the planning “Evaluation of Conjunctive Operation of Baoshan Reservoir, Baoshan Second Reservoir and Longern Weir” was conducted in 1996. The joint use of Longen and Baoshan Reservoirs increased the system water supply to 282,000 CMD.

3. Data and graph

   Major project data of Baoshan second Reservoir.

   Structure	item	content
   reservoir	catchment area	reservoir catchment area 2.88 square kilometer
   	full water level	EL.151.73meter（498 feet）
   	full water level area	1.93 square kilometer
   	capacity	31,900,000 cubic meter
   	effective capacity	31,340,000 cubic meter
   dam	type	earth dam with impermeable core layers
   	top elevation	EL.154 meter
   	top length	350meter
   	top width	10 meter
   	height	58 meter
   	Dam volume	2,052,000 cubic meter
   spillway	Structure	free overflow weir toothed pier steep groove reinforced concrete structure
   	type	free overflow
   	Design flood discharge	112 cms
   	Top elevation	EL.150 meter
   water intake	type	three-layer water intake leaning tower
   	elevation	140、125、110meter
   Shang-ping weir(transbasin diversion facility )	catchment area	233.04 square kilometer
   	type	concrete arch dam
   	Height	10.5 meter
   	length	70.53 meter
   	width	2 meter
   	top elevation	EL.172.65 meter

   

   Photo of Baoshan Second Reservoir after completion