A Study Of Watershed Characteristics Of Tiga Dihaji Dam

Tiga Dihaji Dam is a vital water resource infrastructure building because it has a very important function for the community living downstream of the dam as a provider of raw water with a capacity of 1 m3/second, serving 38,500 Ha of irrigation, generating 35.74 MW of electricity and also playing a role in reducing floods by 7.04%. With this role, a study of the characteristics of watersheds (DAS) is needed so that the services provided by the Tiga Dihaji Dam will always be optimal and also this study will provide a basis for the management agencies in preparing the Watershed Management Plan. The analysis of the morphometric characteristics of the Watersheds of Tiga Dihaji Dam reveals that the watershed area of 1,158.2 km2 can be identified, with an elongated watershed and a river length of 61.3 km. The density of the watershed is classified as Very Rough as indicated by a Dd value of 0.26. It can also be illustrated through the river branching variable through the Br value of 5.42 which means that the Tiga Dihaji Dam Watershed has the characteristics of a rapid increase in flooding, as well as its decline. Based on its meteorological characteristics, this watershed has a high average annual rainfall of 2,535 mm / year, while the climate condition of the watershed is known to have an average temperature of 26.5 - 28.0 oC, irradiation time ranges from 35.8 - 67.4%, humidity ranges from 78.7 - 87.6% and wind speeds range from 1.2 to 1.8 m/second. Geologically, the Tiga Dihaji Watershed is composed of clay rock, sandstone, silt and napal rock at 43.3%, while the soil type is dominated by Sandy Clay Loam, which means that the watershed has the potential to produce a fairly large river discharge. While the distribution of heights ranges from 0-2,500 masl with a slope of 0.965%. In terms of land use, the Tiga Dihaji Dam watershed is dominated by 47.1% of dry land farming mixed with bushes. The land use map and the land map results in composite curve number for the Tiga Dihaji Dam watershed of 79 which means that this watershed is large enough to pass rainwater to become runoff discharge.

REFERENCES

[1] Department of Settlement and Regional Infrastructure, (2003), "Guidelines for General Criteria for Dam Design". Jakarta: Directorate General of Water Resources.
[2] Ministry of Forestry, (2013), "Guidelines for Identifying the Characteristics of Watersheds". Jakarta: Directorate General of Watershed Management and Social Forestry.
[3] Savvidou E., et al. (2016). A Curve Number Approach to Formulate Hydrological Response Units within Distributed Hydrological Modelling. Journal Hydrology and Earth System Sciences
[4] National Standardization Agency. (2015). Calculation of Mainstay River Discharge with Discharge Duration Curve. Jakarta.
[5] Resmi MR. (2019). Quantitative analysis of the drainage and morphometric characteristics of the Palar River basin, Southern Peninsular India; using bAd calculator (bearing azimuth and drainage) and GIS. Geology, Ecology, and Landscapes. Vol 3 no.4, 295-307
[6] M. Albaroot, Nabil M. Al-Areeq, Hamdi S. Aldharab, Mohammed Alshayef, Saleh A. Ghareb. (2018). Quantification of Morphometric Analysis using Remote Sensing and GIS Techniques in the Qa'Jahran Basin, Thamar Province, Yemen. International Journal of New Technology and Research, Vol 4 (8), 12-22
[7] Supangat, A.B. (2012). Hydrological Characteristics Based on Morphometric Parameters of the Watersheds in Meru Betiri National Park Area. Journal of Forest Research and Nature Conservation. Vol 9 No. 3: 275 - 283.
[8] Shrikant M. Gabale & Nikhil R. Pawar. (2015). Quantitative Morphometric Analysis of AmbilOdha (Rivulet) In Pune, Maharashtra, India, Journal od Environmental Science, Toxicology adn Food Technology. Vol 9(7), pp 41-48.
[9] Biswas Sarathi Sumantra. (2004). Analysis of GIS Based Morphometric Parameters and Hydrological Change in Parbati River Basin, Himachal Pradesh, India. Journal of Geography & Natural Disasters, Vol 6 (2).
[10] Wibawa Y, et al. (2014). The Effects of Rock Type on Runoff Water Based on Infiltration Rate Test in the Southern Part of Semarang City, Central Java. Proceeding on the Presentation of the Research Results of LIPI Geotechnology Research Center of 2014.)
[11] Sukristiyanti, et al. (2014). A Morphometry Analysis of the Watershed Areas in Vulnerable Areas of Soil Movement. Case Studies: Cibintinu Micro Watershed and Cibodas- Bandung Regency, National Geomatics Seminar of 2017: Technology Innovation in Providing Geospatial Information for Sustainable Development, 307-316.
[12] Sriyana (2011). A Study on the Watershed Characteristics of the Tuntang and the Integrated Watershed Management Modeling. Journal of Engineering. Vol 32 No. 3, ISSN 0852-1697
[13] Magesh, N. S., Chandrasekar, N., & Soundranayagam, J. P. (2011). Morphometric evaluation of Papanasam and Manimuthar watersheds, parts of Western Ghats, Tirunelveli district, Tamil Nadu, India: AGIS approach. Environmental Earth Science, 642, 373–381
[14] Yulan N. Silta. (2017). A Study of Watershed Characteristics for the Rainwater Catchment Area of the Sermo Reservoir in the Kulon Progo Regency, Special Region of Yogyakarta. Civil Engineering Media, ISSN 1693-2095. Pages 56-62.)
[15] P. Aparna et.al. (2015). Quantitative Analysis of Geomorphology and Flow Pattern Analysis of Muvattupuzha River Basin Using Geographic Information System. International Conference on Water Resources, Coastal, and Ocean Engineering. Aquatic Procedia 4 (2015) 609-616
[16] Vinutha, D.N., & Janardhana, M.R. (2014). Morphometry of The Payaswini Watershed, Coorg District, Karnataka, India, Using Remote Sensing and `GIS Techniques, International Journal of Innovative Research in Science, Engineering adn Technology, 3(5), 516-524
[17] Hambali Rizki. (2017). An Analysis of the Relationship between Watershed Forms and Flood Discharge. Case Studies: Pesanggrahan River Watershed, Krukut River Watershed and Pinang River Watershed.