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Groundwater Depletion with Expansion of Irrigation in Barind Tract: a Case Study of Rajshahi District of Bangladesh

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Groundwater Depletion with Expansion of Irrigation in Barind Tract: a Case Study of Rajshahi District of Bangladesh International Journal of Geology, Agriculture and Environmental Sciences Volume – 3 Issue – 1 February 2015 Website: www.woarjournals.org/IJGAES ISSN: 2348-0254 Groundwater Depletion with Expansion of Irrigation in Barind Tract: A Case Study of Rajshahi District of Bangladesh Md. Abdullah Aziz1, Md. Abul Kashem Majumder2, Md. Shahjahan Kabir2, Md. Ismail Hossain2, Niaz Md. Farhat Rahman2, Farhana Rahman3 and Shakir Hosen3 1 & 2Agricultural Statistics Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh 2Director (Administration and Common Service), Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh 2WRP Division, Institute of Water Modelling, House # 496, Road # 32, New DOHS, Mohakhali, Dhaka-1206, Bangladesh 3 Climate Change Specialist, Climate Change Adaptation Project, LGED-DANIDA, Project Support Unit (PSU) LGED Bhaban, Level-8, Agargaon, Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh 3Grain Quality and Nutrition Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh Abstract: The study has been described continuous declination of groundwater level with increase of groundwater irrigation in Barind Tract from mid 2000 to 2013 in the perspective of Rajshahi district which is located in severely drought prone area at Northwestern part of Bangladesh. Dry season Boro rice mainly depends on supplementary irrigation from groundwater, results in severe groundwater depletion. Main source of recharging of groundwater aquifer in this area is rainfall, but rainfall is also dropping here. Hydrographs are analyzed and groundwater level contour maps are prepared by Arc GIS version 10 software from the monitoring wells data of Bangladesh Water Development (BWDB).For aquifer geometry a subsurface geological cross section made by RockWorks software from bore log data of Department of Public Health Engineering ( DPHE) and Bangladesh Water Development (BWDB).Only two aquifers exist and in NW area shows effective aquifer thickness is shorter than SE portion. Average rates of maximum depth ( dry season) and minimum depth ( wet season) groundwater depilation are 0.23meter/year and 0.38meter/year respectively in Rajshahi district, some upazilas these rates are much higher than that of average .Groundwater recharge condition is very poor in Tanore, Godagari, Mohanpur and Baghmara upazilas and vulnerable for Boro rice i.e. irrigated rice. A crucial relationship remain between Boro production and groundwater depletion, so crop diversification or less water consuming crops can be option for the study area. Keywords: Groundwater Depletion, Aquifer, GIS, RockWorks. 1. Introduction provides the major irrigation water which are causes severe groundwater depletion and may be a great threat for future Bangladesh is an agro-based country and rice is the main groundwater availability and irrigation ultimately Boro agricultural product. Rice contributes more than 80 percent to production specially in Barind area of Rajshahi district which is the total food supply. More than 95% of population consumes North-West part of Bangladesh. Northern part of Bangladesh is rice and it alone provides 76% of calorie and 66% of total now facing water scarcity problems in both agriculture and protein requirement of daily food intake [5].The cultivation of secured livelihood [2].Groundwater recharging in Bangladesh rice in Bangladesh varies according to seasonal changes in the is mainly take place by monsoon rainfall and flooding. Due to water supply. Rice in Bangladesh is grown in three distinct high elevation of Barind, it is located in flood free zone. So, seasons, namely Boro (January to June), Aus (April to August), main source of groundwater recharging in this area is rainfall, and Aman (August to December) covering almost 11.0 million but lowest amount of rainfall occur in northwestern part of hectares of land in Bangladesh [3].Boro rice provided 56.47% Bangladesh and the area has become very severely drought and 55.77 % of total rice in Bangladesh in the year 2009-10 prone area. Moreover, thick sticky clay surface of Barind Tract and 2010-11 respectively [4].But, dry season Boro rice mainly act as aquitard which impede groundwater recharging and depends on supplementary irrigation. In dry season surface increase surface runoff. As a result, groundwater level in this water source becomes limited for irrigation so, groundwater part is successively falling by years with increasing withdrawal WOAR Journals Page 32 of water for irrigation. [7].To have proper monitoring on 1.2 Objectives groundwater level and keep agriculture practice smooth, there To understand Groundwater depth and variability of study is a need of analysis work for better crop yield it is a must to area. keep the water table within suction limit [1].It also needed to To determine the lateral and vertical extent, thickness and find out suitable and vulnerable area of irrigation. As, continuity of the aquifers. geological condition of an area governs the occurrence and To identify impact of Boro rice production on groundwater distribution of groundwater. So, evaluation is needed to depth. measure the geological condition in this regard. Find out suitable and vulnerable area of Boro rice with respect to groundwater fluctuation of the study area. 1.1 Geography and Geology The future recommendation of rice production with Rajshahi has sub-tropical climate with a mean annual rainfall of Groundwater fluctuation and variation. 1625 mm, which is much lower than the national average of 2550 mm. During summer (March-May) temperature rises 2. Methodology above 40°C, but falls below 5°C in midwinter (January). The Secondary data was mainly used for this study. The study was mean relative humidity is low (60%) in early summer (March) based on groundwater monitoring wells data of Bangladesh and high (88%) in late monsoon (August-September) [6]. Water Development Board (BWDB) from 2000-2013. Lithology of the study area was studied from borehole logs data collected from Public Health Engineering Department (DPHE). Rainfall data was collected from Bangladesh Meteorological Department (BMD). Boro rice area and production data were collected from Bangladesh Bureau of Statistics. Twenty eight monitoring wells data were used for mapping of contour groundwater depth (maximum, minimum, fluctuation) of study area for the year 2012-13 to evaluate the trend of the groundwater movement. Depth was calculated in meters. Mapping software ArcGIS 10 was used for contouring and others mapping. Long-terms Hydrographs were produced to measure groundwater depth and variability. Then aquifer variability map or hydro stratigraphic cross-section generated by bore log data through RockWorks software, then correlation Figure 1: Rainfall graph of Rajshahi District from 2000-2012 between aquifer variability and irrigated (Boro) rice production has been conducted. The study area is a small part of the Ganges River basin – a flat alluvial basin. The surface geology consists mainly of 3. Result and Discussion sedimentary formations, mostly riverine in origin (Haque et 3.1 Water Table Contour Maps al.,2012). Barind Tract made up of Pleistocene Alluvium also Water table contour maps show the gradient and direction of known as Older Alluvium and floored by reddish brown, sticky the water flow in the study area. The attitude and direction of Pleistocene sediment; Madhupur Clay . Pleistocene Dupi Tila the water table vary with the permeability of the saturated beds Sand acts as aquifer in Barind Tract [7]. and within the amount and rate of recharge and discharge. In Bangladesh two extreme trends are observed in the groundwater table throughout the year- a high water head during the wet season and a low water head during the dry season. This implies a gain or loss of water in the aquifer storage influenced by the seasonal variation. Recharge to the groundwater in the study area occurs mainly through infiltration of rainfall, stream and channel flow and percolation from pond and low lying areas. Besides, return flow from irrigated fields and inflow from adjacent areas of higher elevation also contribute minor recharge. 3.1.1 Groundwater Depth Contour Map of Minimum Depth With the start of the monsoonal rainfall the water table is rising and reaches to the highest elevation so minimum depth. The rising of water table replenishes the discharge. Generally, the minimum depth of water table occurs from July to September. Water table depth is inversely proportional to water table Figure 2: Upazilas of Rajshahi elevation. So, depth is as less, elevation is as high which is good for groundwater condition. The minimum depth water table contour map is prepared with 01m interval (Figure 3).The WOAR Journals Page 33 depth increase towards from Southern to Northern part of the Groundwater depth contour map of maximum depth is prepared study area. Thus main flow is being in the Sothern portion to with 01m interval (Figure 4).The maximum depth of Northern and eastern direction. Groundwater level is high in groundwater in the study area range from 7m to 22m. Depth is the vicinity of Ganges River. So it implies Ganges river water lower Southern side and high in Northern side especially recharging ground water. Minimum depth varies from 1m central part of the study area is very high. This map also shows to17m. Depth is very high in central and North-Western part of groundwater flows towards Southern portion to Northern and the study area that comprised the upazilas of, Mohanpur, western directions. High
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