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Kotei, R., Agyare, W. A., Kyei-Baffour, N., Atta-Darkwad, T. and Takyi, A.E.ae (2015). Estimation of Flow-Duration and Low-Flow Frequency Parameters for the Sumanpa Stream at Mampong-Ashanti in Ghana for the 1985-2009 Period. American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS, 15,
Abstract
The study examined the characteristics of the Sumanpa stream’s Flow-Duration-Frequency Curve statistics for a period of 25years (1985-2009) and compared the 1990-1999 and 2000-2009 Flow-Duration-Curves. The high, low and mean Flow-Duration-Curves were also analysed. The discharge records were analysed to develop a general quantitative characterization of the stream’s flow variability. Streamflow data was generated from daily stage data using the rating curve model developed at the stream’s gauge station. Flow-Duration-Frequency-Curves were developed using the Weibull plotting position and used to analyse the catchment’s surface and groundwater storage and stream’s flow characteristics. The approach placed the midpoints of the moist, mid-range, and dry zones of the curves at 25th, 50th, and 75th percentiles, respectively. The high zone was centered at the 5th percentile, while the low zone was centered at the 95th percentile. For 95% of the time, the streamflow equalled or exceeded 0.14 m3s-1, at 5% it equalled or exceeded 45 m3s-1 and at 50% flow equalled or exceeded 5.53 m3s-1.
The study examined the characteristics of the Sumanpa stream’s Flow-Duration-Frequency Curve statistics for a period of 25years (1985-2009) and compared the 1990-1999 and 2000-2009 Flow-Duration-Curves. The high, low and mean Flow-Duration-Curves were also analysed. The discharge records were analysed to develop a general quantitative characterization of the stream’s flow variability. Streamflow data was generated from daily stage data using the rating curve model developed at the stream’s gauge station. Flow-Duration-Frequency-Curves were developed using the Weibull plotting position and used to analyse the catchment’s surface and groundwater storage and stream’s flow characteristics. The approach placed the midpoints of the moist, mid-range, and dry zones of the curves at 25th, 50th, and 75th percentiles, respectively. The high zone was centered at the 5th percentile, while the low zone was centered at the 95th percentile. For 95% of the time, the streamflow equalled or exceeded 0.14 m3s-1, at 5% it equalled or exceeded 45 m3s-1 and at 50% flow equalled or exceeded 5.53 m3s-1.
Kotei, R., Agyare, W. A., Kyei-Baffour, N., Nana Kena, F., and Atta-Darkwa, T. (2015). Development of Groundwater Recharge Model for the Sumanpa Catchment at Ashanti-Mampong-Ashanti Area in Ghana. Science Research, 3,
Abstract
The research aimed at developing a groundwater recharge model from available and reliable data of recharge predictor variables from 1985-2009 for the Sumanpa catchment in the forest-savannah transitional zone. Streamflow data for the Sumanpa River was generated from daily stage data using the rating curve model developed by the researchers at the gauge station. The streamflow data generated was partitioned into its various components, including runoff and recharge by means of the PART and RORA computer programmes respectively. The relationship between the catchment’s groundwater recharge and its predictor variables were determined by means of a scatter plot, using R statistical package, and their strengths quantified using the Pearson Correlation Test. The test indicated a strong positive correlation between recharge, rainfall and runoff and a strong negative correlation with actual evapotranspiration. Based on these a lumped conceptual deterministic groundwater recharge model was developed for the Sumanpa catchment using the multiple regression analysis. Keywords: Groundwater Recharge, Actual Evapotranspiration, Correlation, Geomorphological, Conceptual
The research aimed at developing a groundwater recharge model from available and reliable data of recharge predictor variables from 1985-2009 for the Sumanpa catchment in the forest-savannah transitional zone. Streamflow data for the Sumanpa River was generated from daily stage data using the rating curve model developed by the researchers at the gauge station. The streamflow data generated was partitioned into its various components, including runoff and recharge by means of the PART and RORA computer programmes respectively. The relationship between the catchment’s groundwater recharge and its predictor variables were determined by means of a scatter plot, using R statistical package, and their strengths quantified using the Pearson Correlation Test. The test indicated a strong positive correlation between recharge, rainfall and runoff and a strong negative correlation with actual evapotranspiration. Based on these a lumped conceptual deterministic groundwater recharge model was developed for the Sumanpa catchment using the multiple regression analysis. Keywords: Groundwater Recharge, Actual Evapotranspiration, Correlation, Geomorphological, Conceptual
Kotei, R., Agyare, W. A., Kyei-Baffour, N. and Atakora, E. T. (2015). MORPHOMETRIC ANALYSIS OF THE SUMANPA RIVER CATCHMENT AT MAMPONG-ASHANTI IN GHANA. ARPN Journal of Earth Sciences, 4,
Abstract
The study determined and analysed morphometric characteristics of the Sumanpa catchment in the Forest- Savannah Transitional zone of the Ashanti Region of Ghana. Quantitative morphometric parameters were determined using remote sensing and GIS techniques to assess the requirements for ecological and hydrological conservation, planning, development and management of the catchment landscape. Results indicated that the total length of stream segments was highest under the first order streams and decreased as the stream order increased. The catchment has an area of 38 km2with channel closeness of 0.934 km km-2 indicating permeable sub-soil. The catchment has a relief of 137m and a total length of stream network of 36.51km out of which 61% was ephemeral, 38.9 % was second and third order streams. The catchment has 44 % of its area located on slopes between 5-10o with generally good vegetation cover. There are 31 streams linked to a 3rd order trunk stream forming a trellis drainage pattern. The catchment’s morphometric features suggest a general fragile topographic condition which needs strategic approach for soil and water conservation measures and urban landuse planning.
The study determined and analysed morphometric characteristics of the Sumanpa catchment in the Forest- Savannah Transitional zone of the Ashanti Region of Ghana. Quantitative morphometric parameters were determined using remote sensing and GIS techniques to assess the requirements for ecological and hydrological conservation, planning, development and management of the catchment landscape. Results indicated that the total length of stream segments was highest under the first order streams and decreased as the stream order increased. The catchment has an area of 38 km2with channel closeness of 0.934 km km-2 indicating permeable sub-soil. The catchment has a relief of 137m and a total length of stream network of 36.51km out of which 61% was ephemeral, 38.9 % was second and third order streams. The catchment has 44 % of its area located on slopes between 5-10o with generally good vegetation cover. There are 31 streams linked to a 3rd order trunk stream forming a trellis drainage pattern. The catchment’s morphometric features suggest a general fragile topographic condition which needs strategic approach for soil and water conservation measures and urban landuse planning.
Kotei, R., Kyei-Baffour, N., Agyare, W. A., Korankye, O., Adarkwa, T. A. and Amartey, J. N. A. (2015). EVALUATION OF THE PERFORMANCE OF THE SATA SMALL-SCALE IRRIGATION SCHEME IN GHANA AFTER ITS INCEPTION AND POST-REHABILITATION PERIODS. ARPN Journal of Agricultural and Biological Science, 10,
Abstract
The evaluation was carried out on the Sata Small-Scale Irrigation Scheme built, to ensure food security, create employment for the youth, alleviate poverty and improve the living conditions of farmers, in 1994. Questionnaires, interviews and observations were used to collect the data. The poor performance and low patronage by farmers stimulated this study. The non-involvement of farmers on the management of the scheme, lack of repairs and maintenance of the infrastructure, ineffective irrigation management committee, incorrect irrigation frequencies, lack of marketing strategies were some of the major reasons identified for the inability of the scheme to fulfill its primary objectives. Five years after its rehabilitation the scheme was far from its objectives. The scheme’s physical system was poorly rehabilitated and there was no comprehensive revitalization. It is recommended that for the scheme to achieve its objectives, a framework based on understanding the physical, cropping, economic and social-organizational components of the scheme is developed. Also, extension work to identify the socio-economic effects of the irrigation scheme for effective management and implementation of future schemes needs to be carried out.
The evaluation was carried out on the Sata Small-Scale Irrigation Scheme built, to ensure food security, create employment for the youth, alleviate poverty and improve the living conditions of farmers, in 1994. Questionnaires, interviews and observations were used to collect the data. The poor performance and low patronage by farmers stimulated this study. The non-involvement of farmers on the management of the scheme, lack of repairs and maintenance of the infrastructure, ineffective irrigation management committee, incorrect irrigation frequencies, lack of marketing strategies were some of the major reasons identified for the inability of the scheme to fulfill its primary objectives. Five years after its rehabilitation the scheme was far from its objectives. The scheme’s physical system was poorly rehabilitated and there was no comprehensive revitalization. It is recommended that for the scheme to achieve its objectives, a framework based on understanding the physical, cropping, economic and social-organizational components of the scheme is developed. Also, extension work to identify the socio-economic effects of the irrigation scheme for effective management and implementation of future schemes needs to be carried out.
Atta-Darkwa, T., Kabo-bah, A.T., Akolgo,G.A., Kotei, R. and Amo-Boateng, M. (2016). ASSESSMENT OF GROUNDWATER QUALITY FOR IRRIGATION IN THE ODA RIVER BASIN, EJISU-BESEASE, GHANA. International Journal of Current Research, 8,
Abstract
Hydrochemical study is a useful tool to identify the suitability of groundwater for irrigation purpose. Groundwater samples were collected from fourteen piezometers from the various locations in the study area to assess the quality of groundwater for irrigation use. To achieve this objective, concentrations of physicochemical parameters were analysed and interpreted with different irrigation indexes like Sodium adsorption ratio (SAR), ECw, Percent sodium, Magnezium hazard and Kelly’s ratio. The various parameters estimated showed that electrical conductivity values ranged between186 to 638 μS/cm, TDS values were less than 500mg/l, SAR values varies from 0.34 to 0.86 meq/l, Na % values ranges from 20.55 % to 44.09 %, MH values ranged between 25.86 % to 55.29 % and KR varying between 0.13 and 0.44. The hydrochemical study of the area revealed that alkaline earths exceed alkalis and weak acids exceed strong acids in groundwater which presented a Ca-Mg-HCO3 groundwater type. Results from the groundwater chemistry of the boreholes plotted on the USSL diagram and the Wilcox diagram indicated that the groundwater is of good quality for irrigation. The study unraveled the mechanism controlling groundwater chemistry rock-forming minerals and evaporation.
Hydrochemical study is a useful tool to identify the suitability of groundwater for irrigation purpose. Groundwater samples were collected from fourteen piezometers from the various locations in the study area to assess the quality of groundwater for irrigation use. To achieve this objective, concentrations of physicochemical parameters were analysed and interpreted with different irrigation indexes like Sodium adsorption ratio (SAR), ECw, Percent sodium, Magnezium hazard and Kelly’s ratio. The various parameters estimated showed that electrical conductivity values ranged between186 to 638 μS/cm, TDS values were less than 500mg/l, SAR values varies from 0.34 to 0.86 meq/l, Na % values ranges from 20.55 % to 44.09 %, MH values ranged between 25.86 % to 55.29 % and KR varying between 0.13 and 0.44. The hydrochemical study of the area revealed that alkaline earths exceed alkalis and weak acids exceed strong acids in groundwater which presented a Ca-Mg-HCO3 groundwater type. Results from the groundwater chemistry of the boreholes plotted on the USSL diagram and the Wilcox diagram indicated that the groundwater is of good quality for irrigation. The study unraveled the mechanism controlling groundwater chemistry rock-forming minerals and evaporation.
Atta-Darkwa, T., Kabo-bah, A.T., Akolgo,G.A., Kotei, R. and Amo-Boateng, M. (2016). ASSESSMENT OF GROUNDWATER QUALITY FOR IRRIGATION IN THE ODA RIVER BASIN, EJISU-BESEASE, GHANA. International Journal of Current Research, 8,
Abstract
Hydrochemical study is a useful tool to identify the suitability of groundwater for irrigation purpose. Groundwater samples were collected from fourteen piezometers from the various locations in the study area to assess the quality of groundwater for irrigation use. To achieve this objective, concentrations of physicochemical parameters were analysed and interpreted with different irrigation indexes like Sodium adsorption ratio (SAR), ECw, Percent sodium, Magnezium hazard and Kelly’s ratio. The various parameters estimated showed that electrical conductivity values ranged between186 to 638 μS/cm, TDS values were less than 500mg/l, SAR values varies from 0.34 to 0.86 meq/l, Na % values ranges from 20.55 % to 44.09 %, MH values ranged between 25.86 % to 55.29 % and KR varying between 0.13 and 0.44. The hydrochemical study of the area revealed that alkaline earths exceed alkalis and weak acids exceed strong acids in groundwater which presented a Ca-Mg-HCO3 groundwater type. Results from the groundwater chemistry of the boreholes plotted on the USSL diagram and the Wilcox diagram indicated that the groundwater is of good quality for irrigation. The study unraveled the mechanism controlling groundwater chemistry rock-forming minerals and evaporation.
Hydrochemical study is a useful tool to identify the suitability of groundwater for irrigation purpose. Groundwater samples were collected from fourteen piezometers from the various locations in the study area to assess the quality of groundwater for irrigation use. To achieve this objective, concentrations of physicochemical parameters were analysed and interpreted with different irrigation indexes like Sodium adsorption ratio (SAR), ECw, Percent sodium, Magnezium hazard and Kelly’s ratio. The various parameters estimated showed that electrical conductivity values ranged between186 to 638 μS/cm, TDS values were less than 500mg/l, SAR values varies from 0.34 to 0.86 meq/l, Na % values ranges from 20.55 % to 44.09 %, MH values ranged between 25.86 % to 55.29 % and KR varying between 0.13 and 0.44. The hydrochemical study of the area revealed that alkaline earths exceed alkalis and weak acids exceed strong acids in groundwater which presented a Ca-Mg-HCO3 groundwater type. Results from the groundwater chemistry of the boreholes plotted on the USSL diagram and the Wilcox diagram indicated that the groundwater is of good quality for irrigation. The study unraveled the mechanism controlling groundwater chemistry rock-forming minerals and evaporation.
