The approach to calculating evaporation and evapotranspiration, both potential and actual, varies widely. The models used to estimate the amount of evapotranspiration, particularly at the Maros Climatology Station, Maros Regency, South Sulawesi. Evaporation models use the Penman, Priestley, Bruin, and Valiantzas models while evapotranspiration models use the Penman, Hargreaves, Jensen-Haise, Penman-Monteith, Radiation, Turc, and Makkink models, where all of these methods use climate data, such as are the minimum temperature (Tn), maximum temperature (Tx), air temperature (Ta), average humidity (RH), rainfall (R), duration of sun exposure (SS), and maximum wind speed (U) in calculations using Visual basic program in Microsoft Excel in the form of code. Thus, it is necessary to conduct an analysis of the suitability of the model to the results of the observations in order to find out which model is suitable according to the results of the largest coefficient of determination (R2). Based on the results of the model suitability analysis, a selected model was obtained, namely the Valiantzas model with a value of 0.980 in the evaporation calculation and the Jensen-Haise model, namely 0.889.
Penggunaan GPS RTK dalam analisis elevasi lahan dinilai memiliki keakuratan 7 yang cukup baik, namun penggunaan GPS RTK dalam perencanaan lahan dinilai kurang 8 efektif karena akan membutuhkan biaya yang cukup besar dan membutuhkan waktu yang 9 cukup lama apabila area yang dikaji cukup luas sehingga penggunaan DEM dinilai cukup 10 efisien. Penelitian ini bertujuan untuk membandingkan tingkat korelasi elevasi DEMNAS 11 dan DEM ASTER dengan data pembanding yang bersumber dari GPS RTK. Pengambilan 12 data dilakukan dengan mengambil titik XYZ sebanyak 112 titik sample di area Agrohills 13 dengan luas sebesar ± 10 ha menggunakan GPS RTK. Perhitungan secara statistik guna 14 melihat nilai korelasi untuk melihat hubungan dan keakuratan data lapang dan data DEM. 15 Hasil kajian menunjukan bahwa rata-rata perbedaan elevasi antara DEMNAS dan GPS 16 RTK adalah 17,38 m sedangkan DEM ASTER dan GPS RTK memiliki rata-rata perbedaan 17 elevasi sebesar 21,78 m. Elevasi DEMNAS memiliki tingkat korelasi yang cukup baik 18 dengan GPS RTK dengan nilai R2 sbesar 0,819, sedangkan nilai korelasi antara DEMAS-19 TER dengan GPS RTK memiliki nilai R2 senesar 0,739. Perbedaan elevasi antar DEM 20 dapat dipengaruhi oleh resolusi dari tiap DEM. Sehingga dapat disimpulkan bahwa 21 DEMNAS dapat direkomendasikan sebagai bahan yang dapat digunakan untuk 22 perencanaan lahan di Bogor Barat Agrohills karena memiliki nilai korelasi yang baik 23 dengan GPS RTK.
Soil and Water Assessment Tools (SWAT) which is developed in America was used to analyze the effect of land management on discharge, sedimentation, and water quality in a river basin area. The hydrological conditions in the Americas are different from Indonesia, so a modified SWAT is done. This research aimed to implement a modified SWAT program to predict the results of a better discharge analysis based on hydrological analysis in the sub-Watershed area. About 13.90% of the area was paddy fields. The evaluation of the module had been done by looking at the coefficient of determination (R²) and Nash-Sutcliffe Efficiency (NSE) based on the comparison of simulated discharge results with an observation discharge. Research began with delineation DEM, HRU formation, simulation, calibration, and validation. The R² value for daily data on modified SWAT was 0,725. It was better than the original SWAT and SWAT with Pothole, which were 0,706 and 0,708 respectively. Likewise, the NSE value for daily data on modified SWAT was 0,721, on original SWAT and on SWAT with Pothole was 0,668 and 0,685 respectively. The analysis result showed that the modified SWAT provide good discharge prediction results, indicated by relatively high R2 and NSE values.Keywords: hydrological analysis,modified SWAT, paddy field, pothole, SWAT
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