1. Cov kwj dej feem ntau muab tso rau ntawm ob qho kawg lossis qis kawg ntawm kev cuam tshuam cov kwj deg ntawm txoj kab nqes kom ntws cov dej ntws tawm uas cov kwj dej cuam tshuam tsis tuaj yeem tuav. Qhov kawg ntawm cov kwj deg txuas mus rau cov reservoirs los yog cov dej ntws zoo.
2. Qhov gradient ntawm cov dej ntws tawm ntawm txoj kab nqes yog nyob ntawm qhov chaw ntawm nws qhov chaw ntws (reservoir lossis natural drainage channel). Thaum lub qhov hluav taws xob tso rau ntawm tus ntiv taw ntawm txoj kab nqes, lub qhov dej ntws yog roughly orthogonal rau txoj kab nqes hav contour; Thaum lub qhov dej ntws mus rau ntawm txoj kab nqes, lub qhov dej ntws tuaj yeem tso tau raws li cov kab contour lossis obliquely rau lawv. Txhua qhov layouts yuav tsum tau tiv thaiv kev yaig (tso turf lossis pob zeb hauv ob sab phlu).
3. Cov kwj deg ntawm ob qho kawg ntawm thaj av terraced feem ntau yog nteg orthogonal rau txoj kab nqes hav contour thiab roughly nyob rau tib txoj kev ntawm ob qho kawg ntawm terraces. Feem ntau, av nkos kwj dej yuav tsum tau nruab nrog cascades nyob rau hauv seem. Qhov ntev ntawm lub qhov dej kwj dej tuaj yeem ua tau raws li qhov tseem ceeb ntawm thaj chaw terrace, nrog rau qhov dav ntawm txhua lub terrace raws li kab rov tav thiab qhov siab ntawm txhua lub terrace raws li kev poob. Kev ntsuas tiv thaiv - yuav tsum tau coj mus rau hauv cov ntsiab lus poob (ntev turf lossis hauv ob sab phlu nrog pob zeb).