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acre pond Aquaculture aquifer built compacted cross-sections and multiply cut and ﬁll depth dike core dike goes dike top dikes Fig dirt distance Diversion ponds downhill dike drain drainage area drainage canal drainage system efﬁcient embankment pond evaporation farmer feet and build Figure ﬁll calculations ﬁnd the area ﬁne ﬁrst ﬁsh culture freeboard ground surface groundwater ponds herbicides high CO2 hold water horizontal inexpensive inﬂuence landís landís slope layers of earth loam lower dike major disadvantage monk natural ground overﬂow Particle Size Permeable layers pipe or canal pond area pond bottom ponds are usually pure clay retum sand seep seepage side dike side slopes slope Fig sloping sides small surface Soil Conservation Service Soil Type soilís Stake surface area topography topsoil trench uphill dike Usually pollutant free vertical Water ﬂow water level water quality water source water supply water table waterís surface Watershed Pond