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' <br />' <br />, <br />� Underlying soil conditions, particularly permeability of soil. <br />� Wetted perimeter, i.e. losses vary depending on width of ditch channel and depth of flow. <br />� Time since channel was cleaned. <br />' � Depth to ground water below channel. <br />� Length of time channel has been carrying water, i.e. often the longer a channel carries water, <br />' the less seepage occurs. <br />� Evaporation from water surface which varies depending on time of year. <br />' <br />In conclusion, it appears the best measurement of ground water recharge may be derived <br />, indirectly. By measuring the change in ground water levels in the area of interest and comparing <br />changes to quantity of water imported as recharge, an estimate of needed imported water to <br />' maintain ground water levels can be made. Although the quantity of recharge is not derived, the <br />quantity of water needed to accomplish the recharge is derived. <br />' <br />�I <br />' <br />, <br />' <br />' <br />1 <br />, <br />' <br />' <br />4-5 <br />, <br />