Artificial Recharge of Groundwater by Takashi Asano

By Takashi Asano

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Generally speaking, the matter of water management, as codified in the Colorado Water Right Determination and Administration Act of 1969, is the concern addressed here. In a nutshell, the intent of the following discussion in this section is to show that (1) implementation of Colorado water law is complex because both the physical and legal systems are complex; (2) the intent of Colorado water law is clear, but its articles are not specific to the local conditions, and (3) as a result, numerous litigations have occurred and will continue to occur; (4) the matter cannot be resolved to the satisfaction of all parties if the physical system and its legal management cannot be described realisti­ cally; and (5) the Colorado Supreme Court demands that the best technol- 52 OVERVIEW AND FUNDAMENTAL CONSIDERATIONS ogy b e applied t o t h e r e s o l u t i o n of w a t e r p r o b l e m s , a n d t h e state is remiss in t h e p e r f o r m a n c e of its duties if it d o e s not use t h e best available tech­ nology.

42. 55. 52 [6]. The fully saturated conductivity was estimated by pumping test [11] to be 104 ft per day. The hydraulic conductivity at natural saturation is probably about half this value [8, 17], or 52 ft per day. 19)", leading to a value of n of the order of 7. Now one can use Equation (10) to estimate how long it would take for the wetting front to reach the water table at 25 ft below the ground. Substitution of all the values in Equation (10) yields a value of 280 days. Had water continued to be supplied, the wetting front (infiltration) would have reached the water table in 7 days.

3) The integrated form of Equation (2) is Kt = W - Sf\n [ 1 + W j (4) 42 OVERVIEW AND FUNDAMENTAL CONSIDERATIONS providing a relation between cumulative infiltration depth and time and also wetting front depth since W = (6, - 8,) z, (5) Analysis of the field data of Bianchi and Haskell [6] indicates that the Green and Ampt equation is adequate to reproduce the data. The flow beneath the basin was definitely unsaturated. The fully saturated hydraulic conductivity was estimated at 104 ft per day, though this value, estimated from pumping test [11], is not necessarily representative of the vertical hy­ draulic conductivity above the aquifer.

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