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The real problem, as usual, is the result reached when urbani- zation has dramatically increased the degree and speed of runoff. Because Colorado courts have not yet addressed the particular problem, they still have an opportunity to react to the equities of the radical change caused by urbanization and certainly a plausible response will be to limit the amount of water required to be accepted, if any, to that which has historically occurred. Probably they would follow the direc- tion of their decision in Hankins v. Borland, supra at 1010, "Na tura1 drainage conditions may be al tered by an upper pro- prietor provided the water is not sent down in a manner or quantity to do more harm than formerly." Thus, if a signifi- cant degree of runoff is involved, the ditch company would not have to accept it; the developer or municipality would have to make provision for getting it to a natural drainage way. If the amount of water is small enough to cause no problem, then it could be discharged in the ditch. Apparently, then, complete storm sewerage systems with direct discharge into a major drainageway are the required solution. CONCLUSION The result which we have generally come to on the several issues touched is that proper flood plain management will require a continuing effort at negotiation and acquisition. The Colorado courts have not dealt directly with an acute problem of in- creased runoff by urbanization, and the ultimate allocation of private flood responsibilities is correspondingly unclear. What is clear is that within certuin bounds, the management and con- trol of the drainage facility is consistent with other existing land uses along the relatively undeveloped channels. Perfection of rights and obligations by express agreement is presently possible and offers the path of least resistance to the manage- ment and control of these basins. We are hopeful that this report is responsive to the decision- making needs of the District. If there are further questions, we will be glad to try to answer them. 'c ."