The effects of the drought in the Concho Valley and elsewhere are prompting officials to plan a major new program fore developing water resources. The Texas Water Development Board will ask voters next month to approve a constitutional amendment it says is necessary to help meet what’s estimated to be $53 billion in new water infrastructure needs statewide .Known as Proposition Two, the proposed constitutional amendment would allow the state water board to issue additional general obligation bonds provided the total in outstanding debt never reaches more than $6 billion.The $53 billion is needed for new water supplies and would be invested between now and 2050, according to the draft of a state water plan.