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creation of future U«aa and emcembranees against said works or pmp$Mi.m ©©4 %'m revenues thereof, the carryi»g of Insurance m the properties constitoting such works, the disposition of the proceeds of any such Insurance, amI other pertinent matters as may be deemed necessary by the governing body to ensure tbs marketability of soak bonis.? provided, such ocvanents are sot inconsistent with the prowl** •less of this act* mm mjp district shall issue bonds hereunder and shall have pledged the revotuea of any works or properties for the jmyment liter#©£ as herein provided, such district shall impose and collect ratfh and charges for the produets and services furnished by such works or properties in sueh amounts end at such rates as shall be fully sufficient at all tines to pay the expenses of operating and maintaining sueh works or properties, provide a sinking fund suffi­cient to assure tho prompt payment of principal of and interest on the bonds as each falls due, (provides) provide such reasonable fund for contingencies as nay be required by the resolution author!flag'bonds and provide an adequate depreelation fund for sueh repairs, extensions and improvements to the works or properties as nay be necessary to Srilfe assure adequate' and efficient service to the public, m board or eemmisalon other than the governing body of the district and the public service o maniasloo of the atnte of tt evade shall have authority to fix or supervise the making of such rates and charges. The govern- lug body of any district which shall have leaned bonds payable from revenues under the pro visions of this law may (authorise) submit to the electors- of the district a proposal for the leouanoe of bonds for the purpose of refunding such outstanding bonds. Such refunding bonds may either be .sold end the proceeds applied to the retirement of the outstanding, bonds, or nay be delivered In exchange for the outstanding bonds. The refunding bonds shall be authorised in all respecta as original bonds are herein required to- be authorised, mad the governing body in (author!sing) adaption hr resolution, the proposal to he submitted at ear bend election for the refunding bonds shall provide for the security of such bonds and the source from which such bonds are to be paid and for the rights of the holders thereof in all respects as herein authorised to be provided -for other bonds Issued under authority of this act. The governing body may also provide that the