Unnamed Arroyo Watershed Management Plan August, 2009

US 550 HWY Unnamed Arroyo Watershed Management Plan

SPRINT BLVD NE August, 2009

DIMAS WAY NE

JEMEZ DAM

JAGER DR NE

I C Prepared by:

A B KUAUA O Southern S T N E E Sandoval N Y A W County

M U LCR FU Arroyo

E N Flood C H A N T E Control D H IL LS B Authority LV NAZC D O NE N PL (SSCAFCA)

MONTOYA RD NE N 528 HWY NE A Z CON RD e S d B AN O D L LN n D O VA R a E SS r O P FS G

IF R E

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UNNAMED ARROYO WATERSHED MANAGEMENT PLAN TABLE OF CONTENTS PAGE TABLES PAGE ABBREVIATIONS AND DEFINITIONS ………………………………………………………iii Table 1: Comparison of AHYMO and HEC-HMS Results for Selected Analysis Points...... 3 EXECUTIVE SUMMARY………………………………………………………………………. v Table 2: Summary of Proposed Facilities and Improvements...... 6 I. INTRODUCTION ...... 1 Table 3: Phasing Plan for Proposed Improvements...... 8 A. GENERAL BACKGROUND ...... 1 B. PURPOSE AND OBJECTIVES ...... 1 PHOTOGRAPHS C. JURISDICTION ...... 1 Photo 1: Unnamed Arroyo east of NM 528 near the 66” Joiner Pipeline Outfall looking east towards D. REFERENCES ...... 1 Sheriffs Posse Rd...... ii II. CRITERIA AND ASSUMPTIONS...... 1 Photo 2: Erosion, Industrial debris in Unnamed Arroyo just east of NM 528...... 2 A. SSCAFCA GOALS AND COMMITMENTS ...... 1 Photo 3: Downstream looking east of the 2- 8’ x 6’ Concrete Box Culverts at Sheriffs Posse Rd. .... 2 B. CRITERIA AND ASSUMPTIONS ...... 1 Photo 4: Eroded unstable bank East of Sheriffs Posse Rd...... 3 C. QUALITY OF LIFE/WATERSHED PARK INTEGRATION ...... 2 Photo 5: 66” Outfall of the Joiner Pipeline, looking west towards NM 528...... 3 III. EVALUATION AND ANALYSIS ...... 2 Photo 6: Unnamed Arroyo west of Sheriffs Posse Rd., looking west (potential avulsion area)...... 4 A. WATERSHED CHARACTERISTICS ...... 2 Photo 7: NM 528 Pond and Crossing Structure...... 4 B. HYDROLOGY ...... 3 Photo 8: Earthen Channel South of the Rinker Plant...... 4 C. EXISTING FACILITIES ...... 3 Photo 9: Environmental Art as Flood Control: Artist’s concept for a Debris removal inlet structure. . 5 D. PLAN DEVELOPMENT ...... 4 Photo 10: Unnamed Arroyo west of Sheriffs Posse Rd at Joiner Pipeline outfall, looking east IV. RECOMMENDATIONS ...... 6 (downstream)...... 8 A. DRAINAGE IMPROVEMENTS ...... 6 Photo 11: Unnamed Arroyo west of Sheriff’s Posse Rd. near Joiner Pipeline outfall, looking west B. RIGHT-OF-WAY REQUIREMENTS ...... 7 (upstream)...... 8 C. WATERSHED PARK / MULTI-USE FACILITIES ...... 7 D. IMPLEMENTATION PLAN ...... 8 APPENDICES APPENDIX A – FIGURES J:\SSCAFCA\277262 unnamed arroyo\Final Report\Unnamed Arroyo WMP 8_11_09.doc 1. SSCAFCA Jurisdiction Map 2. Location / Reference Map 3. Soils Map 4. Topography Map 5. Drainage Basin Map 6. Hydrology Map 7. Existing Drainage Facilities Map 8. Proposed Drainage Facilities Map 9. Property / Right of Way Map 10. Potential Watershed Park Components Map 11. Water Quality Facility Concept APPENDIX B – WATERSHED PARK AMENITIES AND HABITAT ENHANCEMENT APPENDIX C – HYDROLOGY APPENDIX D – CALCULATIONS APPENDIX E – DIGITAL FILES ON CD (IN POCKET) 1. HEC-HMS models 2. AHYMO models 3. Supporting Calculations 4. GIS files

Photo 1: Unnamed Arroyo east of NM 528 near the 66” Joiner Pipeline Outfall looking east towards Sheriffs Posse Rd.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) ii

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN ABBREVIATIONS & DEFINITIONS

Ac Acre DMP Drainage Master Plan AF acre-feet of runoff (volume of water covering one acre, one foot deep) DPM Development Process Manual AHYMO Arid Lands Hydrologic Model Drainage Basin Runoff areas, which flow to a specific facility. A document for the purpose of describing the existing drainage conditions, predicting Antiquated Areas platted as part of Rio Rancho Estates in the 1960s. Drainage Report the effects of land use or other changes and proposing solutions to address the Platting drainage environment. Ephemeral stream in arid or semiarid southwestern U.S. typically with a flat Arroyo Environmental Art Art that helps improve the community's relationship with the natural world floored channel and vertical or steeply cut banks that is usually dry. Unnamed Arroyo reference document number XX. See reference UARD XX EPA Environmental Protection Agency documents opposite Figure 2 in Appendix ‘A’. Runoff based on development, surface modifications and construction in place at the UAWMP Unnamed Arroyo Watershed Management Plan Existing Runoff time of analysis. Extended A water quality technique of detaining stormwater for an extended period to allow BMP Best Management Practice Detention sunlight, wind action, etc., to reduce pollutants. Any structure, levee, dike, diversion channel, storm drain, pond, pumping station, The development category of a facility: Existing, Proposed, Upgrade, or Category Facility detention facility or dam, either natural or manmade, which has the function of Natural conveying, containing, directing or storing stormwater runoff. CBC Concrete Box Culvert Facility Name The commonly referenced name for the facility. A drainage study or design analysis of a specific facility, usually limited to a specific cfs cubic feet per second – flow rate Facility Plan drainage basin or sub-basin. More detailed than a Drainage Master Plan or Watershed Management Plan. cfs/Ac cubic feet per second per acre FEMA Federal Emergency Management Agency Grouping of proposed and existing facilities in a context, which is used to Classification FIRM Flood Insurance Rate Map prioritize funding needs or other administrative activity. A general and temporary condition of partial or complete inundation of two or more acres of normally dry land or two or more properties from: Clear Water Runoff with minimal sediment (3% or less) Flood -Overflow of inland or tidal waters Discharge -Unusual and rapid accumulation or runoff of surface waters from any source -mud flow. Any land area susceptible to being inundated by flood waters from any source. (FEMA CMP Corrugated Metal Pipe Floodplain Definition) CORR City of Rio Rancho fps feet per second COE United States Army Corps of Engineers Free Discharge Runoff without peak flow and/or volume attenuation. CY Cubic yard GIS Geographic Information System The flow rate in cfs that the facility was designed for. This assumes that Larger particles of litter, vegetative debris, floatable debris and course sediments in Design Q freeboard and other factors were included in the design. This is not the Gross Pollutants stormwater runoff. “bank full” capacity. The fully developed flow rate incorporating proposed facilities in the Developed Q HEC-HMS Hydrologic Engineering Center Hydrologic Modeling System Watershed Management Plan. Detention Collection, temporary storage and controlled release of runoff. Runoff based on “pre-development” conditions. For the purposes of this plan, historic Historic Runoff runoff is interpreted as without buildings, pavements, mass grading, diversions, etc. DEVEX Developed conditions/existing platting/existing facilities but including the impacts of grazing, bladed roads, etc.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) iii

A sculpture, drawing, painting or print, existing in a single copy or in a limited Interpretive Art Facility intended for sediment, erosion, and flood control, which is constructed less edition of 200 copies or fewer signed and consecutively numbered by the Stormwater Pond Elements than 10 feet in height or can store less than 10 ac-ft of water. artist/author. Major Drainage Drainage basins within a given watershed, which define the runoff into trunk SWQ Stormwater Quality Basin or major facilities. Facilities which generally meet one or more of the following criteria: Convey Major Facilities in excess of 500 cfs, are regional in nature; divert runoff; create drainage Upgrade (U) The proposed improvement or upgrade of an existing facility.

divides, pump stations; dams, public ponds. Natural Existing historic arroyo or drainage course in the currently evolved natural USGS United States Geological Survey Conveyance state established by natural forces. Constructed channel, swale or other conveyance system designed, and Naturalistic Ultimate operated to maintain the appearance and aesthetic feel of a natural system. Representing full build out with permanent facilities. Conveyance Development (native soils, native vegetation, meanders, variable widths, variable slopes) NOAA National Oceanographic and Atmospheric Administration UNM University of New Mexico

Non-Structural Drainage and water quality management practices that do not depend on Vwq Water quality treatment volume BMP physical structures, such as education programs. A comprehensive drainage area usually incorporating several drainage basins, National Pollutant Discharge Elimination System. EPA permit program to NPDES Watershed typically with an outfall directly to the Rio Grande or into an independent system which reduce pollution in waters of the US. conveys the watershed runoff to the Rio Grande. Watershed A comprehensive study of the drainage characteristics of a watershed establishing the O&M Operation and Maintenance Management Plan plan for managing drainage within the watershed. (also referred to as Drainage

(WMP) Management Plan) An interconnected linear park system promoting quality of life amenities using flood PNM Public Service Company of New Mexico Watershed Park control right of way to maximize community value. A new recommended facility (as differentiated from the upgrade of an Proposed Facility YY_WW_ZZX Facility Identifier (Reduced version of GIS database Identifier) existing facility). Q Flow rate, cfs YY – Section Number (Township 13N, Range 3E for the Unnamed Arroyo Watershed)

Watershed Identifier: BA – La Barranca Watershed NM – NM 528 Watershed BL – Black Arroyo Watershed RR – Rio Rancho Urban Center CA – Calabacillas Arroyo Watershed UA – Unnamed Arroyo Watershed RCP Reinforced Concrete Pipe WW – CO – Coronado State Park Watershed UW – Un-named Wash Watershed CE – Corrales East of Main Canal Watershed VE – Venada Arroyo Watershed CW – Corrales West of Main Canal Watershed ZI – Zia Watershed MO – Montoyas Arroyo Watershed ROW Right-of-way ZZ- Facility Number within Section YY

Type of Facility: A – Natural Arroyo B – Bank Protection C – Channel D – Dam E – Environmental G – Grade Control SSCAFCA Southern Sandoval County Arroyo Flood Control Authority X – I – MRGCD Irrigation Structure L – MRGCD Drain Ditch

M – Miscellaneous N – Facility Plan O – O&M Facility P – Pond R – SSCAFCA Rain Gauge S – Storm Drain V – Vegetation X – Crossing Structure

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) iv Executive Summary of the Unnamed Arroyo Watershed Management Plan

SSCAFCA staff, in cooperation with WHPacific and the Town of UNNAMED ARROYO WATERSHED PLAN SUMMARY TABLE Bernalillo, has prepared a Watershed Management Plan for the CONCEPT LOCATION ISSUES RECOMMENDATIONS Unnamed Arroyo Watershed. This area has several drainage ESTIMATE* issues including a potential avulsion, soil erosion and sediment 1 Ponds at 528 ● Ownership unknown ● Verify/Obtain public ownership $100K concerns, ROW and access concerns, and a lack of storm water ● No storm water quality controls ● Install trash removal structures quality controls. As the area continues to develop, it is critical to 2 Earthen Channel ● Private ownership ● Obtain public ownership $300K have a plan in place to address these issues. south of Rinker Plant ● Long term O&M issues ● Install storm drain (48", 1800' +/-)

The Plan provides the following: 3 Pond 205 ● Private ownership ● Abandon Pond, allow discharge to 66" n/a • 100 year flood protection to improve the health, safety and ● O&M issues resulting in standing storm drain water/mosquitoes (SSCAFCA will pursue Benefit Recovery welfare of the public, with the property owner) • Reduction of soil erosion, • Cost sharing of operations & maintenance, 4 Arroyo West of ● Mixed public/private/unknown ROW ● Verify/Obtain public ownership $700K • Improved storm water quality, Sheriff's Posse Rd. ownership ● Install storm drain (66", 2000' +/-) with a ● Erosion from “sediment starved" water transition to the 2 - 8'x6' CBC • Multi-Use / Watershed Park amenities, coming out of the pipe ● Provide multi-use access/wildlife habitat • Habitat restoration and environmental art as an educational ● Potential Avulsion along the corridor resource for the community. 5 Nazcon Rd. Near ● Driving sight issues ● Raise Road $100K Figures showing the Drainage Improvements (Figure 8), ROW Arroyo at Sheriff's ● Doesn’t drain well ● Address street drainage w/inlets or Requirements (Figure 9), Watershed Park Concept (Figure 10), and Posse Rd. other conveyance Multi-Use Water Quality Facility with wildlife habitat (Figure 11) can 6 Sewer line East of ● Shallow crossing the Arroyo, history of ● Reroute sewer line n/a be found in Appendix A. Sheriff's Posse Rd. breakage (Coordinate with the Town) 7 Water Quality Facility ● Minimal water quality controls in the ● Purchase property $1,000K The recommended improvements in the plan have a total downstream of watershed ● Water Quality/ Habitat/ Multi-use conceptual construction cost of approximately $5.3 million, plus an Sheriff’s Posse Rd. Facility (includes diversion, piping, debris estimated $1.0 million for approximately 5 acres of property structure, pond/riparian area, arroyo acquisition. Details about the recommended improvements are connection) included in the summary table to the right. 8 Arroyo East of ● Inadequate storm water capacity ● Verify/Obtain public ownership $700K Sheriff's Posse Rd. ● Unstable conditions ● Stabilize Arroyo (naturalistic with grade Recommended actions include: (sediment erosion/deposition & meander) control drop structures) with wildlife corridor and environmental art education • Acceptance of the Plan by all parties. components • SSCAFCA/Town of Bernalillo coordinate to purchase the 9 Outfall of Arroyo at ● Unstable condition into river (erosion ● Outfall Structure (naturalistic with $600K right-of-way required for implementation of the Plan. the River potential) concrete boulders, scour protection) with multi-use wildlife view overlook • Pursue Funding to implement the Plan Subtotal = $3,500K

Contingency/Engineering/Testing/Survey (50%) = $1,800K

$5,300K CONSTRUCTION TOTAL = $1,000K PROPERTY (5 Ac +/-) = TOTAL COST = $6,300K

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) v

D. REFERENCES I. INTRODUCTION Available reports and plans for existing and proposed developments and facilities within A. GENERAL BACKGROUND the watershed were assembled and reviewed and have been included in the development of the UAWMP. These reference documents are shown in the text as The Unnamed Arroyo Watershed Management Plan (UAWMP) was prepared by the UARD XX and are listed opposite Figure 2 and are available at the SSCAFCA office. Southern Sandoval County Arroyo Flood Control Authority (SSCAFCA) in conjunction with the Town of Bernalillo and other stakeholders within the watershed. The upper II. CRITERIA AND ASSUMPTIONS reach of the watershed is located in the City of Rio Rancho; the lower reach is within the Town of Bernalillo (Figure 1 in Appendix ‘A’). The 290 acre watershed discharges A. SSCAFCA GOALS AND COMMITMENTS directly to the Rio Grande and is mostly industrial/commercial development. As the area continues to develop, it is critical to have a plan in place to address current and future • To provide flood protection up to the 100-year storm for the public health, safety and drainage issues. welfare of residents and properties within its boundaries; • To recognize the value of land purchased or controlled for floodways as areas with B. PURPOSE AND OBJECTIVES multi-use potential; • To reduce sediment and erosion within the boundaries of the flood control authority; The overall purpose of the UAWMP is to and 1. Identify drainage related problems in the watershed. • To assist in the coordination of flood control with other entities for the common good of the public. 2. Plan regional drainage improvements necessary to properly protect private

structures and the public from flooding up to the 100 year event, The criteria for the Unnamed Arroyo Watershed Management Plan were developed 3. Plan improvements necessary for water quality to protect the Rio Grande, and consistent with the SSCAFCA goals. The main objectives are: B. CRITERIA AND ASSUMPTIONS • To establish a framework for drainage management including: The UAWMP conforms to the SSCAFCA drainage policy adopted in June 2008. The o Watershed and sub-basin boundaries and hydrology; data, criteria and assumptions used to develop the UAWMP are listed below: o Existing drainage facilities and capacities; o Proposed futures drainage facilities; • Mapping was performed using 2009 aerial photography and 2009 contours with a 2’ interval (Figures 4 & 5). o Proposed storm water quality facilities; o Potential drainage right-of-way requirements; • Platting and zoning information was obtained from Sandoval County GIS and from o Incorporation of watershed park and multi-use components. the Town of Bernalillo. The information is schematic in nature and does not represent surveyed property lines. • To provide a basis for facility design and agency review of future development in the watershed. • Unnamed Arroyo Hydrology. The basis for development of the Unnamed Arroyo Watershed hydrology was the • To incorporate stakeholder input. SSCAFCA DPM (UARD 8), specifically: • To develop recommendations and an implementation plan for addressing o The 100-year 24-hour rainfall event was used as the design storm (2.9” inches of drainage related issues. rainfall in 24 hrs) C. JURISDICTION o Methodologies set forth in the SSCAFCA DPM (UARD 8) were used to quantify land use parameters, rainfall loss, rainfall excess and unit hydrographs as well as The watershed is within Sandoval County, the SSCAFCA jurisdictional boundary, the for hydrologic routing. Both AHYMO 97 and HEC-HMS modeling software were City of Rio Rancho, The Town of Bernalillo, and Santa Ana Pueblo, as shown in Figure used. 2 in Appendix ‘A’. o Sediment bulking factors of 6% for developed areas and 18% for undeveloped lands were incorporated into the hydrologic models; hydrographs were unbulked by 3% in dam outfalls to account for sediment deposition in detention ponds.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 1

o Storm Water Quality structures and components are assumed to be plugged III. EVALUATION AND ANALYSIS (non-functioning). A. WATERSHED CHARACTERISTICS o Additional hydrology criteria & assumptions are included in Appendix ‘D’. • Storm Water Quality (SWQ). The Unnamed Arroyo Watershed is located between the Venada Arroyo Watershed to SWQ Criteria conforms to SSCAFCA’s Drainage Policy Amendments 2004-1 and the south and US Highway 550 to the north (see Figure 1 in Appendix ‘A’), and is about 2004-2 (UARD 11 and 12): 290 acres.

o Storm Water Quality Volume = the first ¼ inch of runoff, storm water discharge rate = flow from the average annual storm event (0.6” inches of rainfall) Historically, the drainage basin boundary of the Unnamed Arroyo, as well as the arroyo itself, extended further to the west. In conjunction with the Enchanted Hills Subdivision, o Reduce, to the maximum extent practicable, floatables, debris, sediment, and The Encantado Channel, which runs along Fulcrum Way, was constructed to divert micro pollutants generated by this runoff. flows to the neighboring Venada Arroyo to the south. This diversion reduced the overall o Accommodate or bypass the 100 year flood event. size of the Unnamed Arroyo Watershed and the Encantado Channel now serves as the o Minimize re-introduction of collected pollutants. current upper watershed boundary.

• Permits The entire watershed area has been platted, and approximately 60 percent of the area A USACOE 404 permit may be required for construction work within the arroyo and is currently developed. West of NM 528, the predominant land use is commercial at the outfall to the river, development or vacant commercial lots. Subsequent to the completion of the Encantado • Property Channel, the Unnamed Arroyo west of NM 528 was filled in. Several existing ponds The Plan assumes SSCAFCA will acquire fee simple or easement Right(s)-of-Way along NM 528 attenuate flows from the upper portion of the watershed. ownership of publicly owned and maintained storm water facilities. The area east of NM 528 is a mixture of commercial, light industrial and residential C. QUALITY OF LIFE/WATERSHED PARK INTEGRATION development with some areas of open space. Stormwater east of NM 528 flows through a storm drain pipe with a 66” outfall that drains into the only remaining natural, earthen In accordance with SSCAFCA’s commitment to recognize the value of land purchased reach of the Unnamed Arroyo, which then discharges into the Rio Grande. or controlled for floodways as areas with multi-use potential, the following goals were incorporated in the development of the UAWMP: Photo 2: Erosion, Industrial debris in • Implement standards to safely combine drainage ROW & Watershed Park Facilities. Unnamed Arroyo just east of NM 528. • Incorporate appropriate Watershed Park elements defined in the Quality of Life Master Plan (UARD 9). Details about recommended Watershed Park elements are discussed in Section IV. C of this report, on Figures 10 and 11 in Appendix ‘A’ and in Appendix ‘B’.

Watershed Park Concept

Photo 3: Downstream looking east of the 2- 8’ x 6’ Concrete Box Culverts at Sheriffs Posse Rd.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 2

The soils in the Unnamed Arroyo Watershed are predominately loamy sands that are HEC-HMS model were utilized for the identification of issues and recommendations in very erosive. Figure 3 in Appendix ‘A’ shows the distribution of different soil types this Watershed Management Plan. HEC-HMS results from the EXISTING, DEVEX and throughout the watershed area. Soil data was obtained from the NRCS (U.S. ULTIMATE models are summarized in the table adjacent to Figure 6 in Appendix ‘A’. Department of Agriculture, Natural Resources Conservation Service). Soil types found Flows and volumes at three locations for DEVEX condition are shown in the following in the watershed include: table for comparison: • 98% Sheppard loamy fine sands, 3 to 8 percent slopes • 1% Trail loamy sand, 0 to 1 percent slopes Table 1: Comparison of AHYMO and HEC-HMS Results for Selected Analysis Points. • 1% Glico loam, 1 to 4 percent slopes, unprotected AHYMO 97 RESULTS HEC-HMS RESULTS Analysis LOCATION FLOW VOLUME FLOW VOLUME Point (cfs) (AF) (cfs) (AF) 107.9 Joiner Pipeline Outfall 110 15.0 120 16.1 303 Sheriffs Posse Rd 579 52.9 580 56.4 304 Rio Grande Outfall 609 54.1 605 57.5

C. EXISTING FACILITIES

Details of the existing facilities are shown on Existing Drainage Facilities Map, Figure 7

in Appendix ‘A’. Each facility is assigned a unique GIS identification number conforming Photo 4: Eroded unstable bank East to SSCAFCA GIS protocol, based on its location and the facility type. Technical data

of Sheriffs Posse Rd. pertaining to each existing facility is summarized in the table on the page adjacent to the

map. Existing facilities include the following: B. HYDROLOGY • Ponds on west side of NM 528, • An NM 528 crossing structure (60” CMP) near US 550, The hydrology for the UAWMP was developed using the criteria in Section II. B. • An NM 528 crossing structure (4 – 36” CMP) near Enchanted Hills Blvd, Drainage basins are shown in Figure 5 in Appendix ‘A’. Three hydrologic models were • An Earthen Channel south of the Rinker Pipe Plant, developed to identify drainage related problems in the Unnamed Arroyo Watershed: • A 48” to 66” storm drain in the arroyo, referred to as the Joiner Pipeline, • The Existing Conditions (EXISTING) model assumes existing development and • Pond 206 downstream of the RV park, perched above the arroyo, existing facilities and is used to identify current drainage related deficiencies. • A Sheriffs Posse Road crossing structure (2 – 8’ x 6’ CBC) in the arroyo. • The Developed Conditions – Existing Facilities (DEVEX) model assumes full development of the watershed with existing drainage facilities; it is used to identify potential future deficiencies. The developed basin boundary varies slightly from the existing basin boundary based on proposed future development.

• The Ultimate Conditions (ULTIMATE) model assumes full development of the watershed as well as the implementation of all facilities and improvements recommended in the UAWMP. For the hydrologic models, the study area was divided into sub-basins with analysis points located at the downstream end of each sub-basin. Peak flow rates and runoff volumes were computed for each analysis point using the computer programs AHYMO (version 97) and HEC-HMS (version 3.3). The HEC-HMS model results are shown in Appendix ‘C’ and digital copies of both models are included in Appendix ‘E’. HEC-HMS results for both peak flows and volumes are typically slightly higher than the results obtained by using the AHYMO program. The typical difference between the two varies between five and eight percent for the different sub-basins. Only results from the Photo 5: 66” Outfall of the Joiner Pipeline, looking west towards NM 528.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 3

As mentioned in Section III. A of this report, the portion of the Unnamed Arroyo D. PLAN DEVELOPMENT historically located west of NM 528 was filled in after the Encantado Channel diversion was constructed. East of NM 528, a reach of the original arroyo of approximately 2000 Based on field investigations, the evaluation of the existing and developed conditions feet length is now conveyed in the Joiner Pipeline. Downstream of the Joiner Pipeline’s hydrology and in cooperation with the Town of Bernalillo, drainage related issues were 66” outfall, the remaining reach of the Unnamed Arroyo is an earthen conveyance with a identified for the Unnamed Arroyo Watershed. These issues and the recommended flat, sandy bottom. The arroyo can be categorized in three segments: solutions are shown on Figure 8 in Appendix ‘A’ and also described below. Related calculations are included in Appendix ‘D’. • From the Joiner Pipeline’s 66” outfall to Pond 206 (Figure 7), the arroyo is deeply incised with steep sides and high banks (ten feet to in excess of 20 feet depth). 1. Ponds at NM 528 • From Pond 206 to Sheriffs Posse Rd., the arroyo is fairly shallow; in some places, • Issues: Current ownership of the ponds is unknown. The ponds are located off the southern bank is less than two feet high. The arroyo bed is higher than adjacent of NM 528 but lack water quality controls. natural ground, resulting in the potential for avulsion of the arroyo out of the current • Solution: Verify/Obtain public ownership of the ponds. Install a Trash Removal alignment. structure with an Oil/Water Separator at each outfall to address water quality and • From Sheriffs Posse Rd. to the river outfall, the arroyo transitions from wide and to limit the flow of debris down to the main arroyo. shallow to narrow and deep; at the outfall, there is a 6’ to 10’ drop to the Rio Grande. • Estimated Construction Cost: $100K

2. Earthen Channel south of Rinker Plant • Issues: Currently on privately owned property downstream of an industrial area. There are issues with debris accumulating in the open channel and there is also potential for erosion because it is unlined, contributing to long term O&M issues. • Solution: Obtain public ownership of the drainage conveyance corridor and install storm drain (48", 1800' +/-) with inlets to reduce O&M concerns and to prevent further erosion.

• Evaluation of Alternatives: Hard lining the channel was also evaluated; however, open channels still have the same O&M and public safety concerns as the existing earthen channel. Storm drain provides a lower maintenance, cost effective solution when compared to a hard lined channel at this location. • Estimated Construction Cost: $300K

Photo 6: Unnamed Arroyo west of Sheriffs Posse Rd., looking west (potential avulsion area).

In addition to the existing drainage facilities there are also some utilities that cross the arroyo, including a gas pipeline near the RV Park and a sewerline east of Sheriffs Posse Rd. These are also shown on Figure 7 in Appendix ‘A’. Photo 7: NM 528 Pond and Crossing Structure.

Photo 8: Earthen Channel South of the Rinker Plant.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 4

3. Pond 206 6. Sewerline East of Sheriffs Posse Rd. • Issues: This is a privately owned pond that is perched above the Unnamed • Issues: The shallow buried sanitary sewer line that crosses the Unnamed Arroyo Arroyo. The pond is in poor condition with known O&M issues, including standing east of Sheriffs Posse Road (Figure 7) has a history of breakage. water that can attract mosquitoes. • Solution: Reroute the sewer line. This action is included in the Town’s long term • Solution: Abandon the pond and allow discharge into the recommended utility plan. extension of the 66" storm drain (see Item D.4 in this section). • Estimated Construction Cost: n/a (Coordinate with the Town) • Estimated Construction Cost: Removing this pond provides a benefit to the owner of the pond. SSCAFCA should pursue Benefit Recovery with the property 7. Multi-Use and Storm Water Quality Facility downstream of Sheriffs Posse Rd. owner. • Issues: Minimal storm water quality controls in the watershed, there is available land for a water quality facility just east of Sheriffs Posse Rd, but development 4. Unnamed Arroyo West of Sheriffs Posse Rd. may limit options in the near future. • Issues: The conveyance path for the Unnamed Arroyo through this area is a mix • Solution: Pursue property acquisition at the proposed location (see Figure 9). of public, private, or unknown ROW ownership. The “sediment starved" water Construct a Multi-use Water Quality Facility that includes wildlife habitat and coming out of the existing 66” pipe is causing O&M issues as a result of erosion educational and artistic elements. The Facility would consist of the following and debris from the surrounding industrial areas. There is also a potential components (Figure 11): avulsion area near Nazcon Rd., where the land south of the arroyo is lower than the arroyo itself. In high flow events this could cause storm water to escape the o Low-Flow Diversion piping/channel - The first ¼ inch of runoff will be arroyo and form a new flow path through these lower areas. diverted out of the main arroyo at the Sheriffs Posse Rd. box culverts and into the Storm Water Quality “Dry” Extended Detention Pond Habitat, with • Solution: Verify/Obtain public ownership of the entire drainage conveyance the remaining runoff continuing down the arroyo. For the Unnamed Arroyo corridor and extend the storm drain (66" to 96”, 2000' +/-) with a transition to the Watershed, the ¼ inch of runoff is equivalent to approximately 6 AF of two 8’x6’ box culverts at Sheriffs Posse Rd. in order to reduce erosion, debris, runoff volume. and O& M issues as well as to eliminate the potential avulsion. The storm drain ROW provides an opportunity for multi-use access and wildlife habitat along the o Debris removal inlet structure – Prior to water entering the storm water drainage corridor. quality pond, a debris removal structure will separate out floatables, trash and tumbleweed and will include access for O&M purposes. Options for • Evaluation of Alternatives: The options of stabilizing or hard lining the arroyo the debris removal include the use of bar grates, Coanda screens, baffles, were also evaluated. The steep slopes and “sediment starved” water have or some combination of these types of treatments. The structure itself will caused erosion, O&M issues, and public safety concerns. Storm drain is the best have added value by including environmental art education and wildlife solution to address the concerns in this area. habitat. • Permitting: The construction of this facility may require a USACOE 404 permit. o Storm Water Quality “Dry” Extended Detention Pond Habitat – A runoff Timing and coordination to complete a permit should be considered during the volume of approximately 6AF will be detained in the storm water quality design process. pond to aid in removal of sediment and micropollutants (pathogens, nutrients, dissolved and suspended solids, metals, etc). • Estimated Construction Cost: $700K o Oil water separator/outlet structure – An outlet similar to the Debris 5. Nazcon Rd. Near arroyo at Sheriffs Posse Rd. removal structure, but at a smaller scale, will remove hydrocarbons from • Issues: The elevation of Nazcon Road west of the intersection with Sheriffs the system before returning flow to the arroyo. Posse Road is below the elevation of the Unnamed Arroyo has driving sight o Return-Flow piping/channel – Returns clean water to the arroyo. issues at the Sheriffs Posse Rd. intersection and the drainage along the roadway • Estimated Construction Cost: $1,000K ($1 Million) is also inadequate.

• Solution: The storm drain extension (see Item D.4 in this section) resolves the elevation issues with the arroyo. Raising Nazcon Rd for driving visibility purposes and providing adequate street drainage is also recommended. Photo 9: Environmental Art as Flood Control: • Estimated Construction Cost: $100K Artist’s concept for a Debris removal inlet structure.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 5

8. Unnamed Arroyo East of Sheriffs Posse Rd. IV. RECOMMENDATIONS • Issues: The arroyo capacity in this area is insufficient to convey the 100 year 24 hour storm flows for either existing or developed conditions. The arroyo has A. DRAINAGE IMPROVEMENTS unstable conditions (sediment erosion/deposition, meander, unstable banks). The following table summarizes facilities/improvements recommended for the Unnamed • Solution: Stabilize the arroyo using naturalistic grade control drop structures or Arroyo Watershed, along with cost estimates and priority rankings: similar. The arroyo in this location connects directly to the Rio Grande, providing Table 2: Summary of Proposed Facilities and Improvements. a unique opportunity to educate people about flood control and environmental matters; it is also recommended to design this as a wildlife corridor with CONCEPT LOCATION RECOMMENDATIONS PRIORITY environmental art education elements to benefit the community. ESTIMATE* ● Verify/Obtain public ownership • Evaluation of Alternatives: The options of hard lining the arroyo or installing a 1 Ponds at 528 $100K L storm drain were also evaluated. The 130’ +/- drainage right-of-way provides ● Install trash removal structures adequate room for stabilization and watershed park amenities, which fulfills the Earthen Channel ● Obtain public ownership 2 $300K M goals of the Quality of Life plan. south of Rinker Plant ● Install storm drain (48", 1800' +/-) • Permitting: The construction of this facility may require a USACOE 404 permit. ● Abandon Pond, allow discharge to 66" Timing and coordination to complete a permit should be considered during the storm drain 3 Pond 205 n/a M design process. (SSCAFCA will pursue Benefit Recovery with • Estimated Construction Cost: $700K the property owner) ● Verify/Obtain public ownership Unnamed Arroyo ● Install storm drain (66" to 96”, 2000' +/-) Grade control drop 4 West of Sheriffs with a transition to the 2 – 8’x6’ CBC $700K H structures with Posse Rd. ● Provide multi-use access/wildlife habitat multi-use paths along the corridor Nazcon Rd. Near ● Raise Road 5 arroyo at Sheriffs ● Address street drainage w/inlets or other $100K M Posse Rd. conveyance Sewerline East of ● Reroute sewerline 6 n/a H Sheriffs Posse Rd. (Coordinate with the Town) ● Purchase property at one of two possible site locations Storm Water Quality ● Water Quality/ Habitat/ Multi-use Facility 7 Facility downstream $1,000K H (includes diversion. piping, debris structure, of Sheriffs Posse Rd. pond/riparian area, environmental art as flood control, outlet and educational components) ● Verify/Obtain public ownership Unnamed Arroyo ● Stabilize Arroyo (naturalistic with grade 8 East of Sheriffs control drop structures) with wildlife corridor $700K H Posse Rd. and environmental art as flood control and 9. Outfall of Unnamed Arroyo at the River educational components • Issue: The arroyo is perched 6’ to 10’ above the river, and the connection into ● Outfall Structure (naturalistic with Outfall of Unnamed the river is unstable with potential for erosion. 9 concreted boulders, scour protection) with $600K H Arroyo to the River • Solution: Construct a naturalistic outfall structure/rundown ramp (concreted multi-use wildlife view overlook boulders or similar), scour protection and a multi-use wildlife viewing CONSTRUCTION TOTAL(w/contingency) = $5.3 Million

ramp/overlook (Figure 11). PROPERTY TOTAL(5 Ac +/-) = $1 Million

• Estimated Construction Cost: $600K UAWMP TOTAL= $6.3 Million

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 6

The estimated construction cost (including Engineering, Testing, and Survey) for all the The intent of “Environmental Art as Flood Control” is to integrate environmental art into improvements in the Unnamed Arroyo Watershed is $5.3 Million. The estimated cost of the flood control and stormwater quality function without increasing cost. The Plan property acquisition is $1 Million. The total cost for property and improvements in the incorporates artist concepts and wildlife habitat interpretive art elements into the watershed is $6.3 Million. Unnamed Arroyo Watershed flood control and stormwater quality function. Lynne Hull, an internationally recognized environmental artist, provided concepts and ideas from a Details of all proposed facilities and improvements are shown on Proposed Drainage fresh perspective, which are integrated into this Plan. Ms. Hull also provided examples Facilities Map, Figure 8 in Appendix ‘A’. Each facility is assigned a unique GIS of “interpretive art elements” for educational and human habitat enhancement. identification number based on its location and the facility type. Technical data pertaining to each proposed facility is summarized in the tables on the page adjacent to Additional data and details regarding “Environmental Art as Flood Control”, Watershed Figure 8. Park Amenities, and Habitat Enhancement are included in Appendix ‘B’.

B. RIGHT-OF-WAY REQUIREMENTS

Property information and right-of-way requirements are shown on Figure 9 in Appendix ‘A’. Approximately five acres of land are needed for the storm water quality treatment facility (see Figure 9).

In addition, public ownership of all drainage conveyances and publically maintained storm water retention/detention areas should be obtained.

C. WATERSHED PARK / MULTI-USE FACILITIES

The UAWMP includes the “next generation” of the Multiple-Use and Watershed Park

concepts by including “Environmental Art as Flood Control” in the overall system.

Watershed Park and Multiple-Use elements, including environmental art, improve

quality of life and add community value, as illustrated in the Hydro “Logic” Cycle concept

image below.

Unnamed Arroyo Environmental Art as Flood Control Concept:

A Ramp Overlook connected to the Arroyo Rundown near the Rio Grande.

The following Watershed Park/Multi-Use facilities are recommended for implementation

within the existing and proposed drainage right-of-way in the Unnamed Arroyo

Watershed, as shown on Figures 10 & 11 in Appendix ‘A’:

• A trail system connecting the Enchanted Hills area and the Rio Grande Bosque with trail heads at NM 528 and at Sheriffs Posse Road. • A multi-use storm water quality facility south of the Unnamed Arroyo and east of Sheriffs Posse Road. The facility might include riparian/ Bosque habitat, vegetation, wildlife refuge, trees, educational elements, integrated aesthetics, and passive recreation such as trails and picnic tables; it would serve as an amenity for the community • A wildlife corridor between the Rio Grande Bosque and the storm water quality facility extending west of Sheriffs Posse Rd.

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 7

D. IMPLEMENTATION PLAN

Implementation and funding of the UAWMP will compete with other drainage needs, as well as other public programs, and is expected to take years to complete. The following phasing plan is recommended:

Table 3: Phasing Plan for Proposed Improvements.

PHASE TASK TO BE IMPLEMENTED LEAD AGENCY SSCAFCA/ 1 ROW acquisition Town of Bernalillo Reroute sanitary sewer line that crosses the 2 Town of Bernalillo Unnamed Arroyo east of Sheriffs Posse Road

Design and Construction of conveyance improvements, multi-use water quality facility and SSCAFCA/ 3 trails east of Sheriffs Posse Road, as well as the Town of Bernalillo outfall structure at the river Design and Construction of conveyance SSCAFCA/ 4 improvements and trails west of Sheriffs Posse Town of Bernalillo Road Design and Construction of storm drain south of SSCAFCA/ Photo 10: Unnamed Arroyo west of Sheriffs Posse Rd at Joiner Pipeline 5 Rinker plant City of Rio Rancho outfall, looking east (downstream).

Other recommended improvements (abandon SSCAFCA/ 6 pond 206, retrofit ponds 106 and 203 for water City of Rio Rancho/ quality, raise Nazcon Road) Town of Bernalillo

Photo 11: Unnamed Arroyo west of Sheriff’s Posse Rd. near Joiner Pipeline outfall, looking west (upstream).

UNNAMED ARROYO WATERSHED MANAGEMENT PLAN (AUGUST 2009) 8 SSCAFCA Jurisdiction Map

Z ia W at ershed Legend

550 SSCAFCA Boundary M Unnamed o Arroyo Watershed Boundary n ada Ar t Ven roy Unnamed Arroyo Watershed o o W Watershed y a a te City of Rio Rancho s PR rs OG L h Town of Bernalillo A RES a r S BLVD e C B d ro a Village of Corrales al KING BLVD y r o ra ab n Pueblo of Sandia W ca

CALL E B AR RI O NU EVO

000 a UNK NOWN RIO RA NCHO OB CALL E D ON E RN EST O BEE HI VE Pueblo of Santa Ana

L I N LP NE L NTA E W U B

D O a M A E S C I U 29TH AVE NW R O SP N I M K DR NE CALL E C HA PAR RELA A PE C T A H N I G LAZO E SCO ND ID O U L N G SU A W A L I N 28TH AVE NE L E E L L L O L W E A E C

UNSERBLVD V C I R R c E MA E

K t R BOSQUE D

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E M AW IL a S L

L e i te l B r Pueblo of Zia l s rs as h W h e O e d IR B E IS d N N R 19TH AVE NW I A A D R T IDALIA RD r S r

o T Unnamed

0 y 10TH ST NE

40TH ST NW o 528 HWY Wash

30TH ST NE NORTHERN BLVD 10TH ST NW W B Watershed 44 l 8 a a 20TH ST NW H

t c W e k Y r I-25 SANDIA BLVD s A h r e r d o y Feet o 0 5,000 10,000 W SOUTHERN BLVD

S W

30TH ST SW

T a

S t

H e Corrales Unnamed Arroyo T

10TH ST SE 0 rs 5 h East & West Watershed Management Plan 19TH AVE SW 19TH AVE SE e

10TH ST SW 40TH ST SW Sandoval County d Watersheds SSCAFCA Jurisdiction Map

Bernalillo County Rio Rancho NM528 Urban Center Date: August 2009 Watershed Watershed Figure 1 of 11 Unnamed Arroyo Watershed Management Plan Reference Documents

Ref Title Prepared By Prepared For Date UARD 1 Home Depot Grading and Drainage Plan Tierra West, LLC Tierra West, LLC Dec-03 UARD 2 Enchanted Hills Subdivision Master Drainage Plan Huitt-Zollars, Inc. AMREP Southwest Nov-00 UARD 3 Site Plan Application Plaza at Enchanted Hills A through I UARD 4 Lomas Encantadas Drainage Management Plan Huitt-Zollars, Inc. AMREP Southwest May-05 UARD 5 Drainage Report for Walmart Store #3731-02, SE Corner of Montoya Rd and NM 528 Tierra West, LLC Wal-Mart Stores East, LP Mar-07 UARD 6 Drainage Report for Venada Plaza Industrial Center Tierra West, LLC Tierra West, LLC Jul-08 UARD 7 Final Drainage Study for Unnamed Arroyo, SE Corner of US 550 and NM 528 Huitt-Zollars, Inc. Joiner Construction Co., Inc. Oct-03 UARD 8 DRAFT SSCAFCA DPM, Chapter 22, Drainage, Flood Control and Erosion Control SSCAFCA SSCAFCA Jun-09 UARD 9 SSCAFCA Quality of Life Master Plan Community Sciences Corporation SSCAFCA Sep-06 UARD 10 Construction Plans Sheriffs Posse Road Box Culvert Easterling & Associates Mar-00 UARD 11 SSCAFCA Drainage Policy Amendment 2004-1 SSCAFCA SSCAFCA Mar-04 UARD 12 SSCAFCA Drainage Policy Amendment 2004-2 SSCAFCA SSCAFCA Apr-04

Note: Reference documents are available at the SSCAFCA office.

Unnamed Arroyo Watershed Management Plan C:\Documents and Settings\USER\My Documents\Unnamed Arroyo\UA_xls\report\references.xls US 550 HWY Location / Reference Map UARD 1

SPRINT BLVD NE Legend City of Rio Rancho Town of Bernalillo Sandoval County DIMAS WAY NE

P Santa Ana Pueblo IC A B Watershed Boundary - Existing Conditions O

S STANLEY ST NE T Watershed Boundary - Developed Conditions N

E SSCAFCA Boundary UARD 2 UARD X NITA PL NE Reference Document (See Opposite Page)

JEMEZ DAM

Encantado Channel

JAGER DR NE

C A KUAUA R R IA

G D E WA N

Y O FULCRUM WAY NE NE UARD 7

E HOMESTEAD LN E N C H A N T E D 1 inch = 600 feet H IL LS B L VD Feet N E NAZ 0 600300 CO N PL MONTOYA RD NE 528 HWY NE N A Z CON RD UARD 10 Unnamed Arroyo UARD 3&4 D SA Watershed Management Plan R N AL LN E D OV S UARD 5 UARD 6 S Location / Reference Map O P FS IF ER H S Feet Date: August 2009 0 590295 MRGCD 2009 AERIAL PHOTO Figure 2 of 11

Unnamed Arroyo Watershed Management Plan US 550 HWY Soils Map

SPRINT BLVD NE Legend 423 Watershed Boundary - Existing Conditions Watershed Boundary - Developed Conditions

DIMAS WAY NE 191 - Sheppard loamy fine sand, 3 to 8 percent slopes

P IC 29 - Trail loamy sand, 0 to 1 percent slopes A B O 823 - Gilco loam, 1 to 4 percent slopes, unprotected S T STANLEY ST NE N 850 - Water (Rio Grande) E

NITA PL NE

JEMEZ DAM

JAGER DR NE

Soil data obtained from the NRCS C (U.S. Department of Agriculture, A KUAUA R Natural Resources Conservation Service) R IA in June 2009.

G D

E N WA

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E 191 HOMESTEAD LN E N C H A N T E D H IL 1 inch = 600 feet LS B LV D Feet NE NAZ CO 0 600300 N PL 823

MONTOYA RD NE D 528 HWY NE N A N R R Unnamed Arroyo Z CO D E S S S Watershed Management Plan O AN P DO L LN S VA F Soils Map IF ER 823 SH 29 850 Date: August 2009 MRGCD Figure 3 of 11

Unnamed Arroyo Watershed Management Plan 5 2 5 0

5240 US 550 HWY Topography Map 5 52 2 30 2 0

SPRINT BLVD NE

5200 Legend Watershed Boundary - Existing Conditions Watershed Boundary - Developed Conditions F 5220 U L 5190 C 5275 - 5285 RUM 52 1 0 W 5180 5265 - 5275 A DIMAS WAY NE Y N P 5255 - 5265 E IC A B 5245 - 5255 O

5190 S 5235 - 5245 T

N 5190 5225 - 5235 E

5160 5215 - 5225

NITA PL NE 5205 - 5215 5160 5195 - 5205 5140 5150 5185 - 5195 5175 - 5185 0

5180

7 JAGER DR NE 1

5 5160 5165 - 5175 5130 5155 - 5165 5170 5160 5180 C A 5145 - 5155KUAUA R R IA 5135 - 5145 G E WA 5125 - 5135 Y NE 5115 - 5125 5105 - 5115 5180 HOMESTEAD LN 5095 - 5105 0 5120 513 5 5170 5085 - 5095 1 7 0 5130 E 5075 - 5085 1 inch = 600 feet N 5150 C 511 H 0 A 5065 - 5075 N T Feet E 5 5055 - 5065 D 10 5090 H 5 20 0 0 600300 IL 1 0 L 5045 - 5055 7 80 S NAZ 5 0 B C 0 1 L O 5 V N 5 D N 5039 - 5045 0 E PL 5 5070 5 50 060 MONTOYA RD NE 80 D 0 Unnamed Arroyo 528 HWY NE N R 5 A CON RD 0 Z E 5 Watershed Management Plan S S SA 5120 O ND L P O AL N Topography Map S V 5170 F IF R 50 E 6 SH 0

0 5050 7 0 5 5120 5110 5090 Date: August 2009 Figure 4 of 11 Unnamed Arroyo Watershed Management Plan - Model Parameters

Existing Conditions (EXISTING) Developed Conditions Model (DEVEX) Sub- Area Bulking Time of Storage Coefficient Initial Infiltration Sub- Area Bulking Time of Storage Initial Infiltration Notes Notes Basin (SqMi) Factor Concentration (hr) (hr) Abstraction (in) (in/hr) Basin (SqMi) Factor Concentration (hr) Coefficient (hr) Abstraction (in) (in/hr) 102 0.0198 1.12 0.089 0.077 0.35 0.83 Drains into 104 102 0.0198 1.06 0.089 0.072 0.35 0.83 Drains into 104 103 0.0134 1.18 0.096 0.103 0.35 0.83 Drains into 104 103 Only existing conditions 104 0.0415 1.16 0.169 0.162 0.36 0.85 Drains into 106 104 0.0415 1.07 0.169 0.162 0.38 0.91 Drains into 106 105 0.0172 1.06 0.130 0.107 0.35 0.83 Drains into 106 105 0.0172 1.06 0.130 0.107 0.35 0.83 Drains into 106 106 0.0165 1.14 0.209 0.188 0.35 0.83 Drains into 107 106 0.0165 1.14 0.209 0.188 0.35 0.83 Drains into 107 107 0.0259 1.10 0.125 0.110 0.36 0.87 Drains into 207 107 0.0259 1.08 0.125 0.110 0.37 0.90 Drains into 207 201 0.0460 1.10 0.208 0.177 0.35 0.83 Drains into 202 201 0.0460 1.07 0.208 0.177 0.35 0.83 Drains into 202 202 0.0292 1.11 0.099 0.086 0.35 0.83 Drains into 203 202 0.0292 1.07 0.099 0.086 0.35 0.83 Drains into 203 203 0.0145 1.08 0.220 0.183 0.35 0.83 Drains into 204 203 0.0145 1.08 0.220 0.183 0.35 0.83 Drains into 204 204 0.0084 1.06 0.161 0.131 0.35 0.83 Drains into 205 204 0.0084 1.06 0.161 0.131 0.35 0.83 Drains into 205 205 0.0376 1.07 0.122 0.107 0.41 0.99 Drains into 207 205 0.0376 1.07 0.122 0.107 0.41 0.99 Drains into 207 206 0.0207 1.06 0.156 0.128 0.35 0.83 Drains into 207 206 0.0207 1.06 0.156 0.128 0.35 0.83 Drains into 207 207 0.0261 1.17 0.142 0.172 0.54 1.37 Drains into 303 207 0.0261 1.12 0.142 0.172 0.44 1.09 Drains into 303 208 Only developed conditions 208 0.0302 1.06 0.127 0.112 0.43 1.04 Drains into 207 301 0.0132 1.06 0.093 0.077 0.35 0.83 Drains into 302 301 0.0132 1.06 0.093 0.077 0.35 0.83 Drains into 302 302 0.0485 1.07 0.186 0.159 0.38 0.93 Drains into 303 302 0.0485 1.06 0.186 0.159 0.35 0.83 Drains into 303 303 0.0330 1.14 0.128 0.147 0.53 1.35 Drains into 304 303 0.0374 1.07 0.128 0.147 0.46 1.15 Drains into 304 304 0.0112 1.11 0.122 0.139 0.56 1.42 Drains into Rio Grande 304 0.0208 1.14 0.122 0.139 0.45 1.12 Drains into Rio Grande 0.42 = TOTAL SQ MI 0.45 = TOTAL SQ MI 270 = TOTAL AC 290 = TOTAL AC

Note: The total acreage for the developed conditions model is slightly larger than for the existing conditions due to the addition of sub-basin 208 and the inclusion of a proposed water quality facility in sub-basin 304.

Note: For hydrology results (Peak flow rates and runoff volumes) please see Figure 6 and the table on the adjacent page.

Unnamed Arroyo Watershed Management Plan C:\Documents and Settings\USER\My Documents\Unnamed Arroyo\UA_xls\report\paramaters.xls 5230 52 20 Drainage Basin Map US 550 HWY 5220 5200 SPRINT BLVD NE 102 JA G Legend E R 5220 D R 5190 Watershed Boundary - Existing Conditions 5 N 21 E F 0 U L 5180 Watershed Boundary - Developed Conditions C R U M P Sub-Basin Boundary W IC 103 A A Y B Flow Arrow N O

5190 E S T STANLEY ST NE Approximate 100 Year FEMA Floodplain

5190 N E 104 5160

NITA PL NE

5160

JEMEZ DAM 5140 105 5150 Encantado Channel 106 0

5180

5 5160

107 208 5130 5170 5160 5180 C A KUAUA R R IA 201 G D

E N WA Y NE O

207 D

204 E

5170 5180 HOMESTEAD LN

E 5120 N 5170 C 205 H 5130 A 202 N 5150 T 51 E 10 D H I 5180 LL S 206 0 5090 5 5 0 1 inch = 600 feet 1 B 20 1 90 L 1 5 0 VD 7 N NAZ 5 0 E 303 C 0 5160 O 5 203 N 0 Feet 301 P 5 L 5070 5080 5 0 600300 060 MONTOYA RD NE 0 N 5 A ON R 0 D 5 Z C 304 S 528 HWY NE A 302 5120 ND LN Unnamed Arroyo O VAL 5170 Watershed Management Plan 5080 D Drainage Basin Map 0 R 5050 7 E 5060 0 S 5 S 5120 5110 O 5090 P S F IF R C E A H MIN S O MRGCD Date: August 2009 VI 5060 STA RIO 2009 AERIAL PHOTO Figure 5 of 11 Unnamed Arroyo Watershed Management Plan - Results

Software HEC-HMS Model Name UA10EX03 UA10DX03 UA10DX03 Development Scenario EXISTING DEVEX ULTIMATE Sub-Basin Q (cfs) Vol (AF) Q (cfs) Vol (AF) Q (cfs) Vol (AF) 102 58 2.3 60 3 60 3 103 34 0.9 104 172 6.4 150 9 150 9 105 46 2.6 46 2.5 46 2.5 106 95 10.3 96 12.6 96 12.6 107 117 13.2 120 16.1 120 16.1 201 75 5.8 78 6.6 78 6.6 202 105 9.2 109 10.7 109 10.7 203 126 10.9 129 12.4 129 12.4 204 140 12.2 143 13.6 143 13.6 205 185 17 189 18.4 189 18.4 206 13 3 13 3 51 3.1 207 332 34.4 404 43.9 437 44 208 76 3.9 76 3.9 301 9 9 9 302 116 8.1 118 8.5 118 8.5 303 464 44.2 580 56.4 620 56.5 304 472 44.8 605 57.5 649 57.6

Note: For hydrology model parameters, please see table adjacent to Figure 5.

Unnamed Arroyo Watershed Management Plan C:\Documents and Settings\USER\My Documents\Unnamed Arroyo\UA_xls\report\results.xls US 550 HWY Hydrology Map

SPRINT BLVD NE 102 JA Legend G E R D R Watershed Boundary - Existing Conditions N E AP_102 F UL EXISTING Q= 58cfs Watershed Boundary - Developed Conditions C DEVEX Q= 60cfs R U Sub-Basin Boundary M P W IC 103 AP_103 A A EXISTING Q= 34cfs Y B AP_104 Analysis Point DEVEX Q= 0cfs N O EXISTING Q= 172cfs

E S DEVEX Q= 150cfs T Flow Arrow STANLEY ST NE N E 104

AP_106 NITA PL NE AP_105 EXISTING Q= 95cfs EXISTING Q= 46cfs DEVEX Q= 96cfs

DEVEX Q= 46cfs JEMEZ DAM

105 106 Encantado Channel 107 208 AP_107 EXISTING Q= 117cfs KUAUA DEVEX Q= 120cfs AP_208 EXISTING Q= 0cfs 201 DEVEX Q= 76cfs D AP_201 N EXISTING Q= 75cfs O DEVEX Q= 78cfs M 207 D

204 AP_205 E EXISTING Q= 185cfs DEVEX Q= 189cfs AP_207 E EXISTING Q= 332cfs N DEVEX Q= 404cfs C H A 205 N AP_202 T EXISTING Q= 105cfs AP_204 AP_206 E EXISTING Q= 140cfs D DEVEX Q= 109cfs EXISTING Q= 13cfs DEVEX Q= 143cfs H DEVEX Q= 13cfs IL LS 206 B 202 L 203 1 inch = 600 feet VD N E 303 301 AP_303 Feet EXISTING Q= 464cfs 0 600300 DEVEX Q= 580cfs AP_203 MONTOYA RD NE N EXISTING Q= 126cfs A Z CON RD DEVEX Q= 129cfs AP_301 D EXISTING Q= 9cfs R Unnamed Arroyo 302 E DEVEX Q= 9cfs AP_302 S S EXISTING Q= 116cfs O Watershed Management Plan DEVEX Q= 118cfs P 304 FS IF Hydrology Map ER H S

C 528 HWY NE A AP_304 M EXISTING Q= 472cfs IN Date: August 2009 O V DEVEX Q= 605cfs MRGCD IST A R IO 2009 AERIAL PHOTO Figure 6 of 11 Unnamed Arroyo Watershed Management Plan - Existing Facilities Township 13 North, Range 3 East, Section 25 Township 13 North, Range 4 East, Sections 30 & 31

30_UN_01A - Example of Facility ID Coding Facility Types - Facility Type A - Natural Arroyo - Facility Number C - Channel - Watershed Designation S - Storm Drain - Section Number P - Pond E - Environmental X - Crossing Structure M - Miscellaneous

Existing Crossing Structures EXISTING Q DEVEX Q Est. Capacity Facility ID AP Name Description Notes (cfs) (cfs) (cfs) 25_UA_01X 106 NM 528 crossing @ US 550 60" CMP transitions into 48" RCP 95 96 Sufficient capacity (see Storm CAD run in Appendix D) 25_UA_02X 203 NM 528 crossing @ Enchanted Hills Blvd 4 x 36" CMP 126 129 195 30_UA_07X 303 Sheriff's Posse Rd crossing of arroyo Twin 8' x 6' concrete box culverts 464 580 860

Existing Conveyance Facilities EXISTING Q DEVEX Q Facility ID AP Name Description Notes (cfs) (cfs) 25_UA_03S 107 Joiner Pipeline 48", 60" & 66" RCP 117 120 25_UA_04C 205 Earthen channel south of Rinker Approx. trapezoidal earthen channel 185 189 Long term O@M issues Erosion from sediment starved water coming out of the 25_UA_06A 303 Unnamed Arroyo west of Sheriff's Posse Rd Sand bottom arroyo 464 580 pipe, potential avulsion 30_UA_05S 302 Inlet Venada Plaza storm drain 42" and 48" RCP 116 118 30_UA_08A 304 Unnamed Arroyo east of Sheriff's Posse Rd Sand bottom arroyo 472 605 Inadequate storm water capacity, unstable conditions

Existing Detention Facilities EXISTING Q EXISTING Q DEVEX Q in DEVEX Q out Est. Capacity Facility ID AP Name Pond Footprint Area (ac) Notes in (cfs) out (cfs) (cfs) (cfs) (AF) 25_UA_09P Pond 106 5.0 246 95 225 96 8.6 25_UA_10P Pond 201 1.4 94 75 96 78 2.4 No storm water quality controls 25_UA_11P Pond 202 1.1 118 105 124 109 2.6 No storm water quality controls 25_UA_12P Pond 203 0.6 132 126 134 129 1.0 25_UA_13P Pond 301 0.3 39 9 39 9 1.1 25_UA_15P Pond 206 0.2 51 13 51 13 1.5 Long term O@M issues

Note: All peak flows and volumes in the tables above are from the EXISTING and DEVEX conditions HEC-HMS models (see Appendix C).

Unnamed Arroyo Watershed Management Plan C:\Documents and Settings\USER\My Documents\Unnamed Arroyo\UA_xls\report\facilities.xls US 550 HWY Existing Drainage Facilities

SPRINT BLVD NE 102 Legend Watershed Boundary - Existing Conditions Watershed Boundary - Developed Conditions 102 Sub-Basin Boundary JA Section Boundary GE R DR P NE Analysis Point IC 103 25 A Sewer B S O 103

T S 104 Gas Line A T N N Storm Drain (Existing) L 104 E E Disclaimer: Y Earth Channel The studies, cost estimates and other data S T presented in this plan are conceptual, are

N Arroyo E 25_UA_09P for planning purposes only and may be 25_UA_01X 106 Pond (Existing) altered or revised based upon future JEMEZ DAM project analyses, changed circumstances NITA PL NE 105 Crossing Structure (Existing) or otherwise. Nothing herein constitutes Encantado Channel 105 any commitment by SSCAFCA or any other 106 public agency.

107 KUAUA

C 208 A 25_UA_03S R R 107

IA D 201 G 208 E N WA

Y O FULCRUM WAY NE NE

25_UA_10P M

207 D 204 E 30 201 205 E 205 25_UA_15P N 25_UA_11P C H 25_UA_04C A N T 25_UA_06A E D 202 202 206 207 H 203 1 inch = 600 feet IL LS 204 B 206 L VD 203 Feet N 30_UA_07X E 303 0 600300 301 302 303 25_UA_12P

30_UA_08A Unnamed Arroyo 25_UA_02X 304 Watershed Management Plan 25_UA_13P Existing Drainage Facilities 302 30_UA_05S 304 Lift Station

528 HWY NE Date: August 2009

MRGCD 2009 AERIAL PHOTO Figure 7 of 11 Unnamed Arroyo Watershed Management Plan - Proposed Facilities Township 13 North, Range 3 East, Section 25 Township 13 North, Range 4 East, Sections 30 & 31

Proposed Conveyance Facilities ADD. ROW DEVEX Q PROJECT ROW TOTAL Facility ID AP Name Description REQ'D (cfs) ESTIMATE ESTIMATE ESTIMATE (ACRES) 25_UA_20C 303 Unnamed Arroyo west of Sheriff's Posse Rd. Install storm drain (66" to 96", 2000' +/-) with transition to 2 - 8'x6' CBC 580 $700,000 1 $100,000 $800,000 30_UA_21C 304 Unnamed Arroyo east of Sheriff's Posse Rd. Stabilize arroyo (naturalistic with grade control drop structures 605 $700,000 - - $700,000 25_UA_22C 205 Earthen channel south of Rinker plant Install storm drain (48", 1800' +/-) 189 $300,000 unknown unknown unknown

Proposed Storm Water Quality Facilities ADD. ROW SWQ DEVEX Q in DEVEX Q PROJECT ROW TOTAL Facility ID AP Name Description REQ'D Volume (AF) (cfs) out (cfs) ESTIMATE ESTIMATE ESTIMATE (ACRES) 25_UA_16E Pond 106 0 225 96 Install trash removal structure $100,000 - - $100,000 25_UA_17E Pond 202 0 124 109 30_UA_19E Water quality facility downstream of Sheriff's Posse Rd 5 $1,000,000 4.5 $900,000 $1,900,000

Proposed Pond Improvements ADD. ROW SWQ DEVEX Q in DEVEX Q PROJECT ROW TOTAL Facility ID AP Name Description REQ'D Volume (AF) (cfs) out (cfs) ESTIMATE ESTIMATE ESTIMATE (ACRES) 25_UA_23P Pond 206 Abandon pond 0 51 13* N/A - - N/A

Proposed Miscellaneous Improvements ADD. ROW PROJECT ROW TOTAL Facility ID AP Name Description REQ'D ESTIMATE ESTIMATE ESTIMATE (ACRES) 30_UA_24M Nazcon Road near arroyo at Sheriff's Posse Rd Raise road, address street drainage $100,000 - - $100,000 30_UA_25M Sewerline east of Sheriff's Posse Rd Reroute sewerline N/A - - N/A 30_UA_26M Outfall of arroyo at the river Outfall structure (naturalistic with concrete boulders, scour protection) $600,000 - - $600,000

* If pond 206 is abandoned as recommended, basin 206 will discharge an additional 38 cfs to the Unnamed Arroyo. The conveyance facilities downstream (25_UA_20C and 30_UA_21C) will have to be designed accordingly (please see ULTIMATE conditions model in Appendix C).

Unnamed Arroyo Watershed Management Plan C:\Documents and Settings\USER\My Documents\Unnamed Arroyo\UA_xls\report\facilities.xls US 550 HWY Proposed Drainage Facilities

SPRINT BLVD NE 102 Legend Watershed Boundary - Existing Conditions 102 Watershed Boundary - Developed Conditions

JA Sub-Basin Boundary GE R DR P NE Section Boundary IC 103 A B Analysis Point O 103 Disclaimer:

S 104 The studies, cost estimates and other data STANLEY ST NE T Stabilized Arroyo (Naturalistic)

N 104 presented in this plan are conceptual, are E Storm Drain Pipe for planning purposes only and may be altered or revised based upon future Water Quality Facility project analyses, changed circumstances NITA PL NE 25_UA_16E Abandon Pond or otherwise. Nothing herein constitutes 106 any commitment by SSCAFCA or any

JEMEZ DAM 105 Misc Improvements other public agency. Encantado Channel 105 106 208 107 KUAUA

25 107 D 201 208 N

FULCRUM WAY NE O

207 D

204 E

201 205 HOMESTEAD LN E 205 N 30 C H 25_UA_17E 25_UA_22C A 25_UA_20C N 206 T E 207 D 202 25_UA_23P H 203 I 1 inch = 600 feet L 204 LS 202 B 206 LV D NE 303 Feet 203 301 304 0 600300 301 302 30_UA_25M 303 MONTOYA RD NE N A ZCON RD 30_UA_21C Unnamed Arroyo 302 Watershed Management Plan 30_UA_24M Proposed Drainage Facilities D 30_UA_26M 528 HWY NE R 30_UA_19E SE S O P 304 S F IF R E Date: August 2009

H MRGCD S 2009 AERIAL PHOTO Figure 8 of 11

Unnamed Arroyo Watershed Management Plan US 550 HWY Property / Right of Way

SPRINT BLVD NE Legend Watershed Boundary - Existing Conditions

DIMAS WAY NE Watershed Boundary - Developed Conditions

P IC SSCAFCA Easement A B O Town of Bernalillo Drainage Easement - Obtain SSCAFCA Easement S 4.17 Ac. T S A T Public Road ROW N N L E E Y Water Quality ROW

S T Additional ROW to be Obtained when Platted N E NITA PL NE Research Underlying Ownership, Convert to Public ROW

JEMEZ DAM

Encantado Channel

JAGER DR NE

C A KUAUA R 2.17 Ac. R IA

G D E WA N

Y O FULCRUM WAY NE NE

E 5.69 Ac. HOMESTEAD LN N C H A N T E D H 2.89 Ac. 4.04 Ac. IL 1.04 Ac. LS B 1 inch = 600 feet LV D NE NAZ CO Feet N 2.38 Ac. PL 0 600300 N MONTOYA RD NE A Z N RD D 528 HWY NE C O R E S S A Unnamed Arroyo S ND LN O O VAL P 1.16 Ac. 2.98 Ac. Watershed Management Plan FS IF 1.19 Ac. ER Property / Right of Way SH

2.01 Ac. 0.93 Ac.

C A M INO Date: August 2009 VI ST MRGCD A R IO 2009 AERIAL PHOTO Figure 9 of 11

Unnamed Arroyo Watershed Management Plan US 550 HWY Potential Watershed Park Components SPRINT BLVD NE Legend Watershed Boundary - Existing Conditions

DIMAS WAY NE Watershed Boundary - Developed Conditions P IC Existing Trail A B O S Walking / Bike Trail (Proposed) T S A T

N N Wildlife Corridor (Proposed) L E E Y

S Water Quality Facility / Multi-Use Area (Proposed Roadway Site) T

N E NITA PL NE

JEMEZ DAM

Encantado Channel

JAGER DR NE

C A KUAUA R R IA

G D

E N WA

Y O FULCRUM WAY NE NE

E HOMESTEAD LN N C H A N T E D H IL 1 inch = 600 feet LS B LV D NE Feet NAZ CO 0 600300 N PL MONTOYA RD NE N D 528 HWY NE A ON RD Z C R E Unnamed Arroyo S S S AN O D O AL LN Watershed Management Plan P V S F IF Watershed Park Components ER SH

C A M IN O Date: August 2009

VIS TA R MRGCD IO 2009 AERIAL PHOTO Figure 10 of 11

Unnamed Arroyo Watershed Management Plan U N Storm Water Quality N 550 A & Watershed Park M E Habitat Enhancement D Habitat Enhancement

A R R SHERIFF'S POSSE ROAD O Y O

Low Flow Arroyo Interpretive Elements Diversion Meander Control Bat Houses Conveyance Bird Migration Mileposts Raptor Roosts SANDOVAL LN Track Decoding Stones Trails Micro Habitats Rundown &

Overview Ramp

E E

Return D

Flow Privacy Wall D

Conveyance N A Water Quality A

Water Quality R

Inlet/Outlet "Dry" Extended R G

Structures Detention Pond G

O Optional Water O

I Quality Site I

R R Unnamed Arroyo Watershed Management Plan C A M Storm Water Quality IN O VISTA RIO & Watershed Park Habitat Enhancement

NOTE: For additional information 0 50 100 150 200 Date: AUGUST, 2009 refer to Appendix B Feet Figure 11 of 11 MapDocument: (J:\SSCAFCA\277262 unnamed arroyo\GIS\UA-SWQ1.mxd) AM 8/17/2009-- 10:54:35 2008 AERIAL PHOTO APPENDIX B – WATERSHED PARK AMENITIES, HABITAT ENHANCEMENT, AND ENVIRONMENTAL ART

APPENDIX ‘B’ facilities address all these components. Design of the facilities is proposed to include input WATERSHED PARK AMENITITES, HABITAT ENHACEMENT, AND ENVIRONMENTAL ART from and collaboration with Ms Hull to implement her concepts with the flood control functions AS FLOOD CONTROL and could also include consultation with ornithologists, botanists and biologists to identify

important local and native species to guide the habitat enhancement implementation. The Unnamed Arroyo Watershed Plan integrates several elements to improve quality of life, add community value and provide Watershed Park amenities. These are summarized on Figure 11 in Appendix ‘A’ and include trails and paths, educational signage, wildlife and human habitat • Mitigation Aspects enhancement and environmental art concepts integrated into the flood control function. The proposed storm water quality pond and linear arroyo wildlife corridor habitat enhancements mitigate some of the impact of local development on native species by • Environmental Art as Flood Control - the Concept restoring and preserving open space areas amenable to restoration. Proposed mitigation The Watershed Plan takes the multiple use and Watershed Park concepts to the “next measures are intended to address potential USACOE 404 Permit conditions and are generation”. The objective is to increase community value by incorporating artist designs and incorporated into all the watershed park components. wildlife habitat enhancement into the functional SSCAFCA flood control facilities. To accomplish this, an environmental artist joined the project team to provide concepts and ideas • Water Quality Inlet and Outlet Structures from a fresh perspective. This is intended to be an extension or upgrade of previous multiple The inlet and outlet structures to the uses integrated into flood control projects such as using access ramps as trails, playing fields water quality pond function to dissipate as detention basins, the “rock garden” energy dissipater at Sunset Pond, naturalistic the energy of the flow and collect debris stabilization, educational signage, open space, etc. and gross pollutants. Typically, these are concrete structures with debris fences, • Criteria and Intent. screens, baffles, etc. For the Unnamed The intent is to integrate artistic concepts and wildlife Arroyo, the concept is to provide these habitat artworks into the flood control, water quality structural functions designed as an and habitat restoration functions of the facilities ‘inverted arroyo’. This is accomplished without significantly increasing the cost, thereby using wavy non-uniform alignments with increasing overall community value. variable colored and textured walls Debris Structure Inlet and Outlet Concepts representing the arroyo wall. Habitat • Environmental Artist. enhancements include earth filled boxes spanning the walls with openings below the box Representatives of THE LAND/an art site and the functioning as flow control, ports on the sides for burrowing animals and vegetative habitat on Contemporary Art Society aided in the selection of an the top. appropriate environmental/land artist. Lynne Hull, an environmental artist with local, national and • Storm Water Quality Extended Detention Pond Habitat. international environmental art installations, joined the The proposed storm water quality pond will not support typical wetland plants but will provide project team and provided concepts and guidance that riparian conditions with native plants ranging from cottonwood trees to grasses and forbs. have been integrated into the Watershed Plan. She These plants provide cover and forage for the entire range of local wildlife. Artificial habitat and also provided examples of interpretive art elements environmental art enhancements supplement the native plantings. Access ramps for that could be used for educational and ecological maintenance also function as trails. awareness purposes. Examples of “Migration Mileposts”, One of Ms. Hull’s underlying principles is that habitat documenting birds which come • Arroyo Meander Control enhancement should be all encompassing - including through a place on migration, how far The proposed naturalistic treatment of the arroyo is to provide long term stability and minimize vegetation, wildlife, domestic animals, artworks and they have come and how far they will maintenance using grade control structures to provide a meandering alignment and prevent go, and names of other communities humans. The concepts integrated into the proposed vertical and horizontal erosion. The grade controls would be mostly buried with minimal visual they have passed through. impact and designed to convey the “clean water” runoff without erosion. Micro-habitat areas for envisioned as a walled structure with ports filled with earth to provide artificial burrowing both native vegetation and wildlife forage are incorporated into these structures. Interpretive habitat for birds, small mammals and reptiles. educational elements for both flood control and wildlife habitat are also incorporated into these structures. • Interpretive Elements These consist of small functional components integrating artistic design with artificial wildlife support and shelter such as raptor roosts, bat houses, interpretive educational signage, track decoder stones, bird migration mileposts, micro habitats, etc. Human habitat is enhanced by constructing these as art objects which engage humans in the wider species community. Some examples are shown on Figure 11 in Appendix ‘A’ and in the samples in this Appendix.

Another concept to tie water resources education to the local flora and fauna is a hand pump discharging into an artistic “trough” with dog water bowls, outlets with energy dissipation, wildlife watering sumps, etc. This would require a well, cistern, or other means of supplying water. An example is shown below. Samples of “track decoder” stones to be arranged along arroyo rim to identify • Trails Interactive hand pump and water resource tracks seen in the sand at bottom of arroyo

Trails and paths are proposed along the Unnamed Arroyo from the Rio Grande up to the education tool for the community. Hand pump and existing trail in the commercial development west of NM 528, along the proposed storm drain sluice from “East Drake Pondworks”, public art alignment south of the Rinker Plant and along Sheriff’s Posse Rd., all shown on Figure 10 in project in Fort Collins, CO. Note side basins marked Appendix ‘A’. for different species. Hidden pipes send water down Between the Rio Grande and Sheriff’s Posse Rd. the path would be along the arroyo into drinking basins at different heights. meandering with the arroyo with pockets of native plantings providing wildlife habitat, a bio swale using the trickle outflow from the water quality pond and human scale educational and trail amenities. Between Sheriff’s Posse Rd. and NM 528, the trail/path would be on top of the storm drain landscaped with native plants providing human and wildlife habitat. West of NM 528, the paths would conform to City of Rio Rancho urban path standards.

• Rundown and Overview Ramp. At the Rio Grande, the arroyo is perched 6’ to 10’ above the normal river flow elevation (current 2009 conditions). A rundown is proposed to dissipate the energy of the arroyo flow, prevent head-cutting up the arroyo and prevent local erosion at the arroyo entrance. This rundown is envisioned as a naturalistic concreted boulder apron or similar mimicking the artistic concept of the overview ramp and water quality structures. An overview ramp is proposed as a wildlife viewing location and wildlife educational opportunity at the terminus of the trail along Unnamed Arroyo. The ramp would be integrated into the rundown as one structure following the “inverted Examples of “track decoder” arroyo” concept. The construction is stones to be arranges along arroyo rim to identify tracks seen in the sand at the bottom of the arroyo.

Lynne Hull Lynne Hull Artist Statement 2009 Artist Bio: My sculpture and installations provide shelter, Colorado artist Lynne Hull has pioneered “trans-species” art, food, water or space for wildlife, as eco- creating sculpture installations as wildlife habitat atonement for their loss of habitat to human enhancement, eco-atonement for human impact. She works encroachment. My current projects link from the belief that artist creativity can be effectively applied communities from Canada to South America to the urgent situations we face today. through our shared wildlife. Some raise

human awareness of our trans-species Lynne has worked in the American West with a variety of wildlife agencies including state relationship and harmonious ways to live that wildlife departments, the Forest Service, the Bureau of Land Management, and National Park relationship in the landscape. While assisting Service. She has worked in 14 states and 8 countries, with a wide variety of wildlife agencies wildlife, when possible projects are also and communities. In 2007 she was named “national artist of the year” by the Arts and Healing designed with components of sustainable Network. In 1998 she worked in Yucatan and Chiapas, Mexico with environmental NGO economic development for humans. Research and consultation are essential to project Pronatura. In 1993-94 she realized three projects in the U.K. courtesy of a special Fulbright success. I prefer direct collaboration with wildlife specialists, environmental interpreters, Fellowship and one in Kenya on a Lila Wallace/Reader’s Digest Foundation/Arts International landscape architects, and local people for design integration. Most artworks function in the Residency. Currently she is working on “3 Artistas”, a tri-national collaboration with artists from temporal gap between the time reclamation of damaged sites begins and the time nature Colombia and Mexico, “Migration Mileposts”, linking communities in the hemisphere who recovers. share migratory birds, and she recently completed “East Drake Pondworks”, a major Art in Public Places for the city of Fort Collins, CO where she lives. I believe that the creativity of artists can be applied to real world problems and can have an effect on urgent social and environmental issues. I am increasingly aware that the greatest Her client list includes hawks, eagles, pine challenge faced by other species is the need for change in human values and attitudes toward martin, osprey, owls, spider monkeys, salmon, conflicting rights, wants, and needs. I hope my work offers models for equitable solutions. butterflies, bees, frogs, toads, newts, bats, beaver, songbirds, otter, rock hyrax, small For images of Lynne Hull artwork please consult www.eco-art.org, www.greenmuseum.org, desert species, waterfowl and occasional www.artsheals.org, www.ecoartnetwork.org humans.

25’ tall “Batbeast” Bat House Sculpture

Examples of “Raptor Roosts”, safe roosting and nesting sculptures for hawks, eagles and owls. A dead tree on the site may be recycled for use as a roost.

APPENDIX C – HYDROLOGY

1. DRAINAGE BASIN MAP

2. EXISTING CONDITIONS

A. Additional Criteria and Assumptions (see also Section II. B of the report): • The 8” PVC pipe diverting flows (maximum flow rate 2.8 cubic feet per second) from the parking lot in basin 102 to the Venada Arroyo was not modeled due to the negligible influence on downstream hydrographs. • Storm drains in sub-basins 104 and 201 were not modeled because they only minimally influence the hydrograph due their short lengths. • Storage-discharge curves for ponds 106, 201 and 206 were adopted from existing reports (UARD 2 & 7). • Storage-discharge curves for ponds 202 and 203 were determined by field investigation. • Pond 302 and the storm drain connecting it to pond 206 were not included in the hydrologic models due to plans of removing them as part of the ongoing development of basin 302 (UARD 6). • The discharge from pond 301 was assumed to not exceed 9.2 cfs.

B. HEC-HMS MODEL INPUT PARAMETERS – EXISTING CONDITIONS

Sub-Basin Areas Bulking Factors HEC-HMS Initial and Constant Loss Parameters HEC-HMS Transform Parameters Sub-Basin Area Area Area Initial Abstraction Infiltration Impervious Time of Concentration Storage Coefficient ft2 acres mi2 (in) (in/hr) % (hrs) 102 551501 13 0.0198 1.12 0.35 0.83 50.3 0.089 0.077 103 374478 9 0.0134 1.18 0.35 0.83 0.0 0.096 0.103 104 1157525 27 0.0415 1.16 0.36 0.85 12.0 0.169 0.162 105 479376 11 0.0172 1.06 0.35 0.83 85.8 0.130 0.107 106 459194 11 0.0165 1.14 0.35 0.83 33.0 0.209 0.188 107 721974 17 0.0259 1.10 0.36 0.87 50.0 0.125 0.110 201 1283337 29 0.0460 1.10 0.35 0.83 60.4 0.208 0.177 202 812670 19 0.0292 1.11 0.35 0.83 51.2 0.099 0.086 203 403953 9 0.0145 1.08 0.35 0.83 73.8 0.220 0.183 204 235490 5 0.0084 1.06 0.35 0.83 90.0 0.161 0.131 205 1049190 24 0.0376 1.07 0.41 0.99 67.0 0.122 0.107 206 575762 13 0.0207 1.06 0.35 0.83 85.0 0.156 0.128 207 726614 17 0.0261 1.17 0.54 1.37 3.1 0.142 0.172 301 368558 8 0.0132 1.06 0.35 0.83 85.2 0.093 0.077 302 1352333 31 0.0485 1.07 0.38 0.93 77.1 0.186 0.159 303 920598 21 0.0330 1.14 0.53 1.35 9.1 0.128 0.147 304 313277 7 0.0112 1.11 0.56 1.42 12.0 0.122 0.139 Total 11785830 271 0.4228

C. EXISTING CONDITIONS HEC-HMS MODEL - BASIN MODEL OVERVIEW

D. EXISTING CONDITIONS HEC-HMS MODEL – GLOBAL SUMMARY

3. DEVEX CONDITIONS

A. Additional Criteria and Assumptions (see also Section II. B of the report): • Sub-basin 103, which drains into the Unnamed Arroyo under existing conditions, was assumed to drain to the Venada Arroyo under developed conditions (UARD 2). • Sub-basin 208, which does not drain into the Unnamed Arroyo under existing conditions, was assumed to be part of the watershed under developed conditions. • Sub-basin 304 was assumed to extend further to the south in the developed conditions model due to a proposed water quality facility. • NOTE: The removal of pond 206 (25_UA_15P, see Figure 7 in Appendix ‘A’) would lead to increased flows of approximately 40 cfs from basin 206 into the Unnamed Arroyo. It is recommended to design the downstream conveyance facilities (25_UA_20C and 30_UA_21C) accordingly to accommodate the increased flows.

B. HEC-HMS Model Input Parameters –DEVEX Conditions

Sub-Basin Areas Bulking Factors HEC-HMS Initial and Constant Loss Parameters HEC-HMS Transform Parameters Sub-Basin Area Area Area Initial Abstraction Infiltration Impervious Time of Concentration Storage Coefficient ft2 acres mi2 (in) (in/hr) % (hrs) (hrs) 102 551501 13 0.0198 1.06 0.35 0.83 89 0.089 0.072 104 1157525 27 0.0415 1.07 0.38 0.91 80 0.169 0.162 105 479376 11 0.0172 1.06 0.35 0.83 85 0.130 0.107 106 459194 11 0.0165 1.14 0.35 0.83 33 0.209 0.188 107 721974 17 0.0259 1.08 0.37 0.90 70 0.125 0.110 201 1283337 29 0.0460 1.07 0.35 0.83 80 0.208 0.177 202 812670 19 0.0292 1.07 0.35 0.83 78 0.099 0.086 203 403953 9 0.0145 1.08 0.35 0.83 74 0.220 0.183 204 235490 5 0.0084 1.06 0.35 0.83 90 0.161 0.131 205 1049190 24 0.0376 1.07 0.41 0.99 67 0.122 0.107 206 575762 13 0.0207 1.06 0.35 0.83 85 0.156 0.128 207 726566 17 0.0261 1.12 0.44 1.09 37 0.142 0.172 208 841137 19 0.0302 1.06 0.43 1.04 70 0.127 0.112 301 368558 8 0.0132 1.06 0.35 0.83 85 0.093 0.077 302 1352333 31 0.0485 1.06 0.35 0.83 85 0.186 0.159 303 1042767 24 0.0374 1.07 0.46 1.15 51 0.128 0.147 304 581200 13 0.0208 1.14 0.45 1.12 6 0.122 0.139 Total 12642533 290 0.4535

C. DEVEX CONDITIONS HEC-HMS MODEL – BASIN MODEL OVERVIEW

D. DEVEX CONDITIONS HEC-HMS MODEL – GLOBAL SUMMARY

4. ULTIMATE CONDITIONS

A. Additional Criteria and Assumptions (see also Section II. B of the report): • Sub-basin 103, which drains into the Unnamed Arroyo under existing conditions, was assumed to drain to the Venada Arroyo under ultimate conditions (UARD 2). • Sub-basin 208, which does not drain into the Unnamed Arroyo under existing conditions, was assumed to be part of the watershed under ultimate conditions. • Sub-basin 304 was assumed to extend further to the south in the ultimate conditions model due to a proposed water quality facility. • NOTE: The removal of pond 206 (25_UA_15P, see Figure 7 in Appendix ‘A’) would lead to increased flows of approximately 40 cfs from basin 206 into the Unnamed Arroyo. It is recommended to design the downstream conveyance facilities (25_UA_20C and 30_UA_21C) accordingly to accommodate the increased flows.

B. HEC-HMS Model Input Parameters –ULTIMATE Conditions

Sub-Basin Areas Bulking Factors HEC-HMS Initial and Constant Loss Parameters HEC-HMS Transform Parameters Sub-Basin Area Area Area Initial Abstraction Infiltration Impervious Time of Concentration Storage Coefficient ft2 acres mi2 (in) (in/hr) % (hrs) (hrs) 102 551501 13 0.0198 1.06 0.35 0.83 89 0.089 0.072 104 1157525 27 0.0415 1.07 0.38 0.91 80 0.169 0.162 105 479376 11 0.0172 1.06 0.35 0.83 85 0.130 0.107 106 459194 11 0.0165 1.14 0.35 0.83 33 0.209 0.188 107 721974 17 0.0259 1.08 0.37 0.90 70 0.125 0.110 201 1283337 29 0.0460 1.07 0.35 0.83 80 0.208 0.177 202 812670 19 0.0292 1.07 0.35 0.83 78 0.099 0.086 203 403953 9 0.0145 1.08 0.35 0.83 74 0.220 0.183 204 235490 5 0.0084 1.06 0.35 0.83 90 0.161 0.131 205 1049190 24 0.0376 1.07 0.41 0.99 67 0.122 0.107 206 575762 13 0.0207 1.06 0.35 0.83 85 0.156 0.128 207 726566 17 0.0261 1.12 0.44 1.09 37 0.142 0.172 208 841137 19 0.0302 1.06 0.43 1.04 70 0.127 0.112 301 368558 8 0.0132 1.06 0.35 0.83 85 0.093 0.077 302 1352333 31 0.0485 1.06 0.35 0.83 85 0.186 0.159 303 1042767 24 0.0374 1.07 0.46 1.15 51 0.128 0.147 304 581200 13 0.0208 1.14 0.45 1.12 6 0.122 0.139 Total 12642533 290 0.4535

C. ULTIMATE CONDITIONS HEC-HMS MODEL – BASIN MODEL OVERVIEW

D. ULTIMATE CONDITIONS HEC-HMS MODEL – GLOBAL SUMMARY

APPENDIX D – CALCULATIONS

Unnamed Arroyo Watershed Management Plan - Comparison of AHYMO and HEC-HMS Peak Flow Rates and Runoff Volumes for Selected Analysis Points

Model UA10EX03 Model UA10DX03 Existing Conditions (EXISTING) Developed Conditions Existing Facilities (DEVEX) HEC-HMS Model HEC-HMS Model Analysis Analysis AHYMO Results Results Comparison AHYMO Results Results Comparison Point Notes Point Notes Vol Vol Vol Vol Δ Q Δ Q Q (cfs) (AF) Q (cfs) (AF) Δ Vol Q (cfs) (AF) Q (cfs) (AF) Δ Vol 101 101 102 52 2.2 58 2.3 -11% -5% Drains into 104 102 56 2.8 60 3 -7% -7% Drains into 104 Only existing 103 30 0.9 34 0.9 -12% -2% Drains into 104 103 conditions 104 165 6.2 172 6.4 -4% -3% Drains into 106 104 159 8.2 150 9 5% -10% Drains into 106 105 49 2.4 46 2.6 5% -8% Drains into 106 105 48 2.3 46 2.5 4% -9% Drains into 106 106 85 9.8 95 10.3 -11% -5% Drains into 107 106 87 11.8 96 12.6 -10% -7% Drains into 107 107 105 12.6 117 13.2 -11% -5% Drains into 207 107 110 15.0 120 16.1 -10% -7% Drains into 207 201 74 5.4 75 5.8 -2% -7% Drains into 202 201 79 6.1 78 6.6 0% -8% Drains into 202 202 101 8.6 105 9.2 -4% -7% Drains into 203 202 105 9.9 109 10.7 -3% -8% Drains into 203 203 120 10.2 126 10.9 -5% -7% Drains into 204 203 124 11.4 129 12.4 -4% -9% Drains into 204 204 132 11.4 140 12.2 -6% -7% Drains into 205 204 136 12.6 143 13.6 -5% -8% Drains into 205 205 171 15.8 185 17 -8% -8% Drains into 207 205 177 17.1 189 18.4 -7% -8% Drains into 207 206 13 2.7 13 3 -3% -11% Drains into 207 206 13 2.7 13 3 -3% -11% Drains into 207 207 302 32.3 332 34.4 -10% -7% Drains into 303 207 384 41.4 404 43.9 -5% -6% Drains into 303 208 Only developed conditions 208 86 4.2 76 3.9 12% 7% Drains into 207 301 9 9 Drains into 302 301 9 9 Drains into 302 302 121 7.5 116 8.1 4% -8% Drains into 303 302 125 7.8 118 8.5 6% -9% Drains into 303 303 433 41.4 464 44.2 -7% -7% Drains into 304 303 579 52.9 580 56.4 0% -7% Drains into 304 Drains into Rio 304 445 41.9 472 44.8 -6% -7% Drains into Rio Grande 304 609 54.1 605 57.5 1% -6% Grande